/* roulang page: index */
:root {
      --primary: #0f6b8c;
      --primary-dark: #094c63;
      --accent: #c49a2b;
      --accent-light: #d9af3a;
      --text-primary: #2c3a4b;
      --text-secondary: #5e6f82;
      --text-light: #b0b8c1;
      --bg-light: #f7f9fc;
      --bg-white: #ffffff;
      --border-light: #e0e4e8;
      --shadow-sm: 0 4px 16px rgba(0,0,0,0.05);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.1);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 30px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Segoe UI", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-white);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航胶囊 */
    .capsule-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 720px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-radius: var(--radius-pill);
      padding: 8px 24px;
      box-shadow: 0 2px 20px rgba(0,0,0,0.08);
      z-index: 99;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 24px;
      flex-wrap: wrap;
    }
    .capsule-nav a {
      font-size: 14px;
      font-weight: 500;
      color: #1e2a3a;
      text-decoration: none;
      padding: 6px 4px;
      position: relative;
      transition: color var(--transition);
      white-space: nowrap;
    }
    .capsule-nav a:hover,
    .capsule-nav a.active {
      color: var(--primary);
    }
    .capsule-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .capsule-nav a:hover::after,
    .capsule-nav a.active::after {
      width: 100%;
    }
    .logo-text {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: 0.5px;
      margin-right: 16px;
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .logo-icon {
      font-size: 24px;
      color: var(--primary);
    }
    @media (max-width: 640px) {
      .capsule-nav {
        top: auto;
        bottom: 12px;
        width: 92%;
        max-width: 92%;
        padding: 8px 16px;
        gap: 12px;
        overflow-x: auto;
        justify-content: flex-start;
        flex-wrap: nowrap;
        border-radius: 40px;
        background: rgba(255,255,255,0.92);
      }
      .logo-text {
        font-size: 18px;
        margin-right: 8px;
      }
      .capsule-nav a {
        font-size: 13px;
      }
    }
    /* Hero */
    #hero {
      height: 90vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(15,107,140,0.35) 0%, rgba(9,76,99,0.2) 70%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-left: 8%;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.25);
    }
    .hero-content .subtitle {
      font-size: 20px;
      line-height: 1.5;
      margin-bottom: 32px;
      opacity: 0.92;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      transition: background var(--transition);
    }
    .btn-accent:hover {
      background: var(--accent-light);
      color: white;
    }
    @media (max-width: 640px) {
      #hero {
        height: 85vh;
        min-height: 500px;
      }
      .hero-content {
        margin: 0 20px;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .hero-content .subtitle {
        font-size: 16px;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 56px;
      font-size: 18px;
    }
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
      .section-title {
        font-size: 28px;
      }
      .section-sub {
        font-size: 16px;
        margin-bottom: 36px;
      }
    }
    /* 卡片 */
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      overflow: hidden;
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .card img {
      width: 100%;
      display: block;
      border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    }
    .card-body {
      padding: 24px;
    }
    .service-link {
      color: var(--primary);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    /* 优势数据 */
    .stat-block {
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 32px 16px;
      text-align: center;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      display: block;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 16px;
      margin-top: 8px;
    }
    /* 案例卡片 */
    .case-card img {
      transition: transform 0.3s ease;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .tag {
      background: rgba(15,107,140,0.1);
      color: var(--primary);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
    }
    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }
    .accordion-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid transparent;
    }
    .accordion-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
      line-height: 1.7;
    }
    .accordion-item.active .accordion-question {
      color: var(--primary);
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-item.active .accordion-answer {
      display: block;
    }
    /* 表单 */
    .contact-form input,
    .contact-form textarea {
      background: rgba(255,255,255,0.15);
      border: 1px solid rgba(255,255,255,0.35);
      border-radius: var(--radius-sm);
      color: white;
      padding: 14px;
      margin-bottom: 16px;
    }
    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: white;
      box-shadow: 0 0 0 3px rgba(255,255,255,0.2);
      outline: none;
    }
    .contact-form ::placeholder {
      color: rgba(255,255,255,0.7);
    }
    footer {
      background: #1a1f2b;
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    footer a {
      color: var(--text-light);
      text-decoration: none;
    }
    footer a:hover {
      color: white;
    }
    .social-icon {
      width: 36px;
      height: 36px;
      border: 1px solid var(--text-light);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
      transition: all 0.2s;
    }
    .social-icon:hover {
      background: var(--primary);
      border-color: var(--primary);
      color: white;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 14px;
    }