/* roulang page: index */
:root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --accent: #f59e0b;
      --accent-hover: #d97706;
      --bg-body: #f8fafc;
      --bg-surface: #ffffff;
      --bg-dark: #0f172a;
      --bg-deep: #090d16;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #94a3b8;
      --border-color: #e2e8f0;
      --border-dark: #1e293b;
      --radius: 8px;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
      --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.25);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; margin: 0; padding: 0; }

    /* Top Utility Bar */
    .top-utility-bar {
      background: var(--bg-deep);
      color: var(--text-light);
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.4rem 0;
    }
    .top-utility-bar .utility-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .utility-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      margin-right: 1.25rem;
    }
    .utility-tag i { color: var(--accent); }

    /* Main Sticky Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      box-shadow: var(--shadow-sm);
      border-bottom: 1px solid var(--border-color);
      height: 70px;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
    }
    .brand-logo .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), #024e75);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      box-shadow: 0 2px 8px rgba(2, 132, 199, 0.4);
    }
    .brand-logo span { color: var(--primary); }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .nav-menu a {
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 0.5rem 0.25rem;
      position: relative;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.65rem 1.4rem;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      gap: 0.5rem;
      min-height: 44px;
    }
    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      color: #ffffff;
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent);
      color: #ffffff;
      box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      color: #ffffff;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      background: rgba(0, 0, 0, 0.03);
      border-color: var(--text-muted);
    }
    .btn-outline-white {
      background: transparent;
      border-color: rgba(255, 255, 255, 0.3);
      color: #ffffff;
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #ffffff;
    }

    /* Common Section Styles */
    .section-wrap {
      padding: 5rem 0;
      position: relative;
    }
    .section-dark {
      background: var(--bg-dark);
      color: #ffffff;
    }
    .section-deep {
      background: var(--bg-deep);
      color: #ffffff;
    }
    .section-muted {
      background: #f1f5f9;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-head {
      margin-bottom: 3.5rem;
      text-align: center;
    }
    .section-head.text-left {
      text-align: left;
    }
    .section-subtitle {
      text-transform: uppercase;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      color: var(--primary);
      margin-bottom: 0.5rem;
      display: inline-block;
    }
    .section-dark .section-subtitle, .section-deep .section-subtitle {
      color: var(--accent);
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 1rem;
      color: inherit;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto;
    }
    .section-dark .section-desc, .section-deep .section-desc {
      color: var(--text-light);
    }

    /* Card Base */
    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(2, 132, 199, 0.4);
    }
    .feature-card .card-icon {
      width: 52px;
      height: 52px;
      border-radius: var(--radius);
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 1.25rem;
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    .feature-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 1. Hero Section (Split Screen) */
    .hero-section {
      position: relative;
      background: linear-gradient(180deg, #ffffff 0%, var(--bg-body) 100%);
      padding: 4.5rem 0 5rem;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-badge-group {
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      background: #e0f2fe;
      padding: 0.4rem 0.9rem;
      border-radius: 50px;
      margin-bottom: 1.5rem;
      border: 1px solid #bae6fd;
    }
    .hero-badge-group span {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--primary-dark);
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 1.25rem;
      letter-spacing: -0.02em;
    }
    .hero-desc {
      font-size: 1.125rem;
      line-height: 1.7;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }
    .hero-btn-row {
      display: flex;
      align-items: center;
      gap: 1rem;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
    }
    .hero-meta-strip {
      display: flex;
      align-items: center;
      gap: 2rem;
      padding-top: 1.5rem;
      border-top: 1px solid var(--border-color);
    }
    .meta-item {
      display: flex;
      flex-direction: column;
    }
    .meta-val {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--text-main);
      font-variant-numeric: tabular-nums;
    }
    .meta-lbl {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    .hero-showcase {
      position: relative;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      background: #000;
    }
    .hero-showcase img {
      width: 100%;
      height: 480px;
      object-fit: cover;
      opacity: 0.92;
    }
    .hero-floating-card {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(15, 23, 42, 0.88);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius);
      padding: 1.25rem;
      color: #fff;
    }
    .hero-floating-card .status-indicator {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
      margin-right: 0.5rem;
    }

    /* 2. Intro Section */
    .spec-badge {
      display: inline-block;
      padding: 0.2rem 0.6rem;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      background: #f1f5f9;
      color: var(--text-muted);
      margin-right: 0.5rem;
      margin-bottom: 0.5rem;
      border: 1px solid var(--border-color);
    }
    .intro-graph-box {
      background: var(--bg-surface);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .intro-graph-box img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    /* 4. Products Section */
    .product-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .product-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .product-thumb {
      height: 220px;
      overflow: hidden;
      position: relative;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 1.75rem;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-body h3 {
      font-size: 1.375rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    .tag-terminals {
      display: flex;
      gap: 0.4rem;
      margin-bottom: 1rem;
    }
    .terminal-tag {
      font-size: 0.6875rem;
      font-weight: 700;
      padding: 0.15rem 0.5rem;
      background: #e2e8f0;
      border-radius: 3px;
      color: var(--text-muted);
    }

    /* 5. Security Dark Section */
    .security-item {
      display: flex;
      gap: 1.25rem;
      margin-bottom: 1.75rem;
    }
    .security-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(2, 132, 199, 0.2);
      color: #38bdf8;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      flex-shrink: 0;
      border: 1px solid rgba(56, 189, 248, 0.4);
    }
    .security-info h4 {
      font-size: 1.125rem;
      font-weight: 700;
      color: #f8fafc;
      margin-bottom: 0.35rem;
    }
    .security-info p {
      font-size: 0.9375rem;
      color: var(--text-light);
      margin: 0;
    }

    /* 6. Cases Section */
    .case-timeline-item {
      display: flex;
      position: relative;
      padding-bottom: 2.5rem;
    }
    .case-timeline-item:last-child {
      padding-bottom: 0;
    }
    .case-timeline-item::before {
      content: '';
      position: absolute;
      left: 20px;
      top: 40px;
      bottom: 0;
      width: 2px;
      background: var(--border-color);
    }
    .case-timeline-item:last-child::before {
      display: none;
    }
    .timeline-step {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
      margin-right: 1.5rem;
      z-index: 1;
      box-shadow: 0 0 0 6px #f8fafc;
    }
    .timeline-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.5rem;
      width: 100%;
      box-shadow: var(--shadow-sm);
    }

    /* 7. Metrics Full Strip */
    .metrics-strip {
      background: var(--primary-dark);
      background-image: linear-gradient(135deg, #0369a1 0%, #0c4a6e 100%);
      color: #ffffff;
      padding: 3.5rem 0;
    }
    .metric-cell {
      text-align: center;
      border-right: 1px solid rgba(255, 255, 255, 0.15);
    }
    .metric-cell:last-child {
      border-right: none;
    }
    .metric-number {
      font-size: 3rem;
      font-weight: 900;
      color: var(--accent);
      line-height: 1;
      margin-bottom: 0.5rem;
      font-variant-numeric: tabular-nums;
    }
    .metric-label {
      font-size: 1rem;
      font-weight: 600;
      color: #f1f5f9;
      margin-bottom: 0.25rem;
    }
    .metric-sub {
      font-size: 0.8125rem;
      color: #cbd5e1;
    }

    /* 8. Comparison Table */
    .compare-table-wrap {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.9375rem;
    }
    .compare-table th, .compare-table td {
      padding: 1.25rem 1.5rem;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table th.highlight-col, .compare-table td.highlight-col {
      background: rgba(2, 132, 199, 0.05);
      border-left: 2px solid var(--primary);
      border-right: 2px solid var(--primary);
    }
    .compare-table th.highlight-col {
      border-top: 3px solid var(--primary);
      color: var(--primary);
    }

    /* 9. News Inner Articles */
    .news-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.5rem;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8125rem;
      color: var(--text-light);
      margin-bottom: 0.5rem;
    }
    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 0.75rem;
      color: var(--text-main);
    }
    .news-excerpt {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.5;
      flex-grow: 1;
      margin-bottom: 1rem;
    }

    /* 10. FAQ Foundation Accordion Override */
    .accordion {
      background: transparent;
      border: none;
    }
    .accordion-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color) !important;
      border-radius: var(--radius) !important;
      margin-bottom: 0.75rem;
      overflow: hidden;
    }
    .accordion-title {
      font-size: 1.0625rem !important;
      font-weight: 700 !important;
      color: var(--text-main) !important;
      padding: 1.25rem 1.5rem !important;
      border: none !important;
      background: transparent !important;
    }
    .accordion-title:hover {
      background: #f8fafc !important;
    }
    .accordion-content {
      padding: 0 1.5rem 1.5rem !important;
      font-size: 0.9375rem !important;
      color: var(--text-muted) !important;
      border: none !important;
      background: transparent !important;
      line-height: 1.7 !important;
    }

    /* 11. Guarantee Strip */
    .guarantee-bar {
      background: #f8fafc;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 2.5rem 0;
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .guarantee-icon {
      font-size: 2rem;
      color: var(--primary);
    }

    /* 12. Contact Form & Action */
    .contact-form-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 2.5rem;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 700;
      margin-bottom: 0.35rem;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      height: 44px;
      padding: 0.6rem 0.9rem;
      font-size: 0.9375rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      background: #f8fafc;
      margin-bottom: 0;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }
    .form-textarea {
      height: 90px;
      resize: vertical;
    }

    /* Floating Conversion Bar */
    .floating-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(15, 23, 42, 0.96);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      z-index: 999;
      padding: 0.75rem 0;
      box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.2);
    }
    .floating-bar-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .floating-title {
      color: #ffffff;
      font-size: 0.9375rem;
      font-weight: 700;
    }
    .floating-sub {
      color: var(--text-light);
      font-size: 0.8125rem;
    }

    /* Footer */
    .site-footer {
      background: var(--bg-deep);
      color: #cbd5e1;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid #1e293b;
      font-size: 0.875rem;
      }
    .footer-col-title {
      color: #ffffff;
      font-size: 1.0625rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
      position: relative;
    }
    .footer-links li {
      margin-bottom: 0.6rem;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .footer-contact-item {
      display: flex;
      gap: 0.75rem;
      margin-bottom: 0.75rem;
      color: #94a3b8;
    }
    .footer-contact-item i {
      color: var(--accent);
      margin-top: 0.25rem;
    }
    .footer-bottom {
      margin-top: 3.5rem;
      padding-top: 1.5rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.8125rem;
      color: #64748b;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 1rem;
    }
    .footer-bottom a {
      color: #64748b;
    }
    .footer-bottom a:hover {
      color: #cbd5e1;
    }

    /* Responsive */
    @media (max-width: 1023px) {
      .nav-menu { display: none; }
      .hero-title { font-size: 2.25rem; }
      .metric-cell { border-right: none; border-bottom: 1px solid rgba(255, 255, 255, 0.15); padding: 1rem 0; }
      .case-timeline-item { flex-direction: column; }
      .timeline-step { margin-bottom: 1rem; }
      .case-timeline-item::before { display: none; }
    }
    @media (max-width: 639px) {
      .top-utility-bar { display: none; }
      .hero-title { font-size: 1.875rem; }
      .hero-showcase img { height: 260px; }
      .hero-floating-card { position: static; margin-top: 1rem; }
      .floating-bar { padding: 0.6rem 0; }
      .floating-sub { display: none; }
      .section-wrap { padding: 3.5rem 0; }
      .section-title { font-size: 1.625rem; }
      .btn { width: 100%; }
      .hero-btn-row .btn { width: 100%; }
      .hero-meta-strip { flex-direction: column; gap: 1rem; }
    }