/* roulang page: index */
:root {
      --bg-deep: #0D0D0F;
      --gold: #D4A843;
      --gold-dark: #B8892E;
      --cyan: #00F0B5;
      --white: #FFFFFF;
      --gray-light: #E0E0E0;
      --gray-mid: #9A9A9A;
      --glass-bg: rgba(20, 20, 25, 0.6);
      --glass-border: rgba(212, 168, 67, 0.2);
      --glass-blur: blur(16px);
      --card-radius: 16px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --section-gap: 100px;
      --container-max: 1200px;
    }

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

    body {
      font-family: 'Inter', 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-deep);
      color: var(--gray-light);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease, border-color 0.25s ease;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 玻璃拟态卡片基类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(212, 168, 67, 0.5);
      transform: translateY(-4px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6);
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #D4A843, #B8892E);
      border: none;
      color: #0D0D0F;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 50px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      cursor: pointer;
      transition: all 0.3s ease;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 15px rgba(212,168,67,0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(212,168,67,0.7);
      transform: scale(1.03);
      color: #0D0D0F;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 50px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-outline:hover {
      background: rgba(212,168,67,0.15);
      border-color: #B8892E;
      color: #FFFFFF;
      box-shadow: 0 0 18px rgba(212,168,67,0.4);
    }

    /* 导航桌面 */
    .top-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(13,13,15,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 100;
      border-bottom: 1px solid rgba(212,168,67,0.15);
      padding: 0 20px;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      height: 70px;
    }

    .logo {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--gold);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 1.6rem;
      color: var(--cyan);
    }

    .desktop-links {
      display: flex;
      gap: 2.5rem;
    }
    .desktop-links a {
      color: var(--white);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 5px 0;
      transition: 0.2s;
    }
    .desktop-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width 0.25s ease;
    }
    .desktop-links a:hover {
      color: var(--gold);
    }
    .desktop-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--white);
    }

    /* 移动端底部Tab */
    .mobile-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #0D0D0F;
      border-top: 1px solid rgba(212,168,67,0.3);
      z-index: 99;
      padding: 8px 12px;
      justify-content: space-around;
    }
    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #9A9A9A;
      font-size: 0.7rem;
      transition: 0.2s;
    }
    .tab-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }
    .tab-item.active {
      color: var(--gold);
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 4rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-right img {
      border-radius: 32px;
      box-shadow: 0 20px 50px rgba(0,0,0,0.7);
      border: 1px solid rgba(212,168,67,0.25);
    }
    .hero-h1 {
      font-size: 3.6rem;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: #E0E0E0;
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: white;
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-desc {
      color: var(--gray-mid);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3rem;
    }

    /* 亮点网格 2+3 错落 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 2rem;
    }
    .highlight-card {
      text-align: center;
      padding: 32px 20px;
    }
    .highlight-icon {
      font-size: 2.5rem;
      color: var(--cyan);
      margin-bottom: 1.2rem;
    }

    /* 案例瀑布 */
    .cases-waterfall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card img {
      border-radius: 12px;
      aspect-ratio: 16/10;
      object-fit: cover;
      background: #1A1A1F;
    }
    .case-info {
      margin-top: 1rem;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .compare-col {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border-radius: 20px;
      padding: 28px 20px;
      border: 1px solid var(--glass-border);
      text-align: center;
    }
    .col-highlight {
      border: 2px solid var(--gold);
      box-shadow: 0 0 28px rgba(212,168,67,0.4);
      animation: pulseGlow 2.5s infinite;
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 18px rgba(212,168,67,0.3); }
      50% { box-shadow: 0 0 35px rgba(212,168,67,0.7); }
      100% { box-shadow: 0 0 18px rgba(212,168,67,0.3); }
    }

    /* FAQ */
    .accordion-title {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border-left: 4px solid var(--cyan);
      padding: 1.2rem;
      font-weight: 700;
      color: white;
    }
    .accordion-item.is-active .accordion-title {
      border-left-color: var(--gold);
      color: var(--gold);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2.5rem;
    }

    @media (max-width: 768px) {
      .desktop-links { display: none; }
      .hamburger { display: block; }
      .mobile-tab-bar { display: flex; }
      .hero-grid { flex-direction: column; }
      .highlights-grid { grid-template-columns: 1fr 1fr; }
      .cases-waterfall { grid-template-columns: 1fr; }
      .compare-table { grid-template-columns: 1fr; overflow-x: auto; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-h1 { font-size: 2.5rem; }
    }