/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-card: rgba(255, 255, 255, 0.06);
      --border-card: rgba(255, 255, 255, 0.10);
      --text-primary: #E2E8F0;
      --text-white: #FFFFFF;
      --text-muted: #94A3B8;
      --neon-cyan: #00F0FF;
      --neon-purple: #A855F7;
      --gradient-btn: linear-gradient(135deg, #00F0FF, #A855F7);
      --shadow-cyan: 0 4px 20px rgba(0, 240, 255, 0.2);
      --shadow-purple: 0 4px 20px rgba(168, 85, 247, 0.2);
      --radius-lg: 16px;
      --radius-md: 8px;
      --radius-sm: 4px;
      --transition: all 0.3s ease;
      --max-width: 1200px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      transition: background 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-white);
      text-decoration: none;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--neon-cyan);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--gradient-btn);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-md);
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      font-size: 0.95rem;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.7);
      transform: scale(1.05);
      color: #0A0E27;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(0,240,255,0.5);
      color: var(--neon-cyan);
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--neon-cyan);
      border-radius: 2px;
      transition: 0.3s;
    }
    /* 区块通用 */
    section {
      padding: clamp(4rem, 8vw, 7rem) 0;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 1.5rem;
      letter-spacing: -0.02em;
      line-height: 1.3;
      text-align: center;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }
    /* Hero */
    .hero {
      background: radial-gradient(circle at 30% 40%, #1E1B4B, #0A0E27 80%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-bottom: 2rem;
    }
    .trust-badge {
      color: var(--text-muted);
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .dashboard-mini {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-lg);
      padding: 1.8rem;
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.2rem;
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    }
    .stat-item {
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0,240,255,0.5);
    }
    /* 数据看板 */
    .data-board {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      margin-top: -2rem;
      position: relative;
      z-index: 2;
    }
    .data-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 1.8rem;
      text-align: center;
      transition: var(--transition);
    }
    .data-card:hover {
      border-color: rgba(255,255,255,0.25);
      transform: translateY(-4px);
    }
    .data-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--neon-cyan);
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .service-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      transition: var(--transition);
    }
    .service-card:hover {
      border-color: rgba(255,255,255,0.25);
      box-shadow: 0 12px 28px rgba(0,0,0,0.5);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--neon-cyan);
      margin-bottom: 1.2rem;
    }
    .service-card h3 {
      font-size: 1.3rem;
      margin-bottom: 0.8rem;
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step {
      flex: 1;
      text-align: center;
      padding: 0 1rem;
    }
    .step-circle {
      width: 50px;
      height: 50px;
      background: rgba(255,255,255,0.08);
      border-radius: 50%;
      margin: 0 auto 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: white;
      border: 2px solid transparent;
      transition: 0.3s;
    }
    .step.active .step-circle {
      background: var(--neon-cyan);
      color: #0A0E27;
      box-shadow: 0 0 18px var(--neon-cyan);
    }
    /* 对比 */
    .comparison-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .compare-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      padding: 2rem;
    }
    .compare-card.ours {
      border: 1px solid var(--neon-cyan);
      box-shadow: 0 0 22px rgba(0,240,255,0.25);
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.2rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 1.2rem 1.2rem;
      color: var(--text-muted);
    }
    /* CTA */
    .cta-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      padding: 3rem;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .input-field {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: var(--radius-md);
      padding: 0.8rem 1rem;
      color: white;
      width: 100%;
      max-width: 320px;
    }
    .input-field:focus {
      border-color: var(--neon-cyan);
      outline: none;
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    footer {
      background: #060B1A;
      padding: 3rem 0;
      border-top: 1px solid rgba(0,240,255,0.15);
      color: var(--text-muted);
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .data-board { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-links { display: none; position: absolute; top:70px; left:0; width:100%; background:#0A0E27; flex-direction:column; padding:2rem; }
      .nav-links.active { display: flex; }
      .hero-grid { flex-direction: column; }
      .services-grid { grid-template-columns: 1fr; }
      .comparison-table { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; gap: 2rem; }
    }