```css
/* ===== 全站样式 ===== */
:root {
  --bg-light: #f8fafc;
  --bg-dark: #0f172a;
  --text-primary-light: #1f2937;
  --text-secondary-light: #2d3a4f;
  --text-muted-light: #475569;
  --text-heading-light: #111827;
  --bg-card-light: #ffffff;
  --border-light: #e2e8f0;
  --brand-color: #f97316;
  --brand-dark: #c2620f;
  --text-on-brand: #ffffff;
  --footer-bg: #1e293b;
  --footer-text: #e2e8f0;
  --footer-heading: #ffffff;
  --nav-bg-light: rgba(255, 255, 255, 0.85);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 16px;
  --radius-sm: 12px;
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --gradient-brand: linear-gradient(135deg, #f97316, #ef4444);
  --gradient-banner: linear-gradient(145deg, #0f172a 0%, #1e293b 50%, #f97316 100%);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --backdrop-blur: blur(12px);
}

[data-theme="dark"] {
  --bg-light: #0f172a;
  --bg-dark: #020617;
  --text-primary-light: #e2e8f0;
  --text-secondary-light: #cbd5e1;
  --text-muted-light: #94a3b8;
  --text-heading-light: #f8fafc;
  --bg-card-light: #1e293b;
  --border-light: #334155;
  --nav-bg-light: rgba(15, 23, 42, 0.85);
  --footer-bg: #020617;
  --footer-text: #cbd5e1;
  --footer-heading: #f1f5f9;
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(148, 163, 184, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.4);
}

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

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

body {
  background: var(--bg-light);
  color: var(--text-primary-light);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading-light);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-top: 2.5rem;
  position: relative;
  padding-bottom: 0.75rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--gradient-brand);
  border-radius: 2px;
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
}

h4 {
  font-size: 1.1rem;
}

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

a {
  color: var(--brand-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

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

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

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: 1rem;
}

.mt-2 {
  margin-top: 2rem;
}

.hidden {
  display: none;
}

/* ===== 导航栏 ===== */
.site-header {
  background: var(--nav-bg-light);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-light);
  transition: background 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 1rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-heading-light);
  letter-spacing: -0.5px;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.logo span {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-primary-light);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-links a:hover {
  color: var(--brand-color);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card-light);
  border-radius: 50px;
  padding: 0.4rem 0.4rem 0.4rem 1.2rem;
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.search-box:focus-within {
  border-color: var(--brand-color);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.15);
}

.search-box input {
  border: none;
  background: transparent;
  color: var(--text-primary-light);
  outline: none;
  padding: 0.35rem;
  width: 130px;
  font-size: 0.9rem;
  transition: width 0.3s ease;
}

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

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

.search-box button {
  background: var(--gradient-brand);
  border: none;
  cursor: pointer;
  color: white;
  font-size: 1rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

.search-box button:hover {
  transform: scale(1.1);
}

.theme-toggle,
.menu-toggle {
  background: var(--bg-card-light);
  border: 1px solid var(--border-light);
  border-radius: 50px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  color: var(--text-primary-light);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.theme-toggle:hover,
.menu-toggle:hover {
  border-color: var(--brand-color);
  color: var(--brand-color);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  font-size: 1.2rem;
  padding: 0.4rem 0.8rem;
}

/* ===== 移动端导航 ===== */
@media (max-width: 900px) {
  .nav-wrap {
    height: 60px;
    flex-wrap: wrap;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    background: var(--nav-bg-light);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    z-index: 999;
  }

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

  .nav-links a {
    font-size: 1.1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .menu-toggle {
    display: flex;
  }

  .search-box {
    order: -1;
    flex: 1;
    max-width: 200px;
  }

  .search-box input {
    width: 100%;
  }

  .search-box input:focus {
    width: 100%;
  }

  .nav-actions {
    gap: 0.5rem;
  }

  .theme-toggle {
    padding: 0.4rem 0.7rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .logo {
    font-size: 1.5rem;
  }

  .search-box {
    display: none;
  }

  .nav-actions {
    gap: 0.3rem;
  }

  .theme-toggle {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
  }
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  background: var(--gradient-brand);
  color: var(--text-on-brand);
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  box-shadow: 0 4px 15px rgba(249, 115, 22, 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 6px 20px rgba(249, 115, 22, 0.4);
  color: white;
}

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

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

/* ===== 卡片 ===== */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(249, 115, 22, 0.3);
}

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

.card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.2rem;
}

.card p {
  margin-bottom: 0.75rem;
}

/* 网格布局 */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* ===== Banner区域 ===== */
.banner {
  background: var(--gradient-banner);
  color: white;
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
  animation: pulse 6s ease-in-out infinite;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 40%;
  height: 150%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
}

.banner h1 {
  color: white;
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.banner p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.1rem;
}

.banner-content {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.banner-text {
  flex: 1 1 300px;
}

.banner-text .btn {
  margin-top: 1.5rem;
  background: white;
  color: var(--brand-dark);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.banner-text .btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.banner-text .btn::before {
  background: linear-gradient(90deg, transparent, rgba(249, 115, 22, 0.1), transparent);
}

.banner svg {
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  transition: transform 0.5s ease;
}

.banner svg:hover {
  transform: scale(1.02) rotate(1deg);
}

/* ===== 文章卡片 ===== */
.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-card h3 {
  font-size: 1.15rem;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  flex-grow: 1;
}

.article-card .text-muted {
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
}

.article-card p {
  font-size: 0.95rem;
  flex-grow: 1;
}

.article-card a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--brand-dark);
  font-weight: 600;
  margin-top: 0.75rem;
  transition: gap 0.2s ease;
}

.article-card a:hover {
  gap: 0.6rem;
  color: var(--brand-color);
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 1.25rem 0;
  transition: background 0.2s ease;
}

.faq-question {
  font-weight: 600;
  color: var(--text-heading-light);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 1.05rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  transition: all 0.2s ease;
  background: var(--bg-card-light);
}

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

.faq-question:hover {
  background: rgba(249, 115, 22, 0.05);
  color: var(--brand-dark);
}

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

.faq-answer {
  margin-top: 0.5rem;
  color: var(--text-primary-light);
  padding: 0 1rem 0.5rem;
  line-height: 1.8;
  animation: fadeInUp 0.3s ease;
}

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

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

th {
  background: var(--bg-card-light);
  color: var(--text-heading-light);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

td {
  color: var(--text-primary-light);
  font-size: 0.95rem;
}

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

tr:hover td {
  background: rgba(249, 115, 22, 0.03);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 4rem 0 1.5rem;
  margin-top: 5rem;
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
}

.site-footer a {
  color: var(--footer-text);
  transition: color 0.2s ease;
}

.site-footer a:hover {
  color: var(--brand-color);
}

.site-footer h4 {
  color: var(--footer-heading);
  margin-bottom: 1.25rem;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.footer-links a {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.copyright {
  text-align: center;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  color: var(--footer-text);
  font-size: 0.9rem;
}

.copyright p {
  color: var(--footer-text);
  margin-bottom: 0.25rem;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-size: 0.9rem;
  margin: 1.5rem 0;
  color: var(--text-muted-light);
  padding: 0.5rem 0;
}

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

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

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--gradient-brand);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 8px 25px rgba(249, 115, 22, 0.4);
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
}

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

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(249, 115, 22, 0.5);
}

/* ===== 标签 ===== */
.tag {
  background: var(--bg-card-light);
  color: var(--brand-dark);
  border: 1px solid var(--border-light);
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  display: inline-block;
  margin: 0.25rem;
  transition: all 0.2s ease;
}

.tag:hover {
  background: var(--brand-color);
  color: white;
  border-color: var(--brand-color);
}

/* ===== 区块标题 ===== */
.section-title {
  margin-top: 3rem;
  margin-bottom: 1.5rem;
}

/* ===== 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);
}

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

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

@keyframes pulse {
  0%, 100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

/* ===== 响应式调整 ===== */
@media (max-width: 768px) {
  .banner {
    padding: 3rem 0;
  }

  .banner-content {
    gap: 1.5rem;
    text-align: center;
  }

  .banner-text {
    flex: 1 1 100%;
  }

  .banner-text .btn {
    margin-top: 1rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

  .footer-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  .card {
    padding: 1.25rem;
    border-radius: 12px;
  }

  .breadcrumb {
    font-size: 0.8rem;
  }

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

  .copyright {
    font-size: 0.8rem;
  }
}

/* 暗色模式适配 */
[data-theme="dark"] .banner {
  background: linear-gradient(145deg, #020617 0%, #0f172a 50%, #1e293b 100%);
}

[data-theme="dark"] .btn {
  color: white;
}

[data-theme="dark"] .card {
  background: rgba(30, 41, 59, 0.6);
}

[data-theme="dark"] .faq-question {
  background: var(--bg-card-light);
}

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

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

[data-theme="dark"] .banner-text .btn {
  color: var(--brand-dark);
}

/* 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-color), var(--brand-dark));
  border-radius: 5px;
}

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

/* 选中文本样式 */
::selection {
  background: var(--brand-color);
  color: white;
}

/* 焦点可见性 */
:focus {
  outline: 3px solid rgba(249, 115, 22, 0.4);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* 打印样式 */
@media print {
  .site-header,
  .site-footer,
  .back-to-top,
  .banner,
  .breadcrumb,
  .nav-actions {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}
```