/* roulang page: index */
:root {
      --bg-deep: #0A1628;
      --bg-card: rgba(26, 35, 50, 0.65);
      --primary: #1E90FF;
      --primary-glow: #00D2FF;
      --border-light: rgba(30, 144, 255, 0.25);
      --border-strong: rgba(0, 210, 255, 0.45);
      --text-body: #C8D6E5;
      --text-muted: #8A9BB5;
      --text-white: #ffffff;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --shadow-card: 0 12px 32px rgba(0, 210, 255, 0.10);
      --shadow-glow: 0 0 22px rgba(30, 144, 255, 0.5);
      --blur-glass: blur(14px);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-deep);
      font-family: var(--font-sans);
      color: var(--text-body);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      color: var(--text-white);
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s, border-color 0.2s;
    }

    a:hover {
      color: var(--primary-glow);
    }

    .container-custom {
      max-width: 1320px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 覆盖 Bootstrap 默认 */
    .btn {
      border-radius: 10px;
      font-weight: 500;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background: #1E90FF;
      border: none;
      box-shadow: 0 0 18px rgba(30,144,255,0.45);
      color: white;
    }
    .btn-primary:hover {
      background: #3AA2FF;
      box-shadow: 0 0 28px rgba(0,210,255,0.7);
      transform: translateY(-1px);
    }
    .btn-outline-primary {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline-primary:hover {
      background: rgba(30,144,255,0.15);
      border-color: var(--primary-glow);
      color: var(--primary-glow);
    }

    /* 玻璃卡片基础 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: var(--blur-glass);
      -webkit-backdrop-filter: var(--blur-glass);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .glass-card-dark {
      background: rgba(15, 25, 40, 0.7);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(30,144,255,0.2);
    }

    /* 浮动导航 dock */
    .navbar-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: min(720px, 90%);
      background: rgba(20, 30, 44, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(30,144,255,0.3);
      border-radius: 40px;
      padding: 10px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      box-shadow: 0 12px 28px rgba(0,0,0,0.5);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .navbar-dock.scrolled {
      background: rgba(10, 22, 40, 0.9);
      box-shadow: 0 14px 30px rgba(0,210,255,0.2);
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-logo i {
      color: var(--primary-glow);
      font-size: 1.6rem;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-weight: 500;
    }

    .nav-links a {
      color: #C8D6E5;
      font-size: 0.95rem;
      transition: 0.2s;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover, .nav-links a.active {
      color: white;
      border-bottom-color: var(--primary-glow);
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 0 16px rgba(30,144,255,0.6);
    }

    /* Hero 杂志双栏 */
    .hero-section {
      padding: 130px 0 100px;
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-left {
      flex: 0 0 58%;
    }
    .hero-right {
      flex: 0 0 38%;
    }

    .hero-h1 {
      font-size: 3.6rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0C7E0;
      margin-bottom: 2rem;
    }
    .stats-row {
      display: flex;
      gap: 30px;
      margin-top: 2.5rem;
    }
    .stat-item {
      text-align: left;
    }
    .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-glow);
    }

    .hero-card-img {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 35px rgba(0,210,255,0.3);
      border: 1px solid rgba(30,144,255,0.4);
    }

    /* 亮点网格 2宽1窄 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 2fr;
      gap: 24px;
      margin-top: 3rem;
    }

    .feature-card {
      background: var(--bg-card);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-light);
      border-radius: 24px;
      padding: 28px 24px;
      transition: all 0.25s ease;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-color: var(--border-strong);
      box-shadow: 0 16px 36px rgba(0,210,255,0.2);
    }
    .icon-glow {
      color: var(--primary-glow);
      font-size: 2rem;
      margin-bottom: 15px;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      columns: 4;
      column-gap: 24px;
      margin-top: 2.5rem;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border-radius: 22px;
      border: 1px solid rgba(30,144,255,0.2);
      overflow: hidden;
      transition: 0.2s;
    }
    .case-card:hover {
      border-color: var(--primary-glow);
      box-shadow: 0 0 28px rgba(0,210,255,0.3);
    }
    .case-img {
      width: 100%;
      display: block;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    /* 方案对比表 */
    .compare-table {
      display: flex;
      gap: 30px;
      margin-top: 2rem;
    }
    .compare-col {
      flex: 1;
      background: rgba(20, 32, 48, 0.7);
      backdrop-filter: blur(12px);
      border-radius: 28px;
      padding: 32px;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .compare-col.highlight {
      border-color: var(--primary-glow);
      box-shadow: 0 0 40px rgba(0,210,255,0.3);
      border-width: 1.5px;
    }

    /* FAQ */
    .accordion-faq .faq-item {
      background: rgba(26,35,50,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(30,144,255,0.2);
      border-radius: 18px;
      margin-bottom: 14px;
      padding: 0;
    }
    .faq-btn {
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      padding: 18px 22px;
      color: white;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .faq-dot {
      width: 12px;
      height: 12px;
      background: rgba(30,144,255,0.5);
      border-radius: 50%;
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: rgba(0,210,255,0.03);
      padding: 0 22px;
    }

    footer {
      background: #060F1A;
      border-top: 1px solid rgba(30,144,255,0.25);
      padding: 50px 0 25px;
    }

    @media (max-width: 992px) {
      .hero-section { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .masonry-grid { columns: 2; }
    }
    @media (max-width: 768px) {
      .navbar-dock { width: 95%; padding: 8px 18px; }
      .nav-links { gap: 15px; font-size: 0.8rem; }
      .hero-h1 { font-size: 2.4rem; }
      .compare-table { flex-direction: column; }
      .masonry-grid { columns: 1; }
    }