```css
/* ===== T41AV 主样式表 ===== */
/* 设计理念：深色高级质感 + 渐变光影 + 毛玻璃 + 微交互 */
/* 支持 Light / Dark 双主题 */

/* ---------- CSS 变量与主题 ---------- */
:root {
  /* 主色板 - 午夜蓝紫 */
  --primary-1: #6d28d9;
  --primary-2: #4f46e5;
  --primary-3: #9333ea;
  --accent-glow: rgba(109, 40, 217, 0.35);

  /* 渐变 */
  --grad-hero: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #4c1d95 100%);
  --grad-card: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  --grad-btn: linear-gradient(135deg, #7c3aed, #a855f7);
  --grad-btn-hover: linear-gradient(135deg, #6d28d9, #9333ea);

  /* 背景 */
  --bg-body: #0a0a0f;
  --bg-header: rgba(10, 10, 15, 0.8);
  --bg-card: rgba(20, 20, 30, 0.7);
  --bg-footer: #06060a;
  --bg-elevated: rgba(30, 30, 45, 0.9);

  /* 文本 */
  --text-primary: #f1f5f9;
  --text-secondary: #a1a1aa;
  --text-heading: #ffffff;
  --text-footer: #a1a1aa;
  --text-link: #c4b5fd;
  --text-btn: #ffffff;

  /* 边框与阴影 */
  --border-light: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 40px rgba(109, 40, 217, 0.25);
  --blur: 16px;

  /* 布局 */
  --radius: 16px;
  --radius-sm: 10px;
  --container-max: 1280px;
  --header-height: 72px;
}

/* 浅色主题 - 未使用 data-theme，默认深色；若需浅色可加 [data-theme="light"] */
[data-theme="light"] {
  --bg-body: #f4f4f8;
  --bg-header: rgba(255, 255, 255, 0.8);
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-footer: #e4e4e7;
  --bg-elevated: #ffffff;

  --text-primary: #1e1b2e;
  --text-secondary: #52525b;
  --text-heading: #1e1b2e;
  --text-footer: #3f3f46;
  --text-link: #4f46e5;
  --text-btn: #ffffff;

  --border-light: rgba(0, 0, 0, 0.08);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 40px rgba(79, 70, 229, 0.15);

  --grad-hero: linear-gradient(135deg, #e0e7ff, #c7d2fe, #ddd6fe);
}

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

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

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
  background-image: radial-gradient(ellipse at 20% 0%, rgba(109, 40, 217, 0.15) 0%, transparent 60%),
                    radial-gradient(ellipse at 80% 100%, rgba(79, 70, 229, 0.1) 0%, transparent 50%);
  background-attachment: fixed;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary-1), var(--primary-2));
  border-radius: 10px;
}

/* ---------- 排版 ---------- */
h1, h2, h3, h4, h5 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.8em;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff, #e9d5ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.4em;
}

[data-theme="light"] h1 {
  background: linear-gradient(135deg, #1e1b2e, #4f46e5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  position: relative;
  padding-bottom: 0.3em;
  margin-top: 1.5em;
  margin-bottom: 1em;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--grad-btn);
  border-radius: 4px;
}

h3 {
  font-size: 1.4rem;
  margin-bottom: 0.6em;
}

h4 {
  font-size: 1.1rem;
  opacity: 0.9;
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-3);
}

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

ul, ol {
  padding-left: 1.2rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.4rem;
}

/* ---------- 容器与布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 4rem 0;
}

/* ---------- 玻璃拟态工具类 ---------- */
.glass {
  background: var(--bg-card);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
}

.glass-strong {
  background: var(--bg-elevated);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
}

/* ---------- 头部导航 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.header.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
}

/* 品牌 Logo */
.brand {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(135deg, #a78bfa, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.brand span {
  font-weight: 300;
  opacity: 0.8;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.2s ease;
  border: none;
}

.nav-links a:hover {
  background: rgba(139, 92, 246, 0.15);
  color: #c4b5fd;
}

/* 图标按钮 */
.icon-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all 0.2s ease;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background: rgba(139, 92, 246, 0.2);
  transform: scale(1.05);
}

/* 菜单按钮（移动端） */
.menu-toggle {
  display: none;
  font-size: 1.8rem;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-light);
  border-radius: 40px;
  padding: 0.2rem 0.2rem 0.2rem 1rem;
  transition: all 0.3s ease;
  margin-left: 0.5rem;
}

.search-box:focus-within {
  border-color: var(--primary-2);
  box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.2);
}

.search-box input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  outline: none;
  font-size: 0.9rem;
  width: 100px;
  transition: width 0.3s ease;
}

.search-box input:focus {
  width: 160px;
}

.search-box button {
  background: var(--grad-btn);
  border: none;
  border-radius: 40px;
  color: white;
  padding: 0.4rem 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.85rem;
}

.search-box button:hover {
  transform: scale(1.02);
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

/* ---------- 移动端导航 ---------- */
@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-elevated);
    backdrop-filter: blur(24px);
    padding: 1rem 2rem;
    gap: 0.8rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow);
    align-items: stretch;
  }

  .nav-links.open {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .nav-links a {
    padding: 0.8rem 1rem;
    text-align: center;
    font-size: 1.1rem;
  }

  .search-box {
    margin: 0.5rem 0;
    width: 100%;
  }

  .search-box input {
    flex: 1;
    width: auto;
  }

  .search-box input:focus {
    width: auto;
  }

  .icon-btn {
    align-self: center;
  }
}

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

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 1.5rem 0 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.breadcrumb a {
  color: var(--text-link);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.breadcrumb a:hover {
  border-bottom-color: var(--text-link);
}

/* ---------- Hero 区域 ---------- */
.hero {
  position: relative;
  padding: 5rem 0 6rem;
  background: var(--grad-hero);
  border-radius: 0 0 40px 40px;
  overflow: hidden;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: float 8s ease-in-out infinite alternate;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  right: -10%;
  width: 60%;
  height: 100%;
  background: radial-gradient(circle, rgba(147, 51, 234, 0.2) 0%, transparent 70%);
  animation: float2 10s ease-in-out infinite alternate;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(5%, 10%) scale(1.1); }
}

@keyframes float2 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-10%, -5%) scale(1.2); }
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero h1 {
  margin-bottom: 0.5em;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.hero .lead {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: rgba(255, 255, 255, 0.85);
  max-width: 700px;
  margin: 0 auto 2rem;
  line-height: 1.8;
}

[data-theme="light"] .hero .lead {
  color: rgba(30, 27, 46, 0.8);
}

/* 按钮 */
.btn {
  display: inline-block;
  background: var(--grad-btn);
  color: var(--text-btn);
  padding: 0.9rem 2.2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.5);
  background: var(--grad-btn-hover);
}

.btn:hover::before {
  left: 100%;
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.8rem;
  margin: 2.5rem 0;
}

/* 毛玻璃卡片 */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius);
  padding: 1.8rem;
  border: 1px solid var(--border-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-btn);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(139, 92, 246, 0.3);
}

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

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
  background: linear-gradient(135deg, var(--text-heading), var(--text-link));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 卡片内图片占位 */
.svg-placeholder {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(79, 70, 229, 0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  border: 1px solid var(--border-light);
  font-weight: 600;
  letter-spacing: 1px;
  transition: all 0.3s ease;
  min-height: 100px;
}

.card:hover .svg-placeholder {
  transform: scale(1.02);
  border-color: rgba(139, 92, 246, 0.4);
}

/* ---------- 文章列表 ---------- */
.article-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: padding 0.3s ease;
}

.article-item:last-child {
  border-bottom: none;
}

.article-item:hover {
  padding-left: 1rem;
}

.article-item h4 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
  transition: color 0.2s;
}

.article-item:hover h4 {
  color: var(--primary-3);
}

.article-item .date {
  color: var(--text-secondary);
  font-size: 0.8rem;
  display: block;
  margin-bottom: 0.5rem;
}

.article-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.article-item a {
  font-weight: 500;
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
}

.article-item a:hover {
  border-bottom-color: currentColor;
}

/* ---------- FAQ 手风琴 ---------- */
.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(139, 92, 246, 0.3);
}

.faq-question {
  padding: 1.2rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-heading);
  background: rgba(139, 92, 246, 0.05);
  transition: background 0.2s ease;
  user-select: none;
}

.faq-question:hover {
  background: rgba(139, 92, 246, 0.1);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--primary-3);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  border-top: 1px solid transparent;
  color: var(--text-primary);
}

.faq-item.active .faq-answer {
  padding: 1.2rem 1.5rem;
  max-height: 300px;
  border-top-color: var(--border-light);
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 4rem 0 0;
  margin-top: 4rem;
  border-top: 1px solid var(--border-light);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(139, 92, 246, 0.5), transparent);
}

.footer h4 {
  color: var(--text-heading);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

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

.footer ul li {
  margin-bottom: 0.6rem;
}

.footer a {
  color: var(--text-footer);
  transition: color 0.2s ease;
  border-bottom: none;
}

.footer a:hover {
  color: var(--primary-3);
}

.footer .copyright {
  border-top: 1px solid var(--border-light);
  margin-top: 3rem;
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  background: var(--grad-btn);
  color: white;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 1.5rem;
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s ease;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.6);
}

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
}

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

th {
  background: rgba(139, 92, 246, 0.1);
  font-weight: 600;
  color: var(--text-heading);
  white-space: nowrap;
}

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

tr:hover td {
  background: rgba(139, 92, 246, 0.03);
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 延迟 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.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; }

/* 高亮关键词 */
.highlight {
  background: linear-gradient(120deg, rgba(139, 92, 246, 0.2) 0%, rgba(139, 92, 246, 0.1) 100%);
  padding: 0 0.3rem;
  border-radius: 4px;
  font-weight: 500;
}

/* 链接卡片 */
.link-card {
  display: block;
  padding: 1.2rem;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  margin-bottom: 0.8rem;
}

.link-card:hover {
  border-color: var(--primary-2);
  transform: translateX(4px);
  background: var(--bg-elevated);
}

/* ---------- 响应式细节 ---------- */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .hero {
    padding: 3rem 0 4rem;
    border-radius: 0 0 24px 24px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }

  .article-item:hover {
    padding-left: 0.5rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  .brand {
    font-size: 1.5rem;
  }

  .search-box input {
    width: 80px;
  }

  .search-box input:focus {
    width: 120px;
  }
}

/* ---------- 动画预设 ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

/* 加载动画 */
.loading {
  background: linear-gradient(90deg, var(--bg-card) 25%, rgba(139, 92, 246, 0.1) 50%, var(--bg-card) 75%);
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
  border-radius: 8px;
}

/* 打印优化 */
@media print {
  .header, .footer, .back-to-top, .btn, .menu-toggle {
    display: none !important;
  }
}

/* 无障碍：减少动画 */
@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;
  }
}
```