/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-dark: #0856CC;
      --primary-light: #E8F2FF;
      --accent: #F5A623;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text: #1A1A2E;
      --text-secondary: #5A6D80;
      --text-muted: #7B8D9E;
      --border: #E8ECF1;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --radius: 12px;
      --radius-sm: 8px;
      --transition: 0.25s ease;
      --max-width: 1200px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 22px;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
    }

    h1, h2, h3 {
      line-height: 1.3;
    }

    h1 {
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 28px;
      font-weight: 600;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .section {
      padding: 80px 0;
    }

    .section-label {
      display: inline-block;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 16px;
      letter-spacing: 0.3px;
    }

    /* Header */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.04);
      padding: 16px 0;
      transition: var(--transition);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 22px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-tag {
      background: var(--accent);
      color: #fff;
      font-size: 10px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 20px;
      letter-spacing: 0.5px;
    }

    .nav-list {
      display: flex;
      list-style: none;
      gap: 32px;
    }

    .nav-link {
      color: var(--text-secondary);
      font-size: 15px;
      font-weight: 500;
      padding: 6px 0;
      transition: var(--transition);
      position: relative;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }

    .nav-link:hover,
    .nav-link:focus {
      color: var(--primary);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 28px;
    }

    .menu-bar {
      height: 2px;
      background: var(--text);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: #fff;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.3s ease;
        z-index: 200;
      }

      .nav.active {
        right: 0;
      }

      .nav-list {
        flex-direction: column;
        gap: 28px;
      }

      .nav-link {
        font-size: 20px;
      }

      .menu-toggle {
        display: flex;
        z-index: 300;
      }

      .menu-toggle.active .bar1 {
        transform: rotate(45deg) translate(5px, 5px);
      }

      .menu-toggle.active .bar2 {
        opacity: 0;
      }

      .menu-toggle.active .bar3 {
        transform: rotate(-45deg) translate(5px, -5px);
      }
    }

    /* Hero */
    #hero {
      background: linear-gradient(180deg, #FFFFFF 0%, #F0F5FF 100%);
      padding: 60px 0 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-content {
      flex: 1;
    }

    .hero-img {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 380px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .hero-img::after {
      content: '';
      position: absolute;
      top: 16px;
      right: 16px;
      width: 140px;
      height: 280px;
      background: rgba(255,255,255,0.25);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,0.5);
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin: 16px 0 28px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

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

      h1 {
        font-size: 28px;
      }

      .hero-img {
        width: 100%;
        min-height: 260px;
      }
    }

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

    .metric-card {
      background: var(--white);
      border-radius: var(--radius);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

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

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

    .service-card {
      background: var(--white);
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .service-icon {
      width: 52px;
      height: 52px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      transition: transform 0.3s ease;
    }

    .service-card:hover .service-icon {
      transform: scale(1.1);
    }

    .service-title {
      margin-bottom: 10px;
    }

    .service-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    .service-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
    }

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

    /* Compare */
    #compare .compare-table {
      display: flex;
      gap: 2px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .compare-col {
      flex: 1;
      min-width: 260px;
      background: var(--white);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .compare-col.new {
      border-top: 4px solid var(--primary);
    }

    .compare-col.old {
      opacity: 0.8;
    }

    .compare-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px solid var(--border);
      font-size: 15px;
    }

    .check {
      color: #10B981;
      font-weight: 700;
    }

    .cross {
      color: #EF4444;
      font-weight: 700;
    }

    .compare-note {
      text-align: center;
      margin-top: 16px;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      font-weight: 500;
      font-size: 18px;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      position: relative;
    }

    .faq-indicator {
      width: 4px;
      height: 24px;
      background: var(--primary);
      border-radius: 2px;
    }

    .faq-answer {
      padding: 0 22px 18px 38px;
      font-size: 15px;
      color: var(--text-secondary);
      display: none;
    }

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

    .faq-item.open {
      background: #F9FBFD;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #0A6EFF 0%, #074DB3 100%);
      color: #fff;
      text-align: center;
      padding: 80px 22px;
    }

    .cta-title {
      font-size: 32px;
      font-weight: 700;
    }

    .cta-sub {
      margin: 16px 0 32px;
      opacity: 0.9;
    }

    .btn-white {
      background: #fff;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }

    .btn-trans {
      background: transparent;
      color: #fff;
      border: 1.5px solid rgba(255,255,255,0.9);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }

    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 28px;
      margin-top: 28px;
      font-size: 13px;
      opacity: 0.8;
    }

    /* Footer */
    .footer {
      background: #1A1A2E;
      color: #B0C4DE;
      padding: 56px 0 32px;
    }

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

    .footer-logo {
      color: #fff;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .footer-desc {
      font-size: 14px;
      line-height: 1.6;
    }

    .footer-title {
      color: #fff;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .footer-links {
      list-style: none;
      font-size: 14px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 36px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
    }

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

    .cover-img {
      border-radius: var(--radius);
      margin: 16px 0;
    }