/* roulang page: index */
:root {
      --primary: #6C1DDE;
      --secondary: #00E5CC;
      --accent: #FF3D6F;
      --bg-deep: #0B0C10;
      --bg-card: #14161F;
      --bg-light: #1A1C26;
      --text-white: #FFFFFF;
      --text-body: #B0B3C1;
      --text-muted: #6F7280;
      --border-subtle: rgba(255,255,255,0.06);
      --border-glow: rgba(0,229,204,0.3);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-glow: 0 0 20px rgba(0,229,204,0.3);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-data: 'DIN Alternate', 'PingFang SC', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--text-white);
    }
    h1 {
      font-size: 56px;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 20px;
      font-weight: 700;
    }
    a {
      color: var(--secondary);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: #fff;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .top-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11,12,16,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,229,204,0.15);
      z-index: 100;
      padding: 10px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 28px;
      font-weight: 800;
      color: var(--secondary);
      text-shadow: 0 0 12px rgba(0,229,204,0.5);
      letter-spacing: 1px;
      line-height: 1;
    }
    .nav-chips {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .nav-chips a {
      color: var(--text-muted);
      font-size: 15px;
      font-weight: 500;
      padding-bottom: 8px;
      border-bottom: 3px solid transparent;
      transition: all 0.25s;
      white-space: nowrap;
    }
    .nav-chips a:hover {
      color: #fff;
    }
    .nav-chips a.active {
      color: var(--secondary);
      border-bottom-color: var(--secondary);
    }
    .btn-primary {
      background: var(--secondary);
      color: #0B0C10;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      font-size: 14px;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: #00ffea;
      box-shadow: 0 0 18px rgba(0,229,204,0.6);
      color: #000;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      transition: all 0.25s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0,229,204,0.1);
      border-color: #00ffea;
      color: #00ffea;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      border: none;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-accent:hover {
      background: #e62e5c;
      transform: scale(1.03);
      box-shadow: 0 0 22px rgba(255,61,111,0.5);
      color: white;
    }
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--secondary);
      transition: 0.3s;
    }
    @media (max-width: 1024px) {
      .nav-chips {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #0B0C10;
        border-bottom: 1px solid var(--secondary);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
      }
      .mobile-menu.open {
        display: flex;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 30% 20%, rgba(108,29,222,0.25) 0%, transparent 60%);
      position: relative;
      overflow: hidden;
    }
    .hero .particles {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-right img {
      border-radius: 12px;
      box-shadow: 0 0 30px rgba(0,229,204,0.25);
    }
    .hero h1 {
      background: linear-gradient(135deg, #00E5CC 0%, #6C1DDE 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: #B0B3C1;
      margin-bottom: 32px;
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 30px;
    }
    .stats-bar {
      display: flex;
      gap: 30px;
      color: var(--text-body);
      font-size: 14px;
    }
    .stats-bar span {
      font-family: var(--font-data);
      color: var(--secondary);
      font-size: 28px;
      font-weight: 700;
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      margin-bottom: 48px;
    }
    .section-title h2 {
      position: relative;
      display: inline-block;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--secondary);
    }
    /* 核心优势 非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 30px;
    }
    .main-advantage {
      background: var(--bg-card);
      border-left: 4px solid var(--secondary);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: 0 0 12px rgba(0,229,204,0.1);
    }
    .sub-advantages {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .sub-card {
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--radius-md);
      display: flex;
      gap: 16px;
      align-items: flex-start;
      border: 1px solid var(--border-subtle);
      transition: 0.25s;
    }
    .sub-card:hover {
      box-shadow: var(--shadow-glow);
      border-color: rgba(0,229,204,0.3);
    }
    .sub-card i {
      font-size: 28px;
      color: var(--secondary);
    }
    /* 功能标签切换 */
    .tab-nav {
      display: flex;
      gap: 16px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .tab-btn {
      background: transparent;
      border: 1px solid var(--text-muted);
      color: var(--text-muted);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }
    .tab-btn.active {
      background: var(--secondary);
      color: #0B0C10;
      border-color: var(--secondary);
    }
    .tab-pane {
      display: none;
      animation: fade 0.3s;
    }
    .tab-pane.active {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    @keyframes fade { from {opacity:0;} to {opacity:1;} }
    /* 场景卡片 */
    .scene-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .scene-card {
      min-width: 280px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md);
      height: 220px;
      position: relative;
      overflow: hidden;
      scroll-snap-align: start;
    }
    .scene-card .overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 20px;
      background: linear-gradient(transparent, rgba(11,12,16,0.9));
      color: white;
    }
    /* 数据面板 */
    .data-panel {
      background: #14161F;
      border-radius: var(--radius-lg);
      padding: 48px;
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-number {
      font-family: var(--font-data);
      font-size: 48px;
      color: var(--secondary);
      font-weight: 700;
    }
    /* FAQ */
    .accordion-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      margin-bottom: 8px;
      border-radius: var(--radius-md);
    }
    .accordion-title {
      padding: 18px 24px;
      font-weight: 700;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      padding: 0 24px 18px;
      color: var(--text-body);
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A1C26 0%, #0B0C10 100%);
      position: relative;
      text-align: center;
      padding: 80px 20px;
    }
    .cta-banner::before {
      content: '';
      position: absolute;
      top:0;left:0;width:100%;height:4px;
      background: linear-gradient(90deg, var(--secondary), var(--primary));
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    .footer-bottom {
      text-align: center;
      padding: 20px 0;
      color: var(--text-muted);
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.04);
    }
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .advantages-grid { grid-template-columns: 1fr; }
      .data-panel { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      h1 { font-size: 32px; }
      .tab-pane.active { grid-template-columns: 1fr; }
      .data-panel { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .stats-bar { flex-direction: column; gap:12px; }
    }