/* roulang page: index */
:root {
      --bg-dark: #141721;
      --bg-deep: #0b0c10;
      --bg-light: #f5f7fa;
      --bg-card: #1c2130;
      --bg-card-light: #ffffff;
      --primary-cyan: #00e5a3;
      --primary-hover: #00c78e;
      --secondary-blue: #2b6cb0;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --text-white: #f8fafc;
      --text-white-dim: #94a3b8;
      --border-dark: rgba(255, 255, 255, 0.08);
      --border-light: rgba(0, 0, 0, 0.08);
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.06);
      --shadow-glow: 0 8px 30px rgba(0, 229, 163, 0.15);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * { box-sizing: border-box; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a { text-decoration: none; color: inherit; transition: var(--transition); }
    h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; margin-bottom: 0.75rem; letter-spacing: -0.02em; }
    p { margin-bottom: 1rem; }
    img { max-width: 100%; height: auto; display: block; }

    /* Top Sub-Header */
    .top-meta-bar {
      background: #0d0f15;
      color: #718096;
      font-size: 0.82rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      padding: 6px 0;
    }
    .top-meta-bar .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #a0aec0;
    }
    .status-dot {
      width: 7px;
      height: 7px;
      background: var(--primary-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-cyan);
    }

    /* Main Segmented Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(20, 23, 33, 0.95);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-dark);
      padding: 12px 0;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.18rem;
      font-weight: 800;
      color: var(--text-white);
    }
    .nav-brand i {
      color: var(--primary-cyan);
      font-size: 1.35rem;
    }

    /* Segmented Navigation Chips */
    .nav-chips {
      display: inline-flex;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px;
      border-radius: 30px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      gap: 2px;
    }
    .nav-chip-link {
      padding: 6px 16px;
      border-radius: 20px;
      color: #94a3b8;
      font-size: 0.88rem;
      font-weight: 600;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-chip-link:hover, .nav-chip-link.active {
      color: #0b0c10;
      background: var(--primary-cyan);
    }

    /* Primary CTA Buttons */
    .btn-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--primary-cyan);
      color: #0b0c10;
      font-weight: 700;
      font-size: 0.92rem;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--primary-cyan);
      cursor: pointer;
      transition: var(--transition);
      min-height: 44px;
    }
    .btn-action:hover {
      background: var(--primary-hover);
      color: #050608;
      transform: translateY(-2px);
      box-shadow: var(--shadow-glow);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: transparent;
      color: var(--text-white);
      font-weight: 600;
      font-size: 0.92rem;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      cursor: pointer;
      transition: var(--transition);
      min-height: 44px;
    }
    .btn-outline:hover {
      border-color: var(--primary-cyan);
      color: var(--primary-cyan);
      background: rgba(0, 229, 163, 0.05);
      transform: translateY(-2px);
    }

    /* Section Global Styles */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-white);
    }
    .section-deep {
      background-color: var(--bg-deep);
      color: var(--text-white);
    }
    .section-light {
      background-color: var(--bg-light);
      color: var(--text-main);
    }
    .section-white {
      background-color: #ffffff;
      color: var(--text-main);
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.78rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary-cyan);
      background: rgba(0, 229, 163, 0.1);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      border: 1px solid rgba(0, 229, 163, 0.2);
    }
    .section-header h2 {
      font-size: 2.2rem;
      margin-bottom: 14px;
    }
    .section-header p {
      max-width: 740px;
      margin: 0 auto;
      color: var(--text-muted);
      font-size: 1.05rem;
    }
    .section-dark .section-header p, .section-deep .section-header p {
      color: var(--text-white-dim);
    }

    /* 板块一：Hero Banner */
    .hero-banner {
      background: linear-gradient(135deg, rgba(11,12,16,0.92) 0%, rgba(20,23,33,0.95) 100%),
                  url('/assets/images/2db97fc5fbc06e6a.webp') center/cover no-repeat;
      padding: 110px 0 100px;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-title {
      font-size: 3.1rem;
      color: var(--text-white);
      margin-bottom: 20px;
      font-weight: 800;
      letter-spacing: -0.03em;
    }
    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-white-dim);
      margin-bottom: 34px;
      line-height: 1.75;
      max-width: 620px;
    }
    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 36px;
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .hero-badge-item {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-white-dim);
      font-size: 0.85rem;
    }
    .hero-badge-item i {
      color: var(--primary-cyan);
    }
    .hero-visual-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-dark);
      padding: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    .hero-visual-card img {
      border-radius: var(--radius-sm);
      width: 100%;
      object-fit: cover;
      max-height: 420px;
    }

    /* 板块二：产品概览 */
    .spec-item {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }
    .spec-icon {
      width: 44px;
      height: 44px;
      background: rgba(0, 229, 163, 0.08);
      color: var(--primary-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 1.2rem;
      flex-shrink: 0;
      border: 1px solid rgba(0, 229, 163, 0.2);
    }

    /* 板块三：核心技术优势 (6卡网格) */
    .adv-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 30px 24px;
      border-radius: var(--radius-md);
      transition: var(--transition);
      height: 100%;
      margin-bottom: 24px;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-sm);
      border-color: var(--secondary-blue);
    }
    .adv-icon-box {
      width: 50px;
      height: 50px;
      background: #f0f4f9;
      color: var(--secondary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 1.35rem;
      margin-bottom: 18px;
    }
    .adv-card h4 { font-size: 1.18rem; margin-bottom: 10px; }
    .adv-card p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; }

    /* 板块四：热门套件 (3方案对比) */
    .suite-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      height: 100%;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
      margin-bottom: 24px;
    }
    .suite-card.highlight {
      border-color: var(--primary-cyan);
      box-shadow: 0 10px 30px rgba(0, 229, 163, 0.12);
    }
    .suite-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary-cyan);
      color: #0b0c10;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 12px;
    }
    .suite-card h3 { color: var(--text-white); font-size: 1.35rem; margin-bottom: 12px; }
    .suite-card .suite-desc { color: var(--text-white-dim); font-size: 0.92rem; margin-bottom: 24px; }
    .suite-list { list-style: none; margin: 0 0 30px 0; padding: 0; flex-grow: 1; }
    .suite-list li {
      color: #cbd5e1;
      font-size: 0.88rem;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .suite-list li i { color: var(--primary-cyan); font-size: 0.85rem; }

    /* 板块五：场景演示 */
    .scenario-block {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 30px;
    }
    .scenario-content {
      padding: 40px;
    }
    .scenario-img-wrap {
      height: 100%;
      min-height: 280px;
      background: #e2e8f0;
    }
    .scenario-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 板块六：深色沉浸安全体系 */
    .security-matrix {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }
    .security-box {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dark);
      padding: 26px;
      border-radius: var(--radius-sm);
    }
    .security-box i { font-size: 1.8rem; color: var(--primary-cyan); margin-bottom: 14px; }
    .security-box h4 { color: var(--text-white); font-size: 1.1rem; }
    .security-box p { color: var(--text-white-dim); font-size: 0.88rem; margin-bottom: 0; }

    /* 板块七：成功故事 */
    .story-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .story-info { padding: 40px; }
    .story-metrics-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px solid var(--border-light);
    }
    .metric-unit-val { font-size: 1.8rem; font-weight: 800; color: var(--secondary-blue); }
    .metric-unit-lbl { font-size: 0.82rem; color: var(--text-muted); }

    /* 板块八：指标条 */
    .metrics-ribbon {
      background: #0f131c;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
      padding: 50px 0;
    }
    .metric-col {
      text-align: center;
      border-right: 1px solid rgba(255, 255, 255, 0.06);
    }
    .metric-col:last-child { border-right: none; }
    .metric-huge {
      font-size: 2.7rem;
      font-weight: 800;
      color: var(--primary-cyan);
      line-height: 1;
      margin-bottom: 8px;
      font-family: monospace, sans-serif;
    }
    .metric-title { font-size: 0.9rem; color: var(--text-white-dim); letter-spacing: 0.02em; }

    /* 板块九：行业专家评价 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 32px 28px;
      border-radius: var(--radius-md);
      height: 100%;
      margin-bottom: 20px;
      position: relative;
    }
    .review-text { font-size: 0.95rem; color: #475569; font-style: italic; margin-bottom: 24px; }
    .review-author { display: flex; align-items: center; gap: 14px; }
    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #cbd5e1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #334155;
    }
    .review-meta h5 { font-size: 0.95rem; margin-bottom: 2px; }
    .review-meta span { font-size: 0.78rem; color: var(--text-muted); }

    /* 板块十：前沿动态与指南 */
    .news-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 100%;
      margin-bottom: 20px;
      transition: var(--transition);
    }
    .news-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }
    .news-cover { height: 180px; overflow: hidden; }
    .news-cover img { width: 100%; height: 100%; object-fit: cover; }
    .news-body { padding: 22px; }
    .news-meta-date { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 8px; display: block; }
    .news-body h4 { font-size: 1.1rem; margin-bottom: 10px; }
    .news-body p { font-size: 0.88rem; color: var(--text-muted); }

    /* 板块十一：技术 FAQ */
    .accordion {
      background: transparent;
      border: none;
    }
    .accordion-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      padding: 18px 24px;
      border: none;
      transition: var(--transition);
    }
    .accordion-title:hover {
      background: #f8fafc;
      color: var(--secondary-blue);
    }
    .is-active > .accordion-title {
      background: #f1f5f9;
      color: var(--secondary-blue);
    }
    .accordion-content {
      padding: 18px 24px;
      border: none;
      color: #475569;
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* 板块十二：保障条 */
    .guarantee-bar {
      background: #141721;
      padding: 40px 0;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 14px;
      color: var(--text-white);
    }
    .guarantee-item i {
      font-size: 2rem;
      color: var(--primary-cyan);
    }
    .guarantee-item h5 { font-size: 0.98rem; margin-bottom: 2px; }
    .guarantee-item p { font-size: 0.8rem; color: var(--text-white-dim); margin-bottom: 0; }

    /* 板块十三：收口行动与咨询表单 */
    .cta-box {
      background: linear-gradient(135deg, #181d2a 0%, #0d1017 100%);
      border: 1px solid rgba(0, 229, 163, 0.25);
      border-radius: var(--radius-md);
      padding: 50px 40px;
      box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    }
    .form-input-dark {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #ffffff;
      height: 46px;
      border-radius: var(--radius-sm);
      padding: 0 14px;
      margin-bottom: 16px;
    }
    .form-input-dark:focus {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--primary-cyan);
      box-shadow: 0 0 8px rgba(0, 229, 163, 0.3);
      color: #ffffff;
    }
    select.form-input-dark option {
      background: #141721;
      color: #ffffff;
    }

    /* 页脚 Footer */
    .site-footer {
      background: #090a0d;
      color: #64748b;
      padding: 70px 0 30px;
      font-size: 0.88rem;
      border-top: 1px solid var(--border-dark);
    }
    .footer-heading {
      color: var(--text-white);
      font-size: 1rem;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-links { list-style: none; margin: 0; padding: 0; }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a:hover { color: var(--primary-cyan); }
    .footer-bottom {
      margin-top: 50px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.8rem;
    }

    /* 浮动常驻条 */
    .sticky-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(11, 12, 16, 0.95);
      backdrop-filter: blur(10px);
      border-top: 1px solid var(--primary-cyan);
      padding: 10px 0;
      z-index: 998;
      transform: translateY(100%);
      transition: transform 0.3s ease;
    }
    .sticky-bottom-bar.is-visible {
      transform: translateY(0);
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.4rem; }
      .nav-chips { display: none; }
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 2rem; }
      section { padding: 60px 0; }
      .metric-col { border-right: none; margin-bottom: 24px; }
      .cta-box { padding: 30px 20px; }
      .top-meta-bar { display: none; }
    }