/* roulang page: index */
:root {
      --primary: #0F4C5C;
      --primary-light: #1A6B7A;
      --secondary: #F49D37;
      --secondary-light: #F2C94C;
      --bg-white: #FAFBFB;
      --card-white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-muted: #4A5568;
      --border-light: #E2E8F0;
      --success: #38A169;
      --danger: #E53E3E;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-glow: 0 8px 30px rgba(15,76,92,0.25);
      --radius-xl: 20px;
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-heading: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --transition: 0.2s ease;
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-white);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.8);
      transition: background 0.3s, box-shadow 0.3s;
      border-bottom: 1px solid transparent;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 2px 20px rgba(0,0,0,0.05);
      border-bottom-color: var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .btn-primary {
      background: linear-gradient(135deg, #F49D37 0%, #F2C94C 100%);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(244,157,55,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 26px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: rgba(15,76,92,0.05);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 100px 32px 32px;
        gap: 28px;
        transition: right 0.3s ease;
        box-shadow: -5px 0 25px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .nav-links .btn-primary {
        width: 100%;
      }
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(135deg, #0F4C5C 0%, #1A6B7A 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      background: rgba(255,255,255,0.05);
      border-radius: 50%;
      top: -100px;
      right: -100px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      font-family: var(--font-heading);
    }
    .hero-text p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .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: var(--radius-xl);
      min-height: 360px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-image {
        width: 100%;
        min-height: 250px;
      }
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 12px auto 0;
    }
    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-white);
      padding: 32px;
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s, box-shadow 0.3s;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .badge {
      position: absolute;
      top: 20px;
      right: 20px;
      background: linear-gradient(135deg, #F49D37, #F2C94C);
      color: white;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.9rem;
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }
    @media (max-width: 992px) {
      .features-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 600px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .scenario-card {
      background: #F7F8FA;
      border-radius: var(--radius-xl);
      padding: 32px;
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .scenario-img {
      width: 120px;
      height: 120px;
      border-radius: var(--radius-lg);
      object-fit: cover;
    }
    .checklist {
      list-style: none;
      margin-top: 16px;
    }
    .checklist li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
      color: var(--text-muted);
    }
    .checklist i {
      color: var(--success);
    }
    @media (max-width: 768px) {
      .scenarios-grid {
        grid-template-columns: 1fr;
      }
      .scenario-card {
        flex-direction: column;
      }
    }
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .case-card {
      background: var(--card-white);
      border-radius: var(--radius-xl);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .case-logo {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .case-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
    }
    @media (max-width: 992px) {
      .cases-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 定价 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .pricing-card {
      background: var(--card-white);
      border-radius: var(--radius-xl);
      padding: 40px 28px;
      flex: 1 1 260px;
      max-width: 320px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.3s;
    }
    .pricing-card.featured {
      background: linear-gradient(135deg, #0F4C5C, #1A6B7A);
      color: white;
      transform: scale(1.05);
      box-shadow: var(--shadow-glow);
    }
    .price {
      font-size: 2.8rem;
      font-weight: 700;
      margin: 20px 0;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        flex-direction: column;
        align-items: center;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F7F8FA;
      padding: 0 24px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }
    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #0F4C5C, #1A6B7A);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .cta-form {
      display: flex;
      max-width: 480px;
      margin: 32px auto 0;
      gap: 12px;
    }
    .cta-form input {
      flex: 1;
      padding: 14px 20px;
      border-radius: var(--radius-md);
      border: none;
    }
    @media (max-width: 500px) {
      .cta-form {
        flex-direction: column;
      }
    }
    /* 页脚 */
    .footer {
      background: #0A2530;
      color: #CBD5E0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a {
      color: #CBD5E0;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: var(--secondary);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }