/* roulang page: index */
:root {
      --primary-deep-green: #0A3D2E;
      --accent-cyan: #00C9A7;
      --bg-warm: #F7F5F2;
      --text-charcoal: #1E1E1E;
      --text-body: #3A3A3A;
      --text-muted: #6B6B6B;
      --border-light: #E8E5E0;
      --white: #FFFFFF;
      --warning-amber: #FF8C00;
      --danger-red: #E03A3A;
      --shadow-sm: 0 2px 12px rgba(10,61,46,0.06);
      --shadow-md: 0 8px 24px rgba(10,61,46,0.12);
      --radius-card: 12px;
      --radius-btn: 50px;
      --transition-base: 0.25s ease-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Noto Sans SC', sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    h1, h2 {
      font-weight: 700;
      color: var(--text-charcoal);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    button, input {
      font-family: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(247,245,242,0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
      height: 80px;
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      border-bottom: 1px solid var(--border-light);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep-green);
      letter-spacing: -0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .nav-menu a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-charcoal);
      transition: color 0.2s;
    }
    .nav-menu a:hover {
      color: var(--accent-cyan);
    }
    .nav-cta {
      background: var(--accent-cyan);
      color: var(--primary-deep-green) !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: background 0.2s, transform 0.2s;
    }
    .nav-cta:hover {
      background: #00B392;
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--primary-deep-green);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(0deg, rgba(10,61,46,0.7), rgba(10,61,46,0.75)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: 80px;
    }
    .hero-content {
      max-width: 700px;
      color: white;
    }
    .hero h1 {
      font-size: 56px;
      line-height: 1.1;
      font-weight: 700;
      letter-spacing: -1px;
      color: white;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 40px;
      max-width: 560px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep-green);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
      animation: pulse-glow 2s infinite;
    }
    .btn-primary:hover {
      background: #00B392;
      box-shadow: 0 6px 18px rgba(0,201,167,0.5);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary-deep-green);
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 0 0 rgba(0,201,167,0.5); }
      50% { box-shadow: 0 0 18px 4px rgba(0,201,167,0.3); }
      100% { box-shadow: 0 0 0 0 rgba(0,201,167,0.5); }
    }
    /* 区块通用 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-charcoal);
      margin-bottom: 16px;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: var(--primary-deep-green);
      margin-top: 12px;
    }
    .ghost-link {
      display: inline-block;
      margin-top: 30px;
      border: 2px solid var(--primary-deep-green);
      color: var(--primary-deep-green);
      padding: 10px 28px;
      border-radius: 50px;
      font-weight: 700;
      transition: 0.2s;
    }
    .ghost-link:hover {
      background: var(--primary-deep-green);
      color: white;
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .stat-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-number {
      font-family: 'JetBrains Mono', monospace;
      font-size: 28px;
      font-weight: 400;
      color: var(--primary-deep-green);
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    .trend-up { color: var(--accent-cyan); margin-left: 4px; }
    .trend-down { color: var(--danger-red); margin-left: 4px; }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }
    .service-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-deep-green);
      margin-bottom: 12px;
    }
    .service-desc {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    /* 对比区 */
    .comparison-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .table-sim {
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    .table-header {
      background: var(--primary-deep-green);
      color: white;
      padding: 14px 20px;
      font-weight: 700;
    }
    .table-row {
      display: flex;
      justify-content: space-between;
      padding: 14px 20px;
      background: var(--bg-warm);
    }
    .table-row:nth-child(even) { background: var(--white); }
    .bar-chart {
      display: flex;
      align-items: flex-end;
      justify-content: space-around;
      height: 220px;
      gap: 24px;
      padding: 0 10px;
    }
    .bar {
      width: 60px;
      border-radius: 8px 8px 0 0;
      background: var(--accent-cyan);
      position: relative;
      transition: height 0.3s;
    }
    .bar:nth-child(2) { background: var(--primary-deep-green); }
    .bar:nth-child(3) { background: var(--warning-amber); }
    .bar span {
      position: absolute;
      top: -24px;
      left: 0;
      right: 0;
      text-align: center;
      font-weight: 700;
      font-family: 'JetBrains Mono', monospace;
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--white);
      border-radius: 8px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 500;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: var(--white);
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-charcoal);
    }
    .faq-icon {
      color: var(--accent-cyan);
      font-weight: 700;
      font-size: 22px;
    }
    .faq-answer {
      padding: 0 28px 20px;
      color: #4A4A4A;
      font-size: 15px;
      line-height: 1.7;
      display: none;
    }
    .faq-item.active .faq-answer { display: block; }
    /* CTA区 */
    .cta-dark {
      background: var(--primary-deep-green);
      padding: 80px 0;
      text-align: center;
    }
    .cta-title {
      font-size: 40px;
      font-weight: 700;
      color: white;
      margin-bottom: 20px;
    }
    .cta-sub {
      color: rgba(255,255,255,0.8);
      font-size: 18px;
      margin-bottom: 40px;
    }
    .cta-form {
      display: flex;
      justify-content: center;
      gap: 8px;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 14px 24px;
      border-radius: 50px;
      border: none;
      width: 360px;
      max-width: 90vw;
      outline: none;
    }
    /* 页脚 */
    .site-footer {
      background: #1E1E1E;
      color: #A0A0A0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer a { color: #A0A0A0; transition: 0.2s; }
    .footer a:hover { color: var(--accent-cyan); }
    .footer-bottom {
      border-top: 1px solid #333;
      padding-top: 20px;
      font-size: 13px;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      section { padding: 80px 0; }
      .hero h1 { font-size: 36px; }
      .hero-sub { font-size: 16px; }
      .section-title { font-size: 28px; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        height: calc(100vh - 64px);
        background: var(--bg-warm);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 24px;
        font-size: 20px;
        z-index: 999;
      }
      .mobile-menu.open { display: flex; }
      .site-header { height: 64px; }
      .hero { padding-top: 64px; min-height: 90vh; }
      .services-grid, .dashboard-grid, .comparison-row, .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-form { flex-direction: column; align-items: center; }
      .cta-input { width: 100%; }
      .btn-primary, .btn-ghost { width: 100%; text-align: center; }
    }
    @media (max-width: 480px) {
      .container { padding: 0 16px; }
      .hero h1 { font-size: 28px; }
    }