/* roulang page: index */
:root {
      --bs-body-font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --bs-body-bg: #0B0C10;
      --bs-body-color: #B0B3C1;
      --primary: #7B2FF7;
      --primary-hover: #9D4EDD;
      --secondary: #A7F33D;
      --dark-bg: #0B0C10;
      --card-bg: #1A1B23;
      --light-bg: #F4F5F7;
      --text-muted: #6B6E7B;
      --border-light: rgba(255, 255, 255, 0.08);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-badge: 30px;
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.25);
      --shadow-hover: 0 12px 32px rgba(123, 47, 247, 0.3);
      --transition: 0.25s ease;
    }
    body {
      background-color: var(--dark-bg);
      color: var(--bs-body-color);
      line-height: 1.6;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      color: #FFFFFF;
      font-weight: 600;
    }
    a {
      color: var(--primary);
      text-decoration: none;
    }
    .container-custom {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      padding: 12px 0;
    }
    .navbar-brand {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, #7B2FF7, #9D4EDD);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-link {
      color: #B0B3C1 !important;
      font-weight: 500;
      margin: 0 4px;
      padding: 8px 16px !important;
      border-radius: 8px;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: #FFFFFF !important;
      background: rgba(123, 47, 247, 0.15);
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, #7B2FF7, #9D4EDD);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(123, 47, 247, 0.4);
    }
    .btn-primary-custom:hover {
      background: linear-gradient(135deg, #9D4EDD, #7B2FF7);
      box-shadow: 0 6px 18px rgba(123, 47, 247, 0.6);
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid #7B2FF7;
      color: #FFFFFF;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: #7B2FF7;
      color: white;
      border-color: #7B2FF7;
    }
    /* 区块间距 */
    section {
      padding: 90px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container-custom {
        padding: 0 16px;
      }
    }
    /* 卡片 */
    .card-custom {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .badge-custom {
      background: rgba(167, 243, 61, 0.15);
      color: #A7F33D;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: var(--radius-badge);
      font-size: 0.8rem;
    }
    .data-badge {
      background: linear-gradient(135deg, #7B2FF7, #9D4EDD);
      color: white;
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 12px rgba(123, 47, 247, 0.4);
    }
    /* Hero */
    .hero-background {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      background: rgba(11, 12, 16, 0.75);
      backdrop-filter: blur(4px);
    }
    .floating-badge {
      background: rgba(26, 27, 35, 0.9);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(123, 47, 247, 0.4);
      border-radius: 30px;
      padding: 10px 20px;
      color: white;
      font-weight: 600;
    }
    /* 优势卡片高度不一 */
    .advantage-card-tall {
      min-height: 300px;
    }
    .advantage-card-normal {
      min-height: 260px;
    }
    /* 产品瀑布流模拟 */
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
    }
    .product-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 20px 20px 0 0;
    }
    /* 对比表 */
    .plan-col {
      background: var(--card-bg);
      border-radius: 20px;
      padding: 24px;
      border: 1px solid var(--border-light);
    }
    .plan-featured {
      background: rgba(123, 47, 247, 0.12);
      border: 2px solid #7B2FF7;
    }
    /* FAQ */
    .accordion-button {
      background: transparent;
      color: #FFFFFF;
      font-weight: 600;
      border: none;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(123, 47, 247, 0.1);
      color: #FFFFFF;
      border-left: 4px solid #7B2FF7;
    }
    .accordion-item {
      background: transparent;
      border: 1px solid var(--border-light);
      border-radius: 16px !important;
      margin-bottom: 16px;
    }
    /* 表单 */
    .form-control {
      background: #1A1B23;
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
      border-radius: 10px;
      padding: 12px 16px;
    }
    .form-control:focus {
      border-color: #7B2FF7;
      box-shadow: 0 0 0 0.2rem rgba(123, 47, 247, 0.3);
      background: #1A1B23;
      color: white;
    }
    footer {
      background: #0B0C10;
      border-top: 1px solid var(--border-light);
    }