/* roulang page: index */
:root {
      --royal-blue: #0A2E5C;
      --champagne-gold: #D4AF37;
      --deep-blue: #061F3E;
      --white: #FFFFFF;
      --soft-gray-blue: #F4F7FA;
      --text-dark: #1A202C;
      --text-body: #4A5568;
      --text-light: #CBD5E0;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 20px rgba(10, 46, 92, 0.06);
      --shadow-card-hover: 0 12px 32px rgba(10, 46, 92, 0.12);
      --radius-md: 12px;
      --radius-pill: 50px;
      --radius-tab: 30px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --transition-base: 0.2s ease-in-out;
      --max-width: 1280px;
      --space-section: 100px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.6;
      color: var(--text-body);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      line-height: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background-color: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
      border-bottom: 1px solid var(--soft-gray-blue);
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--royal-blue);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--champagne-gold);
    }

    .header-cta {
      background-color: var(--champagne-gold);
      color: var(--royal-blue);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-size: 0.95rem;
      transition: background-color 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .header-cta:hover {
      background-color: #E5C65C;
      box-shadow: 0 4px 14px rgba(212, 175, 55, 0.35);
    }

    .channel-row {
      display: flex;
      align-items: center;
      height: 48px;
      overflow-x: auto;
      gap: 8px;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
    }
    .channel-row::-webkit-scrollbar {
      display: none;
    }

    .nav-pill {
      display: inline-block;
      padding: 8px 20px;
      border-radius: var(--radius-tab);
      font-weight: 500;
      color: var(--text-body);
      background: transparent;
      transition: all var(--transition-base);
      font-size: 0.95rem;
      border-bottom: 3px solid transparent;
    }
    .nav-pill:hover {
      background-color: var(--soft-gray-blue);
      color: var(--royal-blue);
    }
    .nav-pill.active {
      color: var(--royal-blue);
      font-weight: 600;
      border-bottom-color: var(--champagne-gold);
      background-color: transparent;
    }

    /* 汉堡菜单 (移动端) */
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--royal-blue);
      cursor: pointer;
      line-height: 1;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(90deg, rgba(10,46,92,0.82) 0%, rgba(6,31,62,0.6) 60%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      position: relative;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-right {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      border-radius: 28px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.4);
      max-height: 420px;
      object-fit: cover;
      width: 100%;
    }
    .hero h1 {
      font-size: clamp(36px, 5vw, 48px);
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: white;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    .hero-sub {
      font-size: 1.2rem;
      margin-bottom: 32px;
      opacity: 0.9;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .btn-primary {
      background: var(--champagne-gold);
      color: var(--royal-blue);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      border: none;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 1rem;
      display: inline-block;
      box-shadow: 0 6px 18px rgba(212,175,55,0.3);
    }
    .btn-primary:hover {
      background: #E5C65C;
      box-shadow: 0 10px 24px rgba(212,175,55,0.5);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-pill);
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--royal-blue);
    }
    .trust-text {
      margin-top: 16px;
      font-size: 0.9rem;
      color: rgba(255,255,255,0.8);
    }

    /* 板块通用 */
    .section {
      padding: var(--space-section) 0;
    }
    .section-alt {
      background-color: var(--soft-gray-blue);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--royal-blue);
      margin-bottom: 12px;
    }
    .section-sub {
      color: var(--text-body);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 核心服务 - 左图右文 */
    .service-layout {
      display: flex;
      gap: 48px;
      align-items: center;
    }
    .service-img {
      flex: 1 1 45%;
    }
    .service-img img {
      border-radius: 24px;
      box-shadow: var(--shadow-card);
    }
    .service-list {
      flex: 1 1 50%;
    }
    .service-item {
      display: flex;
      gap: 20px;
      margin-bottom: 36px;
      position: relative;
    }
    .service-num {
      font-size: 4rem;
      font-weight: 800;
      color: rgba(10,46,92,0.08);
      line-height: 1;
      position: absolute;
      left: -20px;
      top: -10px;
      user-select: none;
    }
    .service-text {
      border-left: 4px solid var(--champagne-gold);
      padding-left: 24px;
    }
    .service-text h3 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--royal-blue);
    }

    /* 品牌实力数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--champagne-gold);
    }
    .stat-label {
      color: var(--royal-blue);
      font-weight: 500;
    }

    /* 案例 2x2 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover img {
      transform: scale(1.04);
    }
    .case-info {
      padding: 24px;
    }
    .case-info h3 {
      font-weight: 700;
      color: var(--royal-blue);
      margin-bottom: 8px;
    }
    .text-link {
      color: var(--champagne-gold);
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
      border-bottom: 1px solid transparent;
    }
    .text-link:hover {
      border-bottom-color: var(--champagne-gold);
    }

    /* 时间线方案 */
    .timeline {
      position: relative;
      padding-left: 40px;
    }
    .timeline::before {
      content: '';
      position: absolute;
      left: 20px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: var(--champagne-gold);
    }
    .timeline-step {
      margin-bottom: 40px;
      position: relative;
    }
    .timeline-step::before {
      content: attr(data-step);
      position: absolute;
      left: -44px;
      background: var(--royal-blue);
      color: white;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      border: 3px solid var(--champagne-gold);
    }
    .timeline-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      margin-left: 20px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--royal-blue);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      font-size: 1.8rem;
      font-weight: 300;
      color: var(--champagne-gold);
    }

    /* CTA 尾屏 */
    .cta-dark {
      background: var(--deep-blue);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      margin-top: 32px;
    }
    .cta-form input {
      padding: 14px 20px;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      background: white;
      min-width: 220px;
      outline: none;
    }
    .cta-form input:focus {
      border-color: var(--royal-blue);
      box-shadow: 0 0 0 3px rgba(10,46,92,0.1);
    }
    .btn-gold {
      background: var(--champagne-gold);
      color: var(--royal-blue);
      font-weight: 700;
      padding: 14px 32px;
      border: none;
      border-radius: var(--radius-pill);
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-gold:hover {
      background: #E5C65C;
    }

    /* 页脚 */
    .footer {
      background: #061F3E;
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--champagne-gold);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .service-layout {
        flex-direction: column;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      :root {
        --space-section: 60px;
      }
      .channel-row {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        box-shadow: 0 12px 24px rgba(0,0,0,0.1);
        padding: 16px;
      }
      .channel-row.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero {
        min-height: 70vh;
        text-align: center;
      }
      .hero-right {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }