/* roulang page: index */
:root {
      --primary: #0A6E7A;
      --primary-dark: #085560;
      --primary-light: rgba(10, 110, 122, 0.05);
      --gold: #C49B4C;
      --gold-light: rgba(196, 155, 76, 0.15);
      --bg: #F7F8FA;
      --white: #FFFFFF;
      --text: #1F2937;
      --text-light: #6B7280;
      --border: #E5E7EB;
      --radius-sm: 8px;
      --radius: 12px;
      --shadow: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
      --section-gap: 90px;
      --nav-height: 68px;
      --max-width: 1200px;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--nav-height);
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-stack);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-size: 16px;
      outline: none;
    }

    button:focus-visible, .btn:focus-visible, a:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 2px;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--white);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      transition: box-shadow var(--transition);
      display: flex;
      align-items: center;
    }

    .nav.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
      border-bottom-color: var(--border);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      font-size: 24px;
      color: var(--gold);
    }

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

    .nav-links a {
      color: var(--text);
      font-weight: 500;
      font-size: 15px;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

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

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      color: white;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--text);
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 24px 0;
        gap: 20px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        transform: translateY(-110%);
        opacity: 0;
        transition: transform 0.35s ease, opacity 0.35s ease;
        z-index: 999;
        pointer-events: none;
      }

      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }

      .hamburger {
        display: flex;
      }
    }

    /* 首屏 Hero */
    .hero {
      background: linear-gradient(135deg, rgba(10,110,122,0.92) 0%, rgba(10,110,122,0.55) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      padding: 130px 0 110px;
      text-align: center;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-content {
      max-width: 800px;
      margin: 0 auto;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 18px;
      letter-spacing: 1px;
      color: white;
    }

    .hero-subtitle {
      font-size: 20px;
      margin-bottom: 36px;
      opacity: 0.92;
      font-weight: 400;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 8px 18px rgba(10,110,122,0.3);
    }

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

    .btn-outline {
      border: 2px solid rgba(255,255,255,0.9);
      color: white;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
    }

    .hero-image {
      margin-top: 50px;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.2);
      max-width: 750px;
      margin-left: auto;
      margin-right: auto;
    }

    @media (max-width: 768px) {
      .hero h1 { font-size: 34px; }
      .hero { padding: 90px 0 70px; }
    }

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

    .section-header {
      text-align: center;
      margin-bottom: 56px;
    }

    .section-header h2 {
      font-size: 34px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 14px;
    }

    .section-header p {
      color: var(--text-light);
      font-size: 17px;
      max-width: 640px;
      margin: 0 auto;
    }

    /* 核心服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: start;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow);
      transition: var(--transition);
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .service-card.featured {
      transform: scale(1.03);
      box-shadow: 0 10px 30px rgba(10,110,122,0.08);
    }

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

    .service-card.featured:hover {
      transform: scale(1.03) translateY(-4px);
    }

    .service-icon {
      width: 68px;
      height: 68px;
      background: var(--primary-light);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 22px;
    }

    .service-icon img {
      width: 38px;
      height: 38px;
      object-fit: contain;
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .service-card p {
      color: var(--text-light);
      font-size: 15px;
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .text-link:hover {
      color: var(--primary-dark);
    }

    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .service-card.featured {
        transform: none;
      }
    }

    /* 优势数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-item {
      padding: 20px 0;
      border-right: 1px solid var(--border);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--gold);
      display: block;
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-light);
      font-size: 15px;
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(even) {
        border-right: none;
      }
    }

    /* 运营案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }

    .case-img {
      height: 200px;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-body {
      padding: 24px;
    }

    .case-tag {
      display: inline-block;
      background: var(--gold-light);
      color: #8B6914;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .case-body h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 流程方案区 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

    .process-steps::before {
      content: '';
      position: absolute;
      top: 30px;
      left: 10%;
      right: 10%;
      height: 2px;
      background: dashed #D1D5DB;
      z-index: 0;
    }

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

    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 22px;
      margin-bottom: 18px;
      box-shadow: 0 6px 18px rgba(10,110,122,0.4);
    }

    .step h3 {
      font-size: 19px;
      margin-bottom: 6px;
    }

    .step p {
      color: var(--text-light);
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 32px;
        align-items: center;
      }
      .process-steps::before {
        display: none;
      }
    }

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

    .faq-item {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      margin-bottom: 12px;
      background: var(--white);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: none;
      font-size: 17px;
      font-weight: 600;
      text-align: left;
      color: var(--text);
      gap: 12px;
    }

    .faq-indicator {
      color: var(--primary);
      font-weight: 700;
      margin-right: 10px;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-light);
      display: none;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-question i {
      transform: rotate(180deg);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: white;
      text-align: center;
      padding: 70px 0;
      border-radius: var(--radius);
      margin: 0 20px;
    }

    .cta-banner h2 {
      font-size: 34px;
      margin-bottom: 14px;
    }

    .cta-banner p {
      margin-bottom: 28px;
      opacity: 0.9;
    }

    .btn-gold {
      background: var(--gold);
      color: white;
      font-weight: 700;
    }

    .btn-gold:hover {
      background: #b08538;
    }

    /* 页脚 */
    .footer {
      background: #1F2937;
      color: #D1D5DB;
      padding: 60px 0 30px;
      margin-top: 70px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 40px;
    }

    .footer-col h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 16px;
    }

    .footer-col a {
      color: #9CA3AF;
      display: block;
      margin-bottom: 10px;
      font-size: 14px;
    }

    .footer-col a:hover {
      color: white;
    }

    .copyright {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid #374151;
      text-align: center;
      font-size: 14px;
      color: #9CA3AF;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }