/* roulang page: index */
:root {
      --primary: #6C5CE7;
      --primary-glow: rgba(108, 92, 231, 0.5);
      --secondary: #00D2FF;
      --secondary-glow: rgba(0, 210, 255, 0.6);
      --bg-deep: #0A0E27;
      --bg-card: rgba(20, 25, 50, 0.7);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #7B8FAB;
      --border-dim: rgba(255,255,255,0.08);
      --border-glow: rgba(108,92,231,0.6);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 30px rgba(108,92,231,0.25);
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition: 300ms cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-head: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background: radial-gradient(circle at 20% 10%, #0D1135, #0A0E27 80%);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 全局背景网格纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image: linear-gradient(rgba(108,92,231,0.04) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(108,92,231,0.04) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: -2;
    }
    /* 粒子容器（模拟背景动画） */
    .particles {
      position: fixed; top:0; left:0; width:100%; height:100%;
      pointer-events: none; z-index: -1;
      background: radial-gradient(circle at 30% 40%, rgba(0,210,255,0.05) 0%, transparent 50%),
                  radial-gradient(circle at 70% 60%, rgba(108,92,231,0.06) 0%, transparent 60%);
    }

    /* 导航栏 */
    .site-header {
      position: fixed; top: 0; left: 0; width: 100%; z-index: 100;
      background: rgba(10,14,39,0.8); backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s, box-shadow 0.3s;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      background: rgba(10,14,39,0.95);
      box-shadow: 0 4px 24px rgba(0,0,0,0.6);
    }
    .header-inner {
      display: flex; align-items: center; justify-content: space-between;
      width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px;
    }
    .logo {
      font-family: var(--font-head); font-weight: 700; font-size: 1.6rem;
      background: linear-gradient(135deg, #6C5CE7, #00D2FF);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text; display: flex; align-items: center; gap: 6px;
      text-decoration: none;
    }
    .logo i { color: #00D2FF; font-size: 1.9rem; text-shadow: 0 0 15px var(--secondary-glow); }
    .nav-links { display: flex; gap: 2.2rem; align-items: center; }
    .nav-links a {
      color: var(--text-secondary); text-decoration: none; font-weight: 500;
      position: relative; padding: 8px 0; transition: color 0.3s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--secondary);
      text-shadow: 0 0 10px var(--secondary-glow);
    }
    .nav-links a::after {
      content: ''; position: absolute; bottom: -4px; left: 0; width: 100%; height: 2px;
      background: var(--secondary); transform: scaleX(0); transition: transform 0.3s;
      box-shadow: 0 0 14px var(--secondary);
    }
    .nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
    .nav-cta {
      background: linear-gradient(135deg, #6C5CE7, #00D2FF);
      color: white; padding: 10px 24px; border-radius: 50px;
      font-weight: 600; text-decoration: none; box-shadow: 0 0 18px var(--primary-glow);
      transition: 0.3s; margin-left: 1rem;
    }
    .nav-cta:hover { box-shadow: 0 0 28px var(--secondary-glow); transform: scale(1.04); color: white; }
    .menu-toggle { display: none; font-size: 1.8rem; color: var(--secondary); cursor: pointer; }

    /* 通用板块 */
    section { padding: 100px 0; }
    .section-title {
      font-size: clamp(2rem, 5vw, 2.8rem); font-weight: 700; color: white;
      margin-bottom: 1rem; position: relative; display: inline-block;
    }
    .section-title::before {
      content: ''; display: inline-block; width: 50px; height: 4px;
      background: var(--secondary); margin-right: 16px; vertical-align: middle;
      border-radius: 4px; box-shadow: 0 0 12px var(--secondary);
    }
    .glass-card {
      background: var(--bg-card); backdrop-filter: blur(20px);
      border: 1px solid var(--border-dim); border-radius: var(--radius-card);
      box-shadow: var(--shadow-card); transition: var(--transition);
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: 0 0 32px rgba(108,92,231,0.3);
      transform: translateY(-5px);
    }

    /* Hero */
    .hero-grid {
      display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px;
      align-items: center; min-height: 85vh;
    }
    .hero-left h1 {
      font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800;
      background: linear-gradient(to right, #fff, #00D2FF); -webkit-background-clip: text;
      -webkit-text-fill-color: transparent; background-clip: text;
      line-height: 1.2; margin-bottom: 1.5rem;
    }
    .hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; margin: 2rem 0; }
    .btn-primary {
      background: linear-gradient(135deg, #6C5CE7, #00D2FF); color: white;
      border-radius: 50px; padding: 14px 36px; font-weight: 600;
      box-shadow: 0 0 25px var(--primary-glow); text-decoration: none;
      transition: 0.3s; display: inline-block;
    }
    .btn-primary:hover { box-shadow: 0 0 40px var(--secondary-glow); transform: scale(1.05); color: white; }
    .btn-outline {
      border: 2px solid rgba(0,210,255,0.6); color: var(--secondary);
      border-radius: 50px; padding: 14px 36px; font-weight: 600;
      text-decoration: none; transition: 0.3s;
    }
    .btn-outline:hover { background: rgba(0,210,255,0.1); box-shadow: 0 0 20px var(--secondary-glow); }

    .hero-image-card {
      background: rgba(20,25,50,0.6); backdrop-filter: blur(24px);
      border-radius: 28px; border: 1px solid rgba(255,255,255,0.1);
      padding: 12px; box-shadow: 0 0 40px rgba(0,210,255,0.2);
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid; grid-template-columns: 5fr 3fr 4fr; gap: 28px;
    }
    .highlight-item { padding: 28px; }
    .highlight-icon { font-size: 2.5rem; color: var(--secondary); margin-bottom: 1rem; text-shadow: 0 0 15px var(--secondary); }

    /* 案例瀑布 */
    .cases-masonry {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
    }
    .case-card img { width: 100%; height: 220px; object-fit: cover; display: block; border-radius: 16px 16px 0 0; filter: saturate(0.9); transition: 0.4s; }
    .case-card:hover img { filter: saturate(1.3) brightness(1.1); }
    .case-info { padding: 20px; }
    .tag { background: rgba(0,210,255,0.15); color: var(--secondary); padding: 4px 12px; border-radius: 30px; font-size: 0.75rem; }

    /* 方案对比 */
    .compare-table {
      display: grid; grid-template-columns: 1fr 1fr; gap: 0; max-width: 900px; margin: 0 auto;
    }
    .plan-card {
      background: var(--bg-card); backdrop-filter: blur(20px); border-radius: 20px;
      padding: 36px 28px; border: 1px solid var(--border-dim);
    }
    .plan-premium { border-color: var(--primary); box-shadow: 0 0 28px rgba(108,92,231,0.4); position: relative; }
    .badge-recommend {
      position: absolute; top: -12px; right: 20px; background: linear-gradient(135deg, #6C5CE7, #00D2FF);
      color: white; padding: 6px 18px; border-radius: 30px; font-size: 0.8rem; font-weight: 600;
    }

    /* FAQ */
    .faq-list { max-width: 800px; margin: 0 auto; }
    .faq-item {
      background: var(--bg-card); backdrop-filter: blur(16px); border-radius: 14px;
      margin-bottom: 18px; border: 1px solid var(--border-dim); cursor: pointer;
    }
    .faq-question { padding:20px 24px; display:flex; justify-content:space-between; align-items:center; font-weight:600; color:white; }
    .faq-answer { max-height:0; overflow:hidden; transition:0.4s; padding:0 24px; color:var(--text-secondary); }
    .faq-item.active .faq-answer { max-height:200px; padding-bottom:20px; }
    .faq-item.active { border-color: var(--primary); box-shadow: 0 0 20px var(--primary-glow); }

    /* 联系表单 */
    .contact-form {
      background: var(--bg-card); backdrop-filter: blur(20px); border-radius: 24px;
      padding: 40px; max-width: 620px; margin: 0 auto; border:1px solid var(--border-dim);
    }
    .input-glass {
      background: rgba(255,255,255,0.05); border:1px solid rgba(255,255,255,0.15);
      border-radius:10px; padding:14px 18px; width:100%; color:white; margin-bottom:20px;
    }
    .input-glass:focus { border-color: var(--secondary); box-shadow:0 0 12px var(--secondary-glow); outline:none; }

    /* Footer */
    .footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
    .social-icons i { font-size:1.5rem; color:var(--text-muted); margin-right:16px; transition:0.3s; }
    .social-icons i:hover { color:var(--secondary); text-shadow:0 0 12px var(--secondary); }

    @media (max-width:1024px) {
      .highlights-grid { grid-template-columns:1fr 1fr; }
      .cases-masonry { grid-template-columns:1fr 1fr; }
      .hero-grid { grid-template-columns:1fr; }
      .footer-grid { grid-template-columns:1fr 1fr; }
    }
    @media (max-width:640px) {
      .nav-links { display:none; }
      .menu-toggle { display:block; }
      .highlights-grid, .cases-masonry { grid-template-columns:1fr; }
      .compare-table { grid-template-columns:1fr; }
      .hero-buttons { flex-direction:column; }
    }