/* roulang page: index */
:root {
      --primary: #0F2B46;
      --primary-light: #1a3f5e;
      --accent-gold: #D4AF37;
      --accent-gold-hover: #b8942c;
      --accent-coral: #E85D3F;
      --bg-light: #F8F9FA;
      --bg-white: #FFFFFF;
      --text-body: #4A5568;
      --text-muted: #718096;
      --text-heading: #0F2B46;
      --border-light: #E2E8F0;
      --border-input: #CBD5E0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-search: 24px;
      --shadow-card: 0 4px 12px rgba(15,43,70,0.06);
      --shadow-card-hover: 0 14px 28px rgba(15,43,70,0.12);
      --shadow-nav: 0 2px 8px rgba(0,0,0,0.06);
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 5rem;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 700;
      margin-top: 0;
      line-height: 1.3;
    }

    h1 {
      font-size: 3.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 1.25rem;
    }

    h2 {
      font-size: 2.4rem;
      margin-bottom: 2rem;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--accent-gold);
      border-radius: 2px;
    }

    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }

    .text-muted {
      color: var(--text-muted);
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    a:hover {
      color: var(--accent-gold);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .section {
      padding: var(--spacing-section) 0;
    }

    @media (max-width: 1024px) {
      h1 {
        font-size: 3rem;
      }
      h2 {
        font-size: 2rem;
      }
      .section {
        padding: 4rem 0;
      }
    }

    @media (max-width: 640px) {
      h1 {
        font-size: 2.4rem;
      }
      h2 {
        font-size: 1.8rem;
      }
      .section {
        padding: 2.8rem 0;
      }
    }

    /* 导航栏 */
    .site-nav {
      background: #fff;
      box-shadow: var(--shadow-nav);
      position: sticky;
      top: 0;
      z-index: 40;
      padding: 0.8rem 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.3px;
    }

    .logo i {
      font-size: 2rem;
      color: var(--accent-gold);
    }

    .search-wrapper {
      flex: 1;
      max-width: 450px;
      margin: 0 2rem;
      position: relative;
    }

    .search-input-group {
      display: flex;
      align-items: center;
      background: #F1F3F5;
      border-radius: var(--radius-search);
      padding: 0.4rem 1.2rem;
      border: 1px solid transparent;
      transition: all 0.2s;
    }

    .search-input-group:focus-within {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(15,43,70,0.1);
    }

    .search-input-group i {
      color: var(--text-muted);
      font-size: 1rem;
    }

    .search-input-group input {
      border: none;
      background: transparent;
      padding: 0.6rem 0.8rem;
      width: 100%;
      outline: none;
      font-size: 0.95rem;
      color: var(--text-heading);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      font-weight: 500;
    }

    .nav-links a {
      color: var(--text-heading);
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a:hover {
      color: var(--accent-gold);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.2s;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .mobile-menu-icon {
      display: none;
      font-size: 1.8rem;
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .search-wrapper {
        max-width: 300px;
        margin: 0 1rem;
      }
      .nav-links {
        gap: 1.2rem;
        font-size: 0.9rem;
      }
    }

    @media (max-width: 768px) {
      .nav-container {
        flex-wrap: wrap;
      }
      .mobile-menu-icon {
        display: block;
      }
      .nav-links, .search-wrapper {
        display: none;
        width: 100%;
      }
      .nav-links.active, .search-wrapper.active {
        display: flex;
        flex-direction: column;
        margin: 1rem 0 0;
      }
      .search-wrapper.active {
        margin-bottom: 1rem;
      }
      .search-wrapper {
        max-width: 100%;
        margin: 0;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(15,43,70,0.82) 0%, rgba(10,25,45,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: #fff;
      padding: 7rem 0 6rem;
      display: flex;
      align-items: center;
      position: relative;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      color: #fff;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    .hero-subtitle {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 2rem;
      max-width: 550px;
    }

    .btn-gold {
      background: var(--accent-gold);
      color: #0F2B46;
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: all 0.2s;
      border: none;
      font-size: 1.1rem;
    }

    .btn-gold:hover {
      background: var(--accent-gold-hover);
      color: #fff;
      box-shadow: 0 8px 18px rgba(212,175,55,0.4);
    }

    .hero-image {
      flex: 0.8;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.3);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-image {
        margin-top: 2rem;
        max-width: 320px;
      }
      .hero-text h1 {
        font-size: 2.5rem;
      }
    }

    /* 指标看板 */
    .dashboard-grid {
      display: flex;
      gap: 1.8rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .stat-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      text-align: center;
      min-width: 200px;
      flex: 1;
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .stat-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.4rem;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin-top: 0.5rem;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .service-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    .service-img {
      height: 180px;
      overflow: hidden;
    }

    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .service-card:hover .service-img img {
      transform: scale(1.04);
    }

    .service-body {
      padding: 1.8rem;
    }

    .service-body h3 {
      margin-bottom: 0.5rem;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比区 */
    .comparison-wrapper {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .vs-badge {
      background: var(--accent-gold);
      color: #0F2B46;
      font-weight: 800;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    .compare-col {
      flex: 1;
      background: #fff;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
    }

    .bar-chart {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }

    .bar-item {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .bar-label {
      width: 90px;
      font-weight: 600;
      color: var(--text-heading);
    }

    .bar-bg {
      flex: 1;
      height: 24px;
      background: #EDF2F7;
      border-radius: 12px;
      overflow: hidden;
    }

    .bar-fill {
      height: 100%;
      border-radius: 12px;
      width: 0%;
      transition: width 0.8s;
    }

    .bar-fill.old {
      background: #A0AEC0;
    }
    .bar-fill.new {
      background: var(--accent-coral);
    }

    @media (max-width: 768px) {
      .comparison-wrapper {
        flex-direction: column;
      }
    }

    /* FAQ */
    .accordion-item {
      background: #fff;
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-title {
      font-weight: 700;
      padding: 1.2rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-heading);
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F8F9FA;
      padding: 0 1.2rem;
    }

    .accordion-content p {
      padding: 1rem 0;
    }

    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: start;
    }

    .form-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 2.5rem;
      box-shadow: 0 12px 30px rgba(0,0,0,0.08);
    }

    .input-style {
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      padding: 0.8rem;
      width: 100%;
      margin-bottom: 1.2rem;
      transition: 0.2s;
      font-size: 1rem;
    }

    .input-style:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15,43,70,0.15);
      outline: none;
    }

    .footer-dark {
      background: #0F2B46;
      color: #CBD5E0;
      padding: 3.5rem 0 2rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

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

    .social-icon {
      display: inline-flex;
      width: 36px;
      height: 36px;
      border: 1px solid #CBD5E0;
      border-radius: 50%;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
      color: #CBD5E0;
    }

    .social-icon:hover {
      background: var(--accent-gold);
      border-color: var(--accent-gold);
      color: #0F2B46;
    }