/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --c-bg: #081120;
  --c-bg-2: #0D1F3C;
  --c-primary: #0B1B33;
  --c-accent: #27C8D8;
  --c-accent-2: #3B82F6;
  --c-text: #EAF2FF;
  --c-text-2: #9DB1CC;
  --c-text-3: #5D7290;
  --c-disabled: #3D4E68;
  --c-border: rgba(120, 170, 255, 0.12);
  --c-border-hover: rgba(39, 200, 216, 0.5);
  --c-glass: rgba(16, 38, 68, 0.6);
  --c-glass-2: rgba(5, 12, 24, 0.8);
  --c-success: #34D399;
  --r-lg: 16px;
  --r-md: 12px;
  --r-sm: 8px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3), inset 0 0 0 1px rgba(255,255,255,0.04);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.45), 0 0 0 1px rgba(39,200,216,0.25);
  --glow: 0 0 24px rgba(39,200,216,0.3);
  --glow-btn: 0 4px 20px rgba(39,200,216,0.4);
  --glow-btn-hover: 0 8px 32px rgba(39,200,216,0.55);
  --space: 24px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "HarmonicOS Sans SC", sans-serif;
  --font-num: "DIN Alternate", "Bahnschrift", "Arial", sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }
input, textarea { font-family: inherit; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 80px 0; }
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.3; }

/* ===== 顶部公告栏 ===== */
.topbar {
  height: 36px;
  background: rgba(5, 12, 24, 0.9);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 13px;
  color: var(--c-text-2);
  display: flex;
  align-items: center;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}
.topbar-left svg {
  width: 14px;
  height: 14px;
  color: var(--c-accent);
}
.topbar-right {
  color: var(--c-text-3);
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* ===== 主导航 ===== */
.main-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 72px;
  background: rgba(8, 17, 32, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.3);
  box-shadow: 0 0 18px rgba(39, 200, 216, 0.15);
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo-main {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--c-text);
}
.logo-sub {
  font-size: 11px;
  color: var(--c-text-3);
  letter-spacing: 0.15em;
  margin-top: 2px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: var(--r-sm);
  transition: color 0.25s, background 0.25s;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--c-accent);
  box-shadow: var(--glow);
  transition: width 0.3s ease;
}
.nav-link:hover {
  color: var(--c-text);
}
.nav-link:hover::after {
  width: 70%;
}
.nav-link.active {
  color: var(--c-text);
}
.nav-link.active::after {
  width: 70%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2));
  color: #061226;
  box-shadow: var(--glow-btn);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-btn-hover);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 12px rgba(39,200,216,0.3);
}
.btn-outline {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--c-text);
}
.btn-outline:hover {
  background: rgba(39, 200, 216, 0.12);
  border-color: var(--c-border-hover);
  color: var(--c-text);
}
.nav-cta {
  margin-left: 8px;
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  border: 1px solid var(--c-border);
  background: rgba(255, 255, 255, 0.04);
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-text);
  margin: 3px 0;
  border-radius: 2px;
  transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ===== 移动端菜单 ===== */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(5, 12, 24, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}
.mobile-menu a {
  font-size: 22px;
  font-weight: 600;
  color: var(--c-text-2);
  padding: 14px 32px;
  border-radius: var(--r-sm);
  transition: all 0.25s;
}
.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--c-text);
  background: rgba(39, 200, 216, 0.12);
}
.mobile-menu .btn {
  margin-top: 16px;
  font-size: 16px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: calc(100vh - 36px);
  min-height: 720px;
  display: flex;
  align-items: center;
  padding: 80px 0;
  overflow: hidden;
  background:
    radial-gradient(ellipse 55% 50% at 75% 25%, rgba(59, 130, 246, 0.18), transparent 70%),
    radial-gradient(ellipse 40% 45% at 20% 75%, rgba(39, 200, 216, 0.10), transparent 65%),
    linear-gradient(180deg, rgba(8, 17, 32, 0.6) 0%, rgba(8, 17, 32, 0.95) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(39, 200, 216, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(39, 200, 216, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  z-index: 1;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 85%, rgba(39, 200, 216, 0.08) 0, transparent 40%),
    radial-gradient(circle at 88% 15%, rgba(59, 130, 246, 0.08) 0, transparent 45%);
  z-index: 1;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 60px;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.hero-left {
  flex: 1;
  min-width: 0;
}
.hero-left h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-text);
  text-shadow: 0 0 24px rgba(39, 200, 216, 0.15);
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-2);
  max-width: 460px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  gap: 36px;
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat .num {
  font-family: var(--font-num);
  font-size: 28px;
  font-weight: 700;
  color: var(--c-accent);
  text-shadow: 0 0 12px rgba(39, 200, 216, 0.3);
}
.stat .label {
  font-size: 12px;
  color: var(--c-text-3);
  margin-top: 4px;
}
.hero-right {
  width: 420px;
  flex-shrink: 0;
}
.hero-card {
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-card), var(--glow);
}
.hero-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.hero-status {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 16px;
  background: rgba(5, 12, 24, 0.75);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-text);
}
.hero-status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ===== 快捷入口 ===== */
.quick-links {
  padding: 32px 0;
  background: rgba(13, 31, 60, 0.5);
  border-bottom: 1px solid var(--c-border);
}
.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.quick-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--r-md);
  background: rgba(16, 38, 68, 0.5);
  border: 1px solid var(--c-border);
  transition: all 0.3s ease;
}
.quick-item:hover {
  background: rgba(16, 38, 68, 0.8);
  border-color: var(--c-border-hover);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}
.quick-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent);
  flex-shrink: 0;
}
.quick-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.quick-desc {
  font-size: 12px;
  color: var(--c-text-3);
  margin-top: 2px;
}
.quick-arrow {
  margin-left: auto;
  color: var(--c-text-3);
  transition: color 0.25s, transform 0.25s;
  flex-shrink: 0;
}
.quick-item:hover .quick-arrow {
  color: var(--c-accent);
  transform: translateX(3px);
}

/* ===== 板块通用 ===== */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.section-head h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-text);
}
.section-en {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--c-text-3);
  text-transform: uppercase;
}
.section-more {
  margin-left: auto;
  font-size: 14px;
  color: var(--c-text-2);
  transition: color 0.25s, transform 0.25s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.section-more:hover {
  color: var(--c-accent);
  transform: translateX(3px);
}

/* ===== 最新信息列表 ===== */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.news-card {
  display: flex;
  gap: 20px;
  padding: 20px;
  border-radius: var(--r-lg);
  background: var(--c-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}
.news-card:hover {
  border-color: var(--c-border-hover);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.news-thumb {
  width: 160px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
}
.news-thumb img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}
.news-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.news-body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.25s;
}
.news-card:hover .news-body h3 {
  color: var(--c-accent);
}
.news-body p {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}
.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  flex-wrap: wrap;
}
.tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  background: rgba(39, 200, 216, 0.12);
  border: 1px solid rgba(39, 200, 216, 0.25);
  color: var(--c-accent);
}
.date {
  font-size: 12px;
  color: var(--c-text-3);
}
.news-more {
  margin-left: auto;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-2);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.25s, transform 0.25s;
}
.news-more:hover {
  color: var(--c-accent);
  transform: translateX(3px);
}
.empty-state {
  padding: 60px 20px;
  text-align: center;
  border-radius: var(--r-lg);
  background: var(--c-glass);
  border: 1px dashed var(--c-border);
  color: var(--c-text-3);
  font-size: 15px;
}
.empty-state .empty-icon {
  font-size: 40px;
  margin-bottom: 12px;
  color: var(--c-text-3);
}

/* ===== 核心特性 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
}
.feature-card {
  border-radius: var(--r-lg);
  padding: 32px;
  background: var(--c-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-border-hover);
  box-shadow: var(--shadow-hover);
}
.feature-main {
  background: linear-gradient(145deg, rgba(16, 38, 68, 0.7), rgba(11, 27, 51, 0.5));
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(39, 200, 216, 0.12);
  border: 1px solid rgba(39, 200, 216, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent);
  margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 12px;
}
.feature-card p {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.75;
  margin-bottom: 20px;
}
.feature-link {
  margin-top: auto;
  font-size: 14px;
  color: var(--c-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: transform 0.25s, color 0.25s;
}
.feature-link:hover {
  transform: translateX(4px);
  color: var(--c-text);
}
.feature-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.feature-sm {
  flex: 1;
  padding: 24px;
}
.feature-sm h3 {
  font-size: 17px;
}
.feature-sm p {
  font-size: 13px;
  margin-bottom: 14px;
}

/* ===== 数据指标带 ===== */
.stats-band {
  padding: 60px 0;
  background: linear-gradient(90deg, rgba(13, 31, 60, 0.8), rgba(8, 17, 32, 0.9));
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.stat-item {
  text-align: center;
  padding: 20px 10px;
  position: relative;
}
.stat-item::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 50px;
  width: 1px;
  background: rgba(120, 170, 255, 0.12);
}
.stat-item:last-child::after { display: none; }
.stat-item .num {
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 700;
  color: var(--c-accent);
  text-shadow: 0 0 20px rgba(39, 200, 216, 0.25);
  display: block;
  margin-bottom: 6px;
}
.stat-item .label {
  font-size: 13px;
  color: var(--c-text-3);
}

/* ===== 分类导览 ===== */
.cat-guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.cat-guide-card {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  min-height: 280px;
  display: block;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  transition: all 0.35s ease;
}
.cat-guide-card:hover {
  border-color: var(--c-border-hover);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.cat-guide-card img {
  width: 100%;
  height: 100%;
  min-height: 280px;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.cat-guide-card:hover img {
  transform: scale(1.03);
}
.cat-guide-body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 24px;
  background: linear-gradient(0deg, rgba(5, 12, 24, 0.95) 0%, rgba(5, 12, 24, 0.5) 70%, transparent);
}
.cat-guide-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 6px;
}
.cat-guide-desc {
  font-size: 13px;
  color: var(--c-text-2);
}

/* ===== FAQ ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  border-radius: var(--r-md);
  background: var(--c-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--c-border);
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.faq-item.active {
  border-color: var(--c-border-hover);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text);
  text-align: left;
  transition: color 0.25s;
}
.faq-q:hover {
  color: var(--c-accent);
}
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(39, 200, 216, 0.12);
  border: 1px solid rgba(39, 200, 216, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.3s;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-content {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.8;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

/* ===== CTA ===== */
.cta-section {
  padding: 90px 0;
  position: relative;
  background:
    radial-gradient(ellipse 50% 60% at 50% 50%, rgba(39, 200, 216, 0.1) 0%, transparent 70%),
    linear-gradient(180deg, rgba(8, 17, 32, 0.9), rgba(13, 31, 60, 0.8));
  text-align: center;
  border-top: 1px solid var(--c-border);
}
.cta-section h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--c-text);
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 15px;
  color: var(--c-text-2);
  margin-bottom: 32px;
}
.cta-btn {
  padding: 14px 40px;
  font-size: 15px;
}

/* ===== 页脚 ===== */
.footer {
  background: #050C18;
  padding-top: 60px;
  border-top: 1px solid var(--c-border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}
.footer-brand .logo {
  margin-bottom: 18px;
}
.footer-desc {
  font-size: 14px;
  color: var(--c-text-3);
  line-height: 1.8;
  max-width: 280px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 16px;
}
.footer-col a,
.footer-col p {
  display: block;
  font-size: 14px;
  color: var(--c-text-3);
  margin-bottom: 10px;
  transition: color 0.25s;
}
.footer-col a:hover {
  color: var(--c-accent);
}
.footer-col p {
  margin-bottom: 8px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 13px;
  color: var(--c-text-3);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-right {
    width: 360px;
  }
  .quick-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .cat-guide-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-cta {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .hero {
    min-height: auto;
    padding: 60px 0;
  }
  .hero-inner {
    flex-direction: column;
    gap: 40px;
  }
  .hero-left {
    text-align: center;
  }
  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-stats {
    justify-content: center;
  }
  .hero-right {
    width: 100%;
    max-width: 420px;
  }
  .section {
    padding: 48px 0;
  }
  .section-head {
    margin-bottom: 28px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .stat-item::after {
    display: none;
  }
  .news-card {
    flex-direction: column;
  }
  .news-thumb {
    width: 100%;
  }
  .news-thumb img {
    aspect-ratio: 16/8;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    font-size: 12px;
    padding: 16px 0;
  }
  .topbar-right {
    display: none;
  }
  .topbar-inner {
    justify-content: center;
  }
}

@media (max-width: 576px) {
  .quick-grid {
    grid-template-columns: 1fr;
  }
  .hero-left h1 {
    font-size: 1.9rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-stats {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 36px 0;
  }
  .feature-card {
    padding: 20px;
  }
  .cat-guide-card,
  .cat-guide-card img {
    min-height: 220px;
  }
  .section-head {
    gap: 8px;
  }
  .section-en {
    display: none;
  }
  .news-card {
    padding: 16px;
  }
  .footer-grid {
    padding: 0 16px 32px;
  }
  .container {
    padding: 0 16px;
  }
}

/* roulang page: category1 */
/* ======= 设计变量 ======= */
:root {
  --page-bg: #081120;
  --section-bg: #0D1F3C;
  --card-bg: rgba(16, 38, 68, 0.6);
  --card-bg-hover: rgba(22, 48, 86, 0.78);
  --overlay-bg: rgba(5, 12, 24, 0.8);
  --primary: #27C8D8;
  --secondary: #3B82F6;
  --text-main: #EAF2FF;
  --text-secondary: #9DB1CC;
  --text-muted: #5D7290;
  --text-disabled: #3D4E68;
  --border-line: rgba(120, 170, 255, 0.12);
  --border-active: rgba(39, 200, 216, 0.5);
  --success: #34D399;
  --warning: #FBBF24;
  --danger: #F87171;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.45);
  --glow-primary: 0 0 24px rgba(39, 200, 216, 0.3);
  --glow-strong: 0 0 32px rgba(39, 200, 216, 0.5);
  --transition: 0.25s ease;
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "HarmonyOS Sans SC", sans-serif;
}

/* ======= Reset ======= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  background: var(--page-bg);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
img {
  display: block;
  max-width: 100%;
}
button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}
ul, ol {
  list-style: none;
}
section {
  position: relative;
}

/* ======= 容器 ======= */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ======= 通用排版 ======= */
.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 12px;
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 32px;
}
.text-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.text-link:hover {
  color: var(--primary);
  transform: translateX(3px);
}

/* ======= 按钮 ======= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 10px 22px;
  transition: all 0.25s ease;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, #27C8D8, #3B82F6);
  color: #061226;
  box-shadow: 0 4px 20px rgba(39, 200, 216, 0.4);
  font-weight: 700;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(39, 200, 216, 0.55);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 2px 12px rgba(39, 200, 216, 0.35);
}
.btn-outline {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--text-main);
}
.btn-outline:hover {
  background: rgba(39, 200, 216, 0.12);
  border-color: var(--border-active);
  color: var(--primary);
}
.btn-outline:disabled, .btn-primary:disabled {
  background: rgba(61, 78, 104, 0.4);
  border-color: transparent;
  color: var(--text-disabled);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}
.btn-sm {
  padding: 7px 16px;
  font-size: 0.85rem;
  border-radius: 6px;
}
.btn-block {
  display: flex;
  width: 100%;
}

/* ======= 标签 / 徽章 ======= */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 500;
  background: rgba(39, 200, 216, 0.12);
  color: var(--primary);
  border: 1px solid rgba(39, 200, 216, 0.2);
  white-space: nowrap;
}
.badge-solid {
  background: rgba(59, 130, 246, 0.18);
  border-color: rgba(59, 130, 246, 0.3);
  color: #A5C8FF;
}
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  background: rgba(39, 200, 216, 0.2);
  color: var(--primary);
  border: 1px solid rgba(39, 200, 216, 0.25);
  letter-spacing: 0.02em;
}

/* ======= 顶部通栏 ======= */
.topbar {
  background: rgba(5, 12, 24, 0.9);
  border-bottom: 1px solid rgba(120, 170, 255, 0.06);
  font-size: 0.8rem;
  color: var(--text-secondary);
  height: 36px;
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1001;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.topbar-left svg {
  flex-shrink: 0;
}
.topbar-left span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
  white-space: nowrap;
}
.topbar-right .divider {
  width: 1px;
  height: 12px;
  background: rgba(120, 170, 255, 0.2);
}

/* ======= 主导航 ======= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 72px;
  background: rgba(8, 17, 32, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(120, 170, 255, 0.1);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.25);
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo-main {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.02em;
}
.logo-sub {
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 6px;
  position: relative;
  transition: color 0.2s ease, background 0.2s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(39, 200, 216, 0.6);
  transition: width 0.25s ease;
}
.nav-link:hover {
  color: var(--text-main);
}
.nav-link:hover::after {
  width: 60%;
}
.nav-link.active {
  color: #fff;
}
.nav-link.active::after {
  width: 70%;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-main);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.hamburger:hover {
  border-color: var(--border-active);
  background: rgba(39, 200, 216, 0.1);
}
.hamburger svg {
  width: 20px;
  height: 20px;
}

/* ======= 分类页 Hero ======= */
.category-hero {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(13, 31, 60, 0.92), rgba(8, 17, 32, 0.96)), url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
}
.category-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(39, 200, 216, 0.18) 0 1.5px, transparent 1.5px 42px),
    radial-gradient(circle, rgba(59, 130, 246, 0.14) 0 2px, transparent 2px 60px);
  background-size: 100% 100%, 100% 100%;
  pointer-events: none;
}
.category-hero::after {
  content: '';
  position: absolute;
  right: -100px;
  bottom: -130px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 1px dashed rgba(39, 200, 216, 0.2);
  box-shadow: 0 0 0 40px rgba(39, 200, 216, 0.04), 0 0 0 80px rgba(59, 130, 246, 0.03);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  padding: 40px 0;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}
.breadcrumb a:hover {
  color: var(--primary);
}
.breadcrumb .sep {
  color: var(--text-muted);
  margin: 0 2px;
}
.breadcrumb .current {
  color: var(--text-main);
}
.category-hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin-bottom: 14px;
  text-shadow: 0 0 20px rgba(39, 200, 216, 0.2);
}
.hero-subtitle {
  max-width: 640px;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ======= 主体两栏 ======= */
.category-main {
  padding: 56px 0 72px;
}
.category-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  align-items: start;
}

/* 侧边栏 */
.category-sidebar {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.sidebar-nav {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 12px;
  box-shadow: var(--shadow-card);
}
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
  margin-bottom: 2px;
}
.sidebar-link:last-child {
  margin-bottom: 0;
}
.sidebar-link:hover {
  color: var(--text-main);
  background: rgba(39, 200, 216, 0.06);
}
.sidebar-link.active {
  color: #fff;
  background: rgba(39, 200, 216, 0.1);
  border-left-color: var(--primary);
  box-shadow: 0 0 12px rgba(39, 200, 216, 0.15);
  font-weight: 600;
}
.sidebar-cta {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-card);
}
.sidebar-cta p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

/* 右侧内容 */
.category-content {
  min-width: 0;
}
.content-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(16, 38, 68, 0.5);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.content-intro p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
  min-width: 220px;
}
.content-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* 信息卡片 */
.info-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
}
.info-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover), 0 0 0 1px var(--border-active);
  border-color: var(--border-active);
}
.card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: rgba(16, 38, 68, 0.4);
}
.card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.info-card:hover .card-cover img {
  transform: scale(1.03);
}
.card-cover .tag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  background: rgba(8, 17, 32, 0.7);
  backdrop-filter: blur(8px);
  border-color: rgba(39, 200, 216, 0.35);
}
.info-card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.info-card-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
}
.info-card-body p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid rgba(120, 170, 255, 0.08);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ======= 特色区 ======= */
.feature-section {
  background: rgba(13, 31, 60, 0.55);
  padding: 72px 0;
  border-top: 1px solid var(--border-line);
  border-bottom: 1px solid var(--border-line);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-hover);
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--primary);
}
.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ======= 流程区 ======= */
.process-section {
  padding: 72px 0;
}
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.process-item {
  position: relative;
  background: rgba(16, 38, 68, 0.5);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color 0.2s ease, background 0.2s ease;
  counter-increment: step;
}
.process-item:hover {
  border-color: var(--border-active);
  background: rgba(22, 48, 86, 0.6);
}
.process-step {
  font-size: 1.6rem;
  font-weight: 800;
  color: rgba(39, 200, 216, 0.3);
  margin-bottom: 10px;
  line-height: 1;
}
.process-item h3 {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.process-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ======= FAQ ======= */
.faq-section {
  background: rgba(13, 31, 60, 0.45);
  padding: 72px 0;
  border-top: 1px solid var(--border-line);
  border-bottom: 1px solid var(--border-line);
}
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.faq-item:hover {
  border-color: rgba(39, 200, 216, 0.3);
}
.faq-item[open] {
  border-color: var(--border-active);
  box-shadow: 0 0 20px rgba(39, 200, 216, 0.1);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  list-style: none;
  user-select: none;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '+';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.25);
  color: var(--primary);
  font-size: 1rem;
  font-weight: 400;
  transition: transform 0.3s ease, background 0.2s ease;
  flex-shrink: 0;
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
  background: rgba(39, 200, 216, 0.2);
}
.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ======= CTA 区 ======= */
.cta-section {
  padding: 80px 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(39, 200, 216, 0.12) 0%, transparent 65%);
  pointer-events: none;
}
.cta-inner {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}
.cta-inner h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.cta-inner p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  font-size: 1rem;
  line-height: 1.8;
}

/* ======= Footer ======= */
.footer {
  background: #050C18;
  border-top: 1px solid rgba(120, 170, 255, 0.08);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo {
  margin-bottom: 16px;
}
.footer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 5px 0;
  transition: color 0.2s ease, transform 0.2s ease;
}
.footer-col a:hover {
  color: var(--primary);
  transform: translateX(3px);
}
.footer-col p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0;
}
.footer-bottom {
  border-top: 1px solid rgba(120, 170, 255, 0.08);
  padding: 16px 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-bottom p {
  line-height: 1.6;
}

/* ======= 返回首页入口条 ======= */
.return-line {
  padding: 20px 0;
  text-align: center;
  border-top: 1px solid rgba(120, 170, 255, 0.06);
}
.return-line a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color 0.2s ease, gap 0.2s ease;
}
.return-line a:hover {
  color: var(--primary);
  gap: 12px;
}

/* ======= 响应式 ======= */
@media (max-width: 1024px) {
  .category-layout {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }
  .content-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .process-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .topbar-right {
    display: none;
  }
  .topbar-left span {
    white-space: normal;
  }
  .site-header {
    height: 64px;
  }
  .header-inner {
    height: 64px;
  }
  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 82%;
    max-width: 360px;
    background: rgba(5, 12, 24, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 32px 40px;
    gap: 10px;
    transform: translateX(105%);
    transition: transform 0.3s ease;
    z-index: 2000;
    box-shadow: -16px 0 40px rgba(0, 0, 0, 0.5);
    border-left: 1px solid var(--border-line);
  }
  .nav-menu.open {
    transform: translateX(0);
  }
  .nav-link {
    font-size: 1.05rem;
    padding: 12px 10px;
    width: 100%;
    border-bottom: 1px solid rgba(120, 170, 255, 0.06);
  }
  .nav-link::after {
    display: none;
  }
  .nav-link.active {
    color: var(--primary);
    background: rgba(39, 200, 216, 0.08);
  }
  .hamburger {
    display: flex;
  }
  .header-actions .btn-outline {
    display: none;
  }
  .category-hero {
    height: 320px;
  }
  .category-hero h1 {
    font-size: 2rem;
  }
  .hero-subtitle {
    font-size: 0.95rem;
  }
  .category-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .category-sidebar {
    position: static;
    flex-direction: column;
  }
  .sidebar-nav {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    padding: 10px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .sidebar-nav::-webkit-scrollbar {
    display: none;
  }
  .sidebar-link {
    padding: 8px 14px;
    border-left: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    font-size: 0.85rem;
    flex-shrink: 0;
  }
  .sidebar-link.active {
    border-left-color: transparent;
    border-bottom-color: var(--primary);
    box-shadow: none;
  }
  .sidebar-cta {
    display: none;
  }
  .content-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .section-title {
    font-size: 1.4rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 24px;
  }
  .cta-section {
    padding: 56px 0;
  }
  .cta-inner h2 {
    font-size: 1.4rem;
  }
  .return-line {
    padding: 16px 0;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 16px;
  }
  .topbar {
    height: auto;
    min-height: 32px;
    padding: 4px 0;
  }
  .topbar-left span {
    font-size: 0.72rem;
  }
  .category-hero {
    height: 280px;
  }
  .category-hero h1 {
    font-size: 1.7rem;
  }
  .hero-subtitle {
    font-size: 0.88rem;
    line-height: 1.7;
  }
  .breadcrumb {
    font-size: 0.75rem;
  }
  .info-card-body {
    padding: 16px;
  }
  .info-card-body p {
    font-size: 0.84rem;
  }
  .process-grid {
    grid-template-columns: 1fr;
  }
  .process-item {
    padding: 18px;
  }
  .process-step {
    font-size: 1.3rem;
  }
  .faq-item summary {
    padding: 16px;
    font-size: 0.88rem;
    gap: 12px;
  }
  .faq-answer {
    padding: 0 16px 16px;
    font-size: 0.84rem;
  }
  .btn {
    width: 100%;
  }
  .content-intro {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 16px;
  }
  .content-intro .badge {
    align-self: flex-start;
  }
  .footer-grid {
    gap: 24px;
  }
  .footer-bottom {
    font-size: 0.72rem;
    padding: 14px 12px;
  }
}

/* roulang page: article */
:root {
  --primary: #0B1B33;
  --accent: #27C8D8;
  --accent-alt: #3B82F6;
  --bg-deep: #081120;
  --bg-secondary: #0D1F3C;
  --bg-card: rgba(16, 38, 68, 0.6);
  --bg-float: rgba(5, 12, 24, 0.8);
  --text-main: #EAF2FF;
  --text-secondary: #9DB1CC;
  --text-muted: #5D7290;
  --text-disabled: #3D4E68;
  --border: rgba(120, 170, 255, 0.12);
  --border-hover: rgba(39, 200, 216, 0.5);
  --glow-accent: rgba(39, 200, 216, 0.3);
  --glow-strong: rgba(39, 200, 216, 0.5);
  --success: #34D399;
  --warning: #FBBF24;
  --danger: #F87171;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3), inset 0 0 0 1px rgba(255,255,255,0.04);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.45), 0 0 0 1px rgba(39,200,216,0.25);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "HarmonicOS Sans SC", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; border: none; background: none; cursor: pointer; color: inherit; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 24px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.92rem; line-height: 1.4;
  transition: all 0.28s ease; white-space: nowrap; border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, #27C8D8, #3B82F6);
  color: #061226; font-weight: 700;
  box-shadow: 0 4px 20px rgba(39,200,216,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(39,200,216,0.55);
  color: #061226;
}
.btn-primary:active { transform: translateY(0); box-shadow: 0 2px 12px rgba(39,200,216,0.3); }
.btn-outline {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.18);
  color: var(--text-main);
}
.btn-outline:hover {
  background: rgba(39,200,216,0.12);
  border-color: rgba(39,200,216,0.5);
  color: #fff;
}
.btn-sm { padding: 7px 16px; font-size: 0.85rem; }
.btn-lg { padding: 14px 36px; font-size: 1rem; }
.btn-block { width: 100%; }
.tag {
  display: inline-flex; align-items: center;
  padding: 3px 12px; border-radius: var(--radius-pill);
  font-size: 0.78rem; font-weight: 500;
  background: rgba(39,200,216,0.12);
  color: var(--accent);
  border: 1px solid rgba(39,200,216,0.2);
}
/* Topbar */
.topbar {
  background: rgba(4, 10, 22, 0.9);
  border-bottom: 1px solid rgba(120,170,255,0.06);
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 0;
  height: 36px;
  display: flex; align-items: center;
  backdrop-filter: blur(10px);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.topbar-announce { display: flex; align-items: center; gap: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-announce svg { flex-shrink: 0; opacity: 0.8; }
.topbar-meta { display: flex; align-items: center; gap: 8px; white-space: nowrap; color: var(--text-muted); font-size: 0.78rem; }
/* Header */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8, 17, 32, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(120,170,255,0.08);
  height: 72px;
  display: flex; align-items: center;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 42px; height: 42px; border-radius: var(--radius-md);
  background: var(--bg-card);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(39,200,216,0.2);
  box-shadow: 0 0 16px rgba(39,200,216,0.12);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-main { font-size: 1.3rem; font-weight: 800; color: var(--text-main); letter-spacing: 0.02em; }
.logo-sub { font-size: 0.7rem; color: var(--text-muted); font-weight: 400; letter-spacing: 0.08em; }
.nav-menu { display: flex; align-items: center; gap: 6px; }
.nav-menu .nav-link {
  padding: 8px 16px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color 0.25s ease;
  white-space: nowrap;
}
.nav-menu .nav-link::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 0;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  box-shadow: 0 0 8px rgba(39,200,216,0.6);
  opacity: 0; transform: scaleX(0.6);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.nav-menu .nav-link:hover { color: #fff; }
.nav-menu .nav-link:hover::after { opacity: 1; transform: scaleX(1); }
.nav-menu .nav-link.active { color: #fff; }
.nav-menu .nav-link.active::after { opacity: 1; transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.header-actions .btn { border-radius: var(--radius-pill); }
.menu-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  align-items: center; justify-content: center;
  flex-direction: column; gap: 4px;
}
.menu-toggle span { display: block; width: 18px; height: 2px; background: var(--text-main); border-radius: 2px; transition: transform 0.3s ease, opacity 0.3s ease; }
.menu-toggle.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
/* Mobile menu */
.mobile-menu {
  position: fixed; top: 108px; left: 0; right: 0; bottom: 0;
  background: rgba(5,12,24,0.96);
  backdrop-filter: blur(20px);
  z-index: 99;
  display: flex; flex-direction: column;
  padding: 32px 24px;
  opacity: 0; visibility: hidden; transform: translateY(-10px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}
.mobile-menu.open { opacity: 1; visibility: visible; transform: translateY(0); }
.mobile-menu a {
  display: block;
  padding: 16px 8px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  border-bottom: 1px solid rgba(120,170,255,0.08);
  transition: color 0.2s;
}
.mobile-menu a:hover { color: var(--accent); }
.mobile-menu a.active { color: var(--accent); }
.mobile-menu .btn { margin-top: 24px; }
/* Breadcrumb */
.breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  font-size: 0.82rem; color: var(--text-muted);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-secondary); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .divider { color: var(--text-disabled); }
.breadcrumb .current { color: var(--text-secondary); max-width: 260px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
/* Article Hero */
.article-hero {
  position: relative;
  padding: 56px 0 48px;
  background: linear-gradient(135deg, rgba(8,17,32,0.92), rgba(13,31,60,0.86)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom: 1px solid rgba(120,170,255,0.08);
  overflow: hidden;
}
.article-hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(39,200,216,0.08), transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(59,130,246,0.08), transparent 60%);
  pointer-events: none;
}
.article-hero .container { position: relative; z-index: 1; }
.article-hero h1 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 16px;
  max-width: 820px;
  text-shadow: 0 0 20px rgba(39,200,216,0.2);
}
.article-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px;
  font-size: 0.86rem; color: var(--text-secondary);
}
.article-meta .meta-item { display: flex; align-items: center; gap: 6px; }
.article-meta .meta-item svg { opacity: 0.7; }
/* Article Layout */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  padding: 48px 0 32px;
}
.article-main-col { min-width: 0; }
/* Article Content */
.article-content {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 32px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-main);
  word-break: break-word;
}
.article-content h2 {
  font-size: 1.4rem; font-weight: 700;
  margin: 2rem 0 1rem;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(120,170,255,0.1);
}
.article-content h3 {
  font-size: 1.15rem; font-weight: 600;
  margin: 1.6rem 0 0.8rem;
}
.article-content p { margin-bottom: 1.2rem; }
.article-content strong { color: #fff; font-weight: 600; }
.article-content ul, .article-content ol { margin: 1rem 0; padding-left: 1.5rem; }
.article-content li { margin-bottom: 0.5rem; }
.article-content img {
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  box-shadow: var(--shadow-card);
}
.article-content blockquote {
  border-left: 3px solid var(--accent);
  background: rgba(39,200,216,0.06);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  color: var(--text-secondary);
}
.article-content a { color: var(--accent); word-break: break-all; }
.article-content table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
.article-content th, .article-content td {
  border: 1px solid rgba(120,170,255,0.12);
  padding: 10px 12px; text-align: left;
}
.article-content th { background: rgba(39,200,216,0.08); font-weight: 600; }
/* Empty state */
.article-empty {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 64px 32px;
  text-align: center;
}
.empty-icon {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: rgba(39,200,216,0.1);
  border: 1px solid rgba(39,200,216,0.2);
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.empty-icon svg { opacity: 0.8; }
.article-empty h2 { font-size: 1.4rem; margin-bottom: 8px; color: var(--text-main); }
.article-empty p { color: var(--text-secondary); margin-bottom: 24px; }
/* Article Pager */
.article-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}
.pager-item {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 20px 24px;
  transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.2s;
  border: 1px solid transparent;
}
.pager-item:hover {
  background: rgba(20, 48, 84, 0.7);
  box-shadow: var(--shadow-hover);
  border-color: rgba(39,200,216,0.25);
  transform: translateY(-2px);
}
.pager-item.pager-next { justify-content: flex-end; text-align: right; }
.pager-arrow {
  font-size: 1.2rem; color: var(--accent);
  flex-shrink: 0;
  transition: transform 0.25s ease;
}
.pager-item:hover .pager-arrow { transform: scale(1.2); }
.pager-item.pager-prev:hover .pager-arrow { transform: translateX(-3px) scale(1.1); }
.pager-item.pager-next:hover .pager-arrow { transform: translateX(3px) scale(1.1); }
.pager-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.pager-info-right { align-items: flex-end; }
.pager-label { font-size: 0.78rem; color: var(--text-muted); }
.pager-title { font-size: 0.95rem; color: var(--text-main); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
/* Sidebar */
.article-sidebar { display: flex; flex-direction: column; gap: 24px; }
.sidebar-widget {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
}
.sidebar-widget h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(120,170,255,0.08);
}
.side-card {
  display: flex; align-items: center; gap: 12px;
  padding: 10px;
  border-radius: var(--radius-md);
  transition: background 0.25s ease;
}
.side-card + .side-card { margin-top: 4px; }
.side-card:hover { background: rgba(39,200,216,0.06); }
.side-card img {
  width: 56px; height: 56px; border-radius: var(--radius-sm);
  object-fit: cover; flex-shrink: 0;
  background: var(--bg-secondary);
}
.side-card h4 { font-size: 0.92rem; font-weight: 600; color: var(--text-main); }
.side-card span { font-size: 0.76rem; color: var(--text-muted); display: block; line-height: 1.4; }
.side-links { list-style: none; }
.side-links li { border-bottom: 1px solid rgba(120,170,255,0.06); }
.side-links li:last-child { border-bottom: none; }
.side-links a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.side-links a:hover { color: var(--accent); padding-left: 4px; }
.side-links a span { font-size: 0.85rem; opacity: 0.6; transition: opacity 0.2s, transform 0.2s; }
.side-links a:hover span { opacity: 1; transform: translateX(3px); }
.article-sidebar .btn { margin-top: 4px; }
/* Related Section */
.related-section {
  padding: 56px 0 64px;
  border-top: 1px solid rgba(120,170,255,0.08);
}
.section-title {
  font-size: 1.6rem; font-weight: 700;
  margin-bottom: 32px;
  color: var(--text-main);
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: "";
  position: absolute; left: 0; bottom: -6px;
  width: 40px; height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  box-shadow: 0 0 10px rgba(39,200,216,0.4);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 8px;
}
.related-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid transparent;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(39,200,216,0.25);
}
.related-card img {
  width: 100%; height: 160px;
  object-fit: cover;
  background: var(--bg-secondary);
}
.related-body { padding: 20px 24px 24px; }
.related-body .tag { margin-bottom: 10px; }
.related-body h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 6px; color: var(--text-main); }
.related-body p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }
/* CTA */
.cta-section {
  position: relative;
  padding: 80px 0;
  text-align: center;
  background:
    radial-gradient(circle at 50% 50%, rgba(39,200,216,0.1), transparent 60%),
    linear-gradient(135deg, rgba(8,17,32,0.95), rgba(13,31,60,0.9)),
    url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  border-top: 1px solid rgba(120,170,255,0.08);
  border-bottom: 1px solid rgba(120,170,255,0.08);
}
.cta-section h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}
.cta-section p { color: var(--text-secondary); font-size: 1rem; margin-bottom: 32px; }
.cta-section .btn { margin: 0 auto; }
/* Footer */
.footer {
  background: #050C18;
  padding: 64px 0 0;
  border-top: 1px solid rgba(120,170,255,0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 300px;
}
.footer-col h4 {
  font-size: 0.95rem; font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-col p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.footer-bottom {
  border-top: 1px solid rgba(120,170,255,0.06);
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-muted);
}
/* Responsive */
@media screen and (max-width: 1024px) {
  .article-layout { grid-template-columns: minmax(0, 1fr) 280px; gap: 32px; }
  .related-grid { grid-template-columns: 1fr 1fr; }
}
@media screen and (max-width: 768px) {
  .nav-menu, .header-actions .btn { display: none; }
  .menu-toggle { display: inline-flex; }
  .article-hero { padding: 40px 0 32px; }
  .article-layout { grid-template-columns: 1fr; padding: 32px 0 24px; }
  .article-content { padding: 24px; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media screen and (max-width: 576px) {
  .container { padding: 0 16px; }
  .topbar-meta { display: none; }
  .article-hero h1 { font-size: 1.4rem; }
  .article-meta { gap: 10px; flex-direction: column; align-items: flex-start; }
  .article-content { padding: 20px; font-size: 0.95rem; }
  .article-pager { grid-template-columns: 1fr; }
  .pager-item.pager-next { justify-content: flex-start; text-align: left; }
  .pager-info-right { align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-col h4 { margin-bottom: 10px; }
  .section-title { font-size: 1.3rem; }
  .cta-section { padding: 56px 0; }
}

/* roulang page: category3 */
:root {
  --primary: #0B1B33;
  --primary-deep: #081120;
  --primary-mid: #0D1F3C;
  --accent: #27C8D8;
  --accent-blue: #3B82F6;
  --success: #34D399;
  --warning: #FBBF24;
  --error: #F87171;
  --text-main: #EAF2FF;
  --text-secondary: #9DB1CC;
  --text-muted: #5D7290;
  --text-disabled: #3D4E68;
  --border: rgba(120, 170, 255, 0.12);
  --border-hover: rgba(39, 200, 216, 0.5);
  --glow-cyan: rgba(39, 200, 216, 0.3);
  --glow-cyan-strong: rgba(39, 200, 216, 0.5);
  --card-bg: rgba(16, 38, 68, 0.6);
  --overlay: rgba(5, 12, 24, 0.8);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3), inset 0 0 0 1px rgba(255,255,255,0.04);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.45), 0 0 0 1px rgba(39,200,216,0.25);
  --space-section: 88px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "HarmonicOS Sans SC", sans-serif;
  --font-num: "DIN Alternate", "Bahnschrift", "Arial", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--primary-deep);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: color .25s ease; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
input, textarea { font-family: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* === 顶部公告栏 === */
.top-bar {
  background: rgba(5, 12, 24, 0.9);
  border-bottom: 1px solid rgba(120, 170, 255, 0.08);
  min-height: 36px;
  display: flex;
  align-items: center;
  font-size: 13px;
  color: var(--text-secondary);
  position: relative;
  z-index: 100;
}
.top-bar .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.top-bar-msg { display: flex; align-items: center; gap: 8px; }
.top-bar-msg i { color: var(--accent); font-size: 12px; }
.top-bar-meta { display: flex; align-items: center; gap: 16px; color: var(--text-muted); }
.top-bar-meta span { white-space: nowrap; }

/* === 主导航 === */
.main-header {
  position: sticky;
  top: 0;
  z-index: 99;
  background: rgba(8, 17, 32, 0.85);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(120, 170, 255, 0.08);
  height: 72px;
  display: flex;
  align-items: center;
}
.main-header .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }

.logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-icon {
  width: 44px; height: 44px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.25);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-main { font-size: 22px; font-weight: 800; letter-spacing: 0.02em; }
.logo-sub { font-size: 12px; color: var(--text-secondary); font-weight: 400; letter-spacing: 0.08em; }

.nav-menu { display: flex; align-items: center; gap: 36px; }
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 2px;
  transition: color .25s ease;
  white-space: nowrap;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 12px var(--glow-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s ease;
}
.nav-link:hover { color: var(--text-main); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link.active { color: var(--text-main); }
.nav-link.active::after { transform: scaleX(1); }

.btn-quick {
  padding: 9px 22px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  background: rgba(39, 200, 216, 0.08);
  border: 1px solid rgba(39, 200, 216, 0.4);
  border-radius: var(--radius-sm);
  transition: all .3s ease;
  white-space: nowrap;
}
.btn-quick:hover {
  background: rgba(39, 200, 216, 0.18);
  border-color: rgba(39, 200, 216, 0.7);
  box-shadow: 0 0 20px rgba(39, 200, 216, 0.3);
}

/* 汉堡按钮 */
.hamburger { display: none; width: 44px; height: 44px; border-radius: 10px; align-items: center; justify-content: center; background: rgba(255,255,255,0.06); border: 1px solid var(--border); }
.hamburger span { display: block; width: 20px; height: 2px; background: var(--text-main); position: relative; transition: background .3s; }
.hamburger span::before, .hamburger span::after { content: ''; position: absolute; left: 0; width: 20px; height: 2px; background: var(--text-main); transition: all .3s; }
.hamburger span::before { top: -6px; }
.hamburger span::after { top: 6px; }

.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(5, 12, 24, 0.96);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
  z-index: 998;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  visibility: hidden;
  transition: all .4s ease;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a { font-size: 22px; font-weight: 600; color: var(--text-secondary); }
.mobile-menu a.active { color: var(--accent); }
.mobile-close { position: absolute; top: 24px; right: 24px; width: 44px; height: 44px; border-radius: 10px; background: rgba(255,255,255,0.08); color: var(--text-main); font-size: 22px; }

/* === 分类页 Hero === */
.category-hero {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(6, 16, 34, 0.92) 0%, rgba(9, 24, 48, 0.88) 50%, rgba(6, 16, 34, 0.94) 100%),
    url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
}
.category-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(39,200,216,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(39,200,216,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events: none;
}
.category-hero::after {
  content: '';
  position: absolute;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(39,200,216,0.12) 0%, transparent 70%);
  top: -160px;
  right: -100px;
  pointer-events: none;
}
.hero-diamond {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
}
.hero-diamond::before,
.hero-diamond::after {
  content: '';
  position: absolute;
  border: 1px solid rgba(39,200,216,0.15);
  transform: rotate(45deg);
}
.hero-diamond::before { width: 280px; height: 280px; top: 40px; left: 12%; }
.hero-diamond::after { width: 160px; height: 160px; bottom: 60px; right: 14%; }
.hero-inner { position: relative; z-index: 2; max-width: 760px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(39,200,216,0.1);
  border: 1px solid rgba(39,200,216,0.3);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 24px;
}
.category-hero h1 {
  font-size: clamp(2rem, 4.6vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  text-shadow: 0 0 30px rgba(39,200,216,0.15);
}
.category-hero h1 em { font-style: normal; color: var(--accent); }
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 28px;
  line-height: 1.8;
}
.hero-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
}
.hero-breadcrumb a { color: var(--text-secondary); }
.hero-breadcrumb a:hover { color: var(--accent); }
.hero-breadcrumb i { font-size: 11px; }

/* === 主体两栏 === */
.category-main {
  padding: 72px 0 var(--space-section);
  background: var(--primary-deep);
}
.category-wrapper {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  align-items: start;
}

/* 左侧分类导航 */
.side-nav {
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 24px;
  position: sticky;
  top: 100px;
  box-shadow: var(--shadow-card);
}
.side-nav-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  padding-bottom: 16px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.side-nav-title i { color: var(--accent); }
.side-nav-list { display: flex; flex-direction: column; gap: 4px; }
.side-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all .25s ease;
}
.side-nav-link i { width: 18px; text-align: center; font-size: 14px; opacity: 0.7; }
.side-nav-link:hover { color: var(--text-main); background: rgba(255,255,255,0.04); }
.side-nav-link.active {
  color: var(--text-main);
  background: rgba(39,200,216,0.08);
  border-color: rgba(39,200,216,0.25);
  position: relative;
}
.side-nav-link.active::before {
  content: '';
  position: absolute;
  left: 0; top: 20%;
  width: 3px; height: 60%;
  background: var(--accent);
  border-radius: 3px;
  box-shadow: 0 0 12px var(--glow-cyan);
}
.side-nav-cta {
  margin-top: 24px;
  padding: 20px 16px;
  background: linear-gradient(135deg, rgba(39,200,216,0.1), rgba(59,130,246,0.08));
  border: 1px solid rgba(39,200,216,0.2);
  border-radius: var(--radius-md);
  text-align: center;
}
.side-nav-cta p { font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; line-height: 1.6; }
.side-nav-cta a { display: inline-block; padding: 8px 20px; font-size: 13px; font-weight: 600; color: var(--primary-deep); background: linear-gradient(135deg, var(--accent), var(--accent-blue)); border-radius: 6px; box-shadow: 0 4px 16px rgba(39,200,216,0.35); transition: all .3s ease; }
.side-nav-cta a:hover { box-shadow: 0 6px 24px rgba(39,200,216,0.5); transform: translateY(-2px); }

/* 右侧内容区 */
.category-content { min-width: 0; }
.cat-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 24px;
  background: rgba(16,38,68,0.45);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 28px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.cat-info-bar p { font-size: 14px; color: var(--text-secondary); }
.cat-info-bar strong { color: var(--accent); font-weight: 600; }
.count-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: rgba(39,200,216,0.1);
  border: 1px solid rgba(39,200,216,0.25);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--accent);
  white-space: nowrap;
}

/* 内容网格 */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.cat-card {
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all .3s ease;
  display: flex;
  flex-direction: column;
}
.cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(39,200,216,0.35);
}
.cat-card-img { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.cat-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.cat-card:hover .cat-card-img img { transform: scale(1.04); }
.cat-card-tag {
  position: absolute;
  top: 12px; left: 12px;
  padding: 4px 12px;
  font-size: 12px;
  background: rgba(5,12,24,0.7);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  color: var(--accent);
  border: 1px solid rgba(39,200,216,0.3);
  border-radius: var(--radius-pill);
  z-index: 2;
}
.cat-card-body { padding: 20px 20px 16px; display: flex; flex-direction: column; flex: 1; }
.cat-card-body h3 { font-size: 1.1rem; font-weight: 600; line-height: 1.5; margin-bottom: 10px; color: var(--text-main); }
.cat-card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex: 1; }
.cat-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}
.cat-card-meta .read-more { color: var(--accent); font-weight: 500; display: inline-flex; align-items: center; gap: 4px; transition: all .25s; }
.cat-card-meta .read-more:hover { gap: 8px; }

/* === 流程板块 === */
.process-section {
  padding: 72px 0;
  background: var(--primary-mid);
  position: relative;
  overflow: hidden;
}
.process-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 30% 50%, rgba(39,200,216,0.05) 0%, transparent 60%);
  pointer-events: none;
}
.section-head { text-align: center; margin-bottom: 48px; position: relative; z-index: 2; }
.section-eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
  font-weight: 600;
}
.section-head h2 { font-size: 1.7rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 12px; }
.section-head p { color: var(--text-secondary); font-size: 15px; max-width: 560px; margin: 0 auto; }
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  z-index: 2;
}
.process-item {
  background: rgba(10, 25, 50, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all .3s ease;
  position: relative;
}
.process-item:hover { border-color: rgba(39,200,216,0.4); box-shadow: 0 8px 32px rgba(0,0,0,0.35), 0 0 0 1px rgba(39,200,216,0.2); transform: translateY(-4px); }
.process-num {
  width: 48px; height: 48px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(39,200,216,0.2), rgba(59,130,246,0.12));
  border: 1px solid rgba(39,200,216,0.35);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  box-shadow: 0 0 20px rgba(39,200,216,0.15);
}
.process-item h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 10px; }
.process-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* === FAQ 板块 === */
.faq-section { padding: var(--space-section) 0; background: var(--primary-deep); }
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color .3s ease;
}
.faq-item:hover { border-color: rgba(39,200,216,0.3); }
.faq-question {
  padding: 0 24px;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  width: 100%;
  text-align: left;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  background: none;
}
.faq-question i { transition: transform .35s ease; color: var(--accent); font-size: 16px; }
.faq-item.open .faq-question i { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid transparent;
}
.faq-item.open .faq-answer-inner { border-top-color: var(--border); }

/* === CTA 尾区 === */
.cta-section {
  padding: 80px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 0%, rgba(39,200,216,0.12) 0%, transparent 55%),
    linear-gradient(180deg, rgba(8,17,32,0.95), rgba(5,12,24,0.98));
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(39,200,216,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(39,200,216,0.03) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}
.cta-inner { position: relative; z-index: 2; max-width: 640px; margin: 0 auto; }
.cta-inner h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); font-weight: 700; margin-bottom: 14px; }
.cta-inner p { color: var(--text-secondary); font-size: 15px; margin-bottom: 32px; line-height: 1.8; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 40px;
  font-size: 16px;
  font-weight: 700;
  color: #061226;
  background: linear-gradient(135deg, var(--accent), var(--accent-blue));
  border-radius: 10px;
  box-shadow: 0 4px 24px rgba(39,200,216,0.4);
  transition: all .3s ease;
  border: none;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 36px rgba(39,200,216,0.55); }
.btn-primary:active { transform: translateY(0); box-shadow: 0 2px 16px rgba(39,200,216,0.4); }

/* === 返回首页入口条 === */
.back-home-strip {
  padding: 32px 0;
  background: rgba(13, 31, 60, 0.4);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.back-home-strip a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  padding: 12px 28px;
  background: rgba(39,200,216,0.06);
  border: 1px solid rgba(39,200,216,0.2);
  border-radius: var(--radius-pill);
  transition: all .3s ease;
}
.back-home-strip a:hover { background: rgba(39,200,216,0.14); border-color: rgba(39,200,216,0.45); gap: 14px; }
.back-home-strip a i { color: var(--accent); }

/* === 页脚 === */
.footer {
  background: #050C18;
  padding: 64px 0 0;
}
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-desc { font-size: 14px; color: var(--text-muted); line-height: 1.8; margin-top: 14px; max-width: 300px; }
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 24px; height: 2px;
  background: var(--accent);
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  transition: color .25s;
}
.footer-col a:hover { color: var(--accent); }
.footer-col p { font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.footer-col p i { color: var(--accent); width: 16px; }
.footer-bottom {
  margin-top: 48px;
  padding: 20px 24px;
  border-top: 1px solid rgba(120, 170, 255, 0.08);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom p { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; }

/* === 响应式 === */
@media (max-width: 1024px) {
  .category-wrapper { grid-template-columns: 220px 1fr; }
  .cat-grid { gap: 20px; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --space-section: 56px; }
  .top-bar .container > span:last-child { display: none; }
  .nav-menu { display: none; }
  .btn-quick { display: none; }
  .hamburger { display: flex; }
  .category-wrapper { grid-template-columns: 1fr; }
  .side-nav {
    position: static;
    padding: 16px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .side-nav-title, .side-nav-cta { display: none; }
  .side-nav-list { flex-direction: row; gap: 8px; }
  .side-nav-link { white-space: nowrap; padding: 10px 16px; font-size: 14px; }
  .side-nav-link.active::before { display: none; }
  .side-nav-link.active { border-radius: var(--radius-pill); background: rgba(39,200,216,0.12); }
  .cat-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; gap: 16px; }
  .hero-sub { font-size: 15px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 576px) {
  .container { padding: 0 16px; }
  .top-bar { font-size: 12px; }
  .category-hero { min-height: 360px; padding: 60px 16px; }
  .cat-info-bar { flex-direction: column; align-items: flex-start; }
  .section-head h2 { font-size: 1.4rem; }
  .cta-inner h2 { font-size: 1.5rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom p { flex-direction: column; gap: 4px; }
  .btn-primary { width: 100%; justify-content: center; }
}

/* roulang page: category2 */
:root {
  --primary: #0B1B33;
  --accent: #27C8D8;
  --accent-blue: #3B82F6;
  --bg-dark: #081120;
  --bg-secondary: #0D1F3C;
  --card-bg: rgba(16, 38, 68, 0.6);
  --card-bg-hover: rgba(20, 48, 84, 0.72);
  --overlay: rgba(5, 12, 24, 0.8);
  --text-main: #EAF2FF;
  --text-secondary: #9DB1CC;
  --text-muted: #5D7290;
  --border: rgba(120, 170, 255, 0.12);
  --border-accent: rgba(39, 200, 216, 0.5);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --glow: 0 0 24px rgba(39, 200, 216, 0.3);
  --glow-hover: 0 0 32px rgba(39, 200, 216, 0.5);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.45);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "HarmonicOS Sans SC", sans-serif;
  --font-num: "DIN Alternate", "Bahnschrift", Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

ul,
ol {
  list-style: none;
}

button,
input {
  font-family: inherit;
  border: none;
  outline: none;
  background: none;
  cursor: pointer;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 88px 0;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 52px;
}

.section-head h2 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-head .section-en {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.section-head p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

/* ============ 顶部通栏 ============ */
.top-bar {
  background: rgba(4, 10, 20, 0.92);
  border-bottom: 1px solid rgba(120, 170, 255, 0.08);
  font-size: 0.82rem;
  color: var(--text-secondary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 36px;
}

.top-announce {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-announce .icon-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(39, 200, 216, 0.6);
}

.top-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

/* ============ 主导航 ============ */
.main-nav {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(8, 17, 32, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(120, 170, 255, 0.1);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 48px;
  flex-shrink: 0;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.2);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-main {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 0.02em;
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  margin-left: auto;
}

.nav-link {
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 2px;
  transition: color 0.3s;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: transparent;
  border-radius: 2px;
  transition: background 0.3s, box-shadow 0.3s;
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-link:hover::after {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(39, 200, 216, 0.5);
}

.nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  background: var(--accent);
  box-shadow: 0 0 12px rgba(39, 200, 216, 0.6);
}

.nav-cta {
  margin-left: 28px;
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid rgba(39, 200, 216, 0.5);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.3s;
}

.nav-cta:hover {
  background: rgba(39, 200, 216, 0.12);
  box-shadow: 0 0 16px rgba(39, 200, 216, 0.15);
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ============ 分类页 Hero ============ */
.category-hero {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(11, 27, 51, 0.92), rgba(8, 17, 32, 0.96)), url("/assets/images/backpic/back-2.webp") center/cover no-repeat;
}

.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(39, 200, 216, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(39, 200, 216, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.7), transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.7), transparent 75%);
}

.category-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: 50%;
  width: 400px;
  height: 400px;
  transform: translateY(-50%);
  background: radial-gradient(circle, rgba(39, 200, 216, 0.12) 0%, transparent 65%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.hero-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.3s;
}

.hero-breadcrumb a:hover {
  color: var(--accent);
}

.hero-breadcrumb .sep {
  color: var(--text-muted);
}

.category-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-shadow: 0 0 20px rgba(39, 200, 216, 0.2);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: rgba(39, 200, 216, 0.08);
  border: 1px solid rgba(39, 200, 216, 0.15);
}

/* ============ 分类主体：左侧导航 + 右侧网格 ============ */
.category-main {
  padding: 72px 0 88px;
  background: var(--bg-dark);
}

.category-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
}

.category-sidebar {
  position: sticky;
  top: 96px;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
}

.category-sidebar h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.category-menu li {
  margin-bottom: 4px;
}

.category-menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: all 0.3s;
  border-left: 3px solid transparent;
}

.category-menu a:hover {
  color: var(--text-main);
  background: rgba(39, 200, 216, 0.06);
}

.category-menu a.active {
  color: #ffffff;
  background: rgba(39, 200, 216, 0.1);
  border-left-color: var(--accent);
  box-shadow: inset 0 0 20px rgba(39, 200, 216, 0.04);
}

.category-menu .menu-all {
  margin-bottom: 8px;
}

.sidebar-card {
  margin-top: 24px;
  padding: 20px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.15);
  text-align: center;
}

.sidebar-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.6;
}

.sidebar-card .btn {
  width: 100%;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  transition: all 0.3s;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-blue));
  color: #061226;
  box-shadow: 0 4px 20px rgba(39, 200, 216, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(39, 200, 216, 0.55);
  color: #061226;
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 16px rgba(39, 200, 216, 0.3);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(39, 200, 216, 0.12);
  border-color: rgba(39, 200, 216, 0.4);
  color: #fff;
  box-shadow: var(--glow);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(39, 200, 216, 0.5);
  color: var(--accent);
}

.btn-outline:hover {
  background: rgba(39, 200, 216, 0.1);
  box-shadow: var(--glow);
  color: #fff;
}

/* 右侧内容区 */
.category-content {
  min-width: 0;
}

.category-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  margin-bottom: 28px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.category-info-bar .badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  border-radius: 999px;
  background: rgba(39, 200, 216, 0.12);
  border: 1px solid rgba(39, 200, 216, 0.25);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.content-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  display: flex;
  flex-direction: column;
}

.content-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover), 0 0 0 1px var(--border-accent);
  border-color: rgba(39, 200, 216, 0.3);
}

.card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-secondary);
}

.card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.content-card:hover .card-cover img {
  transform: scale(1.03);
}

.card-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(8, 17, 32, 0.78);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(39, 200, 216, 0.25);
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 600;
}

.card-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 10px;
  transition: color 0.3s;
}

.content-card:hover .card-body h3 {
  color: var(--accent);
}

.card-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.card-meta .read-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent);
  font-weight: 600;
  transition: gap 0.3s;
}

.card-meta .read-link:hover {
  gap: 8px;
}

/* ============ 核心优势 ============ */
.features-section {
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.features-section::before {
  content: "";
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(39, 200, 216, 0.08), transparent 70%);
  pointer-events: none;
}

.features-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 24px;
}

.feature-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover), 0 0 0 1px var(--border-accent);
}

.feature-card:first-child {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background:
    linear-gradient(145deg, rgba(39, 200, 216, 0.06), rgba(13, 31, 60, 0.7)),
    var(--card-bg);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.2);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-card:first-child h3 {
  font-size: 1.4rem;
  margin-bottom: 14px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.feature-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 28px;
}

.feature-stat {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(8, 17, 32, 0.5);
  border: 1px solid var(--border);
  text-align: center;
}

.feature-stat .num {
  font-family: var(--font-num);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 16px rgba(39, 200, 216, 0.3);
  display: block;
  line-height: 1;
}

.feature-stat .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 6px;
  display: block;
}

/* ============ 适用场景 ============ */
.scenario-section {
  background: var(--bg-dark);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.scenario-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 36px 28px;
  transition: all 0.3s;
}

.scenario-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.scenario-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(39, 200, 216, 0.25);
}

.scenario-card:hover::before {
  opacity: 1;
}

.scenario-num {
  font-family: var(--font-num);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  display: block;
}

.scenario-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.scenario-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============ 流程步骤 ============ */
.process-section {
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.process-section::after {
  content: "";
  position: absolute;
  bottom: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1), transparent 70%);
  pointer-events: none;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  counter-reset: step;
}

.step-item {
  position: relative;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 0.3s;
}

.step-item:hover {
  border-color: rgba(39, 200, 216, 0.3);
  box-shadow: var(--glow);
  transform: translateY(-3px);
}

.step-item::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-num);
  font-size: 2.2rem;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(39, 200, 216, 0.5);
  position: absolute;
  top: 16px;
  right: 20px;
  line-height: 1;
  opacity: 0.6;
}

.step-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(39, 200, 216, 0.08);
  border: 1px solid rgba(39, 200, 216, 0.15);
  margin-bottom: 18px;
}

.step-item h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.step-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ============ FAQ ============ */
.faq-section {
  background: var(--bg-dark);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.faq-item:hover {
  border-color: rgba(39, 200, 216, 0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
  user-select: none;
}

.faq-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(39, 200, 216, 0.1);
  border: 1px solid rgba(39, 200, 216, 0.2);
  color: var(--accent);
  font-size: 1rem;
  transition: transform 0.3s;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  margin: 0 24px;
  padding-left: 0;
  padding-right: 0;
  border-top: none;
  padding-top: 0;
  margin-top: -4px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ============ CTA尾区 ============ */
.cta-section {
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 88px 0;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(39, 200, 216, 0.1), transparent 70%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 2;
  max-width: 640px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.3;
}

.cta-inner p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.cta-inner .btn {
  font-size: 1rem;
  padding: 14px 40px;
}

/* ============ 返回首页条 ============ */
.back-home-bar {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
}

.back-home-bar a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.3s;
}

.back-home-bar a:hover {
  color: var(--accent);
  gap: 12px;
}

/* ============ 页脚 ============ */
.footer {
  background: #050C18;
  border-top: 1px solid rgba(120, 170, 255, 0.08);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  transition: color 0.3s;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-col p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid rgba(120, 170, 255, 0.08);
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }

  .category-layout {
    grid-template-columns: 220px 1fr;
    gap: 28px;
  }

  .features-grid {
    grid-template-columns: 1fr 1fr;
  }

  .feature-card:first-child {
    grid-column: span 2;
    grid-row: auto;
  }
}

@media (max-width: 768px) {
  section {
    padding: 56px 0;
  }

  .top-bar-inner {
    height: 32px;
  }

  .top-meta {
    display: none;
  }

  .nav-inner {
    height: 60px;
  }

  .logo {
    margin-right: 0;
  }

  .logo-main {
    font-size: 1.1rem;
  }

  .logo-sub {
    font-size: 0.62rem;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    background: var(--overlay);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 80px 32px 40px;
    margin: 0;
    z-index: 9998;
    transition: right 0.4s ease;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.5);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu .nav-link {
    display: block;
    padding: 16px 0;
    font-size: 1.05rem;
    border-bottom: 1px solid rgba(120, 170, 255, 0.08);
    color: var(--text-secondary);
  }

  .nav-menu .nav-link.active {
    color: #fff;
  }

  .nav-menu .nav-link::after {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .category-hero {
    height: 320px;
  }

  .category-layout {
    grid-template-columns: 1fr;
  }

  .category-sidebar {
    position: static;
    padding: 16px;
  }

  .category-sidebar h3 {
    margin-bottom: 12px;
    font-size: 0.9rem;
  }

  .category-menu {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .category-menu li {
    margin: 0;
    flex-shrink: 0;
  }

  .category-menu a {
    padding: 8px 16px;
    border-left: none;
    border-radius: 999px;
    white-space: nowrap;
    font-size: 0.85rem;
    border: 1px solid var(--border);
  }

  .category-menu a.active {
    border-left: none;
    border-color: rgba(39, 200, 216, 0.4);
  }

  .sidebar-card {
    display: none;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feature-card:first-child {
    grid-column: auto;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 16px;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .section-head h2 {
    font-size: 1.35rem;
  }

  .category-info-bar {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }

  .back-home-bar a {
    font-size: 0.88rem;
  }
}

/* ============ 焦点可访问性 ============ */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 模板脚注（不参与页面呈现） */