/* roulang page: index */
:root {
      --bg-primary: #0F1115;
      --bg-secondary: #181A20;
      --bg-panel: #22252E;
      --bg-hover: #2B2F3B;
      --brand-primary: #FF2A6D;
      --brand-accent: #05D9E8;
      --text-white: #F5F6FA;
      --text-muted: #A0A5B5;
      --border-dark: #2C303B;
      --border-light: rgba(255, 255, 255, 0.08);
      --badge-top1: linear-gradient(135deg, #FF2A6D, #FF6200);
      --badge-top2: linear-gradient(135deg, #05D9E8, #0056FF);
      --badge-top3: linear-gradient(135deg, #FFB800, #F53803);
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.45);
      --shadow-hover: 0 12px 32px rgba(255, 42, 109, 0.22);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

    * {
      box-sizing: border-box;
      outline: none;
    }

    body {
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-primary);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover, a:focus {
      color: var(--brand-accent);
    }

    .section-spacing {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-dark);
      position: relative;
    }

    .section-header {
      margin-bottom: 48px;
    }
    .section-header .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--brand-accent);
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      background: rgba(5, 217, 232, 0.1);
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      border-left: 3px solid var(--brand-accent);
    }
    .section-header h2 {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-white);
      margin-bottom: 12px;
      line-height: 1.3;
    }
    .section-header p {
      color: var(--text-muted);
      font-size: 1rem;
      max-width: 820px;
      margin: 0;
    }

    /* Buttons */
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: var(--brand-primary);
      color: #FFF !important;
      font-size: 0.95rem;
      font-weight: 700;
      padding: 12px 26px;
      border-radius: var(--radius-md);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(255, 42, 109, 0.4);
      transition: var(--transition);
    }
    .btn-main:hover {
      background-color: #e01e5a;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 42, 109, 0.6);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: rgba(255, 255, 255, 0.05);
      color: var(--text-white) !important;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 12px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-dark);
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      border-color: var(--brand-accent);
      color: var(--brand-accent) !important;
      background-color: rgba(5, 217, 232, 0.08);
    }

    /* Header */
    .site-header {
      background-color: #121316;
      border-bottom: 1px solid var(--border-dark);
      position: sticky;
      top: 0;
      z-index: 999;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 900;
      color: var(--text-white);
      letter-spacing: -0.5px;
    }
    .brand-logo .logo-icon {
      width: 38px;
      height: 38px;
      background: var(--brand-primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      font-size: 1.1rem;
      box-shadow: 0 0 12px rgba(255, 42, 109, 0.5);
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .desktop-nav li a {
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 6px 4px;
      position: relative;
    }
    .desktop-nav li a:hover,
    .desktop-nav li.active a {
      color: var(--text-white);
    }
    .desktop-nav li.active a::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--brand-primary);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-dark);
      color: var(--text-white);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      font-size: 1.1rem;
      cursor: pointer;
    }

    /* Hero Section */
    .hero-wrapper {
      position: relative;
      background: radial-gradient(circle at 80% 20%, rgba(255, 42, 109, 0.12) 0%, transparent 60%),
                  radial-gradient(circle at 20% 80%, rgba(5, 217, 232, 0.08) 0%, transparent 50%),
                  #0F1115;
      padding: 80px 0 60px;
      border-bottom: 1px solid var(--border-dark);
      overflow: hidden;
    }
    .hero-media-cover {
      position: absolute;
      inset: 0;
      opacity: 0.15;
      background-image: radial-gradient(var(--border-dark) 1px, transparent 1px);
      background-size: 24px 24px;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-live-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(34, 37, 46, 0.85);
      border: 1px solid var(--border-dark);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .hero-live-badge .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: #00E676;
      border-radius: 50%;
      box-shadow: 0 0 8px #00E676;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--text-white);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(90deg, #FF2A6D, #05D9E8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      color: var(--text-muted);
      font-size: 1.05rem;
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 780px;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      background: var(--bg-secondary);
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-dark);
      box-shadow: var(--shadow-card);
    }
    .metric-card {
      border-right: 1px solid var(--border-dark);
      padding-right: 16px;
    }
    .metric-card:last-child {
      border-right: none;
      padding-right: 0;
    }
    .metric-val {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--text-white);
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .metric-val .unit {
      font-size: 0.9rem;
      color: var(--brand-accent);
      font-weight: 600;
    }
    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Card Panels General */
    .geo-card {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
      height: 100%;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      position: relative;
    }
    .geo-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-light);
      box-shadow: var(--shadow-hover);
    }
    .geo-card .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
    }
    .card-icon.pink {
      background: rgba(255, 42, 109, 0.15);
      color: var(--brand-primary);
    }
    .card-icon.cyan {
      background: rgba(5, 217, 232, 0.15);
      color: var(--brand-accent);
    }
    .card-icon.yellow {
      background: rgba(255, 184, 0, 0.15);
      color: #FFB800;
    }
    .card-icon.green {
      background: rgba(0, 230, 118, 0.15);
      color: #00E676;
    }
    .geo-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-white);
    }
    .geo-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }
    .geo-card .card-metric-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      padding: 3px 10px;
      border-radius: 12px;
      background: var(--bg-panel);
      color: var(--brand-accent);
      border: 1px solid var(--border-dark);
    }

    /* Comparison Table */
    .comparison-wrapper {
      background: var(--bg-secondary);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-dark);
      overflow-x: auto;
      box-shadow: var(--shadow-card);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      margin: 0;
      background: transparent;
      color: var(--text-white);
    }
    .comparison-table thead tr {
      background: #13151A;
      border-bottom: 2px solid var(--border-dark);
    }
    .comparison-table th {
      padding: 18px 24px;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-muted);
      background: transparent;
    }
    .comparison-table th.highlight-col {
      color: var(--brand-primary);
      background: rgba(255, 42, 109, 0.05);
      border-left: 1px solid rgba(255, 42, 109, 0.2);
      border-right: 1px solid rgba(255, 42, 109, 0.2);
    }
    .comparison-table td {
      padding: 18px 24px;
      font-size: 0.92rem;
      border-bottom: 1px solid var(--border-dark);
      background: transparent;
      color: var(--text-white);
    }
    .comparison-table td.highlight-col {
      background: rgba(255, 42, 109, 0.03);
      font-weight: 700;
      border-left: 1px solid rgba(255, 42, 109, 0.2);
      border-right: 1px solid rgba(255, 42, 109, 0.2);
      color: #fff;
    }
    .check-yes {
      color: #00E676;
      font-weight: 800;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .check-no {
      color: #FF5252;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* Timeline / Milestones */
    .timeline-container {
      position: relative;
      padding-left: 32px;
    }
    .timeline-container::before {
      content: '';
      position: absolute;
      left: 11px;
      top: 10px;
      bottom: 10px;
      width: 2px;
      background: var(--border-dark);
    }
    .timeline-node {
      position: relative;
      margin-bottom: 36px;
    }
    .timeline-node:last-child {
      margin-bottom: 0;
    }
    .timeline-dot {
      position: absolute;
      left: -32px;
      top: 6px;
      width: 24px;
      height: 24px;
      background: var(--bg-primary);
      border: 3px solid var(--brand-accent);
      border-radius: 50%;
      box-shadow: 0 0 10px rgba(5, 217, 232, 0.5);
    }
    .timeline-node.active .timeline-dot {
      border-color: var(--brand-primary);
      box-shadow: 0 0 12px rgba(255, 42, 109, 0.7);
    }
    .timeline-card {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-card);
    }
    .timeline-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 10px;
    }
    .timeline-phase {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--brand-accent);
      background: rgba(5, 217, 232, 0.1);
      padding: 2px 8px;
      border-radius: 4px;
    }
    .timeline-time {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .timeline-card h4 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: var(--text-white);
    }
    .timeline-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin: 0;
      line-height: 1.6;
    }

    /* Top Ranking Items (GEO Rank Style) */
    .ranking-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .ranking-item {
      display: flex;
      align-items: center;
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 18px 24px;
      gap: 20px;
      transition: var(--transition);
      position: relative;
    }
    .ranking-item:hover {
      border-color: rgba(255, 42, 109, 0.4);
      background: var(--bg-panel);
      transform: translateX(4px);
    }
    .rank-badge {
      font-size: 1.5rem;
      font-weight: 900;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      flex-shrink: 0;
    }
    .rank-top1 { background: var(--badge-top1); color: #fff; box-shadow: 0 0 12px rgba(255, 42, 109, 0.5); }
    .rank-top2 { background: var(--badge-top2); color: #fff; }
    .rank-top3 { background: var(--badge-top3); color: #fff; }
    .rank-topN { background: var(--bg-panel); color: var(--text-muted); border: 1px solid var(--border-dark); }
    .rank-thumb-box {
      width: 80px;
      height: 52px;
      background: #111317;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      font-size: 1.2rem;
      flex-shrink: 0;
      border: 1px solid var(--border-dark);
    }
    .rank-info {
      flex: 1;
      min-width: 0;
    }
    .rank-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 4px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .rank-meta-row {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .rank-meta-row span {
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .rank-score-box {
      text-align: right;
      flex-shrink: 0;
    }
    .rank-score-num {
      font-size: 1.4rem;
      font-weight: 900;
      color: #FFB800;
    }
    .rank-score-desc {
      font-size: 0.75rem;
      color: var(--text-muted);
    }
    .rank-action-btn {
      flex-shrink: 0;
    }

    /* Guarantee Grid */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .guarantee-item {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      gap: 16px;
      transition: var(--transition);
    }
    .guarantee-item:hover {
      border-color: var(--brand-accent);
      background: var(--bg-panel);
    }
    .guarantee-icon-wrap {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(5, 217, 232, 0.1);
      color: var(--brand-accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      flex-shrink: 0;
    }
    .guarantee-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 6px;
    }
    .guarantee-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin: 0;
      line-height: 1.55;
    }

    /* Device Grid */
    .device-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .device-card {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition);
    }
    .device-card:hover {
      border-color: var(--brand-primary);
      transform: translateY(-4px);
    }
    .device-card .dev-icon {
      font-size: 2.2rem;
      color: var(--brand-accent);
      margin-bottom: 16px;
    }
    .device-card h4 {
      font-size: 1.1rem;
      color: var(--text-white);
      margin-bottom: 8px;
    }
    .device-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
      margin: 0;
    }

    /* Fast Track Steps */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-box {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-seq {
      position: absolute;
      top: 16px;
      right: 18px;
      font-size: 2rem;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.05);
      line-height: 1;
    }
    .step-box h4 {
      font-size: 1.05rem;
      color: var(--text-white);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .step-box h4 i {
      color: var(--brand-primary);
      font-size: 1rem;
    }
    .step-box p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin: 0;
      line-height: 1.55;
    }

    /* Quick Insights (2-column grid) */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .insight-card {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 26px;
    }
    .insight-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--brand-accent);
      text-transform: uppercase;
      margin-bottom: 8px;
    }
    .insight-card h4 {
      font-size: 1.15rem;
      color: var(--text-white);
      margin-bottom: 10px;
    }
    .insight-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin: 0;
      line-height: 1.6;
    }

    /* Accordion FAQ */
    .faq-accordion {
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: var(--bg-secondary);
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-dark);
    }
    .faq-item:last-child {
      border-bottom: none;
    }
    .faq-title {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-white);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--bg-secondary);
      transition: var(--transition);
    }
    .faq-title:hover {
      background: var(--bg-panel);
      color: var(--brand-accent);
    }
    .faq-title i {
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }
    .faq-content {
      padding: 0 24px 22px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
      display: none;
    }
    .faq-item.is-active .faq-content {
      display: block;
    }
    .faq-item.is-active .faq-title i {
      transform: rotate(180deg);
      color: var(--brand-primary);
    }

    /* Feedback Wall */
    .feedback-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .feedback-card {
      background: var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .feedback-stars {
      color: #FFB800;
      font-size: 0.85rem;
      margin-bottom: 12px;
    }
    .feedback-body {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .feedback-user-info {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-top: 1px solid var(--border-dark);
      padding-top: 14px;
      font-size: 0.82rem;
    }
    .feedback-user-id {
      color: var(--text-white);
      font-weight: 600;
    }
    .feedback-user-meta {
      color: var(--text-muted);
    }

    /* Action Form Section */
    .action-form-box {
      background: radial-gradient(circle at 100% 0%, rgba(255, 42, 109, 0.15) 0%, transparent 60%), var(--bg-secondary);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: var(--shadow-card);
    }
    .form-inputs-row {
      display: flex;
      gap: 16px;
      margin-top: 24px;
      max-width: 680px;
    }
    .form-inputs-row input[type="text"] {
      background: var(--bg-panel);
      border: 1px solid var(--border-dark);
      color: var(--text-white);
      border-radius: var(--radius-md);
      padding: 14px 18px;
      font-size: 0.95rem;
      height: auto;
      margin: 0;
      flex: 1;
      transition: var(--transition);
    }
    .form-inputs-row input[type="text"]:focus {
      border-color: var(--brand-accent);
      background: #1d2027;
      box-shadow: 0 0 8px rgba(5, 217, 232, 0.3);
    }

    /* Footer */
    .site-footer {
      background-color: #0c0d10;
      border-top: 1px solid var(--border-dark);
      padding: 64px 0 32px;
      color: var(--text-muted);
    }
    .footer-col h4 {
      color: var(--text-white);
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: var(--brand-accent);
    }
    .footer-bottom {
      margin-top: 48px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.85rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }
    .footer-certs {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .cert-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      color: var(--text-muted);
      background: rgba(255, 255, 255, 0.03);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-dark);
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .metric-card {
        border-right: none;
        border-bottom: 1px solid var(--border-dark);
        padding-bottom: 12px;
      }
      .metric-card:nth-child(3), .metric-card:nth-child(4) {
        border-bottom: none;
        padding-bottom: 0;
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .device-grid, .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .feedback-grid {
        grid-template-columns: repeat(1, 1fr);
      }
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .section-spacing {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-metrics-grid {
        grid-template-columns: 1fr;
      }
      .metric-card {
        border-bottom: 1px solid var(--border-dark);
      }
      .metric-card:last-child {
        border-bottom: none;
      }
      .guarantee-grid, .device-grid, .steps-container, .insights-grid {
        grid-template-columns: 1fr;
      }
      .ranking-item {
        flex-wrap: wrap;
        gap: 12px;
      }
      .rank-action-btn {
        width: 100%;
      }
      .rank-action-btn .btn-outline {
        width: 100%;
      }
      .form-inputs-row {
        flex-direction: column;
      }
    }

/* roulang page: category1 */
:root {
        --bg-primary: #0F1115;
        --bg-secondary: #181A20;
        --bg-panel: #22252E;
        --bg-hover: #2B2F3B;
        --brand-primary: #FF2A6D;
        --brand-accent: #05D9E8;
        --text-white: #F5F6FA;
        --text-muted: #A0A5B5;
        --border-dark: #2C303B;
        --border-light: rgba(255, 255, 255, 0.08);
        --badge-top1: linear-gradient(135deg, #FF2A6D, #FF6200);
        --badge-top2: linear-gradient(135deg, #05D9E8, #0056FF);
        --badge-top3: linear-gradient(135deg, #FFB800, #F53803);
        --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.45);
        --shadow-hover: 0 12px 32px rgba(255, 42, 109, 0.22);
        --radius-sm: 4px;
        --radius-md: 8px;
        --radius-lg: 12px;
        --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    body {
        margin: 0;
        padding: 0;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        background-color: var(--bg-primary);
        color: var(--text-white);
        line-height: 1.6;
        -webkit-font-smoothing: antialiased;
    }
    a {
        color: inherit;
        text-decoration: none;
        transition: var(--transition);
    }
    a:hover, a:focus {
        color: var(--brand-accent);
    }
    .section-spacing {
        padding: 70px 0;
        border-bottom: 1px solid var(--border-dark);
        position: relative;
    }
    .section-header {
        margin-bottom: 40px;
    }
    .section-header .section-tag {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        color: var(--brand-accent);
        font-size: 0.85rem;
        font-weight: 700;
        letter-spacing: 1.5px;
        background: rgba(5, 217, 232, 0.1);
        padding: 4px 12px;
        border-radius: var(--radius-sm);
        margin-bottom: 12px;
        border-left: 3px solid var(--brand-accent);
    }
    .section-header h2 {
        font-size: 1.85rem;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 10px;
        line-height: 1.3;
    }
    .section-header p {
        color: var(--text-muted);
        font-size: 0.96rem;
        max-width: 820px;
        margin: 0;
    }
    /* Buttons */
    .btn-main {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background-color: var(--brand-primary);
        color: #FFF !important;
        font-size: 0.95rem;
        font-weight: 700;
        padding: 12px 24px;
        border-radius: var(--radius-md);
        border: none;
        cursor: pointer;
        box-shadow: 0 4px 15px rgba(255, 42, 109, 0.4);
        transition: var(--transition);
    }
    .btn-main:hover {
        background-color: #e01e5a;
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(255, 42, 109, 0.6);
    }
    .btn-outline {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background-color: rgba(255, 255, 255, 0.05);
        color: var(--text-white) !important;
        font-size: 0.9rem;
        font-weight: 600;
        padding: 10px 20px;
        border-radius: var(--radius-md);
        border: 1px solid var(--border-dark);
        cursor: pointer;
        transition: var(--transition);
    }
    .btn-outline:hover {
        border-color: var(--brand-accent);
        color: var(--brand-accent) !important;
        background-color: rgba(5, 217, 232, 0.08);
    }
    /* Header */
    .site-header {
        background-color: #121316;
        border-bottom: 1px solid var(--border-dark);
        position: sticky;
        top: 0;
        z-index: 999;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
    }
    .nav-container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 72px;
    }
    .brand-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.35rem;
        font-weight: 900;
        color: var(--text-white);
        letter-spacing: -0.5px;
    }
    .brand-logo .logo-icon {
        width: 38px;
        height: 38px;
        background: var(--brand-primary);
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        font-size: 1.1rem;
        box-shadow: 0 0 12px rgba(255, 42, 109, 0.5);
    }
    .desktop-nav {
        display: flex;
        align-items: center;
        gap: 24px;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .desktop-nav li a {
        color: var(--text-muted);
        font-size: 0.95rem;
        font-weight: 500;
        padding: 6px 4px;
        position: relative;
    }
    .desktop-nav li a:hover,
    .desktop-nav li.active a {
        color: var(--text-white);
    }
    .desktop-nav li.active a::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 0;
        width: 100%;
        height: 2px;
        background: var(--brand-primary);
    }
    .header-actions {
        display: flex;
        align-items: center;
        gap: 16px;
    }
    .mobile-menu-toggle {
        display: none;
        background: none;
        border: 1px solid var(--border-dark);
        color: var(--text-white);
        padding: 8px 12px;
        border-radius: var(--radius-sm);
        font-size: 1.1rem;
        cursor: pointer;
    }
    /* Mobile Drawer */
    .mobile-nav-drawer {
        display: none;
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-dark);
        padding: 16px 20px;
    }
    .mobile-nav-drawer.is-open {
        display: block;
    }
    .mobile-nav-drawer ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .mobile-nav-drawer ul li {
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .mobile-nav-drawer ul li a {
        color: var(--text-white);
        font-size: 1rem;
        display: block;
    }
    /* Category Section 1: Header & Stats */
    .cat-hero-panel {
        background: radial-gradient(circle at 85% 30%, rgba(255, 42, 109, 0.14) 0%, transparent 60%),
                    radial-gradient(circle at 15% 70%, rgba(5, 217, 232, 0.08) 0%, transparent 50%),
                    var(--bg-secondary);
        padding: 50px 0;
        border-bottom: 1px solid var(--border-dark);
    }
    .cat-hero-panel h1 {
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 12px;
        line-height: 1.25;
    }
    .cat-desc {
        color: var(--text-muted);
        font-size: 1rem;
        max-width: 860px;
        margin-bottom: 30px;
    }
    .cat-metrics-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 16px;
    }
    .cat-metric-box {
        background: var(--bg-panel);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        padding: 18px 20px;
        box-shadow: var(--shadow-card);
        position: relative;
        overflow: hidden;
    }
    .cat-metric-box::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 3px;
        height: 100%;
        background: var(--brand-accent);
    }
    .cat-metric-box:nth-child(1)::before {
        background: var(--brand-primary);
    }
    .cat-metric-box .metric-num {
        font-size: 1.8rem;
        font-weight: 800;
        color: var(--text-white);
        line-height: 1.1;
        margin-bottom: 4px;
        font-feature-settings: "tnum";
    }
    .cat-metric-box .metric-num span {
        font-size: 0.9rem;
        color: var(--brand-accent);
        margin-left: 4px;
    }
    .cat-metric-box .metric-title {
        font-size: 0.85rem;
        color: var(--text-muted);
    }
    /* Category Section 2: Filter Bar */
    .filter-wrapper {
        background: var(--bg-panel);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        padding: 18px 24px;
        margin-bottom: 35px;
        box-shadow: var(--shadow-card);
    }
    .filter-row {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px 18px;
    }
    .filter-row + .filter-row {
        margin-top: 14px;
        padding-top: 14px;
        border-top: 1px solid var(--border-light);
    }
    .filter-label {
        font-size: 0.88rem;
        color: var(--text-muted);
        font-weight: 600;
        min-width: 70px;
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .filter-chips {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .filter-chip {
        padding: 6px 14px;
        font-size: 0.85rem;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border-dark);
        background: rgba(255, 255, 255, 0.03);
        color: var(--text-muted);
        cursor: pointer;
        transition: var(--transition);
    }
    .filter-chip:hover, .filter-chip.active {
        background: var(--brand-primary);
        border-color: var(--brand-primary);
        color: #fff;
    }
    .filter-chip.accent.active {
        background: rgba(5, 217, 232, 0.15);
        border-color: var(--brand-accent);
        color: var(--brand-accent);
    }
    /* Category Section 3: Media Cards Grid */
    .media-card {
        background: var(--bg-panel);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        overflow: hidden;
        margin-bottom: 24px;
        transition: var(--transition);
        display: flex;
        flex-direction: column;
        height: calc(100% - 24px);
        position: relative;
    }
    .media-card:hover {
        transform: translateY(-4px);
        border-color: var(--brand-primary);
        box-shadow: var(--shadow-hover);
    }
    .media-thumb-box {
        position: relative;
        width: 100%;
        padding-top: 58%;
        background: #15171e;
        overflow: hidden;
    }
    .media-thumb-img {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        background: linear-gradient(135deg, #1d212a, #111317);
        display: flex;
        align-items: center;
        justify-content: center;
        color: rgba(255, 255, 255, 0.15);
        font-size: 2.5rem;
    }
    .badge-rank {
        position: absolute;
        top: 10px;
        left: 10px;
        padding: 3px 9px;
        border-radius: 4px;
        font-size: 0.75rem;
        font-weight: 800;
        color: #fff;
        z-index: 2;
        letter-spacing: 0.5px;
    }
    .rank-top1 { background: var(--badge-top1); }
    .rank-top2 { background: var(--badge-top2); }
    .rank-top3 { background: var(--badge-top3); }
    .rank-normal { background: rgba(0, 0, 0, 0.75); border: 1px solid var(--border-light); }
    .badge-quality {
        position: absolute;
        top: 10px;
        right: 10px;
        background: rgba(5, 217, 232, 0.2);
        border: 1px solid var(--brand-accent);
        color: var(--brand-accent);
        font-size: 0.72rem;
        font-weight: 700;
        padding: 2px 7px;
        border-radius: 3px;
        z-index: 2;
    }
    .media-duration-tag {
        position: absolute;
        bottom: 8px;
        right: 10px;
        background: rgba(0, 0, 0, 0.78);
        color: #fff;
        font-size: 0.72rem;
        padding: 2px 6px;
        border-radius: 3px;
        z-index: 2;
        font-family: monospace;
    }
    .media-card-body {
        padding: 16px;
        display: flex;
        flex-direction: column;
        flex-grow: 1;
    }
    .media-card-title {
        font-size: 1rem;
        font-weight: 700;
        line-height: 1.4;
        margin-bottom: 8px;
        color: var(--text-white);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .media-card-title:hover {
        color: var(--brand-primary);
    }
    .media-meta-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
        font-size: 0.8rem;
        color: var(--text-muted);
        margin-bottom: 12px;
    }
    .media-score-bar {
        margin-top: auto;
        padding-top: 10px;
        border-top: 1px solid var(--border-light);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .media-score-val {
        color: var(--brand-accent);
        font-weight: 800;
        font-size: 0.95rem;
    }
    .media-btn-play {
        font-size: 0.8rem;
        font-weight: 700;
        color: var(--brand-primary);
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }
    .media-btn-play:hover {
        color: #fff;
    }
    .pagination-bar {
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 8px;
        margin-top: 30px;
    }
    .page-node {
        min-width: 38px;
        height: 38px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border-dark);
        background: var(--bg-panel);
        color: var(--text-muted);
        font-size: 0.9rem;
        font-weight: 600;
        cursor: pointer;
        transition: var(--transition);
    }
    .page-node:hover, .page-node.active {
        background: var(--brand-primary);
        border-color: var(--brand-primary);
        color: #fff;
    }
    /* Category Section 4: Trending Momentum */
    .trending-box {
        background: var(--bg-secondary);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        padding: 24px;
        box-shadow: var(--shadow-card);
        height: 100%;
    }
    .trending-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 14px 0;
        border-bottom: 1px solid var(--border-light);
    }
    .trending-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }
    .trending-rank-num {
        font-size: 1.1rem;
        font-weight: 800;
        width: 32px;
        color: var(--brand-primary);
    }
    .trending-info {
        flex-grow: 1;
        padding: 0 14px;
    }
    .trending-title {
        font-size: 0.92rem;
        font-weight: 700;
        color: var(--text-white);
        margin-bottom: 4px;
    }
    .trending-rate {
        font-size: 0.85rem;
        color: #00E676;
        font-weight: 700;
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }
    .trending-latency {
        font-size: 0.78rem;
        color: var(--text-muted);
    }
    /* Category Section 5: Encoding Standards */
    .spec-card {
        background: var(--bg-panel);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        padding: 24px;
        box-shadow: var(--shadow-card);
        height: 100%;
    }
    .spec-header {
        display: flex;
        align-items: center;
        gap: 12px;
        margin-bottom: 18px;
    }
    .spec-icon {
        width: 44px;
        height: 44px;
        border-radius: 8px;
        background: rgba(5, 217, 232, 0.1);
        border: 1px solid rgba(5, 217, 232, 0.3);
        color: var(--brand-accent);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.25rem;
    }
    .spec-title-group h3 {
        font-size: 1.15rem;
        font-weight: 700;
        color: var(--text-white);
        margin: 0;
    }
    .spec-title-group span {
        font-size: 0.8rem;
        color: var(--text-muted);
    }
    .spec-list {
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .spec-list li {
        display: flex;
        justify-content: space-between;
        padding: 10px 0;
        font-size: 0.88rem;
        border-bottom: 1px solid var(--border-light);
    }
    .spec-list li:last-child {
        border-bottom: none;
    }
    .spec-label {
        color: var(--text-muted);
    }
    .spec-val {
        color: var(--text-white);
        font-weight: 600;
    }
    /* Category Section 6: Specific FAQ */
    .faq-item {
        background: var(--bg-panel);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        margin-bottom: 16px;
        overflow: hidden;
    }
    .faq-question {
        padding: 18px 22px;
        font-size: 1.02rem;
        font-weight: 700;
        color: var(--text-white);
        display: flex;
        align-items: center;
        justify-content: space-between;
        cursor: pointer;
        background: var(--bg-panel);
        transition: var(--transition);
    }
    .faq-question:hover {
        color: var(--brand-accent);
    }
    .faq-answer {
        padding: 0 22px 20px;
        color: var(--text-muted);
        font-size: 0.92rem;
        line-height: 1.68;
    }
    /* Category Section 7: Cross Navigation */
    .cross-cat-card {
        background: linear-gradient(135deg, var(--bg-panel), #14171E);
        border: 1px solid var(--border-dark);
        border-radius: var(--radius-md);
        padding: 30px;
        position: relative;
        overflow: hidden;
        height: 100%;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        transition: var(--transition);
    }
    .cross-cat-card:hover {
        border-color: var(--brand-accent);
        transform: translateY(-4px);
    }
    .cross-cat-badge {
        font-size: 0.8rem;
        color: var(--brand-accent);
        font-weight: 700;
        text-transform: uppercase;
        margin-bottom: 8px;
    }
    .cross-cat-card h3 {
        font-size: 1.3rem;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 10px;
    }
    .cross-cat-card p {
        font-size: 0.88rem;
        color: var(--text-muted);
        margin-bottom: 20px;
    }
    /*Footer */
    .site-footer {
        background-color: #0c0e12;
        border-top: 1px solid var(--border-dark);
        padding: 60px 0 24px;
    }
    .footer-col h4 {
        font-size: 1rem;
        font-weight: 700;
        color: var(--text-white);
        margin-bottom: 18px;
        position: relative;
        padding-left: 10px;
    }
    .footer-col h4::before {
        content: '';
        position: absolute;
        left: 0;
        top: 3px;
        bottom: 3px;
        width: 3px;
        background: var(--brand-primary);
        border-radius: 2px;
    }
    .footer-links {
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .footer-links li {
        margin-bottom: 10px;
    }
    .footer-links li a {
        color: var(--text-muted);
        font-size: 0.88rem;
    }
    .footer-links li a:hover {
        color: var(--brand-accent);
    }
    .footer-certs {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 12px;
    }
    .cert-item {
        display: inline-flex;
        align-items: center;
        gap: 5px;
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid var(--border-dark);
        color: var(--text-muted);
        font-size: 0.78rem;
        padding: 4px 8px;
        border-radius: 4px;
    }
    .footer-bottom {
        margin-top: 50px;
        padding-top: 20px;
        border-top: 1px solid var(--border-dark);
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 0.82rem;
        color: #7B8191;
    }

    /* Responsive */
    @media screen and (max-width: 1024px) {
        .cat-metrics-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media screen and (max-width: 768px) {
        .desktop-nav {
            display: none;
        }
        .mobile-menu-toggle {
            display: inline-block;
        }
        .cat-hero-panel h1 {
            font-size: 1.7rem;
        }
        .cat-metrics-grid {
            grid-template-columns: 1fr;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }