/* roulang page: index */
:root {
      --bg-base: #050814;
      --bg-alt: #0b132b;
      --surface: rgba(15, 23, 42, 0.75);
      --surface-hover: rgba(30, 41, 59, 0.85);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 242, 254, 0.45);
      --primary-cyan: #00f2fe;
      --primary-blue: #4facfe;
      --accent-purple: #9d4edd;
      --text-main: #ffffff;
      --text-muted: #94a3b8;
      --text-sub: #64748b;
      --glow-shadow: 0 0 25px rgba(0, 242, 254, 0.35);
      --card-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --max-width: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      line-height: 1.7;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 50% 0%, #101c44 0%, var(--bg-base) 65%);
    }

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航条 */
    .top-bar {
      background: rgba(5, 8, 20, 0.95);
      border-bottom: 1px solid var(--border-subtle);
      font-size: 13px;
      color: var(--text-muted);
      padding: 8px 0;
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10b981;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); opacity: 0.8; }
      50% { transform: scale(1.2); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.8; }
    }

    .header-main {
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(16px);
      background: rgba(5, 8, 20, 0.75);
      border-bottom: 1px solid var(--border-subtle);
      transition: all 0.3s;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: #fff;
    }

    .logo-cube {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 12px rgba(0, 242, 254, 0.5);
    }

    .logo-cube svg {
      width: 18px;
      height: 18px;
      fill: #050814;
    }

    .nav-menu {
      display: flex;
      gap: 28px;
      list-style: none;
    }

    .nav-link {
      font-size: 15px;
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
    }

    .nav-link:hover {
      color: var(--primary-cyan);
    }

    .btn-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
      color: #050814;
      cursor: pointer;
      border: none;
      box-shadow: var(--glow-shadow);
      transition: all 0.3s ease;
    }

    .btn-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 32px rgba(0, 242, 254, 0.6);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      color: #fff;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-outline:hover {
      border-color: var(--primary-cyan);
      color: var(--primary-cyan);
      background: rgba(0, 242, 254, 0.05);
    }

    /* 板块通用体系 */
    .section-wrap {
      padding: 96px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      margin-bottom: 56px;
      text-align: center;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 1px;
      text-transform: uppercase;
      border-radius: 20px;
      background: rgba(0, 242, 254, 0.1);
      color: var(--primary-cyan);
      border: 1px solid rgba(0, 242, 254, 0.2);
      margin-bottom: 16px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: #fff;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto;
      line-height: 1.8;
    }

    /* 1. Hero Bento */
    #hero {
      padding: 60px 0 90px;
      position: relative;
    }

    .bento-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr;
      grid-gap: 24px;
    }

    .bento-card {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 40px;
      backdrop-filter: blur(16px);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .bento-hero {
      background: linear-gradient(180deg, rgba(16, 28, 68, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%),
                  url('/assets/images/cbac98e1d5e77d93.png') center/cover no-repeat;
    }

    .hero-h1 {
      font-size: 40px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #ffffff 40%, var(--primary-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-text {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
    }

    .hero-cta-group {
      display: flex;
      gap: 16px;
      align-items: center;
    }

    .bento-right-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .tech-pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .tech-pill {
      font-size: 12px;
      padding: 6px 14px;
      border-radius: 6px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      color: var(--text-muted);
    }

    /* 2. 能力概览 */
    .grid-2col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-gap: 40px;
      align-items: center;
    }

    .feature-img-card {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      box-shadow: var(--card-shadow);
    }

    .spec-table {
      margin-top: 24px;
      border-top: 1px solid var(--border-subtle);
    }

    .spec-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-subtle);
      font-size: 14px;
    }

    .spec-label {
      color: var(--text-muted);
    }

    .spec-val {
      color: var(--primary-cyan);
      font-weight: 600;
    }

    /* 3. 核心优势六网格 */
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      grid-gap: 24px;
    }

    .advantage-card {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: all 0.3s;
    }

    .advantage-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
      box-shadow: var(--glow-shadow);
    }

    .adv-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(0, 242, 254, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-cyan);
      font-size: 20px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 4. 方案矩阵 */
    .product-tier-card {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 36px;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      backdrop-filter: blur(12px);
    }

    .tier-featured {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 30px rgba(0, 242, 254, 0.2);
    }

    .tier-badge {
      position: absolute;
      top: -12px;
      right: 28px;
      background: var(--accent-purple);
      color: #fff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 11px;
      font-weight: 700;
    }

    .tier-features {
      list-style: none;
      margin: 24px 0 32px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .tier-features li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .check-mark {
      color: var(--primary-cyan);
    }

    /* 5. 核心理念与架构拓扑 */
    .topology-container {
      background: rgba(5, 8, 20, 0.8);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 40px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      grid-gap: 32px;
      align-items: center;
    }

    /* 6. 成功案例与开发者故事 */
    .story-item {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      grid-gap: 36px;
      align-items: center;
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      overflow: hidden;
      margin-bottom: 32px;
    }

    .story-content {
      padding: 36px;
    }

    /* 7. 指标数据条 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      grid-gap: 24px;
      background: linear-gradient(90deg, rgba(16, 28, 68, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      text-align: center;
    }

    .metric-val {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary-cyan);
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 8. 真实口碑墙 */
    .quote-box {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }

    .avatar-mini {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #1e293b;
      border: 1px solid var(--primary-cyan);
    }

    /* 9. 动态与技术前沿资讯 */
    .news-card {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .news-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }

    .news-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .news-meta {
      font-size: 12px;
      color: var(--primary-cyan);
      margin-bottom: 8px;
    }

    /* 10. 交付流程时间线 */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      grid-gap: 20px;
      position: relative;
    }

    .timeline-step {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
    }

    .step-idx {
      font-size: 28px;
      font-weight: 800;
      color: rgba(255, 255, 255, 0.1);
      position: absolute;
      top: 16px;
      right: 20px;
    }

    /* 11. FAQ 手风琴 */
    .faq-wrapper {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .faq-item.active {
      border-color: var(--border-glow);
    }

    .faq-header {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 16px;
      font-weight: 600;
      color: #fff;
    }

    .faq-icon {
      transition: transform 0.3s;
      font-size: 18px;
      color: var(--primary-cyan);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-content {
      padding: 0 24px 20px;
      display: none;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
    }

    .faq-item.active .faq-content {
      display: block;
    }

    /* 12. 转化区与对接表单 */
    .cta-container {
      background: linear-gradient(135deg, rgba(16, 28, 68, 0.9) 0%, rgba(5, 8, 20, 0.95) 100%);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-gap: 48px;
      box-shadow: var(--glow-shadow);
      align-items: center;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 13px;
      margin-bottom: 8px;
      color: var(--text-muted);
    }

    .form-input, .form-select {
      width: 100%;
      padding: 12px 16px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      color: #fff;
      font-size: 14px;
      outline: none;
      transition: border-color 0.25s;
    }

    .form-input:focus, .form-select:focus {
      border-color: var(--primary-cyan);
    }

    .form-select option {
      background-color: var(--bg-alt);
      color: #fff;
    }

    /* 页脚 */
    .site-footer {
      background: #02040a;
      border-top: 1px solid var(--border-subtle);
      padding: 72px 0 32px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      grid-gap: 40px;
      margin-bottom: 48px;
    }

    .footer-title {
      color: #fff;
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .bento-grid { grid-template-columns: 1fr; }
      .grid-3col { grid-template-columns: repeat(2, 1fr); }
      .metrics-bar { grid-template-columns: repeat(2, 1fr); }
      .topology-container { grid-template-columns: 1fr; }
      .cta-container { grid-template-columns: 1fr; }
      .timeline-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-menu { display: none; }
      .grid-2col { grid-template-columns: 1fr; }
      .grid-3col { grid-template-columns: 1fr; }
      .timeline-grid { grid-template-columns: 1fr; }
      .metrics-bar { grid-template-columns: 1fr; }
      .story-item { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-h1 { font-size: 30px; }
      .section-title { font-size: 26px; }
      .section-wrap { padding: 60px 0; }
    }