/* roulang page: index */
:root {
      --bg-deep: #060b17;
      --bg-surface: #0d172e;
      --bg-card: rgba(13, 23, 46, 0.75);
      --bg-glass: rgba(16, 29, 58, 0.6);
      --primary-blue: #1a66ff;
      --accent-cyan: #00d2ff;
      --glow-blue: rgba(0, 210, 255, 0.35);
      --border-cyan: rgba(0, 210, 255, 0.18);
      --border-light: rgba(255, 255, 255, 0.08);
      --text-bright: #f8fafc;
      --text-body: #94a3b8;
      --text-dim: #64748b;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --radius-full: 9999px;
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      --font-stack: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-stack);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-md);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* Top Strip */
    .top-strip {
      background: rgba(6, 11, 23, 0.95);
      border-bottom: 1px solid var(--border-light);
      font-size: 0.8125rem;
      color: var(--text-dim);
      padding: 8px 0;
    }
    .top-strip-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .top-strip-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
      display: inline-block;
    }

    /* Header Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(6, 11, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-cyan);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .brand-logo {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-bright);
      letter-spacing: -0.5px;
    }
    .brand-logo-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      box-shadow: 0 0 16px var(--glow-blue);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      color: var(--text-body);
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
    }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      background: linear-gradient(90deg, var(--primary-blue), #00b4d8);
      color: #fff;
      font-size: 0.9375rem;
      font-weight: 600;
      box-shadow: 0 0 18px var(--glow-blue);
      border: 1px solid rgba(255, 255, 255, 0.2);
      cursor: pointer;
    }
    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 28px rgba(0, 210, 255, 0.6);
      color: #fff;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-cyan);
      color: var(--text-bright);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1rem;
    }

    /* Section Global Styles */
    section {
      padding: 86px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-surface);
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }
    .section-header {
      max-width: 780px;
      margin: 0 auto 52px auto;
      text-align: center;
    }
    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.8125rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--accent-cyan);
      background: rgba(0, 210, 255, 0.08);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-full);
      margin-bottom: 16px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-bright);
      line-height: 1.35;
      margin-bottom: 18px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-body);
      line-height: 1.75;
    }

    /* Glass Cards */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 210, 255, 0.15);
    }

    /* Hero Section (Blueprint: 新品发布，倒计时环 + 卖点要点 + 预约购买) */
    .hero-section {
      padding: 96px 0 80px;
      background: radial-gradient(circle at 50% 20%, rgba(26, 102, 255, 0.18) 0%, rgba(6, 11, 23, 0) 70%), url('/assets/images/fcbed6257589ce3d.webp') center/cover no-repeat;
      position: relative;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(6, 11, 23, 0.86);
      backdrop-filter: blur(4px);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-full);
      color: var(--accent-cyan);
      font-size: 0.875rem;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 2.85rem;
      line-height: 1.25;
      color: var(--text-bright);
      margin-bottom: 22px;
      font-weight: 800;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: #cbd5e1;
      margin-bottom: 32px;
      line-height: 1.8;
    }
    .hero-bullets {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 36px;
    }
    .bullet-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      background: rgba(13, 23, 46, 0.5);
      border: 1px solid var(--border-light);
      padding: 12px 16px;
      border-radius: var(--radius-md);
    }
    .bullet-icon {
      color: var(--accent-cyan);
      font-size: 1.1rem;
      line-height: 1.2;
    }
    .bullet-text strong {
      display: block;
      color: var(--text-bright);
      font-size: 0.95rem;
    }
    .bullet-text span {
      font-size: 0.8125rem;
      color: var(--text-dim);
    }
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-neon-primary {
      padding: 15px 36px;
      background: linear-gradient(100deg, var(--primary-blue), #00b4d8);
      border: 1px solid rgba(255, 255, 255, 0.3);
      border-radius: var(--radius-full);
      color: #fff;
      font-weight: 700;
      font-size: 1.05rem;
      box-shadow: 0 0 25px rgba(0, 210, 255, 0.45);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }
    .btn-neon-primary:hover {
      box-shadow: 0 0 35px rgba(0, 210, 255, 0.7);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-neon-secondary {
      padding: 15px 32px;
      background: rgba(13, 23, 46, 0.85);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-full);
      color: var(--accent-cyan);
      font-weight: 600;
      font-size: 1.025rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-neon-secondary:hover {
      background: rgba(0, 210, 255, 0.1);
      color: #fff;
    }

    /* Release Countdown Card */
    .release-card {
      background: rgba(13, 23, 46, 0.85);
      backdrop-filter: blur(24px);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      text-align: center;
      box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
    }
    .release-status-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(0, 210, 255, 0.12);
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      border-radius: var(--radius-full);
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 18px;
    }
    .countdown-ring-box {
      margin: 20px auto;
      display: flex;
      justify-content: center;
      gap: 16px;
    }
    .timer-unit {
      background: rgba(6, 11, 23, 0.9);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 12px 14px;
      min-width: 68px;
    }
    .timer-unit .timer-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--text-bright);
      line-height: 1.1;
      font-family: monospace;
    }
    .timer-unit .timer-label {
      font-size: 0.75rem;
      color: var(--text-dim);
      margin-top: 4px;
    }
    .release-meta-info {
      font-size: 0.875rem;
      color: var(--text-body);
      margin: 20px 0;
      line-height: 1.6;
    }
    .form-inline-reserve {
      display: flex;
      gap: 10px;
      margin-top: 20px;
    }
    .input-glass {
      flex: 1;
      padding: 12px 16px;
      background: rgba(6, 11, 23, 0.7);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-md);
      color: var(--text-bright);
      font-size: 0.9375rem;
      outline: none;
    }
    .input-glass:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 12px var(--glow-blue);
    }

    /* Section 2: 品类入口 (Category Grid) */
    .category-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .category-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      transition: var(--transition);
    }
    .category-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
    }
    .category-icon-box {
      width: 56px;
      height: 56px;
      margin: 0 auto 16px;
      border-radius: 14px;
      background: rgba(0, 210, 255, 0.08);
      border: 1px solid var(--border-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      color: var(--accent-cyan);
    }
    .category-title {
      color: var(--text-bright);
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .category-desc {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* Section 3: 技术架构与实证参数 */
    .tech-arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .tech-metrics-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .metric-capsule {
      background: var(--bg-card);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .metric-data-val {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--accent-cyan);
      font-family: monospace;
    }

    /* Section 4: 附近推荐 / 本地化智能节点 */
    .nodes-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .node-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }
    .node-latency {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 0.8125rem;
      padding: 4px 10px;
      border-radius: var(--radius-full);
      background: rgba(16, 185, 129, 0.1);
      color: #10b981;
      border: 1px solid rgba(16, 185, 129, 0.3);
    }

    /* Section 5: 核心功能矩阵 (6卡片) */
    .features-matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-box {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      transition: var(--transition);
    }
    .feature-box:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
      box-shadow: 0 10px 30px rgba(0, 210, 255, 0.12);
    }
    .feature-box-title {
      font-size: 1.25rem;
      color: var(--text-bright);
      margin-bottom: 12px;
      font-weight: 700;
    }

    /* Section 6: 认知重塑理念 */
    .philosophy-banner {
      background: radial-gradient(circle at 50% 50%, rgba(26, 102, 255, 0.15) 0%, rgba(6, 11, 23, 0.85) 100%);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-lg);
      padding: 56px 40px;
      text-align: center;
    }
    .steps-chain {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
      text-align: left;
    }
    .step-item-card {
      background: rgba(6, 11, 23, 0.8);
      border: 1px solid var(--border-light);
      padding: 24px;
      border-radius: var(--radius-md);
      position: relative;
    }
    .step-badge {
      font-size: 0.8125rem;
      color: var(--accent-cyan);
      font-weight: 700;
      margin-bottom: 8px;
    }

    /* Section 7: 口碑榜与学情实测 */
    .reviews-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .review-user-info {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .user-avatar-circle {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-blue), #38bdf8);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
    }

    /* Section 8: 试用权益与资格申请 */
    .trial-box-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .perks-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .perk-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
    }
    .perk-check {
      color: var(--accent-cyan);
      font-weight: 800;
    }

    /* Section 9: 保障承诺与隐私合规 */
    .guarantee-badges {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-pill {
      background: var(--bg-card);
      border: 1px solid var(--border-cyan);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      text-align: center;
    }

    /* Section 10: 到店/接入流程 */
    .onboarding-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .process-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      padding: 28px 20px;
      border-radius: var(--radius-md);
      text-align: center;
      position: relative;
    }
    .process-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      margin: 0 auto 16px auto;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    /* Section 11: 资讯与学术洞察 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card-img-wrap {
      margin-bottom: 20px;
      overflow: hidden;
      border-radius: var(--radius-md);
    }
    .news-card-img-wrap img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: var(--transition);
    }
    .news-card:hover .news-card-img-wrap img {
      transform: scale(1.05);
    }

    /* Section 12: 最终预约与收口行动区 */
    .final-cta-section {
      padding: 90px 0;
      background: radial-gradient(circle at 50% 50%, rgba(26, 102, 255, 0.22) 0%, rgba(6, 11, 23, 0.95) 75%), url('/assets/images/4a6d9f2683373eb1.webp') center/cover no-repeat;
      position: relative;
    }
    .final-cta-card {
      max-width: 860px;
      margin: 0 auto;
      background: rgba(13, 23, 46, 0.88);
      border: 1px solid var(--accent-cyan);
      box-shadow: 0 0 50px rgba(0, 210, 255, 0.2);
      border-radius: var(--radius-lg);
      padding: 56px 40px;
      text-align: center;
    }

    /* Footer */
    .site-footer {
      background: #030712;
      border-top: 1px solid var(--border-light);
      padding: 72px 0 32px;
      color: var(--text-dim);
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 56px;
    }
    .footer-brand-desc {
      margin-top: 16px;
      line-height: 1.7;
      max-width: 320px;
    }
    .footer-col-title {
      font-size: 1rem;
      color: var(--text-bright);
      font-weight: 600;
      margin-bottom: 20px;
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links-list a:hover {
      color: var(--accent-cyan);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
      }
      .category-grid, .guarantee-badges, .onboarding-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .features-matrix, .nodes-grid, .reviews-masonry, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-arch-grid, .trial-box-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: rgba(6, 11, 23, 0.98);
        border-bottom: 1px solid var(--border-cyan);
        flex-direction: column;
        padding: 24px;
        gap: 18px;
      }
      .nav-links.mobile-open {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2.15rem;
      }
      .hero-bullets {
        grid-template-columns: 1fr;
      }
      .category-grid, .features-matrix, .nodes-grid, .reviews-masonry, .news-grid, .steps-chain, .guarantee-badges, .onboarding-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      .form-inline-reserve {
        flex-direction: column;
      }
    }