/* roulang page: index */
:root {
      --primary-deep-blue: #1B3A5C;
      --accent-warm-gold: #C49A2B;
      --bg-warm-white: #FAF8F5;
      --text-primary: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-muted: #8C8C8C;
      --cta-orange: #E06928;
      --cta-orange-hover: #C0551E;
      --card-bg: #FFFFFF;
      --border-light: #E8E5E0;
      --faq-bg: #F5F3F0;
      --footer-bg: #15293E;
      --shadow-sm: 0 4px 20px rgba(27, 58, 92, 0.08);
      --shadow-hover: 0 8px 32px rgba(27, 58, 92, 0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --max-width: 1280px;
      --section-gap: 100px;
    }

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

    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      font-size: 16px;
      line-height: 1.6;
      background-color: var(--bg-warm-white);
      color: var(--text-primary);
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3 {
      font-family: 'Noto Serif SC', 'Georgia', serif;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary-deep-blue);
    }

    h1 { font-size: 48px; letter-spacing: -0.5px; }
    h2 { font-size: 36px; margin-bottom: 24px; }
    h3 { font-size: 22px; font-weight: 600; }

    p, li { color: var(--text-secondary); }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 500;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      font-family: inherit;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--cta-orange);
      color: white;
      padding: 14px 32px;
      font-size: 16px;
      box-shadow: 0 4px 10px rgba(224, 105, 40, 0.25);
    }

    .btn-primary:hover {
      background: var(--cta-orange-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(224, 105, 40, 0.35);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep-blue);
      color: var(--primary-deep-blue);
      padding: 13px 31px;
    }

    .btn-outline:hover {
      background: rgba(27, 58, 92, 0.05);
      border-color: var(--primary-deep-blue);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.4s ease, box-shadow 0.4s ease;
      padding: 10px 0;
    }

    .header.scrolled {
      background: rgba(255, 255, 255, 0.97);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      backdrop-filter: blur(8px);
    }

    .nav-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 40px;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    .logo {
      font-family: 'Noto Serif SC', serif;
      font-size: 28px;
      font-weight: 700;
      color: var(--primary-deep-blue);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }

    .logo i {
      font-size: 26px;
      color: var(--accent-warm-gold);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .search-icon {
      font-size: 20px;
      color: var(--primary-deep-blue);
      cursor: pointer;
      transition: 0.3s;
    }

    .search-icon:hover { color: var(--accent-warm-gold); }

    .nav-channels {
      display: flex;
      justify-content: center;
      gap: 8px;
      padding: 8px 20px 12px;
      flex-wrap: nowrap;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    .channel-pill {
      background: transparent;
      border: none;
      padding: 8px 18px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: 40px;
      transition: all 0.3s;
      white-space: nowrap;
      cursor: pointer;
    }

    .channel-pill:hover {
      background: rgba(196, 154, 43, 0.1);
      color: var(--primary-deep-blue);
    }

    .channel-pill.active {
      background: rgba(196, 154, 43, 0.15);
      color: var(--primary-deep-blue);
      border-bottom: 2px solid var(--accent-warm-gold);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--primary-deep-blue);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 180px 0 120px;
      background: linear-gradient(180deg, #FAF8F5 0%, #F2EDE6 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.8;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-right {
      position: relative;
    }

    .hero-img {
      width: 100%;
      height: auto;
      border-radius: 28px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      object-fit: cover;
    }

    .data-cards {
      position: absolute;
      bottom: -25px;
      left: -25px;
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .data-card {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.8);
      border-radius: 18px;
      padding: 16px 20px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
      text-align: center;
    }

    .data-number {
      font-family: 'Inter', sans-serif;
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-deep-blue);
    }

    .data-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }

    /* 核心优势网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .advantage-card {
      background: var(--card-bg);
      padding: 40px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      text-align: left;
    }

    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .advantage-icon {
      font-size: 36px;
      color: var(--accent-warm-gold);
      margin-bottom: 24px;
      transition: transform 0.3s;
    }

    .advantage-card:hover .advantage-icon {
      transform: scale(1.1);
    }

    .advantage-card h3 {
      margin-bottom: 12px;
    }

    /* 案例瀑布流 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-tag {
      background: #E9F0F7;
      color: var(--primary-deep-blue);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 30px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 方案对比 */
    .compare-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: 0.3s;
    }

    .compare-col.featured {
      border: 2px solid var(--accent-warm-gold);
      background: #FFFDF7;
    }

    .compare-icon {
      font-size: 32px;
      color: var(--accent-warm-gold);
      margin-bottom: 20px;
    }

    .compare-list {
      list-style: none;
      margin: 20px 0;
    }

    .compare-list li {
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .compare-list i {
      color: var(--accent-warm-gold);
    }

    .text-link {
      color: var(--primary-deep-blue);
      font-weight: 600;
      border-bottom: 1px solid transparent;
    }

    .text-link:hover {
      border-bottom-color: var(--primary-deep-blue);
    }

    /* 数据背书 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      background: white;
      border-radius: 24px;
      padding: 50px 30px;
      box-shadow: var(--shadow-sm);
    }

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

    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 44px;
      font-weight: 700;
      color: var(--primary-deep-blue);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 12px;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-deep-blue);
    }

    .faq-icon {
      color: var(--accent-warm-gold);
      font-size: 20px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: var(--faq-bg);
      border-radius: 8px;
      padding: 0 16px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
      margin-bottom: 12px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-deep-blue);
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 0%, transparent 30%);
      text-align: center;
      padding: 80px 20px;
      border-radius: 32px;
      color: white;
    }

    .cta-banner h2 {
      color: white;
      margin-bottom: 24px;
    }

    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      color: #CCCFD4;
      padding: 70px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }

    .footer a {
      color: #CCCFD4;
    }

    .footer a:hover {
      color: var(--accent-warm-gold);
    }

    .copyright {
      text-align: center;
      margin-top: 50px;
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.1);
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .advantages-grid, .case-grid, .compare-row {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      .container { padding: 0 20px; }
      .nav-top { padding: 10px 20px; }
      .nav-channels { justify-content: flex-start; }
      .hamburger { display: block; }
      .nav-actions .btn { display: none; }
      .hero-grid, .advantages-grid, .case-grid, .compare-row {
        grid-template-columns: 1fr;
      }
      .hero { padding: 140px 0 80px; }
      .data-cards { position: static; margin-top: 20px; }
      .stats-bar { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }