/* roulang page: index */
:root {
      --deep-bg: #0A0E27;
      --card-bg: rgba(20, 27, 51, 0.85);
      --cyan-highlight: #00F0FF;
      --orange-accent: #FF6B35;
      --purple-data: #7B2FFF;
      --text-primary: #E8EDF5;
      --text-secondary: #B0C4DE;
      --text-muted: #5A6B8C;
      --border-dim: rgba(0, 240, 255, 0.15);
      --border-cyan: rgba(0, 240, 255, 0.4);
      --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
      --shadow-glow-cyan: 0 0 20px rgba(0, 240, 255, 0.4);
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-xs: 6px;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
      --max-width: 1280px;
      --space-section: 80px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s, opacity 0.2s;
    }

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-cyan);
      transition: background 0.3s;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.95);
      box-shadow: 0 4px 15px rgba(0,0,0,0.6);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-weight: 900;
      font-size: 1.8rem;
      letter-spacing: 1px;
      color: var(--cyan-highlight);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    .logo i {
      font-size: 2rem;
      color: var(--orange-accent);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      padding: 6px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan-highlight);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: transparent;
      border: 1.5px solid var(--cyan-highlight);
      color: var(--cyan-highlight);
      padding: 10px 22px;
      border-radius: var(--radius-xs);
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.25s;
      cursor: pointer;
      margin-left: 10px;
    }

    .btn-nav:hover {
      background: var(--cyan-highlight);
      color: #0A0E27;
      box-shadow: 0 0 18px rgba(0,240,255,0.6);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--cyan-highlight);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(15px);
      border-top: 1px solid var(--border-cyan);
      z-index: 1000;
      justify-content: space-around;
      padding: 10px 0 12px;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.65rem;
      font-weight: 500;
      gap: 4px;
      transition: color 0.2s;
    }

    .mobile-bottom-nav a i {
      font-size: 1.3rem;
    }

    .mobile-bottom-nav a.active {
      color: var(--cyan-highlight);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(10,14,39,0.7) 0%, rgba(10,14,39,0.92) 90%);
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 900;
      letter-spacing: 0.5px;
      line-height: 1.2;
      color: #ffffff;
      text-shadow: 0 4px 15px rgba(0,240,255,0.3);
    }

    .hero .sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin: 24px 0 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF 0%, #0088CC 100%);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 4px 15px rgba(0,240,255,0.3);
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan-highlight);
      color: var(--cyan-highlight);
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: 0.25s;
    }

    .btn-outline:hover {
      background: var(--cyan-highlight);
      color: #0A0E27;
    }

    .hero-dashboard {
      flex: 1 1 400px;
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
    }

    .metric-card {
      background: var(--card-bg);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      padding: 20px 18px;
      width: 160px;
      text-align: center;
      backdrop-filter: blur(8px);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s;
    }

    .metric-card:hover {
      transform: translateY(-5px);
      border-color: var(--orange-accent);
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--cyan-highlight);
      animation: pulse-glow 2s infinite;
    }

    @keyframes pulse-glow {
      0% { text-shadow: 0 0 5px #00F0FF; }
      50% { text-shadow: 0 0 20px #00F0FF, 0 0 10px #0088CC; }
      100% { text-shadow: 0 0 5px #00F0FF; }
    }

    .metric-label {
      color: var(--text-secondary);
      font-size: 0.85rem;
      margin-top: 8px;
    }

    /* 通用区块 */
    section {
      padding: var(--space-section) 0;
    }

    .section-title {
      font-size: 2.3rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      margin-bottom: 16px;
      color: #fff;
    }

    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* 优势 #features 非对称布局 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 28px;
    }

    .feature-item {
      background: var(--card-bg);
      border-left: 4px solid var(--cyan-highlight);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s;
      backdrop-filter: blur(6px);
      display: flex;
      gap: 18px;
      align-items: flex-start;
    }

    .feature-item:hover {
      border-left-color: var(--orange-accent);
      transform: translateX(6px);
    }

    .feature-item.wide {
      grid-column: span 7;
    }
    .feature-item.narrow {
      grid-column: span 5;
    }

    .feature-icon {
      font-size: 2.4rem;
      color: var(--cyan-highlight);
    }

    .features-grid img {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      object-fit: cover;
    }

    /* 服务矩阵 */
    .services-layout {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .service-hero-card {
      background: linear-gradient(120deg, rgba(0,240,255,0.08) 0%, rgba(20,27,51,0.9) 100%);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-md);
      padding: 38px;
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
    }

    .service-row {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    .service-mini {
      flex: 1 1 200px;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      gap: 16px;
      transition: 0.25s;
    }

    .service-mini:hover {
      transform: translateY(-5px);
    }

    /* 数据对比 */
    .data-comparison {
      background: #060B1C;
      border-radius: var(--radius-md);
      padding: 3rem;
      display: flex;
      flex-wrap: wrap;
      gap: 35px;
    }

    .compare-row {
      display: flex;
      justify-content: space-between;
      width: 100%;
      align-items: center;
    }

    .live-val {
      font-family: var(--font-mono);
      font-size: 2rem;
      color: var(--cyan-highlight);
    }
    .history-val {
      color: var(--text-muted);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 15px 20px;
      cursor: pointer;
    }

    .faq-q {
      font-weight: 700;
      color: var(--cyan-highlight);
    }

    /* 表单 */
    .cta-section {
      background: #040816;
    }
    .form-group input, .form-group textarea {
      width: 100%;
      background: #0F132A;
      border: 1px solid var(--border-dim);
      color: white;
      padding: 14px;
      border-radius: var(--radius-xs);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr; }
      .feature-item.wide, .feature-item.narrow { grid-column: span 1; }
      .faq-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .navbar .nav-links { display: none; }
      .menu-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero h1 { font-size: 2.3rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .data-comparison { padding: 2rem; }
      .container { padding: 0 16px; }
      section { padding: 50px 0; }
    }