/* roulang page: index */
:root {
      --primary: #1A3C6D;
      --accent: #E8473A;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-soft: #64748B;
      --border: #E2E8F0;
      --success: #10B981;
      --disabled: #94A3B8;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav-bar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-main);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background: #C0392B;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
    }
    /* Hero */
    .hero {
      padding: 80px 0;
      background: linear-gradient(180deg, #FFFFFF 0%, #F0F4FA 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 400px;
      box-shadow: var(--shadow-sm);
    }
    /* 信任条 */
    .trust-bar {
      background: white;
      padding: 40px 0;
      border-bottom: 1px solid var(--border);
    }
    .trust-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .trust-item h3 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-number);
    }
    .trust-item p {
      color: var(--text-soft);
      font-weight: 500;
    }
    /* 亮点网格 */
    .features {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-soft);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 56px;
    }
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--accent);
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    /* 案例瀑布流 */
    .cases {
      padding: 100px 0;
      background: white;
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s ease;
      border: 1px solid var(--border);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: #FEE2E2;
      color: var(--accent);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .case-card h3 {
      font-weight: 600;
      margin-bottom: 8px;
    }
    /* 方案对比 */
    .compare {
      padding: 100px 0;
    }
    .compare-table {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      flex: 1;
      min-width: 260px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
    }
    .compare-col.highlight {
      border-left: 6px solid var(--primary);
      background: #F0F4FA;
    }
    .compare-col h3 {
      font-size: 1.5rem;
      margin-bottom: 20px;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }
    /* FAQ */
    .faq {
      padding: 100px 0;
      background: white;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-soft);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA 横幅 */
    .cta-band {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      font-size: 2.25rem;
      margin-bottom: 16px;
    }
    /* 页脚 */
    .footer {
      background: #0F2B4F;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #CBD5E1;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .feature-grid { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: repeat(2,1fr); }
      .hero-grid { flex-direction: column; }
      .hero-image { min-height: 300px; width: 100%; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        padding: 24px;
        box-shadow: var(--shadow-sm);
      }
      .mobile-menu.open { display: flex; }
      .feature-grid { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2.25rem !important; }
      h2 { font-size: 1.75rem !important; }
    }