/* roulang page: index */
:root {
      --primary-deep-purple: #1A0A2E;
      --electric-purple: #7B2FBE;
      --neon-cyan: #00F0FF;
      --warm-gold: #F5A623;
      --deep-space: #0D0D1A;
      --glass-bg: rgba(13, 13, 26, 0.7);
      --glass-border: rgba(123, 47, 190, 0.3);
      --white-full: #FFFFFF;
      --text-muted: rgba(255, 255, 255, 0.7);
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.3);
      --font-orbitron: 'Orbitron', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --container-max: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--primary-deep-purple);
      color: var(--white-full);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 10%, rgba(123,47,190,0.25) 0%, transparent 50%), 
                        radial-gradient(circle at 80% 70%, rgba(0,240,255,0.08) 0%, transparent 55%);
      background-attachment: fixed;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(26, 10, 46, 0.8);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.25);
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .nav-left, .nav-right {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-muted);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      transition: color 0.2s, text-shadow 0.2s;
    }
    .nav-link:hover {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0,240,255,0.6);
    }
    .logo-center {
      font-family: var(--font-orbitron);
      font-weight: 700;
      font-size: 1.8rem;
      background: linear-gradient(135deg, var(--neon-cyan) 0%, #a78bfa 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--neon-cyan);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: rgba(13, 13, 26, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      border-bottom: 1px solid var(--neon-cyan);
      z-index: 40;
    }
    .mobile-menu.active {
      display: flex;
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      padding: 60px 0 70px;
      min-height: 85vh;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-title {
      font-family: var(--font-orbitron);
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, #e0d4ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--electric-purple), #9b4dff);
      color: var(--neon-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 4px 18px rgba(123,47,190,0.5);
      text-transform: uppercase;
      letter-spacing: 0.8px;
      animation: pulse-glow 2s infinite;
    }
    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--neon-cyan);
      color: var(--neon-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.12);
      box-shadow: 0 0 18px rgba(0,240,255,0.5);
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }
    .geometric-art {
      width: 100%;
      max-width: 480px;
      height: 380px;
      background: radial-gradient(circle at 30% 30%, rgba(123,47,190,0.5), transparent 70%);
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hex-animation {
      width: 200px;
      height: 200px;
      background: conic-gradient(from 0deg, var(--neon-cyan), var(--electric-purple), var(--neon-cyan));
      clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
      opacity: 0.5;
      animation: spinSlow 12s linear infinite;
      filter: blur(1px);
    }
    @keyframes spinSlow { to { transform: rotate(360deg); } }
    @keyframes pulse-glow { 0% { box-shadow: 0 0 8px rgba(123,47,190,0.7); } 50% { box-shadow: 0 0 28px rgba(0,240,255,0.9); } 100% { box-shadow: 0 0 8px rgba(123,47,190,0.7); } }
    /* 指标看板 */
    .metrics {
      padding: 50px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 28px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }
    .metric-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: var(--shadow-glow);
    }
    .metric-number {
      font-family: var(--font-orbitron);
      font-size: 42px;
      color: var(--neon-cyan);
      font-weight: 700;
    }
    .metric-label {
      color: var(--warm-gold);
      margin-top: 8px;
      font-weight: 600;
    }
    /* 服务矩阵 */
    .services {
      padding: 70px 0;
    }
    .section-title {
      font-family: var(--font-orbitron);
      font-size: 38px;
      margin-bottom: 40px;
      text-align: center;
      color: #fff;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: 0.3s;
    }
    .service-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 28px rgba(0,240,255,0.45);
    }
    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .service-info {
      padding: 20px;
    }
    .service-info h3 {
      font-size: 1.4rem;
      margin-bottom: 8px;
    }
    /* 对比 */
    .compare {
      padding: 60px 0;
    }
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-card {
      background: rgba(13,13,26,0.8);
      border-radius: var(--radius-card);
      padding: 32px;
      backdrop-filter: blur(10px);
    }
    .traditional {
      border: 1px solid #4a4a5a;
      opacity: 0.8;
    }
    .long8-card {
      border: 1px solid var(--electric-purple);
      box-shadow: 0 0 35px rgba(123,47,190,0.5);
      position: relative;
    }
    .long8-card::after {
      content: "★ 头号玩家方案";
      position: absolute;
      top: -18px;
      right: 20px;
      background: var(--warm-gold);
      color: #000;
      padding: 4px 18px;
      border-radius: 20px;
      font-weight: bold;
    }
    /* FAQ */
    .faq {
      padding: 60px 0;
    }
    .accordion {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: rgba(13,13,26,0.7);
      border-left: 4px solid var(--neon-cyan);
      border-radius: 10px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--warm-gold);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(0,240,255,0.05);
      color: #ddd;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    /* 表单 */
    .contact {
      padding: 70px 0;
      background: radial-gradient(circle at center, #2a1040, #0a0015);
    }
    .form-card {
      max-width: 640px;
      margin: 0 auto;
      background: rgba(13,13,26,0.7);
      backdrop-filter: blur(16px);
      border: 1px solid var(--neon-cyan);
      border-radius: 24px;
      padding: 40px;
    }
    .form-input {
      width: 100%;
      background: rgba(255,255,255,0.07);
      border: 1px solid rgba(0,240,255,0.4);
      border-radius: 8px;
      padding: 14px;
      margin-bottom: 20px;
      color: white;
    }
    .form-input:focus {
      border-color: var(--neon-cyan);
      outline: none;
      box-shadow: 0 0 12px var(--neon-cyan);
    }
    .btn-gold {
      background: var(--warm-gold);
      border: none;
      padding: 14px 28px;
      font-weight: bold;
      border-radius: 8px;
      cursor: pointer;
      width: 100%;
    }
    footer {
      text-align: center;
      padding: 40px 0;
      color: rgba(255,255,255,0.5);
    }
    @media (max-width: 1024px) {
      .hero-title { font-size: 40px; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-left, .nav-right { display: none; }
      .hamburger { display: flex; }
      .hero { flex-direction: column; text-align: center; }
      .compare-row { grid-template-columns: 1fr; }
    }