/* roulang page: index */
:root {
      --primary-deep: #0D4F4B;
      --primary-main: #1A7A6F;
      --primary-light: #2A9D8F;
      --accent-amber: #D49B3B;
      --accent-amber-light: #E9B856;
      --bg-warm: #F7F5F2;
      --card-white: #FFFFFF;
      --text-dark: #2C2C2C;
      --text-secondary: #6B6B6B;
      --border-light: rgba(0, 0, 0, 0.06);
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
      --shadow-nav: 0 2px 16px rgba(0, 0, 0, 0.04);
      --radius-card: 20px;
      --radius-btn: 50px;
      --font-zh: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-base: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-zh);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: var(--font-zh);
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏玻璃效果 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      background: rgba(255, 255, 255, 0.72);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-nav);
      transition: background var(--transition-base), box-shadow var(--transition-base);
      padding: 12px 0;
    }

    .navbar-custom.scrolled {
      background: rgba(255, 255, 255, 0.96);
      box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      color: var(--primary-main);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      font-size: 15px;
      transition: color var(--transition-base);
      padding: 4px 0;
    }

    .nav-links a:hover {
      color: var(--primary-main);
    }

    .btn-cta-nav {
      background: var(--accent-amber);
      border: none;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: all var(--transition-base);
      box-shadow: 0 4px 12px rgba(212, 155, 59, 0.25);
      white-space: nowrap;
    }

    .btn-cta-nav:hover {
      background: var(--accent-amber-light);
      transform: scale(1.03);
      color: white;
      box-shadow: 0 6px 18px rgba(212, 155, 59, 0.35);
    }

    .hamburger-menu {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
    }

    @media (max-width: 992px) {
      .nav-links {
        display: none;
      }
      .hamburger-menu {
        display: block;
      }
    }

    .mobile-nav-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      z-index: 2000;
      display: none;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 28px;
    }

    .mobile-nav-panel.active {
      display: flex;
    }

    .mobile-nav-panel a {
      font-size: 20px;
      font-weight: 500;
      color: var(--text-dark);
    }

    .mobile-nav-panel .btn-cta-nav {
      margin-top: 16px;
    }

    /* Hero 区域 */
    .hero-section {
      padding: 160px 0 120px;
      background: linear-gradient(135deg, rgba(13, 79, 75, 0.04) 0%, rgba(26, 122, 111, 0.08) 100%);
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }

    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1;
      max-width: 580px;
    }

    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--text-dark);
    }

    .hero-left .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.6;
    }

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

    .btn-primary-gradient {
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-main));
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition-base);
      box-shadow: 0 8px 20px rgba(13, 79, 75, 0.2);
    }

    .btn-primary-gradient:hover {
      background: linear-gradient(135deg, #0A3D39, #136B61);
      transform: scale(1.03);
      color: white;
      box-shadow: 0 12px 28px rgba(13, 79, 75, 0.3);
    }

    .btn-outline-primary {
      border: 2px solid var(--primary-main);
      color: var(--primary-main);
      background: transparent;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition-base);
    }

    .btn-outline-primary:hover {
      background: rgba(26, 122, 111, 0.08);
      border-color: var(--primary-deep);
      color: var(--primary-deep);
    }

    .hero-right {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: flex-end;
      min-height: 380px;
    }

    .data-card-stack {
      position: relative;
      width: 340px;
      height: 340px;
    }

    .float-card {
      background: var(--card-white);
      border-radius: 16px;
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
      position: absolute;
      display: flex;
      align-items: center;
      gap: 16px;
      width: 260px;
      transition: transform var(--transition-base);
    }

    .float-card.card-1 {
      top: 20px;
      left: 0;
    }

    .float-card.card-2 {
      top: 130px;
      left: 60px;
      z-index: 2;
    }

    .float-card.card-3 {
      top: 240px;
      left: -10px;
    }

    .badge-circle {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-light));
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      font-weight: 700;
      font-family: var(--font-number);
      flex-shrink: 0;
    }

    .card-label {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
    }

    @media (max-width: 992px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-right {
        margin-top: 48px;
        justify-content: center;
      }
      .hero-left h1 {
        font-size: 40px;
      }
      .data-card-stack {
        width: 280px;
        height: auto;
        position: static;
        display: flex;
        flex-direction: column;
        gap: 16px;
      }
      .float-card {
        position: static;
        width: 100%;
      }
    }

    /* 通用区块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* 指标看板 */
    .metrics-section {
      padding: 100px 0;
      background: var(--bg-warm);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
    }

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

    .metric-number {
      font-size: 40px;
      font-weight: 700;
      font-family: var(--font-number);
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-main));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }

    .metric-label {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 8px;
    }

    .trend-icon {
      font-size: 18px;
      color: var(--accent-amber);
    }

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

    /* 服务矩阵 */
    .services-section {
      padding: 100px 0;
      background: var(--card-white);
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      text-align: left;
    }

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

    .service-img {
      width: 100%;
      height: 160px;
      border-radius: 16px;
      background: #E8E6E1;
      margin-bottom: 20px;
      overflow: hidden;
      position: relative;
    }

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

    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 16px;
    }

    .text-link {
      color: var(--primary-main);
      font-weight: 600;
      font-size: 15px;
      transition: color var(--transition-base);
    }

    .text-link i {
      margin-left: 4px;
    }

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

    @media (max-width: 992px) {
      .services-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 576px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比区域 */
    .comparison-section {
      padding: 100px 0;
      background: var(--bg-warm);
    }

    .comparison-wrapper {
      display: flex;
      align-items: center;
      gap: 32px;
      justify-content: center;
    }

    .compare-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 36px;
      flex: 1;
      box-shadow: var(--shadow-card);
    }

    .compare-card.traditional {
      border: 1px solid #E0DCD5;
    }

    .compare-card.pa-mode {
      border: 2px solid var(--primary-main);
      background: linear-gradient(white, rgba(26, 122, 111, 0.02));
    }

    .compare-card h4 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 24px;
    }

    .compare-list {
      list-style: none;
      padding: 0;
    }

    .compare-list li {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid #f0f0f0;
      font-size: 16px;
    }

    .pa-mode .value {
      color: var(--primary-main);
      font-weight: 700;
    }

    .vs-badge {
      width: 48px;
      height: 48px;
      background: var(--accent-amber);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(212, 155, 59, 0.3);
      flex-shrink: 0;
    }

    @media (max-width: 768px) {
      .comparison-wrapper {
        flex-direction: column;
      }
      .vs-badge {
        margin: 16px 0;
      }
    }

    /* FAQ */
    .faq-section {
      padding: 100px 0;
      background: #F9F8F6;
    }

    .accordion-custom .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 12px;
    }

    .accordion-custom .accordion-header button {
      background: white;
      border-radius: 12px !important;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      font-weight: 600;
      padding: 18px 24px;
      color: var(--text-dark);
      border: none;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      background: #F9F8F6;
      color: var(--primary-deep);
    }

    .accordion-custom .accordion-body {
      padding: 0 24px 18px 60px;
      color: var(--text-secondary);
    }

    /* CTA 区域 */
    .cta-section {
      padding: 100px 0;
      background: linear-gradient(135deg, rgba(13, 79, 75, 0.05), rgba(26, 122, 111, 0.02));
    }

    .cta-form input {
      border: 1px solid #E0DCD5;
      border-radius: 12px;
      padding: 14px 18px;
      width: 100%;
      margin-bottom: 12px;
      transition: 0.2s;
    }

    .cta-form input:focus {
      border-color: var(--primary-main);
      box-shadow: 0 0 0 3px rgba(26,122,111,0.15);
      outline: none;
    }

    .btn-submit {
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-main));
      border: none;
      color: white;
      font-weight: 600;
      height: 52px;
      border-radius: 12px;
      width: 100%;
      transition: all var(--transition-base);
    }

    .btn-submit:hover {
      background: linear-gradient(135deg, #0A3D39, #136B61);
    }

    /* Footer */
    .footer-section {
      background: #1E1E1E;
      color: #CCCCCC;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
    }

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