/* roulang page: index */
:root {
      --deep-midnight: #0A1128;
      --bg-gradient-end: #0F1B3D;
      --champagne-gold: #C9A96E;
      --electric-cyan: #00E5FF;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --text-primary: #F0F2F5;
      --text-secondary: #8A93A7;
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 12px 40px rgba(0,229,255,0.15);
      --radius-card: 12px;
      --radius-inner: 8px;
      --transition: 250ms ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background: radial-gradient(circle at 20% 10%, var(--deep-midnight), var(--bg-gradient-end));
      color: var(--text-primary);
      line-height: 1.5;
      font-size: 15px;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .top-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10,17,40,0.75);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
    }

    .logo {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo i {
      color: var(--champagne-gold);
      margin-right: 8px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color var(--transition);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--champagne-gold);
    }
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-midnight);
      font-weight: 600;
      font-size: 14px;
      padding: 12px 28px;
      border-radius: 50px;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 20px rgba(0,229,255,0.5);
      transition: all 200ms ease;
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
      min-width: 120px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.7);
      background: #33eaff;
      color: #0A1128;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: var(--text-primary);
      font-weight: 600;
      font-size: 14px;
      padding: 12px 28px;
      border-radius: 50px;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 200ms ease;
      letter-spacing: 0.5px;
    }
    .btn-ghost:hover {
      border-color: var(--champagne-gold);
      background: rgba(201,169,110,0.1);
      color: #fff;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--text-primary);
      cursor: pointer;
    }

    /* 移动导航面板 */
    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10,17,40,0.95);
      backdrop-filter: blur(30px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      display: none;
      z-index: 99;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .mobile-menu a {
      color: var(--text-primary);
      font-size: 18px;
      text-decoration: none;
    }
    .mobile-menu .btn-primary {
      width: 100%;
      margin-top: 12px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 400px;
    }
    .hero-left h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-left p {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1 1 500px;
      position: relative;
    }
    .hero-image {
      width: 100%;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
    }
    .floating-card {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: rgba(10,17,40,0.7);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 16px 20px;
      display: flex;
      gap: 20px;
      color: var(--text-primary);
      box-shadow: var(--card-shadow);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
      100% { transform: translateY(0); }
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(0,229,255,0.25);
    }
    .glass-card i {
      font-size: 32px;
      color: var(--electric-cyan);
      margin-bottom: 16px;
    }
    .glass-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .glass-card p {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 案例瀑布 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
    }
    .masonry-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .masonry-item img {
      width: 100%;
      display: block;
      height: auto;
    }
    .masonry-text {
      padding: 20px;
    }
    .masonry-text h4 {
      font-weight: 600;
      font-size: 18px;
      margin-bottom: 6px;
    }
    .tag {
      background: rgba(0,229,255,0.15);
      color: var(--electric-cyan);
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 对比表 */
    .compare-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1 1 280px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      position: relative;
    }
    .recommend {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--electric-cyan);
      color: #0A1128;
      padding: 4px 16px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 12px;
    }
    .highlight {
      border-color: var(--champagne-gold);
    }

    /* 数据带 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      text-align: center;
    }
    .stat-item h3 {
      font-size: 40px;
      font-weight: 700;
      color: var(--electric-cyan);
    }

    /* FAQ */
    .accordion-item {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
    }
    .accordion-title {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 300ms ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #060C1E;
      padding: 60px 24px;
      text-align: center;
      border-top: 1px solid var(--champagne-gold);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      padding: 60px 0 40px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 20px 0;
      text-align: center;
      color: var(--text-secondary);
      font-size: 12px;
    }

    input[type="email"] {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 8px;
      padding: 12px;
      color: white;
      width: 100%;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .masonry { columns: 2; }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .grid-3 { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .hero { flex-direction: column; }
      .floating-card { left: 0; bottom: -30px; }
      .footer-grid { grid-template-columns: 1fr; }
    }