/* roulang page: index */
:root {
      --bg-deep: #060B19;
      --bg-surface: #0A122C;
      --primary-blue: #0066FF;
      --primary-cyan: #00D2FF;
      --accent-green: #00FF88;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --text-sub: #64748B;
      --glass-bg: rgba(15, 23, 42, 0.65);
      --glass-border: rgba(0, 210, 255, 0.15);
      --glass-hover-border: rgba(0, 210, 255, 0.45);
      --glow-blue: 0 0 25px rgba(0, 102, 255, 0.25);
      --radius-lg: 16px;
      --radius-md: 12px;
      --transition-base: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-deep);
      color: var(--text-muted);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(6, 11, 25, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--glass-border);
      padding: 14px 0;
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: 0.5px;
    }

    .brand-logo .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 16px;
      font-weight: 900;
      box-shadow: 0 0 12px rgba(0, 210, 255, 0.4);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .menu-trigger-btn {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--glass-border);
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 8px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      transition: var(--transition-base);
    }

    .menu-trigger-btn:hover {
      background: rgba(0, 210, 255, 0.15);
      border-color: var(--primary-cyan);
    }

    .menu-trigger-btn span.hamburger {
      width: 18px;
      height: 2px;
      background: var(--text-main);
      position: relative;
      display: inline-block;
    }
    .menu-trigger-btn span.hamburger::before,
    .menu-trigger-btn span.hamburger::after {
      content: '';
      position: absolute;
      width: 100%;
      height: 2px;
      background: var(--text-main);
      left: 0;
    }
    .menu-trigger-btn span.hamburger::before { top: -6px; }
    .menu-trigger-btn span.hamburger::after { bottom: -6px; }

    /* 全屏抽屉导航 Overlay */
    .drawer-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: rgba(6, 11, 25, 0.96);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 10000;
      display: none;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .drawer-overlay.active {
      display: flex;
      opacity: 1;
    }

    .drawer-close {
      position: absolute;
      top: 24px;
      right: 32px;
      font-size: 32px;
      color: var(--text-muted);
      cursor: pointer;
      line-height: 1;
      padding: 8px;
    }
    .drawer-close:hover { color: var(--primary-cyan); }

    .drawer-links {
      list-style: none;
      text-align: center;
      margin: 0;
    }

    .drawer-links li {
      margin: 18px 0;
    }

    .drawer-links a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-main);
      position: relative;
      padding-bottom: 6px;
    }

    .drawer-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--primary-blue), var(--primary-cyan));
      transition: var(--transition-base);
      transform: translateX(-50%);
    }

    .drawer-links a:hover {
      color: var(--primary-cyan);
    }
    .drawer-links a:hover::after {
      width: 100%;
    }

    /* 核心发光按钮与状态 */
    .btn-glow-primary {
      background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-cyan) 100%);
      color: #fff !important;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.45);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      cursor: pointer;
    }

    .btn-glow-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(0, 210, 255, 0.7);
    }

    .btn-outline-glass {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--glass-border);
      color: var(--text-main) !important;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 500;
      font-size: 14px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline-glass:hover {
      background: rgba(0, 210, 255, 0.12);
      border-color: var(--primary-cyan);
    }

    /* 基础板块通栏 */
    .biz-section {
      padding: 90px 0;
      position: relative;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }

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

    .section-head {
      margin-bottom: 46px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid rgba(0, 210, 255, 0.3);
      border-radius: 20px;
      color: var(--primary-cyan);
      font-size: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 12px;
    }

    .section-title {
      color: var(--text-main);
      font-size: 32px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 15px;
      max-width: 780px;
      line-height: 1.7;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: var(--transition-base);
      height: 100%;
      position: relative;
      overflow: hidden;
    }

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

    /* 板块 1: 首屏 Hero 无大图图标矩阵 + 状态条 */
    #hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: radial-gradient(circle at 50% 20%, rgba(0, 102, 255, 0.15) 0%, rgba(6, 11, 25, 0) 70%);
    }

    .hero-status-bar {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 6px 16px;
      background: rgba(0, 255, 136, 0.08);
      border: 1px solid rgba(0, 255, 136, 0.25);
      border-radius: 30px;
      margin-bottom: 24px;
      font-size: 13px;
      color: var(--accent-green);
    }

    .status-pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent-green);
      box-shadow: 0 0 8px var(--accent-green);
    }

    .hero-h1 {
      font-size: 42px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-lead-text {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.75;
      margin-bottom: 32px;
    }

    .hero-matrix-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 40px;
    }

    .matrix-item {
      background: rgba(15, 23, 42, 0.45);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 18px;
      display: flex;
      align-items: center;
      gap: 14px;
      transition: var(--transition-base);
    }

    .matrix-item:hover {
      border-color: var(--primary-cyan);
      background: rgba(15, 23, 42, 0.75);
    }

    .matrix-icon-box {
      width: 42px;
      height: 42px;
      background: rgba(0, 210, 255, 0.1);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-cyan);
      font-size: 18px;
      flex-shrink: 0;
    }

    .matrix-text h4 {
      font-size: 14px;
      color: var(--text-main);
      margin: 0 0 4px;
    }
    .matrix-text p {
      font-size: 12px;
      color: var(--text-sub);
      margin: 0;
    }

    /* 板块 2: 指标看板与算力矩阵 */
    .metric-value-huge {
      font-size: 44px;
      font-weight: 700;
      color: var(--accent-green);
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .metric-sub-label {
      font-size: 13px;
      color: var(--text-sub);
      margin-bottom: 12px;
    }

    .metric-sparkline-bar {
      height: 4px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 2px;
      overflow: hidden;
      margin-top: 14px;
    }
    .sparkline-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
    }

    /* 板块 3: 架构层级列表 */
    .arch-step-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .arch-step-item {
      display: flex;
      gap: 16px;
      padding: 16px;
      background: rgba(15, 23, 42, 0.5);
      border: 1px solid var(--glass-border);
      border-radius: 8px;
    }

    .arch-step-index {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary-cyan);
      background: rgba(0, 210, 255, 0.1);
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    /* 板块 5: 核心方案突出卡片 */
    .product-featured-card {
      border: 1px solid var(--accent-green) !important;
      box-shadow: 0 0 20px rgba(0, 255, 136, 0.15) !important;
      position: relative;
    }

    .product-top-badge {
      position: absolute;
      top: 14px;
      right: 14px;
      background: var(--accent-green);
      color: #060B19;
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
    }

    /* 板块 8: 对比表格卡片 */
    .comparison-box {
      border-radius: var(--radius-md);
      padding: 24px;
      height: 100%;
    }
    .comp-traditional {
      background: rgba(239, 68, 68, 0.04);
      border: 1px solid rgba(239, 68, 68, 0.2);
    }
    .comp-ai {
      background: rgba(0, 255, 136, 0.04);
      border: 1px solid rgba(0, 255, 136, 0.3);
    }

    .comp-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }

    /* 板块 9: 里程碑时间线 */
    .milestone-timeline {
      position: relative;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .milestone-timeline::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 10px;
      right: 10px;
      height: 2px;
      background: linear-gradient(90deg, var(--primary-blue), var(--primary-cyan), var(--accent-green));
      z-index: 1;
    }
    .milestone-node {
      position: relative;
      z-index: 2;
    }
    .milestone-dot {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--primary-cyan);
      box-shadow: 0 0 10px var(--primary-cyan);
      margin-bottom: 16px;
      border: 2px solid var(--bg-deep);
    }

    /* 板块 12: 折叠问答 */
    .faq-container {
      max-width: 880px;
      margin: 0 auto;
    }
    .faq-accordion-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question-btn {
      width: 100%;
      text-align: left;
      padding: 18px 20px;
      background: none;
      border: none;
      color: var(--text-main);
      font-size: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer-pane {
      padding: 0 20px 18px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 13: 接入表单 */
    .form-panel {
      background: rgba(15, 23, 42, 0.85);
      border: 1px solid rgba(0, 210, 255, 0.3);
      box-shadow: 0 0 35px rgba(0, 102, 255, 0.2);
      border-radius: var(--radius-lg);
      padding: 36px;
    }

    .form-input-control {
      width: 100%;
      background: rgba(6, 11, 25, 0.8) !important;
      border: 1px solid var(--glass-border) !important;
      border-radius: 6px !important;
      color: var(--text-main) !important;
      padding: 12px 14px !important;
      font-size: 14px !important;
      margin-bottom: 16px !important;
      height: auto !important;
    }
    .form-input-control:focus {
      border-color: var(--primary-cyan) !important;
      box-shadow: 0 0 10px rgba(0, 210, 255, 0.3) !important;
    }

    /* 页脚 */
    .site-footer {
      background-color: #030712;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 70px 0 30px;
      color: var(--text-sub);
      font-size: 13px;
    }

    .footer-brand h3 {
      color: var(--text-main);
      font-size: 18px;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer-col-title {
      color: var(--text-main);
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .footer-links-list {
      list-style: none;
      margin: 0;
    }
    .footer-links-list li {
      margin-bottom: 8px;
    }

    .footer-bottom-bar {
      margin-top: 50px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 响应式调整 */
    @media screen and (max-width: 1024px) {
      .hero-matrix-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .milestone-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .milestone-timeline::before {
        display: none;
      }
    }

    @media screen and (max-width: 640px) {
      .hero-h1 {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .hero-matrix-grid {
        grid-template-columns: 1fr;
      }
      .milestone-timeline {
        grid-template-columns: 1fr;
      }
      .metric-value-huge {
        font-size: 36px;
      }
      .biz-section {
        padding: 60px 0;
      }
    }