```css

/* ===== 全局重置与设计变量 ===== */
:root{
  --bg-light:#F8FAFC; 
  --bg-card:#FFFFFF; 
  --bg-deep:#0F172A; 
  --text-primary:#1E293B;
  --text-secondary:#334155;
  --text-muted:#475569; 
  --text-on-dark:#F1F5F9; 
  --text-heading-dark:#FFFFFF;
  --brand:#1E293B;
  --brand-accent:#F59E0B; 
  --brand-accent-rgb:245,158,11;
  --border-light:#E2E8F0;
  --shadow-sm:0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.03);
  --radius:16px;
  --radius-sm:12px;
  --transition:0.25s cubic-bezier(0.4,0,0.2,1);
  --navbar-height:72px;
  --font-sans:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif:Georgia, 'Times New Roman', serif;
}

/* 暗黑模式变量 */
[data-theme="dark"]{
  --bg-light:#0B1120;
  --bg-card:#1E293B;
  --text-primary:#E2E8F0;
  --text-secondary:#CBD5E1;
  --text-muted:#94A3B8;
  --text-on-dark:#F8FAFC;
  --text-heading-dark:#FFFFFF;
  --brand:#0F172A;
  --brand-accent:#FBBF24;
  --brand-accent-rgb:251,191,36;
  --border-light:#334155;
  --shadow-sm:0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:0 4px 6px rgba(0,0,0,0.4);
  --shadow-lg:0 10px 15px rgba(0,0,0,0.5);
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  text-rendering:optimizeLegibility;
}

body{
  font-family:var(--font-sans);
  background-color:var(--bg-light);
  color:var(--text-primary);
  line-height:1.7;
  font-size:16px;
  transition:background-color 0.4s ease, color 0.3s ease;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* ===== 排版 ===== */
h1,h2,h3,h4,h5,h6{
  color:var(--text-primary);
  font-weight:700;
  line-height:1.3;
  letter-spacing:-0.01em;
  margin-bottom:0.5em;
  transition:color 0.3s ease;
}

h1{ font-size:clamp(2rem, 5vw, 3.2rem); }
h2{ font-size:clamp(1.6rem, 3.5vw, 2.4rem); margin-top:0.8em; }
h3{ font-size:clamp(1.3rem, 2.5vw, 1.6rem); }
h4{ font-size:1.15rem; }

p{
  color:var(--text-primary);
  margin-bottom:1.2em;
  line-height:1.8;
}

a{
  color:#B45309;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 0.25s ease, border-color 0.25s ease;
  font-weight:500;
}

[data-theme="dark"] a{
  color:#FBBF24;
}

a:hover{
  border-bottom-color:currentColor;
}

ul,ol{
  padding-left:1.5rem;
  margin-bottom:1rem;
}

li{
  margin-bottom:0.4rem;
  line-height:1.8;
}

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

/* ===== 布局容器 ===== */
.container{
  width:100%;
  max-width:1280px;
  margin:0 auto;
  padding:0 clamp(16px, 4vw, 32px);
}

/* ===== 工具类 ===== */
.text-muted{ color:var(--text-muted); }
.text-secondary{ color:var(--text-secondary); }
.text-accent{ color:var(--brand-accent); }
.text-center{ text-align:center; }
.flex-between{ 
  display:flex; 
  justify-content:space-between; 
  align-items:center; 
  flex-wrap:wrap; 
  gap:1rem;
}
.mt-2{ margin-top:2rem; }
.mb-2{ margin-bottom:2rem; }
.mt-4{ margin-top:4rem; }
.mb-4{ margin-bottom:4rem; }
.no-underline{ text-decoration:none !important; }
.no-underline:hover{ border-bottom:none !important; }

/* ===== 卡片 ===== */
.card{
  background-color:var(--bg-card);
  border:1px solid var(--border-light);
  border-radius:var(--radius);
  padding:2rem;
  box-shadow:var(--shadow-sm);
  transition:transform 0.3s var(--transition), box-shadow 0.3s var(--transition), background-color 0.3s ease, border-color 0.3s ease;
  position:relative;
  overflow:hidden;
}

.card::before{
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:linear-gradient(90deg, transparent, rgba(var(--brand-accent-rgb),0.5), transparent);
  opacity:0;
  transition:opacity 0.4s ease;
}

.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(var(--brand-accent-rgb),0.3);
}

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

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:0.5rem;
  background-color:var(--brand-accent);
  color:#1E293B;
  font-weight:600;
  padding:0.75rem 1.8rem;
  border-radius:50px;
  border:none;
  cursor:pointer;
  font-size:1rem;
  transition:all 0.3s var(--transition);
  text-decoration:none;
  line-height:1.5;
  box-shadow:0 2px 8px rgba(var(--brand-accent-rgb),0.25);
  white-space:nowrap;
}

.btn:hover{
  filter:brightness(0.92);
  transform:translateY(-2px);
  box-shadow:0 4px 16px rgba(var(--brand-accent-rgb),0.35);
  border-bottom:none;
  color:#1E293B;
}

.btn:active{
  transform:translateY(0);
}

.btn-outline{
  background:transparent;
  border:2px solid var(--brand-accent);
  color:var(--brand-accent);
  box-shadow:none;
}

.btn-outline:hover{
  background:rgba(var(--brand-accent-rgb),0.1);
  color:var(--brand-accent);
  border-bottom:2px solid var(--brand-accent);
}

[data-theme="dark"] .btn-outline{
  color:#FBBF24;
  border-color:#FBBF24;
}

[data-theme="dark"] .btn-outline:hover{
  background:rgba(251,191,36,0.1);
}

.btn-white-outline{
  background:transparent;
  border:2px solid rgba(255,255,255,0.8);
  color:white;
  box-shadow:none;
}

.btn-white-outline:hover{
  background:rgba(255,255,255,0.1);
  border-color:white;
  color:white;
}

/* ===== 导航栏 ===== */
.navbar{
  position:sticky;
  top:0;
  z-index:1000;
  background-color:rgba(255,255,255,0.85);
  backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border-light);
  transition:background-color 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="dark"] .navbar{
  background-color:rgba(15,23,42,0.85);
}

.navbar.scrolled{
  box-shadow:0 4px 20px rgba(0,0,0,0.08);
}

.nav-container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0.5rem clamp(16px, 4vw, 32px);
  max-width:1280px;
  margin:0 auto;
  min-height:var(--navbar-height);
}

.logo{
  font-size:1.6rem;
  font-weight:800;
  color:var(--text-primary);
  display:flex;
  align-items:center;
  gap:0.3rem;
  letter-spacing:-0.02em;
  transition:color 0.3s ease;
  text-decoration:none !important;
  border-bottom:none !important;
}

.logo span{
  color:var(--brand-accent);
  font-weight:800;
}

.logo:hover{
  color:var(--text-primary);
  border-bottom:none;
}

.nav-menu{
  display:flex;
  gap:0.5rem;
  align-items:center;
  list-style:none;
}

.nav-menu a{
  color:var(--text-primary);
  font-weight:500;
  padding:0.5rem 1rem;
  border-radius:8px;
  border-bottom:none !important;
  transition:all 0.25s ease;
  font-size:0.95rem;
  position:relative;
}

.nav-menu a:hover{
  color:var(--brand-accent);
  background:rgba(var(--brand-accent-rgb),0.08);
}

.nav-menu a::after{
  content:'';
  position:absolute;
  bottom:4px;
  left:50%;
  transform:translateX(-50%);
  width:0;
  height:2px;
  background:var(--brand-accent);
  border-radius:2px;
  transition:width 0.3s ease;
}

.nav-menu a:hover::after{
  width:60%;
}

.search-wrap{
  display:flex;
  align-items:center;
  background:var(--bg-light);
  border-radius:50px;
  padding:0.35rem 0.5rem 0.35rem 1rem;
  border:1px solid var(--border-light);
  transition:all 0.3s ease;
  flex:0 1 auto;
  min-width:0;
}

.search-wrap:focus-within{
  border-color:var(--brand-accent);
  box-shadow:0 0 0 3px rgba(var(--brand-accent-rgb),0.15);
  background:var(--bg-card);
}

.search-wrap input{
  border:none;
  background:transparent;
  padding:0.3rem 0.5rem;
  outline:none;
  color:var(--text-primary);
  width:clamp(80px, 12vw, 160px);
  font-size:0.9rem;
}

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

.search-wrap button{
  background:none;
  border:none;
  cursor:pointer;
  color:var(--text-primary);
  font-size:1.1rem;
  padding:0.3rem 0.6rem;
  border-radius:50%;
  transition:all 0.25s ease;
  line-height:1;
}

.search-wrap button:hover{
  color:var(--brand-accent);
  transform:scale(1.1);
}

.theme-toggle{
  background:var(--bg-light);
  border:1px solid var(--border-light);
  border-radius:50px;
  padding:0.4rem 0.9rem;
  cursor:pointer;
  font-size:0.9rem;
  font-weight:500;
  color:var(--text-primary);
  transition:all 0.3s ease;
  display:flex;
  align-items:center;
  gap:0.3rem;
  white-space:nowrap;
}

.theme-toggle:hover{
  border-color:var(--brand-accent);
  background:rgba(var(--brand-accent-rgb),0.08);
  transform:translateY(-1px);
}

/* ===== Hero 区域 ===== */
.hero{
  background:linear-gradient(135deg, #1E293B 0%, #0F172A 50%, #111827 100%);
  padding:clamp(4rem, 8vw, 7rem) 0;
  margin-bottom:2rem;
  color:white;
  position:relative;
  overflow:hidden;
}

[data-theme="dark"] .hero{
  background:linear-gradient(135deg, #0F172A 0%, #0B1120 50%, #020617 100%);
}

.hero::before{
  content:'';
  position:absolute;
  top:-50%;
  right:-20%;
  width:60%;
  height:120%;
  background:radial-gradient(circle, rgba(var(--brand-accent-rgb),0.08) 0%, transparent 70%);
  pointer-events:none;
}

.hero::after{
  content:'';
  position:absolute;
  bottom:-30%;
  left:-10%;
  width:50%;
  height:80%;
  background:radial-gradient(circle, rgba(59,130,246,0.06) 0%, transparent 70%);
  pointer-events:none;
}

.hero-content{
  max-width:820px;
  position:relative;
  z-index:2;
}

.hero h1{
  color:white;
  font-size:clamp(2rem, 5vw, 3.5rem);
  margin-bottom:1rem;
  font-weight:800;
  line-height:1.2;
  text-shadow:0 2px 20px rgba(0,0,0,0.3);
}

.hero p{
  color:rgba(226,232,240,0.95);
  font-size:clamp(1rem, 2vw, 1.2rem);
  line-height:1.8;
  margin-bottom:2rem;
  max-width:650px;
}

.hero-badge{
  display:inline-flex;
  align-items:center;
  gap:0.5rem;
  background:rgba(251,191,36,0.12);
  color:#FDE68A;
  padding:0.4rem 1.2rem;
  border-radius:50px;
  font-weight:500;
  border:1px solid rgba(251,191,36,0.2);
  margin-bottom:1.5rem;
  backdrop-filter:blur(10px);
  font-size:0.9rem;
  letter-spacing:0.02em;
}

.hero-badge::before{
  content:'✦';
  color:var(--brand-accent);
}

.hero-actions{
  display:flex;
  gap:1rem;
  margin-top:2.5rem;
  flex-wrap:wrap;
}

/* ===== 区块通用 ===== */
.section{
  padding:clamp(3rem, 6vw, 5rem) 0;
}

.section-title{
  margin-bottom:2.5rem;
  border-left:5px solid var(--brand-accent);
  padding-left:1.2rem;
  position:relative;
}

.section-title::after{
  content:'';
  position:absolute;
  bottom:-8px;
  left:1.2rem;
  width:40px;
  height:3px;
  background:linear-gradient(90deg, var(--brand-accent), transparent);
  border-radius:3px;
}

/* ===== 网格布局 ===== */
.grid-4{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:1.5rem;
}

.grid-3{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1.5rem;
}

.grid-2{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:1.5rem;
}

/* ===== 文章卡片 ===== */
.article-card{
  display:flex;
  flex-direction:column;
  height:100%;
  transition:transform 0.3s var(--transition), box-shadow 0.3s var(--transition);
}

.article-card .date{
  color:var(--text-muted);
  font-size:0.85rem;
  font-weight:500;
  text-transform:uppercase;
  letter-spacing:0.05em;
  margin-bottom:0.5rem;
  display:inline-flex;
  align-items:center;
  gap:0.4rem;
}

.article-card .date::before{
  content:'';
  display:inline-block;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--brand-accent);
}

.article-card h4{
  margin:0.5rem 0 0.8rem;
  font-size:1.1rem;
  line-height:1.4;
  transition:color 0.3s ease;
}

.article-card p{
  font-size:0.95rem;
  color:var(--text-secondary);
  flex-grow:1;
  margin-bottom:1rem;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

.article-card .read-more{
  color:var(--brand-accent);
  font-weight:600;
  font-size:0.9rem;
  display:inline-flex;
  align-items:center;
  gap:0.3rem;
  border-bottom:none;
  transition:gap 0.3s ease;
}

.article-card .read-more:hover{
  gap:0.6rem;
  border-bottom:none;
}

/* ===== FAQ 样式 ===== */
details{
  background:var(--bg-card);
  border:1px solid var(--border-light);
  border-radius:var(--radius-sm);
  padding:1.2rem 1.5rem;
  margin-bottom:0.8rem;
  transition:all 0.3s ease;
  box-shadow:var(--shadow-sm);
}

details:hover{
  border-color:rgba(var(--brand-accent-rgb),0.3);
  box-shadow:var(--shadow-md);
}

details[open]{
  border-color:var(--brand-accent);
  box-shadow:0 0 0 3px rgba(var(--brand-accent-rgb),0.1);
}

summary{
  font-weight:600;
  cursor:pointer;
  color:var(--text-primary);
  list-style:none;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:1rem;
  font-size:1rem;
  line-height:1.6;
  transition:color 0.3s ease;
}

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

summary::after{
  content:"+";
  color:var(--brand-accent);
  font-weight:700;
  font-size:1.4rem;
  line-height:1;
  transition:transform 0.3s ease;
  flex-shrink:0;
}

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

details p{
  margin-top:1rem;
  color:var(--text-secondary);
  padding-top:0.8rem;
  border-top:1px dashed var(--border-light);
  font-size:0.95rem;
}

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

th,td{
  padding:0.9rem 1.2rem;
  text-align:left;
  border-bottom:1px solid var(--border-light);
  color:var(--text-primary);
  font-size:0.95rem;
}

th{
  background-color:rgba(var(--brand-accent-rgb),0.06);
  font-weight:600;
  color:var(--text-primary);
  text-transform:uppercase;
  font-size:0.85rem;
  letter-spacing:0.03em;
}

tr:last-child td{
  border-bottom:none;
}

tr:hover td{
  background-color:rgba(var(--brand-accent-rgb),0.02);
}

/* ===== 滚动动画 ===== */
.reveal{
  opacity:0;
  transform:translateY(30px);
  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);
}

.stagger-1{ transition-delay:0.1s; }
.stagger-2{ transition-delay:0.2s; }
.stagger-3{ transition-delay:0.3s; }
.stagger-4{ transition-delay:0.4s; }

/* ===== Footer ===== */
footer{
  background-color:#1E293B;
  color:#CBD5E1;
  padding:clamp(3rem, 5vw, 4rem) 0 2rem;
  margin-top:4rem;
  position:relative;
}

[data-theme="dark"] footer{
  background-color:#0B1120;
}

footer a{
  color:#94A3B8;
  transition:color 0.3s ease;
  border-bottom:none;
}

footer a:hover{
  color:#FDE68A;
  border-bottom:none;
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:2.5rem;
  margin-bottom:2.5rem;
}

.footer-grid h4{
  color:white;
  margin-bottom:1rem;
  font-size:1.1rem;
}

.footer-grid p{
  color:#94A3B8;
  font-size:0.95rem;
  line-height:1.7;
}

.footer-grid a{
  display:inline-block;
  margin-bottom:0.6rem;
  font-size:0.95rem;
}

.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.1);
  padding-top:2rem;
  text-align:center;
  color:#94A3B8;
  font-size:0.9rem;
}

.footer-bottom p{
  color:#94A3B8;
  margin-bottom:0;
}

/* ===== 返回顶部按钮 ===== */
#backTop{
  position:fixed;
  bottom:30px;
  right:30px;
  background:var(--brand-accent);
  border:none;
  border-radius:50px;
  padding:10px 18px;
  font-weight:700;
  color:#1E293B;
  cursor:pointer;
  box-shadow:0 4px 15px rgba(var(--brand-accent-rgb),0.3);
  z-index:999;
  transition:all 0.3s ease;
  opacity:0;
  visibility:hidden;
  transform:translateY(20px);
  font-size:1.1rem;
  line-height:1;
}

#backTop.show{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

#backTop:hover{
  transform:translateY(-3px) scale(1.05);
  box-shadow:0 6px 20px rgba(var(--brand-accent-rgb),0.4);
}

/* ===== 品牌区 ===== */
.brand-section{
  background:var(--bg-card);
  border-radius:var(--radius);
  padding:clamp(2rem, 4vw, 3.5rem);
  box-shadow:var(--shadow-md);
  margin-bottom:2rem;
}

.brand-icon{
  width:60px;
  height:60px;
  border-radius:16px;
  background:linear-gradient(135deg, var(--brand-accent), rgba(var(--brand-accent-rgb),0.6));
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.8rem;
  margin-bottom:1rem;
  box-shadow:0 4px 12px rgba(var(--brand-accent-rgb),0.2);
}

/* ===== 统计数字 ===== */
.stat-number{
  font-size:2.2rem;
  font-weight:800;
  color:var(--brand-accent);
  line-height:1.2;
}

.stat-label{
  font-size:0.9rem;
  color:var(--text-muted);
  margin-top:0.3rem;
}

/* ===== 合作伙伴/信任徽章 ===== */
.trust-badge{
  display:inline-flex;
  align-items:center;
  gap:0.5rem;
  background:var(--bg-card);
  border:1px solid var(--border-light);
  padding:0.5rem 1.2rem;
  border-radius:50px;
  font-size:0.85rem;
  color:var(--text-secondary);
  box-shadow:var(--shadow-sm);
  transition:all 0.3s ease;
}

.trust-badge:hover{
  border-color:var(--brand-accent);
  transform:translateY(-2px);
  box-shadow:var(--shadow-md);
}

/* ===== 播放列表 ===== */
.video-card{
  position:relative;
  border-radius:var(--radius);
  overflow:hidden;
  cursor:pointer;
  background:var(--bg-card);
  box-shadow:var(--shadow-sm);
  transition:transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover{
  transform:translateY(-4px) scale(1.02);
  box-shadow:var(--shadow-lg);
}

.video-thumbnail{
  aspect-ratio:16/9;
  background:linear-gradient(135deg, #1E293B, #334155);
  display:flex;
  align-items:center;
  justify-content:center;
  color:white;
  font-size:3rem;
  position:relative;
}

.video-thumbnail::after{
  content:'▶';
  width:60px;
  height:60px;
  background:rgba(255,255,255,0.2);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  backdrop-filter:blur(10px);
  transition:all 0.3s ease;
}

.video-card:hover .video-thumbnail::after{
  background:rgba(var(--brand-accent-rgb),0.8);
  transform:scale(1.1);
}

.video-info{
  padding:1.2rem;
}

.video-info h4{
  font-size:1rem;
  margin-bottom:0.3rem;
}

.video-meta{
  font-size:0.85rem;
  color:var(--text-muted);
}

/* ===== 评分 ===== */
.rating{
  display:inline-flex;
  align-items:center;
  gap:0.2rem;
  color:var(--brand-accent);
  font-weight:600;
}

.rating-stars{
  letter-spacing:2px;
  font-size:0.9rem;
}

/* ===== 标签 ===== */
.tag{
  display:inline-block;
  background:rgba(var(--brand-accent-rgb),0.1);
  color:var(--brand-accent);
  padding:0.2rem 0.8rem;
  border-radius:20px;
  font-size:0.8rem;
  font-weight:500;
  margin-right:0.4rem;
  margin-bottom:0.4rem;
  transition:all 0.3s ease;
}

.tag:hover{
  background:var(--brand-accent);
  color:#1E293B;
}

/* ===== CTA 区块 ===== */
.cta-section{
  background:linear-gradient(135deg, var(--brand) 0%, #0F172A 100%);
  border-radius:var(--radius);
  padding:clamp(2.5rem, 5vw, 4rem);
  color:white;
  text-align:center;
  position:relative;
  overflow:hidden;
}

.cta-section::before{
  content:'';
  position:absolute;
  top:-50%;
  left:-20%;
  width:70%;
  height:200%;
  background:radial-gradient(circle, rgba(var(--brand-accent-rgb),0.1) 0%, transparent 60%);
}

.cta-section h2{
  color:white;
  margin-bottom:1rem;
}

.cta-section p{
  color:rgba(255,255,255,0.8);
  max-width:600px;
  margin:0 auto 2rem;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px){
  .grid-4{
    grid-template-columns:repeat(3, 1fr);
  }
  
  .grid-3{
    grid-template-columns:repeat(2, 1fr);
  }
  
  .footer-grid{
    grid-template-columns:repeat(2, 1fr);
    gap:1.5rem;
  }
}

@media (max-width: 768px){
  body{
    font-size:15px;
  }
  
  .nav-container{
    padding:0.5rem 1rem;
    flex-wrap:wrap;
    gap:0.5rem;
  }
  
  .nav-menu{
    display:none;
    position:fixed;
    top:var(--navbar-height);
    left:0;
    right:0;
    background:var(--bg-card);
    flex-direction:column;
    padding:1rem;
    box-shadow:var(--shadow-lg);
    border-bottom:1px solid var(--border-light);
    animation:slideDown 0.3s ease;
  }
  
  .nav-menu.active{
    display:flex;
  }
  
  .nav-menu a{
    padding:0.8rem 1rem;
    width:100%;
    text-align:center;
  }
  
  .search-wrap{
    order:3;
    width:100%;
    margin-top:0.5rem;
  }
  
  .search-wrap input{
    width:100%;
  }
  
  .theme-toggle{
    padding:0.3rem 0.7rem;
    font-size:0.8rem;
  }
  
  .grid-4{
    grid-template-columns:repeat(2, 1fr);
  }
  
  .grid-3{
    grid-template-columns:1fr;
  }
  
  .grid-2{
    grid-template-columns:1fr;
  }
  
  .hero{
    padding:3rem 0;
  }
  
  .hero h1{
    font-size:2rem;
  }
  
  .hero-actions{
    flex-direction:column;
    gap:0.8rem;
  }
  
  .hero-actions .btn{
    width:100%;
  }
  
  .footer-grid{
    grid-template-columns:1fr;
    gap:2rem;
  }
  
  #backTop{
    bottom:20px;
    right:20px;
    padding:8px 14px;
  }
  
  .card{
    padding:1.5rem;
  }
  
  .section-title{
    font-size:1.4rem;
  }
  
  .brand-section{
    padding:1.5rem;
  }
  
  .cta-section{
    padding:2rem 1.5rem;
  }
  
  table{
    font-size:0.85rem;
  }
  
  th,td{
    padding:0.7rem;
  }
  
  details{
    padding:1rem;
  }
  
  summary{
    font-size:0.95rem;
  }
}

@media (max-width: 480px){
  .grid-4{
    grid-template-columns:1fr;
  }
  
  .logo{
    font-size:1.3rem;
  }
  
  .container{
    padding:0 12px;
  }
  
  .hero h1{
    font-size:1.7rem;
  }
  
  .hero p{
    font-size:0.95rem;
  }
  
  .btn{
    padding:0.6rem 1.2rem;
    font-size:0.9rem;
  }
  
  .stat-number{
    font-size:1.6rem;
  }
}

/* ===== 汉堡菜单 ===== */
.menu-toggle{
  display:none;
  background:none;
  border:none;
  cursor:pointer;
  padding:0.5rem;
  border-radius:8px;
  transition:background 0.3s ease;
}

.menu-toggle:hover{
  background:rgba(var(--brand-accent-rgb),0.1);
}

.menu-toggle .bar{
  display:block;
  width:24px;
  height:2px;
  background:var(--text-primary);
  margin:5px 0;
  transition:all 0.3s ease;
  border-radius:2px;
}

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

.menu-toggle.active .bar:nth-child(2){
  opacity:0;
}

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

@media (max-width: 768px){
  .menu-toggle{
    display:block;
  }
}

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

@keyframes fadeInUp{
  from{
    opacity:0;
    transform:translateY(20px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}

@keyframes pulse{
  0%,100%{
    opacity:1;
  }
  50%{
    opacity:0.6;
  }
}

.animate-fade-in-up{
  animation:fadeInUp 0.6s ease both;
}

/* ===== 暗色模式额外调整 ===== */
[data-theme="dark"] .card{
  background-color:var(--bg-card);
  border-color:var(--border-light);
}

[data-theme="dark"] .navbar{
  background-color:rgba(15,23,42,0.85);
  border-bottom-color:rgba(255,255,255,0.05);
}

[data-theme="dark"] .search-wrap{
  background:rgba(255,255,255,0.05);
  border-color:rgba(255,255,255,0.1);
}

[data-theme="dark"] .search-wrap input{
  color:var(--text-on-dark);
}

[data-theme="dark"] .search-wrap input::placeholder{
  color:var(--text-muted);
}

[data-theme="dark"] .theme-toggle{
  background:rgba(255,255,255,0.05);
  border-color:rgba(255,255,255,0.1);
  color:var(--text-on-dark);
}

[data-theme="dark"] .card:hover{
  border-color:rgba(251,191,36,0.3);
}

[data-theme="dark"] .hero{
  background:linear-gradient(135deg, #0F172A 0%, #0B1120 50%, #020617 100%);
}

[data-theme="dark"] footer{
  background-color:#0B1120;
}

[data-theme="dark"] .footer-bottom{
  border-top-color:rgba(255,255,255,0.08);
}

[data-theme="dark"] details{
  background-color:var(--bg-card);
}

[data-theme="dark"] details[open]{
  border-color:var(--brand-accent);
}

[data-theme="dark"] summary{
  color:var(--text-on-dark);
}

[data-theme="dark"] .btn-outline{
  border-color:#FBBF24;
  color:#FBBF24;
}

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

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

::-webkit-scrollbar-thumb{
  background:linear-gradient(180deg, var(--brand-accent), rgba(var(--brand-accent-rgb),0.5));
  border-radius:6px;
  border:2px solid var(--bg-light);
}

::-webkit-scrollbar-thumb:hover{
  background:var(--brand-accent);
}

/* ===== 选中文本颜色 ===== */
::selection{
  background:rgba(var(--brand-accent-rgb),0.3);
  color:var(--text-primary);
}

/* ===== 焦点可见性 ===== */
:focus-visible{
  outline:3px solid rgba(var(--brand-accent-rgb),0.5);
  outline-offset:2px;
  border-radius:4px;
}

/* ===== 打印样式 ===== */
@media print{
  .navbar,
  .hero,
  #backTop,
  footer,
  .search-wrap{
    display:none !important;
  }
  
  body{
    background:white;
    color:black;
    font-size:12pt;
  }
  
  .card{
    box-shadow:none;
    border:1px solid #ddd;
    break-inside:avoid;
  }
  
  a{
    color:black !important;
    text-decoration:underline;
  }
  
  .container{
    max-width:100%;
    padding:0;
  }
}

/* ===== 性能优化 ===== */
@media (prefers-reduced-motion: reduce){
  *{
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.01ms !important;
    scroll-behavior:auto !important;
  }
  
  .reveal{
    opacity:1;
    transform:none;
  }
}

/* ===== 暗色模式自动检测 ===== */
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg-light:#0B1120;
    --bg-card:#1E293B;
    --text-primary:#E2E8F0;
    --text-secondary:#CBD5E1;
    --text-muted:#94A3B8;
    --border-light:#334155;
    --brand:#0F172A;
    --brand-accent:#FBBF24;
    --brand-accent-rgb:251,191,36;
  }
}

/* ===== 结束 ===== */
```