/* roulang page: index */
:root {
      --primary: #A855F7;
      --primary-dark: #9333EA;
      --accent: #00F0FF;
      --gold: #FFD700;
      --bg-dark: #0A0A0F;
      --bg-panel: #12121A;
      --bg-card: #1A1A24;
      --border-dim: #2A2A3A;
      --text-primary: #FFFFFF;
      --text-secondary: #CCCCCC;
      --text-muted: #888888;
      --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 12px rgba(168,85,247,0.6);
      --transition-fast: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-dark);
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10,10,15,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(10,10,15,0.85), rgba(10,10,15,0.85)), linear-gradient(90deg, transparent, var(--primary), transparent);
      background-origin: border-box;
      background-clip: padding-box, border-box;
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition-fast);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 16px;
      font-weight: 500;
      position: relative;
      padding-bottom: 6px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      font-weight: 600;
      font-size: 15px;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 15px rgba(168,85,247,0.7);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10,10,15,0.96);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      font-size: 22px;
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
    }
    .mobile-menu .btn-nav {
      margin-top: 20px;
      font-size: 18px;
      padding: 14px 40px;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 20px rgba(168,85,247,0.8);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }
    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(10,10,15,0.75);
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(168,85,247,0.15), transparent 70%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      background: linear-gradient(to right, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero-subtitle {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 40px;
      color: var(--accent);
      font-family: var(--font-mono);
      font-size: 18px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .hero h1 { font-size: 36px; }
      .hero-stats { flex-direction: column; gap: 12px; }
      .hero-buttons .btn-primary, .hero-buttons .btn-outline { width: 100%; text-align: center; }
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-dim);
      transition: all 0.25s ease;
    }
    .feature-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
    }
    .feature-large {
      background: linear-gradient(145deg, #1E1A2B, #0F0D1A);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .big-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .features-grid { grid-template-columns: 1fr; }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      border: 1px solid var(--border-dim);
      transition: 0.25s;
      text-align: center;
    }
    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
    }
    .service-icon {
      font-size: 40px;
      margin-bottom: 16px;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .services-grid { grid-template-columns: 1fr; }
    }
    /* 数据看板 */
    .data-panel {
      background: var(--bg-panel);
      border-radius: var(--radius-card);
      padding: 48px 32px;
    }
    .data-cards {
      display: flex;
      gap: 32px;
      overflow-x: auto;
      padding-bottom: 12px;
    }
    .data-item {
      flex: 1;
      min-width: 180px;
      text-align: center;
    }
    .data-value {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    /* 对比 */
    .compare-row {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .compare-card {
      flex: 1;
      background: #1E1E28;
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-card.better {
      background: #1A1A24;
      border: 1px solid var(--primary);
      color: white;
    }
    .divider-line {
      width: 2px;
      height: 120px;
      background: linear-gradient(to bottom, transparent, var(--primary), transparent);
    }
    @media (max-width: 768px) {
      .compare-row { flex-direction: column; }
      .divider-line { width: 100%; height: 2px; }
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      border-left: 4px solid var(--primary);
      transition: 0.2s;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #12121A;
      padding: 0 20px;
      color: #CCC;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
    }
    /* CTA */
    .cta-section {
      background: #0A0A0F;
      position: relative;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }