/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-deep: #0A0E27;
      --accent-neon: #FF2D55;
      --accent-neon-hover: #E0284A;
      --bg-light: #F5F3FF;
      --card-bg: rgba(255, 255, 255, 0.92);
      --text-dark: #1A1A2E;
      --text-muted: #5A5A7A;
      --text-light: #F0F0FF;
      --border-light: rgba(10, 14, 39, 0.06);
      --shadow-light: 0 8px 30px rgba(10, 14, 39, 0.08);
      --shadow-dark: 0 12px 40px rgba(0, 0, 0, 0.4);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-data: 'Inter', 'SF Pro Display', sans-serif;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      padding-bottom: 80px; /* 移动端底部导航空间 */
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
    }

    h2 {
      font-size: 36px;
      line-height: 1.25;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
    }

    .section-title {
      position: relative;
      margin-bottom: 3rem;
    }

    .text-accent {
      color: var(--accent-neon);
    }

    .bg-deep {
      background-color: var(--primary-deep);
    }

    /* 容器自定义 */
    .custom-container {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮重置与定制 */
    .btn-primary-custom {
      background-color: var(--accent-neon);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--border-radius-sm);
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      font-family: var(--font-body);
      letter-spacing: 0.5px;
    }

    .btn-primary-custom:hover {
      background-color: var(--accent-neon-hover);
      transform: scale(1.03);
      box-shadow: 0 0 20px rgba(255, 45, 85, 0.4);
      color: white;
    }

    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--accent-neon);
      color: var(--accent-neon);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--border-radius-sm);
      transition: all var(--transition);
    }

    .btn-outline-custom:hover {
      background: rgba(255, 45, 85, 0.05);
      border-color: var(--accent-neon-hover);
      color: var(--accent-neon-hover);
    }

    .btn-light-custom {
      background: rgba(255,255,255,0.15);
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      font-weight: 500;
      padding: 10px 24px;
      border-radius: var(--border-radius-sm);
      transition: all var(--transition);
    }
    .btn-light-custom:hover {
      background: rgba(255,255,255,0.25);
      color: white;
    }

    /* 导航栏 */
    .navbar-custom {
      background: rgba(10, 14, 39, 0.92);
      backdrop-filter: blur(12px);
      padding: 12px 0;
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .navbar-brand {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: white !important;
      letter-spacing: 1px;
    }
    .navbar-brand i {
      color: var(--accent-neon);
      margin-right: 6px;
    }

    .nav-link-custom {
      color: rgba(255,255,255,0.75) !important;
      font-weight: 500;
      margin: 0 8px;
      padding: 8px 4px !important;
      border-bottom: 3px solid transparent;
      transition: all var(--transition);
    }
    .nav-link-custom:hover, .nav-link-custom.active {
      color: white !important;
      border-bottom-color: var(--accent-neon);
    }

    /* 移动端底部Tab导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: #0A0E27;
      border-top: 1px solid rgba(255,255,255,0.15);
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 999;
      backdrop-filter: blur(10px);
    }
    .mobile-tab {
      color: rgba(255,255,255,0.55);
      text-align: center;
      font-size: 12px;
      transition: color var(--transition);
      text-decoration: none;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .mobile-tab i {
      font-size: 20px;
      margin-bottom: 4px;
    }
    .mobile-tab.active {
      color: var(--accent-neon);
    }

    @media (min-width: 992px) {
      .mobile-bottom-nav {
        display: none;
      }
      body {
        padding-bottom: 0;
      }
    }

    /* Hero区域 */
    .hero-section {
      background: radial-gradient(circle at 20% 30%, #1A1F3A, #0A0E27);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      margin-top: 0;
      color: white;
    }
    .hero-grid-bg {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: linear-gradient(rgba(255,45,85,0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,45,85,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      opacity: 0.3;
    }
    .hero-image-wrapper {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(255,45,85,0.25);
      position: relative;
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      display: block;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 1.2rem;
    }
    .hero-text .lead {
      color: rgba(255,255,255,0.7);
      font-size: 18px;
    }

    /* 卡片样式 */
    .card-custom {
      background: var(--card-bg);
      backdrop-filter: blur(4px);
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-light);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: 0 20px 35px rgba(10,14,39,0.12);
    }

    .dark-card {
      background: rgba(26, 31, 58, 0.8);
      backdrop-filter: blur(8px);
      border: none;
      color: white;
      border-radius: var(--border-radius-md);
      padding: 24px;
      box-shadow: var(--shadow-dark);
    }

    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      display: inline-block;
      width: 100%;
    }

    /* 方案对比表 */
    .pricing-card {
      background: white;
      border-radius: var(--border-radius-lg);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-light);
      border: 1px solid var(--border-light);
      transition: all 0.3s;
    }
    .pricing-card.popular {
      border: 2px solid var(--accent-neon);
      transform: scale(1.02);
      position: relative;
    }
    .badge-hot {
      background: var(--accent-neon);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    /* FAQ手风琴定制 */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--accent-neon);
      box-shadow: none;
      font-weight: 700;
    }
    .accordion-button:focus {
      border-color: transparent;
      box-shadow: none;
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid rgba(10,14,39,0.1);
      background: transparent;
    }

    /* 页脚 */
    .footer-custom {
      background: #0A0E27;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .social-icon {
      display: inline-flex;
      width: 40px;
      height: 40px;
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: 50%;
      align-items: center;
      justify-content: center;
      color: white;
      margin-right: 10px;
      transition: all 0.3s;
    }
    .social-icon:hover {
      background: var(--accent-neon);
      border-color: var(--accent-neon);
      color: white;
    }

    @media (max-width: 992px) {
      h1 { font-size: 38px; }
      h2 { font-size: 28px; }
      .masonry-grid { column-count: 2; }
      .navbar-custom .nav-link-custom { display: none; }
      .navbar-custom .btn-primary-custom { padding: 8px 16px; font-size: 14px; }
    }
    @media (max-width: 768px) {
      .masonry-grid { column-count: 1; }
      .hero-section { padding: 120px 0 80px; }
      .card-custom { padding: 24px; }
    }