/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --primary: #00F0A8;
      --danger: #FF3C5A;
      --card-bg: #141B26;
      --text-primary: #E8ECF1;
      --text-secondary: #6B7A8E;
      --border-light: #1E2633;
      --input-bg: #0D1117;
      --container-max: 1280px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-btn: 4px;
      --shadow-glow: 0 0 0 1px rgba(0,240,168,0.08);
      --shadow-hover: 0 0 0 1px rgba(0,240,168,0.4);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'Roboto', monospace;
      --transition: 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 图片基础 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-md);
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      cursor: pointer;
      text-decoration: none;
      font-size: 15px;
      padding: 14px 28px;
      border: 1px solid transparent;
      line-height: 1.2;
      white-space: nowrap;
      font-family: var(--font-sans);
    }
    
    .btn-primary {
      background: var(--primary);
      color: #0A0E17;
      border-color: var(--primary);
    }
    
    .btn-primary:hover {
      background: #1affb7;
      box-shadow: 0 0 16px rgba(0,240,168,0.3);
      transform: translateY(-1px);
    }
    
    .btn-outline {
      background: transparent;
      border: 1px solid var(--text-secondary);
      color: var(--text-primary);
    }
    
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0,240,168,0.05);
    }
    
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10,14,23,0.6);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(30,38,51,0.5);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    
    .site-header.scrolled {
      background: rgba(10,14,23,0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.3px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    
    .logo i {
      color: var(--primary);
      font-size: 24px;
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition);
      position: relative;
      padding-bottom: 4px;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 24px;
      cursor: pointer;
      transition: color 0.2s;
    }
    
    .menu-toggle:hover {
      color: var(--primary);
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: #0A0E17;
        flex-direction: column;
        padding: 24px;
        gap: 24px;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }
    
    /* 板块间距 */
    section {
      padding: 100px 0;
      position: relative;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    
    /* 标题层级 */
    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--text-primary);
    }
    
    h2 {
      font-size: 32px;
      font-weight: 600;
      letter-spacing: 0;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    
    h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-primary);
    }
    
    .section-desc {
      color: var(--text-secondary);
      font-size: 16px;
      max-width: 600px;
      margin-bottom: 40px;
    }
    
    /* 首屏 Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 60px;
      align-items: center;
      min-height: 85vh;
    }
    
    .hero-left {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    
    .hero-metrics {
      display: flex;
      gap: 28px;
      margin-top: 10px;
    }
    
    .metric-item {
      display: flex;
      flex-direction: column;
    }
    
    .metric-number {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      font-variant-numeric: tabular-nums;
    }
    
    .metric-label {
      font-size: 13px;
      color: var(--text-secondary);
    }
    
    .hero-right {
      background: rgba(20,27,38,0.6);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-light);
      position: relative;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(0,240,168,0.08);
    }
    
    .dashboard-mock {
      font-family: var(--font-mono);
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    
    .score-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: rgba(0,240,168,0.05);
      padding: 12px 16px;
      border-radius: 6px;
    }
    
    .team-name {
      font-weight: 500;
      color: var(--text-secondary);
    }
    
    .score-big {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      margin: 0 8px;
    }
    
    .blink-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
      animation: pulse 1.2s infinite;
    }
    
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.9); }
      100% { opacity: 1; transform: scale(1); }
    }
    
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 28px 24px;
      border: 1px solid transparent;
      box-shadow: var(--shadow-glow);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    
    .feature-card:hover {
      border-color: rgba(0,240,168,0.4);
      transform: translateY(-2px);
    }
    
    .feature-icon {
      font-size: 28px;
      color: var(--primary);
    }
    
    .feature-data {
      font-family: var(--font-mono);
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
    }
    
    /* 核心优势非对称布局 */
    .advantage-asym {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 30px;
    }
    
    .advantage-left {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    
    .advantage-left img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    
    .adv-text {
      padding: 24px;
    }
    
    .advantage-right {
      display: grid;
      grid-template-rows: 1fr 1fr;
      gap: 20px;
    }
    
    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 24px;
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    
    /* 瀑布流案例 */
    .waterfall {
      columns: 2;
      column-gap: 24px;
    }
    
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 24px;
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: all var(--transition);
    }
    
    .case-card:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    
    .case-card img {
      width: 100%;
      height: auto;
      transition: transform 0.3s ease;
    }
    
    .case-card:hover img {
      transform: scale(1.02);
    }
    
    .case-info {
      padding: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .case-score {
      font-family: var(--font-mono);
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
    }
    
    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--border-light);
    }
    
    .vs-badge {
      font-weight: 700;
      color: var(--danger);
      font-size: 18px;
    }
    
    .compare-col {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    
    .compare-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 0;
      border-bottom: 1px solid var(--border-light);
    }
    
    .check-green {
      color: var(--primary);
    }
    
    .cross-red {
      color: var(--danger);
    }
    
    /* FAQ */
    .faq-layout {
      display: grid;
      grid-template-columns: 200px 1fr;
      gap: 40px;
    }
    
    .faq-tabs {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    
    .faq-tab {
      background: transparent;
      border: none;
      color: var(--text-secondary);
      padding: 10px 16px;
      text-align: left;
      border-radius: 6px;
      cursor: pointer;
      transition: 0.2s;
      font-weight: 500;
    }
    
    .faq-tab.active {
      background: rgba(0,240,168,0.1);
      color: var(--primary);
    }
    
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    
    .accordion-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      margin-top: 8px;
    }
    
    /* CTA 表单 */
    .cta-section {
      background: #0A0E17;
      position: relative;
    }
    
    .particles-bg {
      position: absolute;
      inset: 0;
      overflow: hidden;
      pointer-events: none;
    }
    
    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 520px;
      margin: 28px auto 0;
    }
    
    .cta-input {
      flex: 1;
      background: var(--input-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      padding: 14px 18px;
      color: white;
      font-size: 15px;
      outline: none;
      transition: 0.2s;
    }
    
    .cta-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 10px rgba(0,240,168,0.3);
    }
    
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 40px;
    }
    
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding-top: 24px;
      text-align: center;
      color: var(--text-secondary);
      font-size: 14px;
    }
    
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .advantage-asym { grid-template-columns: 1fr; }
      .waterfall { columns: 2; }
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      .features-grid { grid-template-columns: 1fr; }
      .waterfall { columns: 1; }
      .compare-table { grid-template-columns: 1fr; }
      .faq-layout { grid-template-columns: 1fr; }
      .faq-tabs { flex-direction: row; overflow-x: auto; }
      .cta-form { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }