/* roulang page: index */
:root {
      --primary-deep-purple: #3A2C3F;
      --accent-champagne: #D4AF37;
      --bg-warm-white: #FAF7F2;
      --card-white: #FFFFFF;
      --border-light: #E8E4DD;
      --text-charcoal: #2C2C2C;
      --text-secondary: #6B6B6B;
      --success-emerald: #2E7D5C;
      --bg-soft-milk: #F5F1EB;
      --faq-bg: #F9F7F4;
      --footer-text: #CBC5D0;
      --font-serif: "Noto Serif SC", "STSong", "Songti SC", Georgia, serif;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --shadow-card: 0 2px 12px rgba(58, 44, 63, 0.06);
      --shadow-card-hover: 0 6px 20px rgba(58, 44, 63, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-faq: 8px;
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-white);
      color: var(--text-charcoal);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
    }

    h1 {
      font-size: 42px;
      line-height: 1.3;
      font-weight: 700;
      color: var(--primary-deep-purple);
    }

    h2 {
      font-size: 32px;
      line-height: 1.35;
      color: var(--primary-deep-purple);
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
      color: var(--text-charcoal);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--bg-warm-white);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: box-shadow 0.3s;
    }

    .site-header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .nav-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-deep-purple);
      letter-spacing: 1px;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      font-size: 18px;
      color: var(--text-secondary);
      opacity: 0.7;
    }

    .btn-primary-small {
      background: linear-gradient(135deg, #D4AF37, #C09B2E);
      color: white;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.5px;
    }

    .btn-primary-small:hover {
      background: #B8922A;
      transform: translateY(-1px);
      box-shadow: 0 4px 10px rgba(212, 175, 55, 0.3);
    }

    .nav-tabs {
      display: flex;
      gap: 8px;
      padding: 8px 0 12px;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
      border-top: 1px solid var(--border-light);
    }

    .nav-tabs::-webkit-scrollbar {
      display: none;
    }

    .tab-link {
      padding: 8px 20px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      background: transparent;
      transition: var(--transition);
      flex-shrink: 0;
    }

    .tab-link:hover {
      background: rgba(58,44,63,0.05);
      color: var(--primary-deep-purple);
    }

    .tab-link.active {
      color: var(--accent-champagne);
      font-weight: 600;
      border-bottom: 2px solid var(--accent-champagne);
      background: transparent;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(90deg, rgba(58,44,63,0.85) 0%, rgba(58,44,63,0.2) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }

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

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

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      line-height: 1.6;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #D4AF37, #C09B2E);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(212,175,55,0.4);
    }

    .btn-primary:hover {
      background: #B8922A;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }

    .hero-right {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 32px;
    }

    .metric-row {
      display: flex;
      gap: 24px;
      justify-content: center;
    }

    .metric {
      text-align: center;
    }

    .metric-number {
      font-size: 38px;
      font-weight: 700;
      color: var(--accent-champagne);
      line-height: 1.2;
    }

    .metric-label {
      color: rgba(255,255,255,0.8);
      font-size: 14px;
    }

    /* 通用区块 */
    .section {
      padding: 100px 0;
    }

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

    .section-header h2 {
      margin-bottom: 12px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 17px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }

    .pain-card:hover {
      border-bottom: 3px solid var(--accent-champagne);
      box-shadow: var(--shadow-card-hover);
    }

    .pain-icon {
      font-size: 28px;
      color: var(--accent-champagne);
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
      background: var(--bg-soft-milk);
      border-radius: 24px;
      padding: 32px;
    }

    .solution-row.reverse {
      direction: rtl;
    }

    .solution-row.reverse .solution-text {
      direction: ltr;
    }

    .solution-img {
      border-radius: 12px;
      overflow: hidden;
    }

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

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
      color: var(--text-charcoal);
    }

    .feature-list li::before {
      content: "✓";
      color: var(--success-emerald);
      font-weight: bold;
    }

    /* 成果 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .result-card {
      background: white;
      padding: 32px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .result-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent-champagne);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--accent-champagne);
    }

    .quote {
      font-style: italic;
      margin-bottom: 20px;
      color: var(--text-charcoal);
    }

    .author {
      font-weight: 600;
    }

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

    .faq-item {
      background: var(--faq-bg);
      border-radius: var(--radius-faq);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--primary-deep-purple);
    }

    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: var(--primary-deep-purple);
      text-align: center;
      padding: 90px 20px;
      color: white;
    }

    .cta-section h2 {
      color: white;
    }

    /* Footer */
    .site-footer {
      background: var(--primary-deep-purple);
      color: var(--footer-text);
      padding: 60px 0 20px;
    }

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

    .footer-links a {
      display: block;
      margin-bottom: 8px;
    }

    .footer-links a:hover {
      color: var(--accent-champagne);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .solution-row {
        grid-template-columns: 1fr;
      }
      .pain-grid, .results-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      h1 { font-size: 30px; }
      h2 { font-size: 24px; }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 480px) {
      .pain-grid, .results-grid {
        grid-template-columns: 1fr;
      }
      .btn-group {
        flex-direction: column;
        align-items: stretch;
      }
    }