/* roulang page: index */
:root {
      --primary: #00F0A8;
      --secondary: #A855F7;
      --bg-deep: #0A0E17;
      --bg-card: #111827;
      --bg-section: #0F1520;
      --text-white: #FFFFFF;
      --text-body: #CBD5E1;
      --text-muted: #64748B;
      --accent: #F59E0B;
      --border-light: rgba(255, 255, 255, 0.06);
      --border-card: rgba(255, 255, 255, 0.08);
      --glass-bg: rgba(17, 24, 39, 0.7);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 48px rgba(0, 240, 168, 0.15);
      --radius-lg: 16px;
      --radius-xl: 20px;
      --radius-btn: 12px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

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

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.6);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.3s ease;
    }
    .header.scrolled {
      background: rgba(10, 14, 23, 0.9);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-white);
      letter-spacing: -0.5px;
    }
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-nav {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 8px 20px;
      border-radius: 24px;
      font-weight: 600;
      transition: all 0.25s;
      margin-left: 8px;
    }
    .btn-nav:hover {
      background: rgba(0, 240, 168, 0.1);
      box-shadow: 0 0 16px rgba(0,240,168,0.3);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-white);
      background: none;
      border: none;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0A0E17;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .btn-nav {
        margin-left: 0;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(168,85,247,0.08) 0%, transparent 50%), 
                  radial-gradient(circle at 80% 20%, rgba(0,240,168,0.06) 0%, transparent 45%);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      flex: 1 1 50%;
      z-index: 2;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.15;
      color: var(--text-white);
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #0A0E17;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      box-shadow: 0 0 24px rgba(0,240,168,0.5);
      transition: all 0.25s;
      font-size: 1rem;
    }
    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0,240,168,0.8);
      background: #33F3BA;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(0,240,168,0.1);
    }
    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .floating-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 20px;
      width: 260px;
      box-shadow: var(--shadow-card);
      color: var(--text-white);
    }
    .live-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(245,158,11,0.15);
      color: var(--accent);
      font-weight: 600;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .live-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse { 0%{opacity:1;} 50%{opacity:0.4;} 100%{opacity:1;} }
    .score {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 120px 0 60px;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-visual {
        margin-top: 40px;
      }
      .btn-group {
        justify-content: center;
      }
    }

    section {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-glass {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }
    .card-glass:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .grid-3 { grid-template-columns: 1fr; }
    }

    .live-data-grid .team {
      font-weight: 600;
    }
    .metric {
      font-family: var(--font-mono);
      color: var(--primary);
    }

    .advantages i {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .service-card img {
      border-radius: 16px 16px 0 0;
      height: 160px;
      object-fit: cover;
      width: 100%;
    }
    .tag {
      background: rgba(168,85,247,0.2);
      color: var(--secondary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }

    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    .step-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      color: var(--primary);
    }
    .dash {
      flex: 0.2;
      border-top: 2px dashed rgba(0,240,168,0.3);
      margin: 0 8px;
    }
    @media (max-width: 768px) {
      .process-steps { flex-direction: column; gap: 24px; }
      .dash { display: none; }
    }

    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-xl);
      padding: 40px 24px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .case-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,14,23,0.7);
    }
    .case-content {
      position: relative;
      z-index: 2;
    }
    @media (max-width: 768px) {
      .cases-grid { grid-template-columns: 1fr; }
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-white);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }

    .cta-section {
      background: #0F1520;
      text-align: center;
      padding: 80px 24px;
    }

    .footer {
      background: #060A10;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }