/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --accent: #E94560;
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5E;
      --text-muted: #7A7A8E;
      --border-light: #EAECF0;
      --shadow-sm: 0 8px 24px rgba(0,0,0,0.04);
      --shadow-md: 0 16px 40px rgba(0,0,0,0.06);
      --shadow-hover: 0 24px 48px rgba(0,0,0,0.09);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 40px;
      --max-width: 1280px;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航杂志频道式 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 50;
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      transition: box-shadow 0.3s;
    }
    .site-header.scrolled {
      box-shadow: 0 8px 28px rgba(0,0,0,0.05);
    }
    .header-inner {
      display: flex;
      flex-direction: column;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 16px 32px;
    }
    .brand-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
    }
    .logo i {
      color: var(--accent);
      font-size: 2rem;
      margin-right: 8px;
    }
    .logo span {
      font-weight: 400;
      font-size: 1rem;
      color: var(--text-secondary);
      margin-left: 6px;
      letter-spacing: 0.5px;
    }
    .social-icons i {
      font-size: 1.2rem;
      margin-left: 18px;
      color: var(--text-muted);
      transition: color 0.2s;
      cursor: pointer;
    }
    .social-icons i:hover {
      color: var(--accent);
    }
    .channel-row {
      display: flex;
      gap: 32px;
      margin-top: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 12px;
      flex-wrap: wrap;
    }
    .channel-row a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .channel-row a.active,
    .channel-row a:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .channel-row {
        display: none;
        flex-direction: column;
        gap: 16px;
        background: white;
        padding: 24px;
        border-radius: 20px;
        margin-top: 16px;
        box-shadow: var(--shadow-md);
      }
      .channel-row.open {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .social-icons {
        display: flex;
        align-items: center;
      }
    }

    /* Hero */
    .hero {
      padding: 150px 0 80px;
      background: linear-gradient(135deg, rgba(26,26,46,0.03) 0%, rgba(233,69,96,0.02) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 480px;
    }
    .hero-content h1 {
      font-size: clamp(2.5rem, 6vw, 3.6rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-highlight {
      color: var(--accent);
      border-bottom: 4px solid rgba(233,69,96,0.3);
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 8px 20px rgba(233,69,96,0.3);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: #d63750;
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(233,69,96,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(26,26,46,0.05);
      border-color: var(--accent);
      color: var(--accent);
    }
    .hero-visual {
      flex: 1 1 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      min-height: 320px;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    @media (max-width: 768px) {
      .hero {
        padding: 130px 0 60px;
      }
      .hero-visual {
        min-height: 260px;
        width: 100%;
      }
    }

    /* 数据看板 */
    .stats-board {
      padding: 50px 0;
      background: white;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      gap: 24px;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-item {
      flex: 1 1 150px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 4px;
    }
    .stat-number span {
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
      margin-top: 8px;
    }

    /* 服务矩阵 错层布局 */
    .services {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 40px;
    }
    .service-matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-card.large {
      grid-column: span 2;
      background: var(--primary);
      color: white;
      flex-direction: row;
      align-items: center;
      gap: 32px;
    }
    .service-card.large h3 {
      color: white;
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .service-card.large .service-icon {
      color: white;
      background: rgba(255,255,255,0.15);
      padding: 16px;
      border-radius: 20px;
      font-size: 2.8rem;
    }
    .service-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }
    @media (max-width: 900px) {
      .service-matrix {
        grid-template-columns: 1fr;
      }
      .service-card.large {
        grid-column: span 1;
        flex-direction: column;
      }
    }

    /* 对比表 */
    .compare {
      padding: 80px 0;
      background: white;
    }
    .compare-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1 1 280px;
      background: #f2f3f7;
      border-radius: var(--radius-lg);
      padding: 32px;
    }
    .compare-col.best {
      background: #fff5f6;
      border: 2px solid var(--accent);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 14px 0;
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .accordion-header {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafbfc;
      padding: 0 24px;
    }
    .accordion-content p {
      padding: 16px 0;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-block {
      background: var(--accent);
      padding: 70px 0;
      text-align: center;
      color: white;
      border-radius: 40px 40px 0 0;
    }
    .cta-block h2 {
      font-size: 2.4rem;
      margin-bottom: 16px;
    }
    .btn-white {
      background: white;
      color: var(--accent);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      margin-top: 24px;
      display: inline-block;
    }

    footer {
      background: var(--primary);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }