/* roulang page: index */
/* ===== 设计变量与全局重置 ===== */
    :root {
      --primary-deep: #0A0E27;
      --primary-card: #111633;
      --accent-cyan: #00E5FF;
      --accent-gold: #FFB800;
      --text-white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #7B8AB8;
      --success: #00E676;
      --danger: #FF5252;
      --glass-bg: rgba(17, 22, 51, 0.6);
      --glass-border: rgba(0, 229, 255, 0.15);
      --radius-xl: 20px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-pill: 20px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.5);
      --font-sans: 'Inter', 'MiSans', 'PingFang SC', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    /* 自定义容器，最大宽度1280px居中 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 768px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 玻璃拟态卡片基类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
    }

    .glass-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 255, 0.4);
      box-shadow: 0 12px 40px rgba(0, 229, 255, 0.15), inset 0 1px 0 rgba(255,255,255,0.08);
    }

    /* 发光按钮主样式 */
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #0088CC);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-glow);
      cursor: pointer;
      transition: all var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.8);
      filter: brightness(1.2);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 13px 31px;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all var(--transition-smooth);
      text-decoration: none;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: #fff;
      color: #fff;
    }

    /* 脉冲动画用于CTA按钮 */
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 20px rgba(0, 229, 255, 0.5); }
      50% { box-shadow: 0 0 35px rgba(0, 229, 255, 0.8), 0 0 15px rgba(255, 184, 0, 0.4); }
      100% { box-shadow: 0 0 20px rgba(0, 229, 255, 0.5); }
    }

    .pulse-cta {
      animation: pulse-glow 2.2s infinite ease-in-out;
    }

    /* 导航样式 */
    .navbar {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
      position: sticky;
      top: 0;
      z-index: 50;
    }

    .nav-link {
      color: var(--text-body);
      transition: color var(--transition-smooth);
      font-weight: 500;
    }

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

    /* 移动端菜单 */
    .mobile-menu {
      background: rgba(10, 14, 39, 0.98);
      backdrop-filter: blur(24px);
      transition: opacity 0.3s ease;
    }

    /* 标题层级 */
    h1, h2, h3, h4 {
      color: var(--text-white);
      line-height: 1.3;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
      position: relative;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
    }
    .faq-question {
      background: rgba(17, 22, 51, 0.5);
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #fff;
      transition: background var(--transition-smooth);
    }
    .faq-question:hover {
      background: rgba(0, 229, 255, 0.1);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      background: rgba(10, 14, 39, 0.6);
      color: var(--text-body);
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    .faq-icon {
      color: var(--accent-cyan);
      font-size: 1.4rem;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 步骤条 */
    .step-number {
      background: linear-gradient(135deg, #00E5FF, #0088CC);
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #0A0E27;
      font-size: 1.3rem;
      box-shadow: 0 0 16px rgba(0,229,255,0.4);
    }

    /* 案例瀑布流网格 */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    @media (max-width: 1024px) {
      .masonry-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .masonry-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 背景星光粒子轻微动画 */
    .hero-bg-animate {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-bg-animate::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.15) 0%, transparent 60%);
      pointer-events: none;
    }

    /* 页脚链接组 */
    .footer-link {
      color: var(--text-muted);
      transition: color 0.2s;
      text-decoration: none;
    }
    .footer-link:hover {
      color: var(--accent-cyan);
    }