/* roulang page: index */
:root {
      --primary-green: #0ABF53;
      --primary-dark: #089B45;
      --primary-light-bg: rgba(10, 191, 83, 0.08);
      --primary-glow: rgba(10, 191, 83, 0.3);
      --text-dark: #1A1E24;
      --text-secondary: #6B7280;
      --text-muted: #9CA3AF;
      --warning-orange: #F59E0B;
      --error-red: #EF4444;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --border-light: #E5E7EB;
      --border-input: #D1D5DB;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 6px 20px rgba(0,0,0,0.08), 0 12px 32px rgba(0,0,0,0.1);
      --radius-card: 16px;
      --radius-button: 50px;
      --radius-input: 12px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1200px;
      --section-gap: 100px;
      --section-gap-mobile: 64px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      background: none;
      outline: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航栏 - 桌面 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--card-white);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: box-shadow 0.2s;
    }

    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-green);
      letter-spacing: 1px;
    }

    .logo-domain {
      font-size: 12px;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.3px;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .desktop-nav a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary-green);
      border-radius: 3px;
      transition: width 0.25s ease;
    }

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--primary-green);
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: 0.2s;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: var(--card-white);
      box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
      z-index: 999;
      justify-content: space-around;
      align-items: center;
      padding: 0 8px;
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      font-size: 10px;
      color: var(--text-secondary);
      transition: 0.2s;
      font-weight: 500;
    }

    .mobile-nav-item i {
      font-size: 20px;
      color: inherit;
    }

    .mobile-nav-item.active {
      color: var(--primary-green);
      font-weight: 600;
    }

    /* 全屏抽屉导航 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--card-white);
      z-index: 2000;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }

    .mobile-drawer.open {
      opacity: 1;
      pointer-events: auto;
    }

    .mobile-drawer a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-dark);
    }

    .drawer-close {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--text-dark);
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.4s ease-out, transform 0.4s ease-out;
    }

    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      padding-bottom: 80px;
      background-color: var(--bg-light);
      display: flex;
      align-items: center;
      min-height: 80vh;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 400px;
    }

    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .hero-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .metrics-row {
      display: flex;
      gap: 20px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }

    .metric-card {
      background: var(--card-white);
      border-radius: 12px;
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      flex: 1 1 120px;
    }

    .metric-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-green);
      line-height: 1.2;
      font-variant-numeric: tabular-nums;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 4px;
    }

    .btn-primary {
      display: inline-block;
      background: var(--primary-green);
      color: white;
      font-weight: 600;
      padding: 14px 34px;
      border-radius: var(--radius-button);
      font-size: 16px;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 12px var(--primary-glow);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px var(--primary-glow);
    }

    .hero-visual {
      flex: 1 1 300px;
      display: flex;
      justify-content: center;
    }

    .hero-visual img {
      max-height: 320px;
      width: auto;
    }

    /* 服务卡片 */
    .section-title {
      font-size: 32px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 48px;
      text-align: center;
      color: var(--text-dark);
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light-bg);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }

    .card-icon svg {
      width: 28px;
      height: 28px;
      stroke: var(--primary-green);
      fill: none;
      stroke-width: 2;
    }

    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 16px;
      flex: 1;
    }

    .text-link {
      color: var(--primary-green);
      font-weight: 500;
      font-size: 14px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }

    .text-link:hover {
      gap: 8px;
    }

    /* 对比区 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .compare-card {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
    }

    .compare-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 15px;
    }

    .check-green {
      color: var(--primary-green);
      font-weight: 600;
    }

    .cross-gray {
      color: #ccc;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 16px;
      color: var(--text-dark);
      transition: color 0.2s;
    }

    .faq-question.active-question {
      color: var(--primary-green);
    }

    .faq-toggle {
      font-size: 18px;
      color: var(--primary-green);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-in-out;
      font-size: 15px;
      color: var(--text-secondary);
      padding-right: 20px;
    }

    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA 表单 */
    .cta-section {
      background: var(--bg-light);
    }

    .cta-card {
      background: var(--card-white);
      border-radius: 24px;
      padding: 48px;
      max-width: 680px;
      margin: 0 auto;
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .cta-card h2 {
      font-size: 28px;
      margin-bottom: 10px;
    }

    .cta-sub {
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .form-group {
      margin-bottom: 20px;
      text-align: left;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      font-size: 15px;
      background: white;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .form-group input:focus,
    .form-group textarea:focus {
      border-color: var(--primary-green);
      box-shadow: 0 0 0 3px var(--primary-glow);
    }

    .btn-full {
      width: 100%;
      padding: 14px;
      font-weight: 600;
    }

    /* Footer */
    .site-footer {
      background: #1A1E24;
      color: white;
      padding: 60px 0 20px;
    }

    .footer-links {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-weight: 600;
      margin-bottom: 16px;
      font-size: 14px;
      color: white;
    }

    .footer-col a {
      display: block;
      color: var(--text-muted);
      font-size: 14px;
      margin-bottom: 8px;
      transition: color 0.2s;
    }

    .footer-col a:hover {
      color: var(--primary-green);
    }

    .copyright {
      font-size: 12px;
      color: var(--text-muted);
      text-align: center;
      border-top: 1px solid #2d3239;
      padding-top: 20px;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero-grid { flex-direction: column; text-align: center; }
      .metrics-row { justify-content: center; }
    }

    @media (max-width: 640px) {
      .desktop-nav { display: none; }
      .hamburger { display: flex; }
      .mobile-bottom-nav { display: flex; }
      .site-header { height: 60px; }
      .hero { padding-top: 80px; }
      .hero-text h1 { font-size: 36px; }
      .section-title { font-size: 26px; }
      .cards-grid { grid-template-columns: 1fr; }
      .footer-links { grid-template-columns: 1fr 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .cta-card { padding: 32px 20px; }
      section { padding: var(--section-gap-mobile) 0; }
    }