/* roulang page: index */
:root {
      --primary: #0B3D91;
      --accent-blue: #00A8E8;
      --accent-gold: #F5A623;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-main: #1A1A2E;
      --text-secondary: #5A6A7E;
      --success: #2ECC71;
      --danger: #E74C3C;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(11,61,145,0.06);
      --shadow-hover: 0 8px 30px rgba(11,61,145,0.12);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "Segoe UI", Roboto, sans-serif;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      outline: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(11,61,145,0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo i {
      color: var(--accent-blue);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }

    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-blue);
      border-bottom-color: var(--accent-blue);
      font-weight: 600;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 4px;
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 1.5rem 2rem;
      box-shadow: 0 12px 30px rgba(0,0,0,0.08);
      display: none;
      z-index: 999;
      border-top: 1px solid #eee;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      padding: 0.9rem 0;
      font-size: 1.1rem;
      border-bottom: 1px solid #f0f2f5;
      font-weight: 500;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: var(--nav-height);
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,61,145,0.7) 0%, rgba(11,61,145,0.25) 70%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
      color: white;
    }
    .hero h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-blue);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #0096C7;
      box-shadow: 0 8px 18px rgba(0,168,232,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px 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-image {
      flex: 1 1 360px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.3));
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 2.5rem;
    }
    .pain-card {
      background: var(--card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--accent-blue);
    }

    /* 解决方案 */
    .solutions-grid {
      display: flex;
      gap: 24px;
      margin-top: 2.5rem;
    }
    .solution-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      flex: 1;
      transition: all 0.25s;
    }
    .solution-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-item img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .solution-content {
      padding: 20px 24px;
    }

    /* 数据深色条 */
    .results {
      background: var(--primary);
      color: white;
      text-align: center;
    }
    .stats {
      display: flex;
      justify-content: center;
      gap: 4rem;
      flex-wrap: wrap;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 证言轮播感 */
    .testimonials-grid {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
    }
    .testimonial-card {
      min-width: 280px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
      object-fit: cover;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(120deg, #0B3D91, #004080);
      color: white;
      text-align: center;
      border-radius: 0;
    }
    .btn-gold {
      background: var(--accent-gold);
      color: #1A1A2E;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      margin-top: 20px;
    }

    /* Footer */
    .footer {
      background: #0B2A5E;
      color: rgba(255,255,255,0.85);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .pain-grid, .solutions-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2rem; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }