```css
/* ===== 重置与基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  background: #fdf8f2;
  color: #333;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}
img, svg { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: rgba(0,0,0,0.04); }
::-webkit-scrollbar-thumb { background: linear-gradient(135deg, #f6ad55, #ed8936); border-radius: 8px; }

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

/* ===== 导航栏 ===== */
.nav-bar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  transition: background 0.3s ease;
}
.nav-bar .container { display: flex; align-items: center; justify-content: space-between; padding-top: 0.6rem; padding-bottom: 0.6rem; }
.nav-logo { font-weight: 800; font-size: 1.6rem; background: linear-gradient(135deg, #f6ad55, #ed8936); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: 0.5px; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-link { position: relative; font-weight: 500; color: #4a5568; padding: 0.25rem 0; transition: color 0.3s ease; }
.nav-link::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: linear-gradient(90deg, #f6ad55, #ed8936); border-radius: 2px; transition: width 0.3s ease; }
.nav-link:hover { color: #ed8936; }
.nav-link:hover::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.04); border: 1px solid rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease; font-size: 1.1rem;
}
.icon-btn:hover { background: rgba(237, 137, 54, 0.12); border-color: rgba(237, 137, 54, 0.3); transform: scale(1.06); }

/* ===== Banner 区域 ===== */
.hero-section {
  position: relative;
  padding: 4.5rem 0;
  background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
  overflow: hidden;
}
.hero-section::before {
  content: ''; position: absolute; top: -60%; right: -20%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.25) 0%, transparent 65%);
  border-radius: 50%; pointer-events: none;
}
.hero-section::after {
  content: ''; position: absolute; bottom: -40%; left: -15%; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 60%);
  border-radius: 50%; pointer-events: none;
}
.hero-content { display: flex; align-items: center; gap: 3.5rem; position: relative; z-index: 2; }
.hero-text { flex: 1.2; }
.hero-text h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  background: linear-gradient(135deg, #2d3748, #4a5568);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 0.75rem; line-height: 1.2;
}
.hero-text .subtitle { font-size: 1.2rem; color: #4a5568; max-width: 540px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 1rem; margin-top: 1.8rem; flex-wrap: wrap; }
.btn-primary {
  padding: 0.8rem 2.2rem; border-radius: 50px;
  background: linear-gradient(135deg, #ed8936, #dd6b20);
  color: #fff; font-weight: 600; font-size: 1rem;
  box-shadow: 0 8px 24px rgba(237, 137, 54, 0.35);
  transition: all 0.35s ease; border: none;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(237, 137, 54, 0.45); }
.btn-ghost {
  padding: 0.8rem 2rem; border-radius: 50px;
  background: rgba(255, 255, 255, 0.5);
  border: 1.5px solid rgba(255, 255, 255, 0.8);
  color: #4a5568; font-weight: 500; backdrop-filter: blur(4px);
  transition: all 0.3s ease;
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.75); transform: translateY(-3px); }
.hero-visual { flex: 1; display: flex; justify-content: center; }
.hero-svg-wrap {
  background: rgba(255,255,255,0.3); backdrop-filter: blur(8px);
  border-radius: 24px; padding: 1.5rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.08);
  border: 1px solid rgba(255,255,255,0.4);
  transition: transform 0.4s ease;
}
.hero-svg-wrap:hover { transform: scale(1.03) rotate(1deg); }

/* ===== 通用卡片 ===== */
.card {
  background: #fff;
  border-radius: 20px;
  padding: 1.8rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, #f6ad55, #ed8936, #dd6b20);
  opacity: 0; transition: opacity 0.3s ease;
}
.card:hover { transform: translateY(-8px); box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08); }
.card:hover::before { opacity: 1; }
.card h3 { font-size: 1.25rem; margin-bottom: 0.5rem; color: #2d3748; }
.card h4 { font-size: 1.1rem; margin-bottom: 0.3rem; color: #2d3748; }
.card p { color: #718096; font-size: 0.95rem; line-height: 1.6; }
.card time { font-size: 0.8rem; color: #a0aec0; display: block; margin-bottom: 0.5rem; }
.card .btn-link { display: inline-block; margin-top: 0.5rem; color: #ed8936; font-weight: 600; font-size: 0.9rem; border-bottom: 1px solid transparent; transition: all 0.3s ease; }
.card .btn-link:hover { border-bottom-color: #ed8936; }

/* ===== 网格布局 ===== */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.8rem; margin-top: 2rem; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.8rem; margin-top: 2rem; }
.grid-articles { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.8rem; margin-top: 2rem; }

/* ===== 章节标题 ===== */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 1.2rem;
  display: flex; align-items: center; gap: 0.75rem;
  color: #2d3748;
}
.section-title::after { content: ''; flex: 1; height: 2px; background: linear-gradient(90deg, #ed8936, transparent); border-radius: 2px; margin-left: 1rem; }
.section-lead { color: #718096; margin-bottom: 2rem; max-width: 720px; line-height: 1.8; }

/* ===== 品牌区 ===== */
.brand-section { padding: 2rem 0 3rem; }
.brand-cards .card { text-align: center; padding: 2rem 1.5rem; }
.brand-cards .card h3 { font-size: 1.3rem; position: relative; display: inline-block; }
.brand-cards .card h3::after { content: ''; display: block; width: 40px; height: 3px; background: linear-gradient(90deg, #f6ad55, #ed8936); margin: 0.5rem auto 0; border-radius: 4px; }
.brand-cards .card p { margin-top: 0.75rem; }

/* ===== 特点区 ===== */
.feature-section { padding: 3rem 0; }
.feature-wrap { display: flex; flex-wrap: wrap; gap: 2.5rem; margin-top: 2rem; }
.feature-item { flex: 1; min-width: 280px; padding: 1.5rem; background: rgba(255,255,255,0.7); border-radius: 16px; border-left: 4px solid #ed8936; transition: all 0.3s ease; }
.feature-item:hover { background: #fff; box-shadow: 0 8px 30px rgba(0,0,0,0.05); transform: translateX(6px); }
.feature-item h3 { font-size: 1.2rem; margin-bottom: 0.6rem; color: #2d3748; }
.feature-item p { color: #718096; font-size: 0.95rem; }

/* ===== 用户故事 ===== */
.stories-section { padding: 3rem 0; }
.story-card { background: #fff; border-radius: 20px; padding: 2rem; position: relative; box-shadow: 0 4px 20px rgba(0,0,0,0.04); transition: all 0.3s ease; }
.story-card::before { content: '“'; font-size: 4rem; color: #ed8936; opacity: 0.2; position: absolute; top: 0.5rem; left: 1.2rem; font-family: Georgia, serif; }
.story-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); }
.story-card h4 { font-size: 1.1rem; color: #2d3748; margin-bottom: 0.5rem; }
.story-card p { color: #718096; font-size: 0.95rem; line-height: 1.7; }

/* ===== FAQ ===== */
.faq-section { padding: 3rem 0; }
.faq-item {
  background: #fff; border-radius: 16px; margin-bottom: 1rem;
  border: 1px solid rgba(0,0,0,0.05); overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item:hover { border-color: rgba(237, 137, 54, 0.3); box-shadow: 0 4px 16px rgba(0,0,0,0.04); }
.faq-item summary {
  padding: 1.1rem 1.5rem; font-weight: 600; color: #2d3748;
  cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center;
  transition: background 0.3s ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '＋'; font-size: 1.2rem; color: #ed8936; transition: transform 0.3s ease; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { background: rgba(237, 137, 54, 0.04); }
.faq-answer { padding: 0 1.5rem 1.2rem; color: #718096; font-size: 0.95rem; line-height: 1.7; }

/* ===== 教程区 ===== */
.guide-section { padding: 3rem 0; }
.guide-card { background: #fff; border-radius: 24px; padding: 2.5rem; box-shadow: 0 8px 30px rgba(0,0,0,0.04); }
.guide-card h3 { margin-top: 1.5rem; margin-bottom: 0.5rem; color: #2d3748; font-size: 1.2rem; }
.guide-card h3:first-child { margin-top: 0; }
.guide-card p { color: #718096; margin-bottom: 0.5rem; }
.guide-card ol { padding-left: 1.5rem; margin-bottom: 1rem; color: #718096; }
.guide-card ol li { padding: 0.3rem 0; position: relative; }
.guide-card ol li::marker { color: #ed8936; font-weight: 700; }

/* ===== 页脚 ===== */
.footer {
  background: linear-gradient(135deg, #1a202c, #2d3748);
  color: #cbd5e0;
  padding: 3.5rem 0 0;
  margin-top: 4rem;
  position: relative;
}
.footer::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, #f6ad55, #ed8936, #dd6b20); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2.5rem; }
.footer h4 { color: #fff; font-size: 1.05rem; margin-bottom: 1rem; position: relative; padding-bottom: 0.5rem; }
.footer h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 30px; height: 2px; background: #ed8936; border-radius: 2px; }
.footer p { font-size: 0.9rem; line-height: 1.8; color: #a0aec0; }
.footer a { color: #a0aec0; transition: color 0.3s ease; font-size: 0.9rem; line-height: 2; }
.footer a:hover { color: #f6ad55; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 2.5rem; padding: 1.2rem 0;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem;
}
.footer-bottom p { color: #718096; font-size: 0.85rem; }

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, #ed8936, #dd6b20);
  color: #fff; font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(237, 137, 54, 0.4);
  transition: all 0.3s ease; z-index: 99;
}
.back-to-top:hover { transform: translateY(-4px) scale(1.05); box-shadow: 0 12px 32px rgba(237, 137, 54, 0.5); }

/* ===== 滚动动画 ===== */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.8s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== 暗色模式 ===== */
body.dark-mode {
  background: #1a202c;
  color: #e2e8f0;
}
body.dark-mode .nav-bar {
  background: rgba(26, 32, 44, 0.85);
  border-bottom-color: rgba(255,255,255,0.06);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}
body.dark-mode .nav-logo { background: linear-gradient(135deg, #f6ad55, #fbbf24); -webkit-background-clip: text; background-clip: text; }
body.dark-mode .nav-link { color: #cbd5e0; }
body.dark-mode .nav-link:hover { color: #f6ad55; }
body.dark-mode .icon-btn { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); color: #e2e8f0; }
body.dark-mode .hero-section { background: linear-gradient(135deg, #2d3748, #1a202c); }
body.dark-mode .hero-text h1 { background: linear-gradient(135deg, #f6ad55, #fbbf24); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
body.dark-mode .hero-text .subtitle { color: #a0aec0; }
body.dark-mode .btn-ghost { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.15); color: #e2e8f0; }
body.dark-mode .card,
body.dark-mode .story-card,
body.dark-mode .faq-item,
body.dark-mode .guide-card {
  background: #2d3748;
  border-color: rgba(255,255,255,0.06);
}
body.dark-mode .card h3,
body.dark-mode .card h4,
body.dark-mode .story-card h4,
body.dark-mode .faq-item summary,
body.dark-mode .guide-card h3 {
  color: #f7fafc;
}
body.dark-mode .card p,
body.dark-mode .story-card p,
body.dark-mode .faq-answer,
body.dark-mode .guide-card p,
body.dark-mode .guide-card ol {
  color: #a0aec0;
}
body.dark-mode .feature-item { background: rgba(45, 55, 72, 0.6); }
body.dark-mode .feature-item h3 { color: #f7fafc; }
body.dark-mode .feature-item p { color: #a0aec0; }
body.dark-mode .section-title { color: #f7fafc; }
body.dark-mode .section-title::after { background: linear-gradient(90deg, #f6ad55, transparent); }
body.dark-mode .section-lead { color: #a0aec0; }
body.dark-mode .footer { background: linear-gradient(135deg, #111827, #1a202c); }
body.dark-mode .footer h4 { color: #f7fafc; }
body.dark-mode .footer p, body.dark-mode .footer a { color: #a0aec0; }
body.dark-mode .footer a:hover { color: #f6ad55; }
body.dark-mode .footer-bottom { border-color: rgba(255,255,255,0.06); }
body.dark-mode .hero-svg-wrap { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-content { flex-direction: column; text-align: center; gap: 2rem; }
  .hero-text .subtitle { margin: 0 auto; }
  .hero-buttons { justify-content: center; }
  .nav-links { gap: 1.2rem; }
}

@media (max-width: 768px) {
  .container { padding: 0 1rem; }
  .nav-links { gap: 0.8rem; }
  .nav-link { font-size: 0.9rem; }
  .nav-actions .icon-btn:last-child { display: none; } /* 隐藏菜单按钮简化 */
  .hero-section { padding: 3rem 0; }
  .hero-text h1 { font-size: 1.9rem; }
  .hero-text .subtitle { font-size: 1rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-articles { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .back-to-top { bottom: 1.2rem; right: 1.2rem; width: 42px; height: 42px; }
  .faq-item summary { padding: 1rem 1.2rem; }
  .faq-answer { padding: 0 1.2rem 1rem; }
  .guide-card { padding: 1.8rem; }
}

@media (max-width: 480px) {
  .nav-links { gap: 0.5rem; }
  .nav-link { font-size: 0.82rem; }
  .nav-logo { font-size: 1.3rem; }
  .card { padding: 1.4rem; }
  .story-card { padding: 1.5rem; }
  .feature-item { min-width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
}
```