/* roulang page: index */
:root {
      --deep-blue: #0B1120;
      --dark-card: #151B2E;
      --card-border: rgba(0, 240, 255, 0.08);
      --electric-cyan: #00D4FF;
      --electric-cyan-hover: #00eaff;
      --competition-orange: #FF8C42;
      --track-white: #F2F4F8;
      --text-gray: #B0B8D0;
      --text-muted: #6B7280;
      --nav-bg: rgba(255, 255, 255, 0.96);
      --shadow-sm: 0 1px 8px rgba(0,0,0,0.06);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 32px rgba(0, 212, 255, 0.15);
      --border-radius-card: 16px;
      --border-radius-btn: 30px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Rajdhani", "SF Mono", monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--track-white);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }
    .bg-dark-card {
      background-color: var(--dark-card);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-card);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.02), var(--shadow-card);
    }
    .text-cyan {
      color: var(--electric-cyan) !important;
    }
    .text-orange {
      color: var(--competition-orange) !important;
    }
    .text-gray {
      color: var(--text-gray);
    }
    .btn-cyan {
      background: var(--electric-cyan);
      border: none;
      color: #0B1120;
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      padding: 0.7rem 2rem;
      transition: all 0.25s ease;
      box-shadow: 0 2px 8px rgba(0,212,255,0.2);
    }
    .btn-cyan:hover {
      background: #ffffff;
      color: #0B1120;
      box-shadow: 0 0 20px rgba(0,212,255,0.6);
      transform: scale(1.02);
    }
    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--electric-cyan);
      color: var(--electric-cyan);
      font-weight: 500;
      border-radius: var(--border-radius-btn);
      padding: 0.7rem 2rem;
      transition: all 0.25s ease;
    }
    .btn-outline-cyan:hover {
      background: rgba(0, 212, 255, 0.15);
      border-color: #ffffff;
      color: #ffffff;
      box-shadow: 0 0 16px rgba(0,212,255,0.4);
    }
    .btn-orange {
      background: var(--competition-orange);
      border: none;
      color: #0B1120;
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      padding: 0.8rem 2.2rem;
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(255,140,66,0.3);
    }
    .btn-orange:hover {
      background: #ffa55c;
      color: #000;
      box-shadow: 0 0 24px rgba(255,140,66,0.7);
      transform: scale(1.03);
    }
    .section-padding {
      padding: 90px 0;
    }
    .separator-glow {
      height: 2px;
      background: linear-gradient(90deg, transparent, rgba(0,212,255,0.2), transparent);
      margin: 0 auto;
      width: 80%;
    }
    /* 导航 */
    .navbar {
      background: var(--nav-bg);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-sm);
      height: 70px;
      transition: all 0.3s;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: #0A0E27 !important;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    .navbar-brand i {
      color: var(--electric-cyan);
      margin-right: 8px;
      font-size: 1.8rem;
    }
    .nav-link {
      color: #4A5568 !important;
      font-weight: 500;
      margin: 0 0.3rem;
      transition: 0.2s;
      padding: 0.5rem 0.8rem;
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--electric-cyan) !important;
      border-bottom-color: var(--electric-cyan);
    }
    .search-box {
      background: #f1f3f5;
      border-radius: 20px;
      padding: 0.4rem 1rem;
      color: #4A5568;
      border: 1px solid #e2e8f0;
      width: 160px;
    }
    .offcanvas-menu {
      background: #FFFFFF;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, rgba(0,180,255,0.12) 0%, transparent 50%), 
                  linear-gradient(135deg, #0B1120 0%, #0A0E27 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      background-image: linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px), 
                        linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 5vw, 3.8rem);
      font-weight: 700;
      background: linear-gradient(to right, #00D4FF, #ffffff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .data-pulse {
      animation: pulse 1.8s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.4; transform: scale(0.9); }
      50% { opacity: 1; transform: scale(1); }
      100% { opacity: 0.4; transform: scale(0.9); }
    }
    .scroll-indicator {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--electric-cyan);
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
      40% { transform: translateY(12px); }
      60% { transform: translateY(6px); }
    }
    /* 卡片悬停 */
    .service-card {
      transition: all 0.3s ease;
    }
    .service-card:hover {
      border-color: rgba(0, 212, 255, 0.35);
      box-shadow: 0 12px 32px rgba(0, 212, 255, 0.2);
      transform: translateY(-6px);
    }
    .number-counter {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--competition-orange);
    }
    .accordion-button {
      background-color: var(--dark-card);
      color: white;
      border: 1px solid var(--card-border);
      font-weight: 500;
    }
    .accordion-button:not(.collapsed) {
      background-color: #1E2538;
      color: var(--electric-cyan);
      border-left: 3px solid var(--electric-cyan);
    }
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 12px;
    }
    footer a {
      color: var(--text-gray);
      text-decoration: none;
    }
    footer a:hover {
      color: var(--electric-cyan);
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
      }
    }