/* ===== momo漫画 - 完整样式表 ===== */
/* 设计变量与色彩系统（高对比度、可访问性优先） */
:root {
  --bg-light: #f5f7fa;
  --bg-card: #ffffff;
  --bg-soft: #eef1f5;
  --text-primary: #1f2937;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --text-heading: #111827;
  --text-link: #1d4ed8;
  --text-footer: #e5e7eb;
  --brand-color: #f0b90b;
  --brand-dark: #b45309;
  --brand-light: #fcd34d;
  --accent: #7c3aed;
  --border-light: #d1d5db;
  --border-soft: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10);
  --nav-bg: rgba(255,255,255,0.88);
  --footer-bg: #1a2634;
  --btn-bg: #1f2937;
  --btn-text: #ffffff;
  --banner-overlay: linear-gradient(120deg, rgba(17,24,39,0.88) 0%, rgba(30,41,59,0.65) 50%, rgba(180,83,9,0.35) 100%);
  --glass-bg: rgba(255,255,255,0.65);
  --glass-border: rgba(255,255,255,0.35);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-full: 999px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-display: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
}

/* 暗黑模式（自动跟随系统） */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-light: #0d131a;
    --bg-card: #1a222c;
    --bg-soft: #141c25;
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-heading: #f8fafc;
    --text-link: #7aa7ff;
    --text-footer: #cbd5e1;
    --brand-color: #f0b90b;
    --brand-dark: #fcd34d;
    --border-light: #3f4a5a;
    --border-soft: #2d3748;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
    --nav-bg: rgba(13,19,26,0.85);
    --footer-bg: #0a0f14;
    --btn-bg: #e2e8f0;
    --btn-text: #0d131a;
    --banner-overlay: linear-gradient(120deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.65) 50%, rgba(0,0,0,0.45) 100%);
    --glass-bg: rgba(26,34,44,0.65);
    --glass-border: rgba(63,74,90,0.4);
  }
}

/* 手动暗色模式类（JS切换） */
.dark-mode {
  color-scheme: dark;
  --bg-light: #0d131a;
  --bg-card: #1a222c;
  --bg-soft: #141c25;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-heading: #f8fafc;
  --text-link: #7aa7ff;
  --border-light: #3f4a5a;
  --border-soft: #2d3748;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  --nav-bg: rgba(13,19,26,0.85);
  --footer-bg: #0a0f14;
  --btn-bg: #e2e8f0;
  --btn-text: #0d131a;
  --banner-overlay: linear-gradient(120deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.65) 50%, rgba(0,0,0,0.45) 100%);
  --glass-bg: rgba(26,34,44,0.65);
  --glass-border: rgba(63,74,90,0.4);
}

/* 基础重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scrollbar-width: thin;
  scrollbar-color: var(--brand-color) transparent;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4.5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.75;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

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

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

li {
  margin-bottom: 0.5rem;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--brand-color);
  border-radius: 4px;
}

::selection {
  background: var(--brand-color);
  color: #0d131a;
}

/* 容器 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
}

/* ============ 导航栏 ============ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-soft);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
  gap: 1rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.03);
  text-decoration: none;
}

.logo span {
  color: var(--brand-color);
  font-weight: 900;
}

.nav-links {
  display: flex;
  gap: 2rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--brand-color);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 0.15rem 0.4rem 0.15rem 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-box:focus-within {
  border-color: var(--brand-color);
  box-shadow: 0 0 0 3px rgba(240, 185, 11, 0.15);
}

.search-box input {
  border: none;
  background: transparent;
  color: var(--text-primary);
  padding: 0.5rem 0.25rem;
  outline: none;
  width: 180px;
  font-size: 0.9rem;
}

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

.search-box button {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: var(--radius-full);
  padding: 0.45rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: background 0.2s ease, transform 0.2s ease;
}

.search-box button:hover {
  background: var(--brand-color);
  color: #0d131a;
  transform: scale(1.02);
}

.theme-toggle {
  cursor: pointer;
  background: var(--bg-card);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.9rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s ease;
  line-height: 1;
}

.theme-toggle:hover {
  border-color: var(--brand-color);
  background: var(--bg-soft);
  transform: scale(1.05);
}

/* 移动端菜单 */
.mobile-menu-toggle {
  display: none;
}

.mobile-menu-icon {
  display: none;
  font-size: 1.75rem;
  cursor: pointer;
  color: var(--text-heading);
  line-height: 1;
  padding: 0.25rem;
  user-select: none;
  transition: transform 0.2s ease;
}

.mobile-menu-icon:hover {
  transform: scale(1.1);
}

/* ============ Banner ============ */
.banner {
  position: relative;
  background: var(--banner-overlay), 
    url('data:image/svg+xml;base64,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') no-repeat center center/cover;
  padding: 7rem 0;
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 50%, rgba(240, 185, 11, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 40%);
  animation: bannerGlow 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes bannerGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-2%, 2%) rotate(2deg); }
}

.banner-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  padding: 0 1.5rem;
}

.banner h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  color: #ffffff;
  text-shadow: 0 4px 20px rgba(0,0,0,0.5);
  margin-bottom: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  animation: fadeInUp 0.8s ease;
}

.banner p {
  color: #f0f4fa;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  text-shadow: 0 2px 8px rgba(0,0,0,0.4);
  margin-bottom: 2rem;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 400;
  animation: fadeInUp 0.8s ease 0.15s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn-primary {
  display: inline-block;
  background: var(--brand-color);
  color: #0b0e14;
  font-weight: 700;
  padding: 1rem 2.5rem;
  border-radius: var(--radius-full);
  margin-top: 0.5rem;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(240, 185, 11, 0.3);
  text-decoration: none;
  letter-spacing: 0.01em;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.btn-primary:hover {
  background: #ffd966;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 30px rgba(240, 185, 11, 0.4);
  text-decoration: none;
}

/* ============ 区块标题 ============ */
.section-title {
  text-align: center;
  margin: 4rem 0 2.5rem;
  position: relative;
}

.section-title h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  border-bottom: 3px solid var(--brand-color);
  display: inline-block;
  padding-bottom: 0.75rem;
  margin-bottom: 0;
  position: relative;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 40%;
  height: 3px;
  background: var(--brand-dark);
  border-radius: 3px;
}

/* ============ 卡片网格 ============ */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-soft);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-color), var(--brand-dark), var(--brand-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

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

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card h4 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ============ 文章列表 ============ */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.article-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--border-soft);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
}

.article-item::after {
  content: '';
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 60px;
  height: 60px;
  background: radial-gradient(circle, rgba(240, 185, 11, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  transition: transform 0.3s ease;
}

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

.article-item:hover::after {
  transform: scale(1.5);
}

.article-item h3 {
  font-size: 1.15rem;
  margin-bottom: 0.25rem;
  line-height: 1.4;
  transition: color 0.2s ease;
}

.article-item:hover h3 {
  color: var(--brand-dark);
}

.article-item .date {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-item .date::before {
  content: '📅';
  font-size: 0.9rem;
}

.article-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
  flex: 1;
}

.article-item a {
  font-weight: 600;
  font-size: 0.9rem;
  align-self: flex-start;
  color: var(--text-link);
  transition: all 0.2s ease;
}

.article-item a:hover {
  color: var(--brand-dark);
  padding-left: 0.25rem;
}

/* ============ FAQ ============ */
.faq-details {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 0.5rem 1.5rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--border-soft);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

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

.faq-details summary {
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  font-size: 1.05rem;
  padding: 0.75rem 0;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  user-select: none;
  transition: color 0.2s ease;
}

.faq-details summary::-webkit-details-marker {
  display: none;
}

.faq-details summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--brand-color);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-details[open] summary::after {
  transform: rotate(45deg);
}

.faq-details summary:hover {
  color: var(--brand-dark);
}

.faq-details p {
  margin-top: 0.5rem;
  padding-bottom: 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  border-top: 1px dashed var(--border-soft);
  padding-top: 1rem;
}

/* ============ 表格 ============ */
.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-soft);
}

.info-table th, .info-table td {
  padding: 1rem 1.25rem;
  border: 1px solid var(--border-soft);
  text-align: left;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.info-table th {
  background: var(--bg-soft);
  color: var(--text-heading);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.info-table tr:hover {
  background: var(--bg-soft);
}

/* ============ 页脚 ============ */
footer {
  background: var(--footer-bg);
  color: var(--text-footer);
  padding: 3.5rem 0 0;
  margin-top: 5rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-color), var(--brand-dark), var(--brand-color));
  opacity: 0.6;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-grid h4 {
  color: #ffffff;
  margin-bottom: 1.25rem;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-grid h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background: var(--brand-color);
  border-radius: 2px;
}

.footer-grid p {
  color: #cbd5e1;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-grid a {
  color: #cbd5e1;
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-grid a:hover {
  color: var(--brand-color);
  padding-left: 0.35rem;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid #2d3a4b;
  padding: 1.75rem 0;
  text-align: center;
  font-size: 0.9rem;
  color: #94a3b8;
}

.footer-bottom p {
  color: #94a3b8;
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
}

/* ============ 返回顶部 ============ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  border: none;
  z-index: 1000;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--brand-color);
  color: #0d131a;
  transform: translateY(-4px) scale(1.05);
}

/* ============ 滚动动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ============ 毛玻璃效果元素 ============ */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ============ 渐变文字 ============ */
.gradient-text {
  background: linear-gradient(135deg, var(--brand-color), var(--brand-dark), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ============ 响应式适配 ============ */
@media (max-width: 1024px) {
  .nav-links {
    gap: 1.25rem;
  }
  
  .search-box input {
    width: 140px;
  }
  
  .banner {
    padding: 5rem 0;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
  }
  
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--nav-bg);
    padding: 1rem 0;
    gap: 0.75rem;
    border-top: 1px solid var(--border-soft);
    margin-top: 0.75rem;
    backdrop-filter: blur(16px);
  }
  
  .mobile-menu-toggle:checked ~ .nav-links {
    display: flex;
    animation: slideDown 0.3s ease;
  }
  
  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  .mobile-menu-icon {
    display: block;
  }
  
  .search-box {
    display: none;
  }
  
  .nav-actions {
    gap: 0.5rem;
  }
  
  .banner {
    padding: 4rem 0;
  }
  
  .banner h1 {
    font-size: 2.2rem;
  }
  
  .banner p {
    font-size: 1.1rem;
  }
  
  .grid-cards {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .article-list {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .section-title {
    margin: 3rem 0 1.75rem;
  }
  
  .back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.85rem;
  }
  
  .nav-container {
    padding: 0.65rem 0.85rem;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .theme-toggle {
    padding: 0.35rem 0.7rem;
    font-size: 0.85rem;
  }
  
  .banner {
    padding: 3.5rem 0;
  }
  
  .btn-primary {
    padding: 0.85rem 2rem;
    font-size: 1rem;
  }
  
  .card {
    padding: 1.5rem 1.25rem;
  }
  
  .article-item {
    padding: 1.25rem 1rem;
  }
  
  .faq-details {
    padding: 0.25rem 1rem;
  }
  
  .info-table th, .info-table td {
    padding: 0.75rem;
    font-size: 0.85rem;
  }
}

/* ============ 打印样式 ============ */
@media print {
  .navbar, .back-to-top, .theme-toggle, .search-box, .btn-primary {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .container {
    max-width: 100%;
  }
  
  .banner {
    padding: 2rem 0;
    background: #f0f0f0 !important;
    color: black;
  }
  
  .banner h1, .banner p {
    color: black;
    text-shadow: none;
  }
}

/* ============ 无障碍支持 ============ */
@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;
  }
  
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* 焦点可见性 */
:focus-visible {
  outline: 3px solid var(--brand-color);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ 辅助工具类 ============ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }
.py-1 { padding-top: 1rem; padding-bottom: 1rem; }
.py-2 { padding-top: 2rem; padding-bottom: 2rem; }
.py-3 { padding-top: 3rem; padding-bottom: 3rem; }

.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 1rem; }
.gap-2 { gap: 2rem; }

.hidden { display: none; }

/* 渐变边框 */
.gradient-border {
  position: relative;
  border: none;
  background: var(--bg-card);
  background-clip: padding-box;
}

.gradient-border::before {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  border-radius: inherit;
  padding: 2px;
  background: linear-gradient(135deg, var(--brand-color), var(--accent));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* 徽章 */
.badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--brand-color), var(--brand-dark));
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

/* 标签 */
.tag {
  display: inline-block;
  background: var(--bg-soft);
  color: var(--text-secondary);
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  border: 1px solid var(--border-soft);
  transition: all 0.2s ease;
  cursor: pointer;
}

.tag:hover {
  border-color: var(--brand-color);
  color: var(--brand-dark);
  background: var(--bg-card);
}

/* 分隔线 */
.divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-color), var(--brand-dark));
  border-radius: 3px;
  margin: 1.5rem auto;
}

/* 骨架屏动画 */
@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

.skeleton {
  background: linear-gradient(90deg, var(--bg-soft) 25%, var(--bg-card) 50%, var(--bg-soft) 75%);
  background-size: 1000px 100%;
  animation: shimmer 1.5s infinite linear;
  border-radius: 8px;
}

/* 波浪装饰 */
.wave-divider {
  position: relative;
  height: 60px;
  overflow: hidden;
}

.wave-divider::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxNDQwIDYwIj48cGF0aCBkPSJNMCAzMEwxODAgMTBMMzYwIDI1TDU0MCAxMEw3MjAgMzBMOTAwIDEwTDEwODAgMjVMMTI2MCAxMEwxNDQwIDMwVjYwSDBWMzBaIiBmaWxsPSIjZmZmIi8+PC9zdmc+') no-repeat bottom center;
  background-size: cover;
}

/* 发光效果 */
.glow-effect {
  position: relative;
}

.glow-effect::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--brand-color), var(--accent));
  z-index: -1;
  filter: blur(8px);
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.glow-effect:hover::before {
  opacity: 0.8;
}

/* 工具提示 */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-heading);
  color: var(--bg-card);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  pointer-events: none;
  z-index: 10;
}

.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
  bottom: calc(100% + 8px);
}

/* 统计数字动画 */
.counter {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--brand-color);
}

/* 特色卡片 hover 效果 */
.feature-card {
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card img {
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover img {
  transform: scale(1.05);
}

.feature-card .overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: white;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.feature-card:hover .overlay {
  transform: translateY(0);
}

/* 滚动进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-color), var(--brand-dark));
  z-index: 2000;
  transition: width 0.1s ease;
  width: 0;
}

/* 页面加载动画 */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-light);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
}

.loader-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--border-soft);
  border-top-color: var(--brand-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 2px dashed var(--border-light);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* 错误提示 */
.error-message {
  background: #fee2e2;
  color: #991b1b;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  border-left: 4px solid #dc2626;
  margin: 1rem 0;
}

.success-message {
  background: #dcfce7;
  color: #166534;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  border-left: 4px solid #16a34a;
  margin: 1rem 0;
}

/* 信息提示 */
.info-message {
  background: #dbeafe;
  color: #1e40af;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  border-left: 4px solid #2563eb;
  margin: 1rem 0;
}

/* ============ 深色模式下的额外适配 ============ */
.dark-mode .card,
.dark-mode .article-item,
.dark-mode .faq-details,
.dark-mode .info-table {
  background: var(--bg-card);
}

.dark-mode .search-box {
  background: var(--bg-card);
}

.dark-mode .theme-toggle {
  background: var(--bg-card);
}

.dark-mode .gradient-border {
  background: var(--bg-card);
}

.dark-mode .skeleton {
  background: linear-gradient(90deg, #1a222c 25%, #2d3748 50%, #1a222c 75%);
}

/* ============ 最终优化 ============ */
@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
  }
  
  .banner {
    padding: 8rem 0;
  }
}

/* 减少布局偏移 */
.card, .article-item, .faq-details {
  contain: layout style;
}

/* 性能优化：动画元素 */
@media (min-width: 769px) {
  .card, .article-item {
    will-change: transform;
  }
}