:root {
    --bg: #080c12;
    --surface: #0d1320;
    --surface2: #23133a;
    --surface3: #1f1232;
    --border: #3a1c63;
    --border2: #5e309d;
    --accent: #883CF0;
    --accent2: #af62c8;
    --accent3: #e95bf6;
    --green: #00e5a0;
    --green-dim: #00b07a;
    --amber: #7b5ea7;
    --amber-dim: #7b5ea79a;
    --red: #ff4d6a;
    --red-dim: #cc2244;
    --purple: #a78bfa;
    --text: #e2eaf5;
    --text2: #e9eef5;
    --text3: #ebedf0;
  }

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

  html { scroll-behavior: smooth; }

  .session-recording-training-1 {
    background: #191127;
    color: var(--text);
    font-size: 15px;
    line-height: 1.6;
    height: 100vh;
    overflow-x: hidden;
    position: relative;
    overflow-y: auto;
  }

  /* ─── GRID NOISE TEXTURE ─── */
  .session-recording-training-1::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(rgba(0,212,255,0.025) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,212,255,0.025) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
  }

  /* ─── HEADER ─── */
 .session-recording-training-1 header {
    position: sticky;
    top: 0;
    z-index: 1;
    background: #180f26;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
  }

  .header-brand {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .brand-badge {
    background: var(--accent);
    color: var(--bg);
    font-size: 10px;
    font-weight: 600;
    padding: 3px 8px;
    text-transform: uppercase;
  }

  .brand-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
    text-transform: uppercase;
  }

  .header-meta {
    display: flex;
    align-items: center;
    gap: 20px;
  }

  .progress-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 11px;
    color: var(--text3);
  }

  .progress-bar {
    width: 120px;
    height: 3px;
    background: #282035;
    position: relative;
    overflow: hidden;
  }

  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #684895);
    width: 0%;
    transition: width 0.4s ease;
  }

  /* ─── LAYOUT ─── */
  .layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - 60px);
    position: relative;
  }

  /* ─── SIDEBAR ─── */
  aside {
    border-right: 1px solid var(--border);
    padding: 2rem 0;
    position: sticky;
    top: 60px;
    height: calc(100vh - 60px);
    overflow-y: auto;
    background: #180f26;
  }

  aside::-webkit-scrollbar { width: 4px; }
  aside::-webkit-scrollbar-track { background: transparent; }
  aside::-webkit-scrollbar-thumb { background: var(--border2); }

  .nav-section-label {
    font-size: 9px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text3);
    padding: 0 1.5rem 0.5rem;
    margin-top: 1.5rem;
  }

  .nav-section-label:first-child { margin-top: 0; }

  .nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 1.5rem;
    cursor: pointer;
    transition: all 0.15s;
    border-left: 2px solid transparent;
    color: var(--text2);
    font-size: 13px;
    text-decoration: none;
  }

  .nav-item:hover { background: #23133a9f; color: var(--text); }

  .nav-item.active {
    border-left-color: var(--accent);
    background: #23133a;
    color: var(--accent);
  }

  .nav-item .nav-num {
    font-size: 10px;
    color: var(--text3);
    min-width: 18px;
  }

  .nav-item.active .nav-num { color: var(--accent2); }

  .nav-item .nav-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border2);
    flex-shrink: 0;
  }

  .nav-item.completed .nav-dot { background: var(--green); }
  .nav-item.active .nav-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }

  /* ─── MAIN ─── */
  main {
    padding: 3rem 3.5rem;
    max-width: 900px;
  }

  /* ─── MODULE HERO ─── */
  .module-hero {
    margin-bottom: 3rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border);
    animation: fadeUp 0.5s ease both;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .module-tag {
    font-size: 11px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .module-tag::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--accent);
  }

  .module-title {
    font-size: clamp(1.8rem, 3vw, 2.8rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--text);
    margin-bottom: 1rem;
  }

  .module-title span { color: var(--accent); }

  .module-desc {
    color: var(--text2);
    max-width: 640px;
    font-size: 15px;
    line-height: 1.7;
    font-weight: 300;
  }

  .module-stats {
    display: flex;
    gap: 2rem;
    margin-top: 1.5rem;
  }

  .stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .stat-val {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
  }

  .stat-label {
    font-size: 11px;
    color: var(--text3);
    text-transform: uppercase;
  }

  /* ─── SECTION ─── */
  .section {
    display: none;
    animation: fadeUp 0.4s ease both;
  }

  .section.active { display: block; }

  .section-header {
    margin-bottom: 2rem;
  }

  .section-num {
    font-size: 11px;
    color: var(--accent2);
    margin-bottom: 0.5rem;
  }

  .section-title {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.75rem;
  }

  .section-intro {
    color: var(--text2);
    font-size: 14px;
    line-height: 1.75;
    font-weight: 300;
    max-width: 680px;
  }

  /* ─── CONTENT BLOCKS ─── */
  h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    margin: 2rem 0 0.75rem;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  h3::before {
    content: '';
    width: 3px;
    height: 16px;
    background: var(--accent);
    flex-shrink: 0;
  }

  p { color: var(--text2); line-height: 1.75; margin-bottom: 1rem; font-weight: 300; }

  /* ─── INFO CARDS ─── */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
  }

  .card {
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 1.25rem;
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s;
  }

  .card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
  }

  .card.accent::before { background: var(--accent); }
  .card.green::before { background: var(--green); }
  .card.amber::before { background: var(--amber); }
  .card.red::before { background: var(--red); }
  .card.purple::before { background: var(--purple); }

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

  .card-icon {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
  }

  .card-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.4rem;
  }

  .card-body {
    font-size: 13px;
    color: var(--text2);
    line-height: 1.6;
    font-weight: 300;
  }

  /* ─── PIPELINE DIAGRAM ─── */
  .pipeline {
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 2rem;
    margin: 1.5rem 0;
    overflow-x: auto;
  }

  .pipeline-title {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 1.5rem;
  }

  .pipeline-flow {
    display: flex;
    align-items: center;
    gap: 0;
    flex-wrap: nowrap;
    min-width: 600px;
  }

  .pipe-node {
    background: var(--surface3);
    border: 1px solid var(--border2);
    padding: 0.75rem 1rem;
    text-align: center;
    flex: 1;
    min-width: 100px;
    position: relative;
  }

  .pipe-node-icon { font-size: 1.1rem; margin-bottom: 0.3rem; }

  .pipe-node-label {
    font-size: 10px;
    color: var(--text2);
    line-height: 1.4;
  }

  .pipe-arrow {
    color: var(--accent);
    font-size: 1.2rem;
    padding: 0 4px;
    flex-shrink: 0;
  }

  .pipe-node.highlight {
    border-color: var(--accent);
    background: #2a1647;
  }

  .pipe-node.highlight .pipe-node-label { color: var(--accent); }

  /* ─── CONFIG TABLE ─── */
  .config-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 13px;
  }

  .config-table th {
    background: var(--surface3);
    border: 1px solid var(--border);
    padding: 10px 14px;
    text-align: left;
    font-size: 10px;
    font-weight: 600;
    color: var(--text3);
    text-transform: uppercase;
  }

  .config-table td {
    border: 1px solid var(--border);
    padding: 10px 14px;
    color: var(--text2);
    vertical-align: top;
    font-weight: 300;
  }

  .config-table tr:hover td { background: var(--surface2); }

  .config-table td:first-child {
    font-size: 12px;
    color: var(--accent);
    white-space: nowrap;
  }

  .tag {
    display: inline-block;
    font-size: 10px;
    padding: 2px 7px;
    border-radius: 2px;
    font-weight: 500;
  }

  .tag-green { background: rgba(0,229,160,0.12); color: var(--green); }
  .tag-amber { background: rgba(232, 183, 93, 0.062); color: var(--amber); }
  .tag-red { background: rgba(255,77,106,0.12); color: var(--red); }
  .tag-blue { background: rgba(0,212,255,0.12); color: var(--accent); }

  /* ─── STEP LIST ─── */
  .steps {
    margin: 1.5rem 0;
    counter-reset: steps;
  }

  .step {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.25rem;
    padding: 1rem 1.25rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent3);
    transition: border-left-color 0.2s;
  }

  .step:hover { border-left-color: var(--accent); }

  .step-num {
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    min-width: 24px;
    padding-top: 2px;
  }

  .step-content { flex: 1; }

  .step-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.3rem;
  }

  .step-body {
    font-size: 13px;
    color: var(--text2);
    line-height: 1.65;
    font-weight: 300;
  }

  /* ─── CODE BLOCK ─── */
  .code-block {
    background: #050810;
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent3);
    padding: 1.25rem 1.5rem;
    margin: 1rem 0;
    overflow-x: auto;
    position: relative;
  }

  .code-block-label {
    font-size: 9px;
    color: var(--text3);
    text-transform: uppercase;
    margin-bottom: 0.75rem;
  }

  .code-block code {
    font-size: 12px;
    color: var(--text2);
    line-height: 1.8;
    white-space: pre;
  }

  .code-block code .k { color: var(--accent); }
  .code-block code .v { color: var(--green); }
  .code-block code .c { color: var(--text3); font-style: italic; }

  /* ─── CALLOUT ─── */
  .callout {
    display: flex;
    gap: 1rem;
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    border: 1px solid;
    font-size: 13px;
    line-height: 1.65;
    font-weight: 300;
  }

  .callout-icon { font-size: 1rem; flex-shrink: 0; padding-top: 1px; }
  .callout-body { color: var(--text2); }
  .callout-body strong { font-weight: 600; display: block; margin-bottom: 0.25rem; }

  .callout.info { background: #1f1232; border-color: #3a1c63; }
  .callout.warn { background: rgba(255,184,48,0.04); border-color: rgba(255,184,48,0.25); }
  .callout.danger { background: rgba(255,77,106,0.04); border-color: rgba(255,77,106,0.25); }
  .callout.success { background: #23133a; border-color: #5e309d; }

  /* ─── INTERACTIVE QUIZ ─── */
  .quiz {
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 1.75rem;
    margin: 2rem 0;
  }

  .quiz-label {
    font-size: 9px;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 0.75rem;
  }

  .quiz-question {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1.25rem;
    line-height: 1.4;
  }

  .quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
  }

  .quiz-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.15s;
    font-size: 13px;
    color: var(--text2);
    font-weight: 300;
    background: var(--surface3);
  }

  .quiz-option:hover { border-color: var(--accent2); color: var(--text); }
  .quiz-option .opt-letter {
    font-size: 11px;
    font-weight: 600;
    color: var(--text3);
    min-width: 20px;
  }

  .quiz-option.correct { border-color: var(--green); background: rgba(0,229,160,0.06); color: var(--green); }
  .quiz-option.correct .opt-letter { color: var(--green); }
  .quiz-option.wrong { border-color: var(--red); background: rgba(255,77,106,0.06); color: var(--red-dim); }
  .quiz-option.wrong .opt-letter { color: var(--red); }

  .quiz-feedback {
    margin-top: 1rem;
    font-size: 13px;
    padding: 0.75rem 1rem;
    display: none;
    border: 1px solid;
    line-height: 1.6;
    font-weight: 300;
  }

  .quiz-feedback.show { display: block; }
  .quiz-feedback.correct { border-color: rgba(0,229,160,0.3); color: var(--green); background: rgba(0,229,160,0.04); }
  .quiz-feedback.wrong { border-color: rgba(255,77,106,0.3); color: var(--red); background: rgba(255,77,106,0.04); }

  /* ─── TOGGLE DEMO ─── */
  .demo-panel {
    background: var(--surface2);
    border: 1px solid var(--border);
    margin: 1.5rem 0;
    overflow: hidden;
  }

  .demo-header {
    background: var(--surface3);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .demo-title {
    font-size: 11px;
    color: var(--text2);
  }

  .demo-dots { display: flex; gap: 5px; }
  .demo-dot { width: 8px; height: 8px; border-radius: 50%; }
  .demo-dot:nth-child(1) { background: var(--red-dim); }
  .demo-dot:nth-child(2) { background: var(--amber-dim); }
  .demo-dot:nth-child(3) { background: var(--green-dim); }

  .demo-body { padding: 1.5rem; }

  .config-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    gap: 1rem;
  }

  .config-row:last-child { border-bottom: none; }

  .config-row-left { flex: 1; }

  .config-row-label {
    font-size: 13px;
    color: var(--text);
    font-weight: 400;
    margin-bottom: 2px;
  }

  .config-row-hint {
    font-size: 10px;
    color: var(--text3);
  }

  /* Toggle switch */
  .toggle {
    position: relative;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
  }

  .toggle input { opacity: 0; width: 0; height: 0; }

  .toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--border2);
    transition: 0.3s;
    border-radius: 22px;
  }

  .toggle-slider::before {
    content: '';
    position: absolute;
    width: 16px; height: 16px;
    left: 3px; top: 3px;
    background: var(--text3);
    transition: 0.3s;
    border-radius: 50%;
  }

  .toggle input:checked + .toggle-slider { background: var(--accent); }
  .toggle input:checked + .toggle-slider::before {
    transform: translateX(18px);
    background: var(--bg);
  }

  .config-select {
    background: var(--surface3);
    border: 1px solid var(--border);
    color: var(--text2);
    font-size: 12px;
    padding: 6px 10px;
    outline: none;
    cursor: pointer;
    min-width: 140px;
    transition: border-color 0.15s;
  }

  .config-select:hover, .config-select:focus { border-color: var(--accent2); }

  .config-input {
    background: var(--surface3);
    border: 1px solid var(--border);
    color: var(--text2);
    font-size: 12px;
    padding: 6px 10px;
    outline: none;
    width: 100px;
    transition: border-color 0.15s;
  }

  .config-input:hover, .config-input:focus { border-color: var(--accent2); }

  /* ─── NAV BUTTONS ─── */
  .section-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
  }

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    padding: 10px 20px;
    cursor: pointer;
    border: 1px solid;
    transition: all 0.15s;
    text-decoration: none;
  }

  .btn-primary {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
  }

  .btn-primary:hover { background: transparent; color: var(--accent); }

  .btn-secondary {
    background: transparent;
    color: var(--text2);
    border-color: var(--border2);
  }

  .btn-secondary:hover { border-color: var(--text2); color: var(--text); }

  .btn:disabled { opacity: 0.3; cursor: not-allowed; pointer-events: none; }

  .section-counter {
    font-size: 11px;
    color: var(--text3);
  }

  /* ─── CHECKLIST ─── */
  .checklist { margin: 1.5rem 0; }

  .check-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: color 0.15s;
  }

  .check-item:last-child { border-bottom: none; }

  .check-box {
    width: 16px; height: 16px;
    border: 1px solid var(--border2);
    flex-shrink: 0;
    margin-top: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
  }

  .check-item:hover .check-box { border-color: var(--accent); }
  .check-item.done .check-box { background: var(--green); border-color: var(--green); }
  .check-item.done .check-box::after { content: '✓'; color: var(--bg); font-size: 10px; font-weight: 700; }

  .check-text {
    font-size: 13px;
    color: var(--text2);
    font-weight: 300;
    line-height: 1.5;
  }

  .check-item.done .check-text { text-decoration: line-through; color: var(--text3); }

  /* ─── ARCHITECTURE SVG ─── */
  .arch-diagram {
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 1.5rem;
    margin: 1.5rem 0;
  }

  /* ─── RESPONSIVE ─── */
  @media (max-width: 768px) {
    .layout { grid-template-columns: 1fr; }
    aside { display: none; }
    main { padding: 2rem 1.5rem; }
  }

    /* SCROLLBAR */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: #873cf015; }
  ::-webkit-scrollbar-thumb { background: #873cf015; border-radius: 3px; }