/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00E5FF;
      --accent-red: #FF3D00;
      --card-bg: rgba(26, 31, 58, 0.7);
      --border-subtle: #2A2F4A;
      --text-body: #B0B8D0;
      --text-white: #FFFFFF;
      --glass-border: rgba(0, 229, 255, 0.15);
      --shadow-glow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-card: 16px;
      --radius-btn: 8px;
      --font-mono: 'Roboto Mono', 'Courier New', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      background-color: var(--primary-deep);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
      transition: background 0.3s ease, box-shadow 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: 1px;
      color: var(--text-white);
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .logo .cyan-dot {
      color: var(--accent-cyan);
    }

    .logo small {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-body);
      letter-spacing: 2px;
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }

    .btn-glow {
      background: var(--accent-cyan);
      color: #0A0E27;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 18px rgba(0, 229, 255, 0.5);
      border: none;
      cursor: pointer;
      transition: 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

    .btn-glow:hover {
      box-shadow: 0 0 28px rgba(0, 229, 255, 0.8);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: 0.25s;
    }

    .btn-ghost:hover {
      background: rgba(0, 229, 255, 0.08);
      border-color: #fff;
      color: #fff;
    }

    .btn-red-glow {
      background: var(--accent-red);
      color: #fff;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 20px rgba(255, 61, 0, 0.5);
      border: none;
      cursor: pointer;
      transition: 0.25s;
    }

    .btn-red-glow:hover {
      box-shadow: 0 0 30px rgba(255, 61, 0, 0.8);
      transform: scale(1.02);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--accent-cyan);
      font-size: 28px;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, #1a1f3a 0%, #0A0E27 80%);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-white);
      margin-bottom: 24px;
    }

    .hero-title span {
      color: var(--accent-cyan);
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 40px;
      max-width: 90%;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .live-panel {
      background: var(--card-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .live-stat {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding-bottom: 16px;
    }

    .live-number {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    .live-label {
      color: var(--text-body);
      font-size: 15px;
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-body);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
      font-size: 17px;
    }

    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 36px 24px;
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .service-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-6px);
      box-shadow: 0 12px 36px rgba(0,0,0,0.5);
    }

    .service-icon {
      font-size: 32px;
      color: var(--accent-cyan);
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: #fff;
    }

    /* 对比 */
    .comparison-row {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 32px;
      align-items: center;
    }

    .vs-badge {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-red);
    }

    .compare-card {
      background: rgba(26,31,58,0.8);
      border-radius: 20px;
      padding: 36px;
    }

    .compare-card.bright {
      border: 1px solid var(--accent-cyan);
    }

    .check-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 16px 0;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .case-card {
      background: rgba(26,31,58,0.7);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 32px;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }

    .case-overlay {
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(8px);
      padding: 32px;
      border-radius: 24px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      color: #fff;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      color: var(--text-body);
      margin-top: 12px;
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* 表单 */
    .contact-form {
      background: var(--card-bg);
      backdrop-filter: blur(15px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 48px;
      max-width: 600px;
      margin: 0 auto;
    }

    .form-input {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-subtle);
      padding: 14px;
      border-radius: 8px;
      color: #fff;
      margin-bottom: 20px;
    }

    footer {
      background: #06091a;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .data-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .comparison-row { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .hero-title { font-size: 36px; }
      .data-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
    }