/* roulang page: index */
:root {
      --primary: #0F172A;
      --secondary: #7C3AED;
      --accent: #F59E0B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-dark: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-light: #CBD5E1;
      --border: #E2E8F0;
      --border-light: #F1F5F9;
      --shadow-sm: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px 0 rgba(0,0,0,0.06);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
      --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-full: 9999px;
      --transition: 0.2s ease;
      --font-sans: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .header {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      gap: 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: -0.02em;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--secondary), #5B21B6);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #475569;
      transition: color var(--transition);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover {
      color: var(--secondary);
    }

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

    .search-box {
      display: flex;
      align-items: center;
      background: #F1F5F9;
      border-radius: var(--radius-full);
      padding: 8px 18px;
      gap: 8px;
      color: #64748B;
    }

    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 120px;
    }

    .btn {
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 14px;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: none;
      white-space: nowrap;
    }

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

    .btn-primary:hover {
      background: #6D28D9;
      box-shadow: var(--shadow-md);
    }

    .btn-outline-light {
      background: transparent;
      border: 1px solid white;
      color: white;
    }

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

    .btn-white {
      background: white;
      color: var(--secondary);
      border: 1px solid white;
    }

    .btn-white:hover {
      background: #F1F5F9;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }

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

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }

    .section-lead {
      font-size: 18px;
      color: #475569;
      margin-bottom: 48px;
      max-width: 680px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F172A 0%, #4C1D95 100%);
      position: relative;
      overflow: hidden;
      padding: 120px 0;
      color: white;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }

    .hero-badges {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }

    .badge-item {
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .badge-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--accent);
    }

    .badge-label {
      font-size: 14px;
      opacity: 0.8;
    }

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
    }

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

    .pain-card {
      background: var(--bg-white);
      border-left: 4px solid var(--secondary);
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }

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

    .pain-card h4 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--primary);
    }

    /* 解决方案步骤 */
    .steps {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .step-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 32px;
      display: flex;
      gap: 32px;
      align-items: flex-start;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .step-icon {
      width: 56px;
      height: 56px;
      background: #EDE9FE;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 28px;
      flex-shrink: 0;
    }

    /* 数据墙 */
    .data-wall {
      background: #F8FAFC;
      padding: 80px 0;
      border-radius: var(--radius-lg);
    }

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

    .data-badge {
      background: white;
      padding: 32px 16px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .data-badge:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }

    .data-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
    }

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

    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .testimonial-text {
      font-style: italic;
      margin-bottom: 20px;
      color: #334155;
    }

    .author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar {
      width: 44px;
      height: 44px;
      background: #E2E8F0;
      border-radius: 50%;
      background-image: url('/assets/images/coverpic/cover-4.webp');
      background-size: cover;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 22px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
      border-radius: var(--radius-md);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFC;
      padding: 0 28px;
      color: #334155;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 28px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0F172A 0%, #7C3AED 100%);
      padding: 100px 0;
      text-align: center;
      color: white;
      border-radius: 0;
    }

    .footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 48px 0;
    }

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

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

    @media (max-width: 768px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .container {
        padding: 0 20px;
      }
      section {
        padding: 64px 0;
      }
      .hero {
        padding: 80px 0;
      }
      .hero h1 {
        font-size: 32px;
      }
      .pain-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .steps {
        gap: 20px;
      }
      .step-card {
        flex-direction: column;
      }
      .badge-grid {
        grid-template-columns: 1fr 1fr;
      }
      .data-number {
        font-size: 36px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }