/* roulang page: index */
:root {
      --primary: #0A3D2E;
      --primary-light: #1B5E46;
      --accent: #F5A623;
      --accent-hover: #E08C0E;
      --bg-light: #F7F9F6;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #5C6B63;
      --border: #DDE5DF;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(10, 61, 46, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 61, 46, 0.12);
      --shadow-btn: 0 6px 18px rgba(245, 166, 35, 0.35);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
      --spacing-section: 100px;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--white);
      height: 72px;
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 18px;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-size: 15px;
      font-weight: 500;
      padding: 8px 0;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent);
      border-radius: 3px 3px 0 0;
    }

    .btn-nav {
      background: var(--accent);
      color: var(--white) !important;
      border-radius: 40px;
      padding: 10px 22px !important;
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
      transition: all 0.2s;
    }

    .btn-nav:hover {
      background: var(--accent-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(10,61,46,0.97);
      backdrop-filter: blur(8px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      z-index: 999;
    }

    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 500;
      text-decoration: none;
    }

    .mobile-menu .btn-nav {
      background: var(--accent);
      color: var(--white);
      padding: 14px 32px;
      font-size: 18px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A3D2E 0%, #1B5E46 40%, #0D4A35 100%);
      color: white;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-image {
      flex: 1 1 45%;
      position: relative;
      min-height: 360px;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    .hero-image::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(180deg, rgba(10,61,46,0.3) 0%, rgba(0,0,0,0.1) 100%);
    }

    .hero h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 16px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

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

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

    .btn-primary {
      background: var(--accent);
      color: var(--white);
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.2s;
      box-shadow: var(--shadow-btn);
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }

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

    .floating-badge {
      position: absolute;
      bottom: 30px;
      right: 30px;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border-radius: 50px;
      padding: 12px 24px;
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 18px;
      color: var(--accent);
      border: 1px solid rgba(255,255,255,0.25);
    }

    /* 数据徽章带 */
    .stats-band {
      background: var(--white);
      padding: 40px 0;
      border-bottom: 1px solid var(--border);
    }

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

    .stat-item .stat-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 40px;
      background: linear-gradient(135deg, #F5A623, #E8961A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .stat-label {
      font-size: 15px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 通用区块 */
    .section {
      padding: var(--spacing-section) 0;
    }

    .section h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
      text-align: center;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto 48px;
    }

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

    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }

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

    .card-icon {
      width: 56px;
      height: 56px;
      background: rgba(245,166,35,0.12);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 24px;
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .card p {
      color: var(--text-muted);
      font-size: 15px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 30px;
    }

    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }

    .step-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 48px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .step h4 {
      font-weight: 600;
      font-size: 18px;
    }

    .step p {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: 0.2s;
    }

    .case-card:hover {
      transform: translateY(-4px);
    }

    .case-img {
      height: 140px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 16px;
    }

    .case-info h4 {
      font-weight: 600;
    }

    .tag {
      display: inline-block;
      background: rgba(245,166,35,0.15);
      color: #b45f06;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      margin-top: 6px;
    }

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

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      font-size: 15px;
      margin-top: 12px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A3D2E, #0D4A35);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .cta-section h2 {
      color: white;
    }

    .trust-note {
      margin-top: 24px;
      font-size: 13px;
      opacity: 0.8;
    }

    /* Footer */
    .footer {
      background: #0A2E22;
      color: #cfd8d3;
      padding: 60px 0 30px;
    }

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

    .footer a {
      color: #cfd8d3;
      text-decoration: none;
      font-size: 14px;
    }

    .footer-bottom {
      border-top: 1px solid #1e4a3a;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .hero h1 { font-size: 36px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-image { min-height: 280px; width: 100%; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .card-grid { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; }
      .case-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 30px; }
      .btn-primary, .btn-outline { width: 100%; max-width: 280px; display: block; margin: 8px auto; }
    }