:root {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.82);
  --bg-footer: #1a2a3a;
  --text-primary: #17202a;
  --text-secondary: #334155;
  --text-muted: #4b5563;
  --text-inverse: #f1f5f9;
  --text-inverse-muted: #cbd5e1;
  --brand: #2b5a8c;
  --brand-dark: #1e3f63;
  --brand-light: #3b7bb5;
  --accent: #7c5cff;
  --accent-light: #a78bfa;
  --border: #d1d9e6;
  --border-glass: rgba(255, 255, 255, 0.5);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 32px rgba(43, 90, 140, 0.16);
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-blur: 16px;
  --radius: 12px;
  --radius-lg: 20px;
  --nav-height: 68px;
  --transition: 0.25s ease;
  --gradient-1: linear-gradient(135deg, #1e3f63 0%, #2b5a8c 55%, #7c5cff 100%);
  --gradient-2: linear-gradient(135deg, #2b5a8c 0%, #3b7bb5 50%, #a78bfa 100%);
  --gradient-3: linear-gradient(135deg, #1a2a3a 0%, #2b5a8c 50%, #3b7bb5 100%);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-nav: rgba(30, 41, 59, 0.82);
  --bg-footer: #0b1120;
  --text-primary: #f1f5f9;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --text-inverse: #f8fafc;
  --text-inverse-muted: #cbd5e1;
  --brand: #5b9bd5;
  --brand-dark: #3b7bb5;
  --brand-light: #7fb8e8;
  --accent: #a78bfa;
  --accent-light: #c4b5fd;
  --border: #334155;
  --border-glass: rgba(148, 163, 184, 0.22);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.55);
  --glass-bg: rgba(30, 41, 59, 0.5);
  --glass-border: rgba(148, 163, 184, 0.2);
  --gradient-1: linear-gradient(135deg, #0b1120 0%, #1e3f63 55%, #4c3d8f 100%);
  --gradient-2: linear-gradient(135deg, #1e3f63 0%, #2b5a8c 50%, #6d5bd0 100%);
  --gradient-3: linear-gradient(135deg, #0b1120 0%, #1a2a3a 50%, #2b5a8c 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 50% at 12% 8%, rgba(124, 92, 255, 0.10), transparent 60%),
    radial-gradient(ellipse 50% 45% at 88% 18%, rgba(59, 123, 181, 0.12), transparent 60%),
    radial-gradient(ellipse 55% 50% at 50% 100%, rgba(43, 90, 140, 0.08), transparent 65%);
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  color: var(--brand-dark);
  text-decoration: underline;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

h1,
h2,
h3,
h4 {
  color: var(--text-primary);
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: 2.2rem;
}

h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

p {
  color: var(--text-primary);
  margin-bottom: 1rem;
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 导航 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), var(--shadow);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color var(--transition), border-color var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  gap: 16px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo:hover {
  text-decoration: none;
  color: var(--brand);
}

.nav-logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.nav-logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 6px 18px rgba(43, 90, 140, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  position: relative;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--brand);
  text-decoration: none;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.theme-toggle:hover {
  background: var(--bg);
  transform: translateY(-1px);
  border-color: var(--brand-light);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 10px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
  border-color: var(--brand-light);
  box-shadow: 0 0 0 3px rgba(59, 123, 181, 0.15);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  width: 140px;
  padding: 4px 0;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1rem;
  padding: 0 4px;
  transition: transform var(--transition);
}

.search-box button:hover {
  transform: scale(1.15);
}

.mobile-menu-btn {
  display: none;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.2rem;
  transition: background-color var(--transition), transform var(--transition);
}

.mobile-menu-btn:hover {
  transform: scale(1.05);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 16px 0 8px;
  padding: 0 20px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.breadcrumb a {
  color: var(--brand);
}

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

/* ===== 首屏 ===== */
.hero-section {
  position: relative;
  text-align: center;
  padding: 56px 20px 24px;
  max-width: 900px;
  margin: 0 auto;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 520px;
  height: 320px;
  max-width: 90vw;
  background: radial-gradient(ellipse at center, rgba(124, 92, 255, 0.14), transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.hero-section h1 {
  font-size: 2.4rem;
  margin-bottom: 16px;
  background: linear-gradient(120deg, var(--text-primary) 20%, var(--brand) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-section .subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.stat-item {
  text-align: center;
  padding: 14px 22px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  min-width: 120px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  display: block;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== 锚点导航 ===== */
.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin: 24px 0;
  padding: 0 20px;
}

.anchor-nav a {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.anchor-nav a:hover {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #ffffff;
  border-color: transparent;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(43, 90, 140, 0.28);
}

/* ===== Banner 轮播 ===== */
.banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 24px auto;
  max-width: 1200px;
  height: 340px;
  background: var(--gradient-1);
  box-shadow: 0 18px 48px rgba(30, 63, 99, 0.28);
  isolation: isolate;
}

.banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 25%, rgba(255, 255, 255, 0.16), transparent 45%),
    radial-gradient(circle at 82% 78%, rgba(124, 92, 255, 0.28), transparent 50%);
  pointer-events: none;
  z-index: 1;
}

.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.8s ease, transform 1.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  background-size: cover;
  background-position: center;
}

.banner-slide.active {
  opacity: 1;
  transform: scale(1);
}

.banner-content {
  position: relative;
  text-align: center;
  color: #ffffff;
  z-index: 2;
  max-width: 700px;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.28);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.banner-content h2 {
  color: #ffffff;
  font-size: 2rem;
  margin-bottom: 12px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}

.banner-content p {
  color: #f1f5f9;
  font-size: 1.05rem;
  margin-bottom: 0;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.45);
}

.banner-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}

.banner-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: background 0.3s, transform 0.3s, width 0.3s;
}

.banner-dots span:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: scale(1.2);
}

.banner-dots span.active {
  background: #ffffff;
  width: 26px;
  border-radius: 6px;
}

/* ===== 通用区块 ===== */
.section {
  padding: 56px 0;
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-title h2 {
  display: inline-block;
  position: relative;
  padding-bottom: 12px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 64px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
}

/* ===== 卡片 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand-light);
}

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

.card h3 {
  color: var(--text-primary);
}

.card h4 {
  color: var(--text-primary);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card ul {
  list-style: none;
  padding: 0;
}

.card ul li {
  margin-bottom: 8px;
  font-size: 0.93rem;
}

.card ul li a {
  display: inline-block;
  transition: transform var(--transition), color var(--transition);
}

.card ul li a:hover {
  transform: translateX(4px);
  text-decoration: none;
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  border-radius: 12px;
  transition: transform var(--transition);
}

.card:hover .card-icon {
  transform: scale(1.08) rotate(-3deg);
}

/* ===== 文章列表 ===== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.article-item {
  position: relative;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 22px;
  overflow: hidden;
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.article-item::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.35s ease;
}

.article-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand-light);
}

.article-item:hover::after {
  transform: scaleY(1);
}

.article-item h4 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  transition: color var(--transition);
}

.article-item:hover h4 {
  color: var(--brand);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.article-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.read-more {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand);
  display: inline-block;
  transition: transform var(--transition), color var(--transition);
}

.read-more:hover {
  text-decoration: none;
  color: var(--accent);
  transform: translateX(4px);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.faq-item:hover {
  border-color: var(--brand-light);
  box-shadow: var(--shadow);
}

.faq-item.open {
  border-color: var(--brand);
  box-shadow: var(--shadow-hover);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: inherit;
  transition: background-color var(--transition), color var(--transition);
}

.faq-question:hover {
  background: rgba(59, 123, 181, 0.08);
}

.faq-question .arrow {
  transition: transform 0.3s ease, color var(--transition);
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item.open .faq-question {
  color: var(--brand);
}

.faq-item.open .faq-question .arrow {
  transform: rotate(180deg);
  color: var(--brand);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 22px;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 22px 18px;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== HowTo ===== */
.howto-steps {
  max-width: 860px;
  margin: 0 auto;
}

.step-item {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.step-item:hover {
  transform: translateY(-4px);
  border-color: var(--brand-light);
  box-shadow: var(--shadow-hover);
}

.step-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 6px 18px rgba(43, 90, 140, 0.32);
  transition: transform var(--transition);
}

.step-item:hover .step-number {
  transform: scale(1.1) rotate(-6deg);
}

.step-content h4 {
  margin-bottom: 6px;
}

.step-content p {
  font-size: 0.94rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ===== 表格 ===== */
.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  text-align: left;
}

th {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #ffffff;
  font-weight: 600;
}

td {
  color: var(--text-primary);
  background: var(--bg-card);
  transition: background-color var(--transition);
}

tbody tr:hover td {
  background: rgba(59, 123, 181, 0.08);
}

/* ===== EEAT ===== */
.eeat-section {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 20px 0;
  box-shadow: var(--shadow);
}

.eeat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}

.eeat-item {
  padding: 14px 16px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.35);
  border: 1px solid var(--border-glass);
  transition: transform var(--transition), box-shadow var(--transition);
}

[data-theme="dark"] .eeat-item {
  background: rgba(15, 23, 42, 0.35);
}

.eeat-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.eeat-item h4 {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 500;
}

.eeat-item p {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0;
}

/* ===== Footer ===== */
.footer {
  position: relative;
  background: var(--bg-footer);
  color: var(--text-inverse);
  padding: 56px 0 24px;
  margin-top: 56px;
  overflow: hidden;
  transition: background-color var(--transition), color var(--transition);
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--accent), var(--brand-light));
}

.footer::after {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.18), transparent 70%);
  pointer-events: none;
}

.footer a {
  color: var(--text-inverse-muted);
  text-decoration: none;
  transition: color var(--transition), transform var(--transition);
  display: inline-block;
}

.footer a:hover {
  color: #ffffff;
  text-decoration: none;
  transform: translateX(4px);
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer h4 {
  color: #ffffff;
  margin-bottom: 16px;
  font-size: 1rem;
  position: relative;
  padding-bottom: 10px;
}

.footer h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand-light), var(--accent));
}

.footer ul {
  list-style: none;
}

.footer li {
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.footer-bottom {
  position: relative;
  z-index: 1;
  text-align: center;
  padding-top: 32px;
  margin-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.85rem;
  color: var(--text-inverse-muted);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.footer-bottom p {
  color: var(--text-inverse-muted);
  margin-bottom: 0;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #ffffff;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  box-shadow: 0 8px 24px rgba(43, 90, 140, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, box-shadow 0.3s;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 14px 32px rgba(43, 90, 140, 0.55);
}

/* ===== 滚动动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.card-grid .fade-in:nth-child(2) {
  transition-delay: 0.08s;
}

.card-grid .fade-in:nth-child(3) {
  transition-delay: 0.16s;
}

.card-grid .fade-in:nth-child(4) {
  transition-delay: 0.24s;
}

.article-list .fade-in:nth-child(2) {
  transition-delay: 0.06s;
}

.article-list .fade-in:nth-child(3) {
  transition-delay: 0.12s;
}

.article-list .fade-in:nth-child(4) {
  transition-delay: 0.18s;
}

/* ===== 辅助类 ===== */
.text-muted {
  color: var(--text-muted);
}

.text-secondary {
  color: var(--text-secondary);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--brand), var(--accent));
  border-radius: 6px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--brand-dark), var(--brand));
}

/* ===== 选中文字 ===== */
::selection {
  background: rgba(124, 92, 255, 0.28);
  color: var(--text-primary);
}

/* ===== 焦点可见性 ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--brand-light);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-section h1 {
    font-size: 2rem;
  }

  .banner {
    height: 300px;
  }
}

@media (max-width: 860px) {
  h1 {
    font-size: 1.7rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-nav);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border-glass);
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
    animation: navDrop 0.28s ease;
  }

  .nav-links a {
    width: 100%;
    padding: 8px 0;
  }

  .mobile-menu-btn {
    display: block;
  }

  .search-box {
    display: none;
  }

  .banner {
    height: 260px;
    border-radius: 0;
    margin: 0;
    box-shadow: none;
  }

  .banner-content {
    padding: 20px 22px;
    border-radius: var(--radius);
  }

  .banner-content h2 {
    font-size: 1.4rem;
  }

  .banner-content p {
    font-size: 0.95rem;
  }

  .hero-section {
    padding: 40px 20px 16px;
  }

  .hero-section h1 {
    font-size: 1.6rem;
  }

  .hero-stats {
    gap: 16px;
  }

  .stat-item {
    padding: 12px 16px;
    min-width: 100px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .section {
    padding: 40px 0;
  }

  .card-grid,
  .article-list {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .step-item {
    flex-direction: column;
    gap: 12px;
  }

  .eeat-section {
    padding: 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .hero-section h1 {
    font-size: 1.4rem;
  }

  .hero-section .subtitle {
    font-size: 0.98rem;
  }

  .hero-stats {
    gap: 12px;
  }

  .stat-item {
    min-width: 88px;
    padding: 10px 12px;
  }

  .stat-number {
    font-size: 1.3rem;
  }

  .nav-logo span {
    font-size: 1.1rem;
  }

  .nav-logo svg {
    width: 30px;
    height: 30px;
  }

  .banner {
    height: 220px;
  }

  .banner-content h2 {
    font-size: 1.2rem;
  }

  .banner-content p {
    font-size: 0.88rem;
  }

  .anchor-nav a {
    font-size: 0.82rem;
    padding: 5px 12px;
  }

  .card,
  .article-item,
  .step-item {
    padding: 18px;
  }

  .faq-question {
    padding: 15px 16px;
    font-size: 0.94rem;
  }

  .faq-answer {
    padding: 0 16px;
  }

  .faq-item.open .faq-answer {
    padding: 0 16px 16px;
  }
}

/* ===== 动画定义 ===== */
@keyframes navDrop {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatSoft {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(124, 92, 255, 0.35);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(124, 92, 255, 0);
  }
}

/* ===== 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ===== 深色模式细节修正 ===== */
[data-theme="dark"] .card::before {
  background: linear-gradient(90deg, var(--brand), var(--accent));
}

[data-theme="dark"] .faq-question:hover {
  background: rgba(91, 155, 213, 0.12);
}

[data-theme="dark"] tbody tr:hover td {
  background: rgba(91, 155, 213, 0.12);
}

[data-theme="dark"] .banner-content {
  background: rgba(2, 6, 23, 0.42);
  border-color: rgba(148, 163, 184, 0.22);
}

[data-theme="dark"] .hero-section::before {
  background: radial-gradient(ellipse at center, rgba(167, 139, 250, 0.16), transparent 70%);
}

[data-theme="dark"] .footer::after {
  background: radial-gradient(circle, rgba(167, 139, 250, 0.16), transparent 70%);
}

/* ===== 打印样式 ===== */
@media print {
  .navbar,
  .banner,
  .back-to-top,
  .anchor-nav,
  .theme-toggle,
  .search-box,
  .mobile-menu-btn {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  .card,
  .article-item,
  .faq-item,
  .step-item,
  .eeat-section {
    box-shadow: none;
    border: 1px solid #cccccc;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: #ffffff;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}