/* roulang page: index */
:root {
      --primary-deep: #0B3D2E;
      --accent-lime: #C8FF00;
      --bg-warm: #F7F5F0;
      --text-dark: #1A1A1A;
      --text-secondary: #5C5C5C;
      --white: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 28px rgba(0,0,0,0.08);
      --border-light: rgba(0,0,0,0.06);
      --radius-card: 16px;
      --radius-btn: 40px;
      --radius-sm: 12px;
      --transition: 0.3s cubic-bezier(0.25,0.8,0.25,1.2);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-mono: 'Inter', 'SF Mono', monospace;
      --safe-bottom: env(safe-area-inset-bottom, 16px);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 PC */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(8px);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-lime);
      border-radius: 50%;
      margin-left: 6px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-secondary);
      padding-bottom: 4px;
      border-bottom: 3px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-link.active {
      color: var(--primary-deep);
      border-bottom-color: var(--accent-lime);
    }
    .nav-cta {
      background: var(--primary-deep);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .nav-cta:hover {
      background: #072E22;
      transform: translateX(3px);
    }
    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: white;
      border-radius: 28px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
      padding: 8px 12px;
      z-index: 110;
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.92);
    }
    .mobile-nav-items {
      display: flex;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      font-size: 12px;
      color: var(--text-secondary);
      padding: 8px 12px;
      border-radius: 20px;
      transition: 0.2s;
    }
    .mobile-nav-item.active {
      background: var(--accent-lime);
      color: var(--primary-deep);
      font-weight: 600;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg-warm);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.1;
      color: var(--primary-deep);
      margin-bottom: 16px;
      letter-spacing: -1px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-deep);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #072E22;
      transform: translateX(3px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(11,61,46,0.05);
    }
    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .metric-cards {
      position: relative;
      width: 100%;
      max-width: 380px;
    }
    .metric-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--card-shadow);
      margin-bottom: -20px;
      position: relative;
      z-index: 1;
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .metric-card:nth-child(1) { z-index: 3; transform: rotate(-1deg); }
    .metric-card:nth-child(2) { z-index: 2; transform: rotate(0.5deg); margin-top: -30px; }
    .metric-card:nth-child(3) { z-index: 1; transform: rotate(-0.8deg); margin-top: -30px; }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-lime);
      text-shadow: 0 0 8px rgba(200,255,0,0.3);
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-secondary);
    }
    .hero-bg-shape {
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: var(--primary-deep);
      opacity: 0.08;
      clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
      z-index: 0;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 600;
      margin-bottom: 48px;
      color: var(--primary-deep);
    }
    /* 优势 2x2 非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 24px;
    }
    .adv-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .adv-card.large {
      grid-row: span 1;
    }
    .adv-icon {
      font-size: 28px;
      color: var(--accent-lime);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .adv-desc {
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 实时数据看板 */
    .live-stats {
      background: var(--primary-deep);
      color: white;
      border-radius: 32px;
      padding: 64px 32px;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 64px;
      flex-wrap: wrap;
    }
    .stat-item .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-lime);
    }
    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
    }
    .compare-card.dark {
      background: #f2f0eb;
      border: 1px solid #ddd;
    }
    .compare-card.highlight {
      border: 2px solid var(--primary-deep);
      background: white;
    }
    .compare-list {
      list-style: none;
      margin-top: 20px;
    }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: #FAF9F7;
      border-radius: var(--radius-sm);
      padding: 20px;
      cursor: pointer;
      border-left: 4px solid var(--accent-lime);
      transition: 0.2s;
    }
    .faq-item.active {
      border-left-color: var(--primary-deep);
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: var(--primary-deep);
      color: white;
      border-radius: 32px;
      padding: 64px 32px;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      margin-top: 24px;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 14px 24px;
      border-radius: 40px;
      border: none;
      min-width: 260px;
    }
    .btn-lime {
      background: var(--accent-lime);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 40px;
      border: none;
      cursor: pointer;
    }
    footer {
      padding: 40px 0;
      text-align: center;
      color: var(--text-secondary);
      font-size: 14px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav { display: block; }
      .hero { padding: 100px 0 60px; }
      h1 { font-size: 36px !important; }
      .section-title { font-size: 28px; }
      .compare-grid, .faq-grid { grid-template-columns: 1fr; }
      .stats-grid { gap: 24px; }
    }