/* roulang page: index */
:root {
      --primary: #6C22FF;
      --accent: #00F0FF;
      --bg-deep: #0A0A10;
      --surface: #13131F;
      --border-subtle: #2A2A3E;
      --text-body: #B0B0C0;
      --text-heading: #FFFFFF;
      --gradient-main: linear-gradient(135deg, #6C22FF 0%, #00F0FF 100%);
      --shadow-card: 0 4px 24px rgba(108, 34, 255, 0.08);
      --shadow-glow: 0 8px 40px rgba(0, 240, 255, 0.15);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "Rajdhani", sans-serif;
      --bs-body-bg: #0A0A10;
      --bs-body-color: #B0B0C0;
      --bs-primary: #6C22FF;
      --bs-border-radius: 16px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      margin: 0;
      line-height: 1.75;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-sans);
      color: var(--text-heading);
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: var(--accent);
      transition: color 0.2s;
    }
    a:hover {
      color: #fff;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .navbar {
      background: rgba(10, 10, 16, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(108, 34, 255, 0.2);
      transition: background 0.3s, box-shadow 0.3s;
      padding: 0.8rem 0;
    }
    .navbar.sticky-active {
      background: rgba(10, 10, 16, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .navbar-brand {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.8rem;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }
    .nav-link {
      color: #E0E0F0 !important;
      font-weight: 500;
      margin: 0 0.25rem;
      transition: color 0.2s;
      font-size: 1rem;
    }
    .nav-link:hover, .nav-link.active {
      color: #00F0FF !important;
    }
    .btn-primary-custom {
      background: var(--gradient-main);
      border: none;
      border-radius: var(--radius-pill);
      padding: 0.7rem 2rem;
      font-weight: 600;
      color: #fff;
      transition: all 0.3s;
      font-size: 0.95rem;
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      box-shadow: 0 0 20px rgba(108,34,255,0.5);
      color: #fff;
      transform: translateY(-1px);
    }
    .btn-outline-accent {
      background: transparent;
      border: 1px solid #00F0FF;
      color: #00F0FF;
      border-radius: var(--radius-pill);
      padding: 0.7rem 2rem;
      font-weight: 600;
      transition: all 0.3s;
      display: inline-block;
    }
    .btn-outline-accent:hover {
      background: #00F0FF;
      color: #0A0A10;
    }
    .navbar-toggler {
      border: 1px solid #2A2A3E;
      color: #fff;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 240, 255, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    /* 区块间距 */
    section {
      padding: 6rem 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 4rem 0;
      }
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60%;
      height: 3px;
      background: var(--gradient-main);
      border-radius: 2px;
    }
    /* Hero */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1A1030 0%, #0A0A10 70%);
      position: relative;
      overflow: hidden;
    }
    .hero-left h1 {
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-left .lead {
      font-size: 1.2rem;
      color: #B0B0C0;
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid #2A2A3E;
      background: #13131F;
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      display: block;
    }
    .hero-image-wrapper::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(108,34,255,0.25) 0%, rgba(0,240,255,0.1) 100%);
      pointer-events: none;
    }
    /* 数据徽章 */
    .badge-strip {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding: 1rem 0;
      flex-wrap: nowrap;
    }
    .stat-badge {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 1.5rem 2rem;
      min-width: 160px;
      text-align: center;
      flex-shrink: 0;
    }
    .stat-number {
      font-family: 'Rajdhani', sans-serif;
      font-weight: 700;
      font-size: 2.5rem;
      color: #00F0FF;
      line-height: 1.2;
    }
    /* 卡片通用 */
    .custom-card {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: all 0.3s;
      box-shadow: var(--shadow-card);
      height: 100%;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }
    .card-cover {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 1.25rem;
    }
    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 1.5rem;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
    }
    /* 方案对比 */
    .plan-card {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: 20px;
      padding: 2rem;
      position: relative;
    }
    .plan-highlight {
      border: 2px solid transparent;
      background-clip: padding-box;
      position: relative;
    }
    .plan-highlight::before {
      content: '';
      position: absolute;
      top: -2px; left: -2px; right: -2px; bottom: -2px;
      background: var(--gradient-main);
      border-radius: 20px;
      z-index: -1;
    }
    .badge-recommend {
      background: var(--gradient-main);
      color: #fff;
      border-radius: 20px;
      padding: 0.2rem 1rem;
      font-size: 0.8rem;
      font-weight: 600;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    /* FAQ */
    .accordion-button {
      background: #13131F;
      color: #fff;
      font-weight: 600;
      border: 1px solid #2A2A3E;
      border-radius: 12px !important;
      margin-bottom: 0.5rem;
    }
    .accordion-button:not(.collapsed) {
      background: #1E1E2F;
      color: #00F0FF;
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: 0 0 0 2px rgba(0,240,255,0.3);
      border-color: #00F0FF;
    }
    .accordion-body {
      background: #0F0F1A;
      border-radius: 0 0 12px 12px;
      color: #B0B0C0;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: #13131F;
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: repeating-linear-gradient(45deg, rgba(108,34,255,0.05) 0px, rgba(108,34,255,0.05) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }
    /* 页脚 */
    .footer-brand {
      font-size: 1.6rem;
      font-weight: 700;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .footer-link {
      color: #B0B0C0;
      transition: 0.2s;
    }
    .footer-link:hover {
      color: #00F0FF;
    }
    .tag-cloud .badge {
      background: #1E1E2F;
      border: 1px solid #2A2A3E;
      color: #B0B0C0;
      margin: 0.2rem;
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .hero-left {
        margin-bottom: 2rem;
      }
    }