/* roulang page: index */
:root {
      --bg-main: #070d19;
      --bg-surface: #0c1427;
      --bg-card: rgba(16, 26, 48, 0.68);
      --bg-card-hover: rgba(25, 41, 77, 0.85);
      --primary: #00e5ff;
      --primary-glow: 0 0 20px rgba(0, 229, 255, 0.45);
      --accent: #7c4dff;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --text-sub: #64748b;
      --border: 1px solid rgba(255, 255, 255, 0.08);
      --border-bright: 1px solid rgba(0, 229, 255, 0.35);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部微型条 + 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(7, 13, 25, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: var(--border);
    }

    .top-bar {
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
      font-size: 13px;
      color: var(--text-muted);
      padding: 6px 0;
    }

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

    .top-links a {
      margin-left: 18px;
      color: var(--text-muted);
    }
    .top-links a:hover {
      color: var(--primary);
    }

    .main-nav {
      padding: 16px 0;
    }

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

    .brand-logo {
      font-size: 20px;
      font-weight: 700;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

    .brand-logo span {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: var(--primary-glow);
    }

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

    .nav-menu a {
      font-size: 15px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }

    .btn-nav {
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(124, 77, 255, 0.25));
      border: 1px solid var(--primary);
      color: #fff;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: var(--primary-glow);
    }

    .btn-nav:hover {
      background: var(--primary);
      color: #070d19;
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.8);
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      min-height: 46px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00e5ff, #7c4dff);
      color: #050b14;
      border: none;
      box-shadow: 0 4px 20px rgba(0, 229, 255, 0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.03);
      color: #fff;
      border: 1px solid rgba(0, 229, 255, 0.5);
      backdrop-filter: blur(8px);
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.12);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* 通用板块排版 */
    section {
      padding: 90px 0;
      position: relative;
    }

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

    .section-header {
      margin-bottom: 50px;
      max-width: 820px;
    }

    .section-tag {
      display: inline-block;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 12px;
      padding: 4px 10px;
      background: rgba(0, 229, 255, 0.08);
      border-radius: var(--radius-sm);
      border-left: 2px solid var(--primary);
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块一：众筹预热式 Hero */
    .hero-crowd {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(124, 77, 255, 0.15), transparent 45%),
                  radial-gradient(circle at 10% 70%, rgba(0, 229, 255, 0.12), transparent 40%),
                  url('/assets/images/4a5e4ba0853f64e0.webp') center/cover no-repeat;
      position: relative;
    }
    
    .hero-crowd::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(7, 13, 25, 0.88);
    }

    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-intro h1 {
      font-size: 42px;
      line-height: 1.25;
      margin-bottom: 20px;
      font-weight: 800;
    }

    .hero-intro h1 span {
      color: var(--primary);
      text-shadow: var(--primary-glow);
    }

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

    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }

    /* 进度环与档位卡片 (预热蓝图结构) */
    .crowd-panel {
      background: var(--bg-card);
      border: var(--border-bright);
      border-radius: var(--radius-lg);
      padding: 32px;
      backdrop-filter: blur(16px);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }

    .crowd-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
    }

    .crowd-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      color: var(--primary);
    }

    .crowd-status-dot {
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 8px #10b981;
    }

    .ring-wrapper {
      display: flex;
      align-items: center;
      gap: 28px;
      margin-bottom: 28px;
    }

    .ring-visual {
      position: relative;
      width: 110px;
      height: 110px;
      flex-shrink: 0;
    }

    .ring-visual svg {
      transform: rotate(-90deg);
      width: 110px;
      height: 110px;
    }

    .ring-visual circle {
      fill: none;
      stroke-width: 8;
    }

    .ring-bg {
      stroke: rgba(255, 255, 255, 0.1);
    }

    .ring-prog {
      stroke: var(--primary);
      stroke-linecap: round;
      stroke-dasharray: 283;
      stroke-dashoffset: 42; /* ~85% */
      filter: drop-shadow(0 0 6px var(--primary));
    }

    .ring-text {
      position: absolute;
      inset: 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      color: #fff;
    }

    .ring-text span {
      font-size: 11px;
      color: var(--text-sub);
    }

    .ring-meta {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .ring-meta-item {
      font-size: 14px;
      color: var(--text-muted);
    }

    .ring-meta-item strong {
      color: #fff;
      font-size: 18px;
    }

    .tiers-preview {
      border-top: var(--border);
      padding-top: 20px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .tier-chip {
      background: rgba(255, 255, 255, 0.03);
      border: var(--border);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      font-size: 13px;
    }

    .tier-chip:hover {
      border-color: var(--primary);
    }

    /* 板块二：双栏资讯流 + 右侧热榜 */
    .stream-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
    }

    .feed-card {
      background: var(--bg-card);
      border: var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 20px;
      display: flex;
      gap: 20px;
      transition: all 0.3s ease;
    }

    .feed-card:hover {
      border-color: rgba(0, 229, 255, 0.4);
      background: var(--bg-card-hover);
      transform: translateY(-2px);
    }

    .feed-thumb {
      width: 140px;
      height: 95px;
      object-fit: cover;
      border-radius: var(--radius-sm);
      flex-shrink: 0;
    }

    .feed-body h3 {
      font-size: 17px;
      margin-bottom: 8px;
      color: #fff;
    }

    .feed-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .rank-box {
      background: var(--bg-surface);
      border: var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      position: sticky;
      top: 100px;
    }

    .rank-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: var(--border);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .rank-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .rank-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .rank-idx {
      width: 22px;
      height: 22px;
      background: rgba(255, 255, 255, 0.08);
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      font-weight: 700;
      color: var(--text-muted);
      flex-shrink: 0;
    }

    .rank-item:nth-child(1) .rank-idx {
      background: var(--primary);
      color: #000;
    }
    .rank-item:nth-child(2) .rank-idx {
      background: var(--accent);
      color: #fff;
    }

    .rank-item-info h4 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .rank-item-info span {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* 板块三：产品体系与精密参数 */
    .system-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .system-img-wrap {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: var(--border);
    }

    .system-metrics {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }

    .metric-card {
      background: var(--bg-card);
      border: var(--border);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
    }

    .metric-val {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }

    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块四：6大核心技术矩阵 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .glass-card {
      background: var(--bg-card);
      border: var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      backdrop-filter: blur(16px);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
      box-shadow: 0 10px 30px rgba(0, 229, 255, 0.15);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      background: rgba(0, 229, 255, 0.1);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 20px;
    }

    .glass-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: #fff;
    }

    .glass-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块五：3列热门设备展示带规格表 */
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      margin: 18px 0;
      font-size: 13px;
    }

    .spec-table td {
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .spec-table td:first-child {
      color: var(--text-sub);
    }

    .spec-table td:last-child {
      color: var(--text-main);
      text-align: right;
      font-weight: 500;
    }

    /* 板块六：深色流程时间轴 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .flow-step {
      background: rgba(255, 255, 255, 0.02);
      border: var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .flow-num {
      font-size: 36px;
      font-weight: 800;
      color: rgba(0, 229, 255, 0.2);
      line-height: 1;
      margin-bottom: 16px;
    }

    .flow-step h4 {
      font-size: 16px;
      margin-bottom: 8px;
      color: #fff;
    }

    .flow-step p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块七：4场景网格切换/平铺 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .scenario-box {
      background: var(--bg-card);
      border: var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

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

    .scenario-desc {
      padding: 24px;
    }

    .scenario-desc h3 {
      font-size: 18px;
      color: #fff;
      margin-bottom: 10px;
    }

    .scenario-desc p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块八：数据统计条 */
    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      background: linear-gradient(90deg, rgba(16, 26, 48, 0.8), rgba(25, 41, 77, 0.8));
      border: var(--border-bright);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    .stat-col {
      text-align: center;
      position: relative;
    }

    .stat-col:not(:last-child)::after {
      content: "";
      position: absolute;
      right: 0;
      top: 15%;
      height: 70%;
      width: 1px;
      background: rgba(255, 255, 255, 0.08);
    }

    .stat-digit {
      font-size: 40px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      font-feature-settings: "tnum";
    }

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

    /* 板块九：实测成效对比 */
    .contrast-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: var(--bg-card);
      border: var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
    }

    .contrast-pane {
      background: rgba(255, 255, 255, 0.02);
      padding: 24px;
      border-radius: var(--radius-sm);
      border: 1px dashed rgba(255, 255, 255, 0.1);
    }

    .contrast-pane.pro {
      border: 1px solid var(--primary);
      background: rgba(0, 229, 255, 0.04);
    }

    .contrast-pane h4 {
      font-size: 16px;
      margin-bottom: 16px;
      color: #fff;
    }

    .contrast-pane ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 板块十：评价墙 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testi-card {
      background: var(--bg-card);
      border: var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
    }

    .testi-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(0, 229, 255, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .author-info h5 {
      font-size: 14px;
      color: #fff;
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* 板块十一：FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-card);
      border: var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .faq-item.active {
      border-color: rgba(0, 229, 255, 0.4);
    }

    .faq-trigger {
      width: 100%;
      padding: 20px 24px;
      background: none;
      border: none;
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #fff;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
    }

    .faq-arrow {
      width: 20px;
      height: 20px;
      transition: transform 0.3s ease;
      fill: var(--text-muted);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      fill: var(--primary);
    }

    .faq-content {
      max-height: 0;
      overflow: hidden;
      opacity: 0;
      transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.35s ease;
      padding: 0 24px;
    }

    .faq-item.active .faq-content {
      max-height: 300px;
      opacity: 1;
      padding: 0 24px 20px;
    }

    .faq-content p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块十二：方案定制表单收口行动 */
    .cta-box {
      background: radial-gradient(circle at 50% 50%, rgba(124, 77, 255, 0.15), transparent 70%),
                  var(--bg-card);
      border: var(--border-bright);
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
      max-width: 960px;
      margin: 0 auto;
    }

    .cta-form {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr auto;
      gap: 16px;
      margin-top: 32px;
    }

    .form-control {
      background: rgba(7, 13, 25, 0.8);
      border: var(--border);
      border-radius: var(--radius-sm);
      padding: 14px 18px;
      color: #fff;
      font-size: 14px;
      outline: none;
      width: 100%;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
    }

    /* 页脚设计 */
    .site-footer {
      background: #030710;
      border-top: var(--border);
      padding: 80px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 60px;
    }

    .footer-col h4 {
      font-size: 16px;
      color: #fff;
      margin-bottom: 20px;
      font-weight: 600;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    .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;
      color: var(--text-sub);
    }

    /* 移动端菜单按钮与抽屉 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 24px;
      cursor: pointer;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid,
      .system-grid,
      .contrast-box,
      .stream-grid {
        grid-template-columns: 1fr;
      }
      .rank-box {
        position: static;
      }
      .cards-grid-3,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cta-form {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(7, 13, 25, 0.98);
        flex-direction: column;
        justify-content: flex-start;
        padding: 40px 24px;
        gap: 24px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
      }
      .nav-menu.open {
        transform: translateX(0);
      }
      .nav-menu a {
        font-size: 18px;
      }
      .cards-grid-3,
      .scenario-grid,
      .testimonials-grid,
      .stats-bar,
      .flow-steps {
        grid-template-columns: 1fr;
      }
      .stat-col:not(:last-child)::after {
        display: none;
      }
      .stat-col {
        margin-bottom: 20px;
      }
      .cta-form {
        grid-template-columns: 1fr;
      }
      .hero-intro h1 {
        font-size: 30px;
      }
      .hero-actions {
        flex-direction: column;
      }
      .ring-wrapper {
        flex-direction: column;
        text-align: center;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }