/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-deep: #0A0E27;
      --bg-dark: #060918;
      --card-bg: #0F1335;
      --accent-cyan: #00F0FF;
      --accent-purple: #7B2FFF;
      --accent-red: #FF3D5A;
      --text-primary: #E8ECFF;
      --text-secondary: #8890B5;
      --text-white: #FFFFFF;
      --border-glow: rgba(0, 240, 255, 0.15);
      --shadow-cyan: 0 8px 32px rgba(0, 240, 255, 0.08);
      --radius-lg: 16px;
      --radius-md: 10px;
      --transition-bounce: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --max-width: 1280px;
      --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    /* 等宽数字全局应用 */
    .mono, .counter, .data-digit, .ticker-number, .latency-value {
      font-family: var(--font-mono);
      font-weight: 600;
    }

    a, button, input {
      transition: var(--transition-bounce);
    }

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

    /* ----- 导航栏 (沉浸式固定) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(6, 9, 24, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
    }

    .site-header.scrolled {
      background: rgba(6, 9, 24, 0.97);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-white);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, var(--accent-cyan), #0099FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    .btn-nav {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 8px 20px;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
    }
    .btn-nav:hover {
      background: rgba(0, 240, 255, 0.15);
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.3);
    }

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

    /* 移动端抽屉菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(6, 9, 24, 0.98);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.4s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.5rem;
      color: var(--text-white);
      text-decoration: none;
    }
    .mobile-menu .btn-nav {
      margin-top: 20px;
      font-size: 1.2rem;
    }

    /* ----- 首屏 Hero ----- */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--primary-deep);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.12) 0%, transparent 60%);
    }
    /* 动态粒子网络 (canvas) */
    #particleCanvas {
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin-top: -40px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 3.5rem);
      font-weight: 800;
      line-height: 1.25;
      background: linear-gradient(to right, #00F0FF, #7B2FFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 600px;
    }
    .ticker-bar {
      background: rgba(15, 19, 53, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glow);
      border-radius: 40px;
      padding: 10px 24px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 2.2rem;
      color: var(--accent-cyan);
    }
    .pulse-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-red);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--accent-red);
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse { 0% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(1.3); } 100% { opacity: 1; transform: scale(1); } }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0099FF);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      cursor: pointer;
      text-decoration: none;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
    }
    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent-cyan);
      font-size: 1.5rem;
      animation: bounce 2s infinite;
    }
    @keyframes bounce { 0%,100%{transform:translateY(0);} 50%{transform:translateY(8px);} }

    /* ----- 通用板块样式 ----- */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60%;
      height: 4px;
      background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
      border-radius: 2px;
    }
    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 服务卡片错位栅格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: rgba(15, 19, 53, 0.7);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s;
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,255,0.5);
      box-shadow: 0 16px 40px rgba(0,240,255,0.12);
    }
    .card-main {
      grid-column: span 2;
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .live-indicator {
      position: absolute;
      bottom: 16px;
      left: 32px;
      display: flex;
      align-items: center;
      gap: 6px;
      color: #00F0FF;
      font-size: 0.8rem;
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent-cyan);
    }

    /* 数据计数器 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-item {
      background: rgba(15,19,53,0.5);
      border-radius: var(--radius-lg);
      padding: 32px 16px;
    }
    .stat-number {
      font-size: 2.8rem;
      color: var(--accent-cyan);
      font-family: var(--font-mono);
    }
    .stat-label {
      color: var(--accent-purple);
      font-weight: 600;
      margin-top: 8px;
    }

    /* 技术架构交替 */
    .tech-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 60px;
    }
    .tech-row.reverse {
      flex-direction: row-reverse;
    }
    .tech-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .tech-text {
      flex: 1;
    }

    /* 合作案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 280px;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid var(--border-glow);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA 全局 */
    .cta-section {
      background: linear-gradient(135deg, #0A0E27, #1A1040);
      text-align: center;
      border-radius: 32px;
      margin: 60px 0;
    }
    .cta-input {
      display: flex;
      max-width: 500px;
      margin: 24px auto;
      gap: 12px;
    }
    .cta-input input {
      flex:1;
      padding: 14px;
      background: rgba(255,255,255,0.1);
      border:1px solid var(--accent-purple);
      border-radius: var(--radius-md);
      color: white;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: 1fr; }
      .card-main { grid-column: span 1; flex-direction: column; }
      .tech-row { flex-direction: column; }
      .tech-row.reverse { flex-direction: column; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 2.2rem; }
      .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }