/* roulang page: index */
:root {
      --primary: #0F172A;
      --primary-soft: #1E293B;
      --accent-gold: #F59E0B;
      --accent-gold-deep: #D97706;
      --accent-green: #10B981;
      --bg: #F8FAFC;
      --card: #FFFFFF;
      --text: #1E293B;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --transition: 0.3s ease;
      --max-width: 1280px;
    }

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
    }

    .logo span {
      color: var(--accent-gold);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-muted);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent-gold);
      border-radius: 40px;
      transition: width var(--transition);
    }

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

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
    }

    .menu-toggle span {
      width: 26px;
      height: 3px;
      background: var(--primary);
      border-radius: 10px;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: white;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
      color: white;
    }

    .hero-title span {
      background: linear-gradient(to right, #F59E0B, #FBBF24);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: #CBD5E1;
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(145deg, #F59E0B, #D97706);
      color: #0F172A;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 50px;
      box-shadow: 0 8px 18px rgba(245,158,11,0.3);
      transition: all var(--transition);
      font-size: 1rem;
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 500;
      transition: all var(--transition);
    }

    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }

    .hero-badges {
      display: flex;
      flex-direction: column;
      gap: 20px;
      flex: 0 0 auto;
    }

    .badge-item {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(4px);
      border-radius: 100px;
      padding: 16px 28px;
      display: flex;
      align-items: center;
      gap: 12px;
      color: white;
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.15);
    }

    .badge-icon {
      font-size: 1.5rem;
    }

    .green-badge {
      display: inline-block;
      background: var(--accent-green);
      color: white;
      padding: 6px 18px;
      border-radius: 40px;
      font-size: 0.9rem;
      font-weight: 600;
    }

    /* 通用板块 */
    .section {
      padding: 80px 0;
    }

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

    .section-header h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary);
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-top: 10px;
    }

    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }

    .advantage-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 36px 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 4px solid transparent;
      text-align: center;
    }

    .advantage-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
      border-top: 4px solid var(--accent-gold);
    }

    .advantage-icon {
      font-size: 2.8rem;
      margin-bottom: 20px;
    }

    .advantage-title {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* 功能分组 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-text {
      flex: 1;
    }

    .feature-img {
      flex: 1;
      background: #E2E8F0;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .feature-img img {
      width: 100%;
      height: 320px;
      object-fit: cover;
    }

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

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
      font-weight: 500;
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scenario-card {
      background: var(--card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .scenario-img {
      height: 200px;
      background: #CBD5E1;
    }

    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .scenario-content {
      padding: 24px;
    }

    /* 案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
    }

    .case-card {
      background: var(--primary);
      color: white;
      min-width: 280px;
      border-radius: 20px;
      padding: 28px;
      flex-shrink: 0;
    }

    .case-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--accent-gold);
    }

    /* 价格 */
    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .price-card {
      background: var(--card);
      border-radius: 24px;
      padding: 38px 24px;
      text-align: center;
      border: 2px solid transparent;
    }

    .price-card.highlight {
      border: 2px solid var(--accent-gold);
      background: white;
      position: relative;
      transform: scale(1.02);
    }

    .popular-badge {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--accent-gold);
      color: black;
      font-weight: 700;
      padding: 5px 18px;
      border-radius: 40px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
    }

    .faq-question {
      width: 100%;
      background: transparent;
      padding: 24px;
      font-weight: 700;
      font-size: 1.1rem;
      text-align: left;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      background: #F8FAFC;
      padding: 0 24px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }

    .faq-item.open .faq-question {
      color: var(--accent-gold-deep);
    }

    /* 最终CTA */
    .cta-banner {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 70px 20px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #CBD5E1;
      padding: 50px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .hero-grid { flex-direction: column; }
      .advantages-grid { grid-template-columns: 1fr; }
      .feature-row, .feature-row.reverse { flex-direction: column; }
      .scenarios-grid, .price-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }