:root {
    --bg: #0a0d12;
    --bg2: #23133a;
    --bg3: #23133a;
    --bg4: #1f1232;
    --border: #3a1c63;
    --border2: #5e309d;
    --cyan: #883CF0;
    --cyan-dim: #2a1647;
    --green: #af62c8;
    --green-dim: #311d38;
    --amber: #ffb830;
    --amber-dim: #c88a00;
    --red: #ff4d6d;
    --red-dim: #c0213d;
    --text: #c8d8e8;
    --text-dim: #e8edf7;
    --text-faint: #d6d6d6;
    --heading: #e8f4ff;
    --rdp-color: #883CF0;
    --pra-color: #af62c8;
    --rdp-bg: #2a164769;
    --pra-bg: #311d3861;
    --rdp-border: #3a1c63;
    --pra-border: #5e309d;
  }

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

  .rdp-launcher-training-guide {
    background: #191127;
    color: var(--text);
    font-weight: 300;
    line-height: 1.65;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
  }

  /* Grid overlay */
  .rdp-launcher-training-guide::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(rgba(255, 0, 217, 0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 0, 225, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
  }

  /* ─── HEADER ─────────────────────────────────────────── */
  .header {
    position: relative;
    padding: 60px 40px 50px;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    z-index: 1;
  }

  .header-glow {
    position: absolute;
    top: -100px; left: 50%;
    transform: translateX(-50%);
    width: 800px; height: 300px;
    background: radial-gradient(ellipse, rgba(179, 0, 255, 0.08) 0%, transparent 70%);
    pointer-events: none;
  }

  .header-inner {
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
  }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 10px;
    font-weight: 500;
    text-transform: uppercase;
    color: var(--cyan);
    background: var(--rdp-bg);
    border: 1px solid var(--rdp-border);
    padding: 5px 12px;
    margin-bottom: 20px;
  }

  .badge::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--cyan);
    border-radius: 50%;
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.8); }
  }

  .rdp-launcher-training-guide h1 {
    font-size: clamp(28px, 4vw, 52px);
    font-weight: 800;
    color: var(--heading);
    line-height: 1.1;
    margin-bottom: 16px;
  }

  h1 .rdp { color: var(--rdp-color); }
  h1 .pra { color: var(--pra-color); }
  h1 .vs { color: var(--text-dim); font-weight: 400; }

  .header-sub {
    font-size: 15px;
    color: var(--text-dim);
    max-width: 620px;
    margin-bottom: 30px;
  }

  .header-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
  }

  .meta-chip {
    font-size: 11px;
    color: var(--text-dim);
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .meta-chip span { color: var(--text); }

  /* ─── NAV ─────────────────────────────────────────────── */
  .nav-wrapper {
    position: sticky;
    top: 0;
    z-index: 1;
    background: #180f26;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }

  .nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar { display: none; }

  .nav-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 11px;
    text-transform: uppercase;
    padding: 16px 20px;
    cursor: pointer;
    position: relative;
    white-space: nowrap;
    transition: color 0.2s;
  }

  .nav-btn::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: var(--cyan);
    transform: scaleX(0);
    transition: transform 0.2s;
  }

  .nav-btn:hover { color: var(--text); }
  .nav-btn.active { color: var(--cyan); }
  .nav-btn.active::after { transform: scaleX(1); }

  /* ─── MAIN ────────────────────────────────────────────── */
  .main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 50px 40px 80px;
    position: relative;
  }

  .section { display: none; animation: fadeIn 0.35s ease; }
  .section.active { display: block; }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* ─── SECTION HEADER ──────────────────────────────────── */
  .section-header {
    margin-bottom: 40px;
  }

  .section-label {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 10px;
  }

  .section-title {
    font-size: 30px;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 10px;
  }

  .section-desc {
    font-size: 14px;
    color: var(--text-dim);
    max-width: 680px;
  }

  /* ─── COMPARISON GRID ─────────────────────────────────── */
  .compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
  }

  .compare-card {
    border: 1px solid var(--border2);
    padding: 28px;
    position: relative;
    overflow: hidden;
  }

  .compare-card.rdp {
    border-color: var(--rdp-border);
    background: var(--rdp-bg);
  }

  .compare-card.pra {
    border-color: var(--pra-border);
    background: var(--pra-bg);
  }

  .compare-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
  }

  .compare-card.rdp::before { background: var(--rdp-color); }
  .compare-card.pra::before { background: var(--pra-color); }

  .card-tag {
    font-size: 9px;
    text-transform: uppercase;
    font-weight: 600;
    padding: 4px 10px;
    margin-bottom: 16px;
    display: inline-block;
  }

  .rdp .card-tag { color: var(--rdp-color); background: #2a1647; }
  .pra .card-tag { color: var(--pra-color); background: #2a1647; }

  .card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 12px;
  }

  .card-text {
    font-size: 13.5px;
    color: var(--text-dim);
    line-height: 1.7;
  }

  /* ─── ATTRIBUTE TABLE ─────────────────────────────────── */
  .attr-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 30px;
    font-size: 13.5px;
  }

  .attr-table th {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border2);
    background: #883cf050;
  }

  .attr-table th:nth-child(2) { color: var(--rdp-color); }
  .attr-table th:nth-child(3) { color: var(--pra-color); }

  .attr-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    line-height: 1.6;
    color: var(--text-dim);
  }

  .attr-table td:first-child {
    font-size: 12px;
    color: var(--text);
    white-space: nowrap;
    font-weight: 500;
  }

  .attr-table tr:hover td { background: #1f1232; }

  .attr-table td:nth-child(2) { background: #23133a5c; }
  .attr-table td:nth-child(3) { background: #23133ac2; }

  .tag-good {
    display: inline-block;
    color: var(--green);
    font-size: 10px;
    background: rgba(0,229,160,0.08);
    padding: 2px 7px;
    margin-left: 6px;
  }

  .tag-warn {
    display: inline-block;
    color: var(--amber);
    font-size: 10px;
    background: rgba(255,184,48,0.08);
    padding: 2px 7px;
    margin-left: 6px;
  }

  .tag-bad {
    display: inline-block;
    color: var(--red);
    font-size: 10px;
    background: rgba(255,77,109,0.08);
    padding: 2px 7px;
    margin-left: 6px;
  }

  /* ─── ARCHITECTURE DIAGRAM ────────────────────────────── */
  .arch-diagram {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
  }

  .arch-panel {
    border: 1px solid var(--border2);
    padding: 28px 24px;
    position: relative;
  }

  .arch-panel.rdp { border-color: var(--rdp-border); }
  .arch-panel.pra { border-color: var(--pra-border); }

  .arch-title {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .arch-title .dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
  }

  .rdp .dot { background: var(--rdp-color); box-shadow: 0 0 8px var(--rdp-color); }
  .pra .dot { background: var(--pra-color); box-shadow: 0 0 8px var(--pra-color); }

  .arch-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
  }

  .arch-node {
    width: 100%;
    padding: 10px 14px;
    font-size: 11px;
    font-weight: 500;
    text-align: center;
    border: 1px solid var(--border2);
    background: var(--bg3);
    color: var(--text);
    position: relative;
  }

  .arch-node.highlight-rdp {
    border-color: #3a1c63;
    background: #1f1232;
    color: var(--rdp-color);
  }

  .arch-node.highlight-pra {
    border-color: rgba(0,229,160,0.4);
    background: rgba(0,229,160,0.07);
    color: var(--pra-color);
  }

  .arch-node.highlight-proxy {
    border-color: rgba(255,184,48,0.4);
    background: rgba(255,184,48,0.07);
    color: var(--amber);
  }

  .arch-arrow {
    width: 2px;
    height: 20px;
    background: var(--border2);
    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    flex-shrink: 0;
  }

  .arch-arrow::after {
    content: '▼';
    font-size: 8px;
    color: var(--border2);
    position: absolute;
    bottom: -2px;
  }

  .arch-arrow.rdp-line { background: rgba(0,212,255,0.3); }
  .arch-arrow.rdp-line::after { color: rgba(0,212,255,0.5); }
  .arch-arrow.pra-line { background: rgba(0,229,160,0.3); }
  .arch-arrow.pra-line::after { color: rgba(0,229,160,0.5); }
  .arch-arrow.proxy-line { background: rgba(255,184,48,0.3); }
  .arch-arrow.proxy-line::after { color: rgba(255,184,48,0.5); }

  .arch-label {
    font-size: 9px;
    color: var(--text-faint);
    text-transform: uppercase;
    margin: 4px 0;
    text-align: center;
  }

  /* ─── INFO BLOCKS ─────────────────────────────────────── */
  .info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 30px;
  }

  .info-block {
    border: 1px solid var(--border2);
    padding: 22px;
    background: var(--bg2);
  }

  .info-block-icon {
    font-size: 22px;
    margin-bottom: 12px;
    display: block;
  }

  .info-block-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 8px;
  }

  .info-block-text {
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.65;
  }

  /* ─── DECISION TREE ───────────────────────────────────── */
  .decision-tree {
    border: 1px solid var(--border2);
    padding: 32px;
    background: var(--bg2);
    margin-bottom: 30px;
  }

  .decision-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .decision-title::before {
    content: '';
    width: 4px; height: 18px;
    background: var(--cyan);
    display: block;
    flex-shrink: 0;
  }

  .question-card {
    border: 1px solid var(--border2);
    background: var(--bg3);
    padding: 18px 20px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
  }

  .question-card:hover { border-color: var(--border2); background: var(--bg4); }

  .question-card.open { border-color: var(--cyan); }

  .question-text {
    font-size: 13.5px;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
  }

  .question-toggle {
    font-size: 14px;
    color: var(--text-dim);
    flex-shrink: 0;
    transition: transform 0.2s;
  }

  .question-card.open .question-toggle { transform: rotate(45deg); color: var(--cyan); }

  .question-answer {
    display: none;
    padding-top: 14px;
    margin-top: 14px;
    border-top: 1px solid var(--border);
  }

  .question-card.open .question-answer { display: block; }

  .answer-verdict {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    margin-bottom: 10px;
    font-size: 11px;
    font-weight: 600;
  }

  .verdict-rdp { background: var(--rdp-bg); border: 1px solid var(--rdp-border); color: var(--rdp-color); }
  .verdict-pra { background: var(--pra-bg); border: 1px solid var(--pra-border); color: var(--pra-color); }
  .verdict-both { background: rgba(255,184,48,0.08); border: 1px solid rgba(255,184,48,0.2); color: var(--amber); }

  .answer-text { font-size: 13px; color: var(--text-dim); line-height: 1.65; }

  /* ─── PERSONA TOGGLE ──────────────────────────────────── */
  .persona-bar {
    display: flex;
    gap: 0;
    margin-bottom: 30px;
    border: 1px solid var(--border2);
    overflow: hidden;
  }

  .persona-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 14px 24px;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-dim);
    cursor: pointer;
    transition: all 0.2s;
    border-right: 1px solid var(--border2);
    position: relative;
  }

  .persona-btn:last-child { border-right: none; }

  .persona-btn.active {
    color: var(--heading);
    background: var(--bg3);
  }

  .persona-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: var(--cyan);
  }

  .persona-view { display: none; }
  .persona-view.active { display: block; animation: fadeIn 0.25s ease; }

  /* ─── UX STEPS ────────────────────────────────────────── */
  .ux-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
  }

  .ux-col-header {
    font-size: 10px;
    text-transform: uppercase;
    padding: 10px 14px;
    margin-bottom: 12px;
    font-weight: 600;
  }

  .rdp-col-header { color: var(--rdp-color); background: var(--rdp-bg); border: 1px solid var(--rdp-border); }
  .pra-col-header { color: var(--pra-color); background: var(--pra-bg); border: 1px solid var(--pra-border); }

  .step-list { display: flex; flex-direction: column; gap: 8px; }

  .step-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 12px 14px;
    border: 1px solid var(--border);
    background: var(--bg2);
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.55;
  }

  .step-num {
    font-size: 10px;
    font-weight: 600;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 1px;
  }

  .rdp-col .step-num { color: var(--rdp-color); border: 1px solid #3a1c63; }
  .pra-col .step-num { color: var(--pra-color); border: 1px solid rgba(0,229,160,0.3); }

  /* ─── CALLOUT BLOCKS ──────────────────────────────────── */
  .callout {
    border-left: 3px solid;
    padding: 16px 20px;
    margin-bottom: 20px;
    font-size: 13.5px;
    line-height: 1.65;
  }

  .callout-tip { border-color: var(--cyan); background: #23133a; color: var(--text-dim); }
  .callout-warn { border-color: var(--amber); background: rgba(255,184,48,0.04); color: var(--text-dim); }
  .callout-danger { border-color: var(--red); background: rgba(255,77,109,0.04); color: var(--text-dim); }

  .callout strong { color: var(--heading); font-weight: 500; }

  /* ─── FIREWALL TABLE ──────────────────────────────────── */
  .fw-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
    font-size: 13px;
  }

  .fw-table th {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: 10px 14px;
    text-align: left;
    background: #883cf050;
    border-bottom: 1px solid var(--border2);
  }

  .fw-table td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-dim);
    vertical-align: top;
  }

  .fw-table td:first-child {
    font-size: 12px;
    color: var(--amber);
  }

  .fw-table tr:hover td { background: #1f1232; }

  .port-pill {
    display: inline-block;
    font-size: 10px;
    padding: 2px 7px;
    background: var(--bg3);
    border: 1px solid var(--border2);
    color: var(--text);
    margin: 1px 2px;
  }

  /* ─── RECORDING QUALITY ───────────────────────────────── */
  .quality-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
  }

  .quality-row {
    display: grid;
    grid-template-columns: 180px 1fr 60px;
    align-items: center;
    gap: 16px;
    font-size: 13px;
  }

  .quality-label { color: var(--text-dim); }

  .quality-track {
    height: 6px;
    background: #282035;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
  }

  .quality-fill {
    height: 100%;
    position: relative;
  }

  .quality-fill::after {
    content: '';
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: 40px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3));
  }

  .quality-rdp-fill { background: linear-gradient(90deg, var(--rdp-color), var(--cyan-dim)); }
  .quality-pra-fill { background: linear-gradient(90deg, var(--pra-color), var(--green-dim)); }

  .quality-val {
    font-size: 11px;
    font-weight: 600;
    text-align: right;
  }

  /* ─── SCROLLBAR ───────────────────────────────────────── */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: var(--border2); }
  ::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

  /* ─── FOOTER ──────────────────────────────────────────── */
  .footer {
    border-top: 1px solid var(--border);
    padding: 28px 40px;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: gap;
    gap: 12px;
  }

  .footer-text {
    font-size: 11px;
    color: var(--text-faint);
  }

  .progress-tracker {
    display: flex;
    gap: 6px;
    align-items: center;
  }

  .progress-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--border2);
    cursor: pointer;
    transition: all 0.2s;
  }

  .progress-dot.active { background: var(--cyan); box-shadow: 0 0 6px var(--cyan); }
  .progress-dot.visited { background: var(--green-dim); }

  /* ─── RESPONSIVE ──────────────────────────────────────── */
  @media (max-width: 768px) {
    .header { padding: 36px 20px 32px; }
    .main { padding: 32px 20px 60px; }
    .nav { padding: 0 20px; }
    .compare-grid, .arch-diagram, .ux-grid { grid-template-columns: 1fr; }
    .attr-table { font-size: 12px; }
    .attr-table td, .attr-table th { padding: 10px 10px; }
    .quality-row { grid-template-columns: 140px 1fr 50px; }
    .footer { padding: 20px; }
  }

  /* ─── SUMMARY MATRIX ──────────────────────────────────── */
  .matrix-wrap { overflow-x: auto; }

  .matrix {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    min-width: 600px;
  }

  .matrix th {
    font-size: 10px;
    text-transform: uppercase;
    padding: 12px 16px;
    text-align: left;
    background: #883cf050;
    border-bottom: 2px solid var(--border2);
  }

  .matrix th:nth-child(2) { color: var(--rdp-color); border-bottom-color: var(--rdp-color); }
  .matrix th:nth-child(3) { color: var(--pra-color); border-bottom-color: var(--pra-color); }

  .matrix td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
    color: var(--text-dim);
  }

  .matrix td:first-child {
    color: var(--text);
    font-weight: 500;
    font-size: 13.5px;
  }

  .matrix tr:hover td { background: #1f1232; }

  .icon-check { color: var(--green); font-size: 14px; }
  .icon-x { color: var(--red); font-size: 14px; }
  .icon-partial { color: var(--amber); font-size: 14px; }