/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-dark: #3A54D4;
      --accent: #00E5FF;
      --accent-glow: rgba(0, 229, 255, 0.25);
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg-page: #F5F6FA;
      --bg-white: #FFFFFF;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E5E8EF;
      --shadow-card: 0 8px 24px rgba(31, 35, 41, 0.06);
      --shadow-elevated: 0 16px 32px rgba(31, 35, 41, 0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 40px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

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

    /* 按钮体系 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 500;
      font-size: 16px;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      background: transparent;
      white-space: nowrap;
      line-height: 1.2;
      letter-spacing: 0.3px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      color: white;
      box-shadow: 0 10px 20px -8px rgba(78, 110, 242, 0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 16px 28px -8px rgba(78, 110, 242, 0.55);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(78, 110, 242, 0.04);
      border-color: var(--accent);
      color: var(--accent);
    }

    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 600;
      box-shadow: 0 8px 18px rgba(0,0,0,0.06);
    }

    .btn-white:hover {
      background: #f0f4ff;
      transform: translateY(-2px);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: var(--header-height);
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(229, 232, 239, 0.5);
      transition: background 0.3s;
    }

    .header.scrolled {
      background: rgba(255,255,255,0.9);
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }

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

    .logo {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.5px;
    }

    .logo span {
      color: var(--accent);
      font-weight: 700;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-primary);
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-cta {
      margin-left: 16px;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-primary);
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);
      z-index: 0;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-content h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--text-primary);
    }

    .hero-highlight {
      background: linear-gradient(135deg, var(--accent), var(--primary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

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

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 420px;
      box-shadow: var(--shadow-elevated);
      position: relative;
    }

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

    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
      text-align: center;
    }

    .section-sub {
      font-size: 18px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
    }

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

    .pain-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      border-left: 4px solid transparent;
    }

    .pain-card:hover {
      transform: translateY(-6px);
      border-left-color: var(--accent);
      box-shadow: var(--shadow-elevated);
    }

    .pain-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    /* 解决方案 不对称网格 */
    .solution-showcase {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 32px;
    }

    .solution-main {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-card);
      position: relative;
      overflow: hidden;
    }

    .solution-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .solution-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      display: flex;
      gap: 16px;
      align-items: flex-start;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }

    .solution-item:hover {
      box-shadow: var(--shadow-elevated);
      transform: translateY(-3px);
    }

    .stat-badge {
      font-size: 14px;
      background: rgba(0,229,255,0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }

    /* 案例/数据 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-content {
      padding: 24px;
    }

    /* 证言 */
    .testimonial-slider {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }

    .testimonial {
      min-width: 300px;
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }

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

    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-primary);
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }

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

    .faq-item.open .faq-question {
      color: var(--primary);
    }

    /* 终局CTA */
    .cta-section {
      background: linear-gradient(135deg, var(--primary) 0%, #2b3fa0 100%);
      border-radius: 32px;
      padding: 64px 40px;
      text-align: center;
      color: white;
      margin: 60px 0;
    }

    .footer {
      background: #1F2329;
      color: #86909C;
      padding: 48px 0 24px;
    }

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

    .footer a {
      color: #86909C;
      transition: color 0.2s;
    }

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

    @media (max-width: 1024px) {
      .hero-grid, .solution-showcase {
        grid-template-columns: 1fr;
      }
      .pain-grid {
        grid-template-columns: 1fr 1fr;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }

    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 38px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }