/* roulang page: index */
:root {
      --primary: #0A2540;
      --secondary: #00B4D8;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --gradient: linear-gradient(135deg, #0A2540 0%, #00B4D8 100%);
      --success: #059669;
      --error: #DC2626;
      --border: #E2E8F0;
      --shadow-sm: 0 4px 16px rgba(10,37,64,0.06);
      --shadow-md: 0 8px 24px rgba(10,37,64,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-badge: 6px;
      --max-width: 1200px;
      --nav-height: 72px;
      --section-gap: 100px;
      --title-gap: 48px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #main-nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: white;
      height: var(--nav-height);
      display: flex;
      align-items: center;
      box-shadow: 0 1px 0 var(--border);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      transition: color 0.2s;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--secondary);
      border-bottom-color: var(--secondary);
    }
    .btn-primary {
      background: var(--gradient);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.2s, box-shadow 0.2s;
      cursor: pointer;
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(0,180,216,0.25);
    }
    .btn-primary:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 18px rgba(0,180,216,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: background 0.2s, color 0.2s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(10,37,64,0.05);
    }
    .btn-white-outline {
      border: 1.5px solid white;
      color: white;
      background: transparent;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
    }
    .btn-white-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,37,64,0.7) 0%, rgba(0,180,216,0.4) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
      color: white;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-content .subtitle {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 40px;
      line-height: 1.5;
    }
    /* 通用板块 */
    section {
      padding: var(--section-gap) 24px;
    }
    .section-title {
      text-align: center;
      font-size: 32px;
      font-weight: 600;
      margin-bottom: var(--title-gap);
      color: var(--primary);
    }
    /* 痛点卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .pain-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      background: rgba(0,180,216,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 28px;
    }
    .pain-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    /* 解决方案交错 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-text h3 {
      font-size: 26px;
      margin-bottom: 16px;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .solution-img img {
      width: 100%;
      height: auto;
      aspect-ratio: 16/10;
      object-fit: cover;
    }
    .text-link {
      color: var(--secondary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 12px;
    }
    /* 成果数据 */
    #results {
      background: rgba(10,37,64,0.03);
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item .number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-item .unit {
      font-size: 18px;
      color: var(--text-secondary);
      margin-left: 4px;
    }
    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }
    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
    }
    .quote-icon {
      color: var(--secondary);
      font-size: 32px;
      margin-bottom: 12px;
    }
    .testimonial-text {
      font-style: italic;
      margin-bottom: 20px;
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #E2E8F0;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #F1F5F9;
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
      overflow: hidden;
      transition: 0.2s;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 18px;
      background: transparent;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open {
      border-left: 4px solid var(--secondary);
      background: white;
    }
    /* CTA */
    #cta {
      background: var(--gradient);
      text-align: center;
      color: white;
    }
    #cta h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }
    /* 页脚 */
    #footer {
      background: var(--primary);
      color: #CBD5E1;
      padding: 60px 24px 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 10px;
      color: #CBD5E1;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.2);
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }
    @media (max-width: 1024px) {
      .cards-grid, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
      .solution-row { gap: 32px; }
    }
    @media (max-width: 768px) {
      :root { --section-gap: 60px; --title-gap: 32px; }
      .hamburger { display: flex; }
      .nav-links {
        position: fixed; top: 72px; left: 0; width: 100%; height: calc(100vh - 72px);
        background: white; flex-direction: column; align-items: center; justify-content: center;
        gap: 32px; display: none; z-index: 40;
      }
      .nav-links.active { display: flex; }
      .cards-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .hero-content h1 { font-size: 32px; }
      .stats-grid { gap: 24px; }
      .stat-item .number { font-size: 36px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .btn-primary, .btn-outline, .btn-white-outline { width: 100%; max-width: 280px; margin: 0 auto; }
    }