/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --bg-deep: #0B0F1A;
      --bg-card: #1A1F2E;
      --glass-bg: rgba(26, 31, 46, 0.6);
      --glass-border: rgba(0, 229, 255, 0.15);
      --accent-cyan: #00E5FF;
      --accent-orange: #FF6B35;
      --accent-green: #00C897;
      --text-white: #F0F2F5;
      --text-muted: rgba(240, 242, 245, 0.7);
      --font-heading: 'Inter', 'PingFang SC', 'Microsoft YaHei', '思源黑体', system-ui, sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --shadow-glow: 0 0 24px rgba(0, 229, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
      --border-radius-lg: 20px;
      --border-radius-md: 16px;
      --border-radius-btn: 50px;
      --transition: all 0.25s ease;
      --container-width: 1280px;
    }

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

    body {
      background-color: var(--bg-deep);
      font-family: var(--font-body);
      color: var(--text-white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(0, 229, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      background-position: center center;
    }

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

    /* 排版 */
    h1, h2, h3 {
      font-family: var(--font-heading);
      letter-spacing: -0.02em;
    }
    h1 { font-size: 42px; line-height: 1.2; font-weight: 800; }
    h2 { font-size: 32px; line-height: 1.3; font-weight: 700; margin-bottom: 16px; }
    h3 { font-size: 20px; line-height: 1.4; font-weight: 600; }
    p { font-size: 16px; line-height: 1.8; color: var(--text-muted); max-width: 680px; }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 15, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
      z-index: 1000;
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 24px;
      letter-spacing: -0.02em;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-cyan);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0B0F1A;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: var(--transition);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }
    .btn-primary-nav {
      background: var(--accent-cyan);
      color: #0B0F1A;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      text-decoration: none;
      box-shadow: 0 0 16px rgba(0,229,255,0.4);
      transition: var(--transition);
      margin-left: 16px;
    }
    .btn-primary-nav:hover {
      box-shadow: 0 0 28px rgba(0,229,255,0.8);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 15, 26, 0.95);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0,229,255,0.2);
      justify-content: space-around;
      padding: 8px 0;
      z-index: 999;
    }
    .mobile-bottom-nav a {
      color: var(--text-muted);
      font-size: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-decoration: none;
      font-weight: 500;
    }
    .mobile-bottom-nav a i { font-size: 20px; margin-bottom: 4px; }
    .mobile-bottom-nav a.active { color: var(--accent-cyan); }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }

    /* Hero */
    .hero {
      padding-top: 160px;
      padding-bottom: 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      background: radial-gradient(circle at 30% 30%, rgba(0,229,255,0.08) 0%, transparent 50%);
    }
    .hero-left { flex: 1; }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 28px;
      box-shadow: 0 0 60px rgba(0,229,255,0.2);
      position: relative;
      overflow: hidden;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,15,26,0.5), transparent);
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .btn-glow {
      background: var(--accent-cyan);
      color: #0B0F1A;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      text-decoration: none;
      box-shadow: 0 0 28px rgba(0,229,255,0.6), 0 4px 12px rgba(0,0,0,0.3);
      transition: var(--transition);
      display: inline-block;
    }
    .btn-glow:hover {
      box-shadow: 0 0 48px rgba(0,229,255,0.9);
      transform: scale(1.04);
    }
    .btn-outline {
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline:hover { background: rgba(0,229,255,0.08); }

    /* 统计看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-lg);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 36px;
      color: var(--accent-cyan);
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 4px;
    }
    .stat-label { font-size: 14px; color: var(--text-muted); margin-top: 8px; }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--border-radius-md);
      padding: 32px 24px;
      transition: var(--transition);
      border: 1px solid transparent;
      box-shadow: 0 4px 24px rgba(0,0,0,0.3);
    }
    .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);
      margin-bottom: 18px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      padding: 0 12px;
    }
    .step-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--accent-cyan);
    }

    /* 对比 */
    .compare-box {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .compare-card {
      flex: 1;
      background: var(--bg-card);
      border-radius: var(--border-radius-lg);
      padding: 32px;
    }
    .vs-badge {
      background: var(--accent-cyan);
      color: #0B0F1A;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .faq-question {
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      padding: 20px 0;
      color: var(--accent-cyan);
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, rgba(0,229,255,0.1) 0%, transparent 70%);
    }
    .email-input {
      background: rgba(26,31,46,0.8);
      border: 1px solid var(--glass-border);
      border-radius: 40px;
      padding: 14px 24px;
      color: white;
      width: 280px;
    }

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

    @media (max-width: 1024px) {
      .hero { flex-direction: column; }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .nav-links, .btn-primary-nav { display: none; }
      .hamburger { display: block; }
      .mobile-bottom-nav { display: flex; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-box { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; gap: 24px; }
      .hero-buttons .btn-glow, .hero-buttons .btn-outline { width: 100%; text-align: center; }
    }