/* roulang page: index */
:root {
      --primary: #C8A96E;
      --primary-dark: #A68A4C;
      --secondary: #1A1F2E;
      --accent: #4DA8DA;
      --bg-deep: #0D1117;
      --card-bg: rgba(26, 31, 46, 0.6);
      --card-highlight: rgba(200, 169, 110, 0.08);
      --text-primary: #FFFFFF;
      --text-body: #B0B8C8;
      --text-muted: #6B7280;
      --gold-emphasis: #C8A96E;
      --border-light: rgba(255, 255, 255, 0.06);
      --border-gold: rgba(200, 169, 110, 0.15);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(200, 169, 110, 0.08);
      --shadow-glow: 0 0 24px rgba(200, 169, 110, 0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-container: 24px;
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(13, 17, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(13,17,23,0.85), rgba(13,17,23,0.85)), 
                        linear-gradient(90deg, transparent, var(--primary), transparent);
      background-origin: border-box;
      background-clip: padding-box, border-box;
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      color: #0D1117;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: "";
      position: absolute;
      bottom: -8px;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--primary);
      border-radius: 1px;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-btn {
      background: none;
      border: none;
      color: var(--text-body);
      font-size: 1.2rem;
      cursor: pointer;
      transition: color 0.2s;
    }
    .search-btn:hover { color: var(--primary); }
    .login-link {
      color: var(--primary);
      text-decoration: none;
      border: 1px solid var(--primary);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.9rem;
      transition: all 0.2s;
    }
    .login-link:hover {
      background: rgba(200,169,110,0.1);
    }
    .cta-btn-sm {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff;
      border: none;
      padding: 10px 20px;
      border-radius: 20px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 0 12px rgba(200,169,110,0.3);
      transition: 0.3s;
      font-size: 0.9rem;
    }
    .cta-btn-sm:hover {
      box-shadow: 0 0 20px rgba(200,169,110,0.5);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 1.6rem;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links, .header-actions .search-btn, .header-actions .login-link {
        display: none;
      }
      .hamburger { display: block; }
    }
    /* 移动菜单抽屉 */
    .mobile-menu {
      position: fixed; top: 64px; left: 0; width: 100%; height: calc(100vh - 64px);
      background: rgba(13,17,23,0.95); backdrop-filter: blur(24px);
      display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 32px;
      transform: translateY(-100%); transition: 0.3s; z-index: 99;
    }
    .mobile-menu.open { transform: translateY(0); }
    .mobile-menu a { color: var(--text-body); font-size: 1.4rem; text-decoration: none; }
    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff; border: none; padding: 14px 32px; border-radius: var(--radius-btn);
      font-weight: 600; font-size: 1rem; cursor: pointer;
      box-shadow: 0 0 20px rgba(200,169,110,0.4), 0 4px 12px rgba(0,0,0,0.3);
      transition: 0.3s ease; display: inline-block; text-decoration: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(200,169,110,0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent; border: 1px solid var(--primary); color: var(--primary);
      padding: 14px 32px; border-radius: var(--radius-btn); font-weight: 600;
      transition: 0.3s; display: inline-block; text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(200,169,110,0.1);
    }
    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 640px) {
      section { padding: 60px 0; }
    }
    .section-title {
      font-size: 2.25rem; font-weight: 700; color: var(--text-primary);
      letter-spacing: -0.02em; margin-bottom: 16px;
    }
    /* Hero */
    .hero {
      padding-top: 120px;
      background-image: radial-gradient(circle at 20% 30%, rgba(200,169,110,0.08) 0%, transparent 40%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex; align-items: center; gap: 48px;
    }
    .hero-left { flex: 1; }
    .hero-right { flex: 1; position: relative; }
    .hero h1 {
      font-size: 3rem; font-weight: 700; color: var(--text-primary);
      line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 20px;
    }
    .hero .subtitle { font-size: 1.2rem; color: var(--text-body); margin-bottom: 32px; max-width: 540px; }
    .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
    .data-card {
      background: var(--card-bg); backdrop-filter: blur(16px); border-radius: var(--radius-card);
      padding: 24px; border: 1px solid var(--border-light); box-shadow: var(--shadow-card);
    }
    .hero-right img { width: 100%; border-radius: 16px; opacity: 0.9; }
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .hero h1 { font-size: 2.2rem; }
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .highlight-card {
      background: var(--card-bg); backdrop-filter: blur(16px);
      border-radius: var(--radius-card); padding: 28px;
      border: 1px solid var(--border-light); box-shadow: var(--shadow-card);
      transition: 0.25s; min-height: 220px;
    }
    .highlight-card:hover {
      transform: translateY(-4px); box-shadow: var(--shadow-glow);
      background: rgba(26,31,46,0.8);
    }
    .highlight-icon { font-size: 2.5rem; color: var(--primary); margin-bottom: 16px; }
    .highlight-card h3 { font-size: 1.25rem; color: var(--text-primary); margin-bottom: 8px; }
    .highlight-card p { color: var(--text-body); font-size: 0.9rem; }
    @media (max-width: 768px) {
      .highlights-grid { grid-template-columns: 1fr; }
    }
    /* 案例瀑布流 */
    .cases-masonry {
      columns: 2; column-gap: 24px;
    }
    .case-card {
      break-inside: avoid; margin-bottom: 24px;
      background: var(--card-bg); backdrop-filter: blur(16px);
      border-radius: var(--radius-card); overflow: hidden;
      border: 1px solid var(--border-light); transition: 0.3s;
    }
    .case-card:hover { border-color: var(--primary); box-shadow: var(--shadow-glow); }
    .case-img { width: 100%; display: block; height: auto; }
    .case-content { padding: 20px; }
    .tag { background: rgba(200,169,110,0.15); color: var(--primary); padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; }
    .case-title { color: var(--text-primary); font-weight: 600; margin: 12px 0 8px; }
    .case-desc { color: var(--text-body); font-size: 0.9rem; }
    .metric { color: var(--primary); font-weight: 700; font-size: 1.4rem; margin-top: 12px; }
    @media (max-width: 640px) {
      .cases-masonry { columns: 1; }
    }
    /* 对比表 */
    .compare-table {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
    }
    .compare-col {
      background: var(--card-bg); backdrop-filter: blur(16px);
      border-radius: var(--radius-card); padding: 32px 24px;
      border: 1px solid var(--border-light); text-align: center;
    }
    .compare-col.recommend {
      border: 1px solid var(--primary); box-shadow: 0 0 28px rgba(200,169,110,0.25);
    }
    .badge {
      background: var(--primary); color: #0D1117; padding: 4px 16px;
      border-radius: 20px; font-weight: 700; display: inline-block; margin-bottom: 12px;
    }
    .compare-col h3 { color: #fff; margin: 12px 0; }
    .feature-list { list-style: none; text-align: left; margin: 20px 0; }
    .feature-list li { margin: 10px 0; color: var(--text-body); }
    @media (max-width: 768px) {
      .compare-table { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .faq-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.04); padding: 16px 0;
    }
    .faq-question {
      display: flex; justify-content: space-between; align-items: center;
      cursor: pointer; font-weight: 600; color: var(--text-primary);
      padding: 8px 0; transition: 0.2s;
    }
    .faq-answer {
      max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
      color: var(--text-body); padding-left: 12px; border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px; border-left-color: var(--primary); margin-top: 8px;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }
    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at 30% 50%, rgba(200,169,110,0.15) 0%, transparent 60%);
      text-align: center; padding: 80px 0;
    }
    /* 页脚 */
    .footer-grid {
      display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
    }
    .footer-col h4 { color: var(--primary); margin-bottom: 20px; font-size: 0.9rem; text-transform: uppercase; }
    .footer-col a, .footer-col p { color: var(--text-muted); font-size: 0.9rem; display: block; margin: 8px 0; text-decoration: none; }
    .footer-col a:hover { color: var(--primary); }
    .copyright { border-top: 1px solid rgba(255,255,255,0.05); margin-top: 40px; padding-top: 20px; display: flex; justify-content: space-between; color: var(--text-muted); font-size: 0.8rem; }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }