/* roulang page: index */
:root {
      --primary: #0A6E79;
      --primary-dark: #06555E;
      --primary-light: #F0F9FA;
      --accent: #F59E0B;
      --accent-hover: #D97706;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-soft: #64748B;
      --text-light: #334155;
      --border: #E2E8F0;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.08);
      --radius-lg: 16px;
      --radius-full: 50px;
      --radius-md: 8px;
      --transition: 0.25s ease;
      --container: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
    }
    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 24px;
      }
    }

    /* 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(16px);
      box-shadow: 0 1px 0 var(--border);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: -0.2px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary) 0%, #0B8A96 100%);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-soft);
      font-weight: 500;
      font-size: 15px;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta-mobile {
      display: none;
    }
    @media (max-width: 768px) {
      .header {
        top: auto;
        bottom: 0;
        height: auto;
        background: rgba(255,255,255,0.96);
        box-shadow: 0 -2px 10px rgba(0,0,0,0.04);
        backdrop-filter: blur(20px);
      }
      .nav {
        flex-direction: column;
      }
      .nav-links {
        display: flex;
        justify-content: space-around;
        width: 100%;
        padding: 8px 16px;
        gap: 0;
        overflow-x: auto;
        white-space: nowrap;
      }
      .nav-links a {
        font-size: 13px;
        padding: 10px 6px;
        border-bottom: none;
      }
      .logo {
        display: none;
      }
      .nav-cta-mobile {
        display: block;
      }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      margin-bottom: 48px;
    }
    .section-title h2 {
      color: var(--text);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-soft);
      font-size: 18px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-text h1 {
      color: var(--text);
      margin-bottom: 20px;
    }
    .hero-text h1 span {
      background: linear-gradient(135deg, var(--primary) 0%, #0D9488 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      border-color: var(--accent-hover);
      box-shadow: 0 8px 18px rgba(245, 158, 11, 0.3);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 420px;
      position: relative;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,110,121,0.08);
      border-radius: inherit;
    }
    .hero-stat {
      background: white;
      border-radius: 16px;
      padding: 16px 24px;
      box-shadow: var(--shadow-card);
      font-weight: 700;
      color: var(--primary);
      font-size: 28px;
      position: relative;
      z-index: 2;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    @media (max-width: 768px) {
      .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-visual {
        height: 280px;
      }
      .hero {
        padding: 120px 0 70px;
      }
    }

    /* 数据看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px 16px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .metric-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--primary);
    }
    .metric-label {
      color: var(--text-soft);
      font-size: 14px;
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 服务非对称布局 */
    .service-wrapper {
      display: grid;
      grid-template-columns: 1.3fr 1fr;
      gap: 32px;
    }
    .service-main {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
    }
    .service-main:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-main img {
      border-radius: 12px;
      margin: 20px 0;
    }
    .service-side {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .service-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      gap: 16px;
      transition: var(--transition);
    }
    .service-item:hover {
      box-shadow: var(--shadow-hover);
    }
    .service-dot {
      width: 10px;
      height: 10px;
      background: var(--border);
      border-radius: 50%;
      transition: var(--transition);
    }
    .service-item:hover .service-dot {
      background: var(--accent);
    }
    @media (max-width: 768px) {
      .service-wrapper {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .comparison-table {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .comp-row {
      display: grid;
      grid-template-columns: 200px 1fr 1fr;
      border-bottom: 1px solid var(--border);
    }
    .comp-row:last-child {
      border-bottom: none;
    }
    .comp-cell {
      padding: 18px 20px;
      display: flex;
      align-items: center;
    }
    .comp-header {
      font-weight: 700;
      background: var(--primary-light);
      color: var(--primary);
    }
    .check-green {
      color: #10B981;
      font-weight: 700;
    }
    .cross-red {
      color: #EF4444;
    }
    @media (max-width: 768px) {
      .comp-row {
        grid-template-columns: 1fr 1fr;
      }
      .comp-cell:first-child {
        display: none;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-icon {
      font-size: 22px;
      transition: transform 0.3s;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, background 0.3s;
      background: white;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      background: var(--primary-light);
      padding: 20px 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 联系卡片 */
    .contact-card {
      background: var(--primary);
      border-radius: var(--radius-lg);
      padding: 48px;
      color: white;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .contact-form input,
    .contact-form textarea {
      width: 100%;
      padding: 14px 16px;
      border-radius: var(--radius-md);
      border: 1px solid transparent;
      background: rgba(255,255,255,0.15);
      color: white;
      margin-bottom: 16px;
      outline: none;
    }
    .contact-form input::placeholder,
    .contact-form textarea::placeholder {
      color: rgba(255,255,255,0.7);
    }
    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: white;
    }
    .btn-submit {
      background: var(--accent);
      color: white;
      border: none;
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-full);
      font-weight: 700;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .contact-card {
        grid-template-columns: 1fr;
      }
    }

    /* Footer */
    .footer {
      background: white;
      padding: 48px 0;
      border-top: 1px solid var(--border);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    .footer-links a {
      margin-right: 24px;
      color: var(--text-soft);
    }