:root {
    --bg: #23133a;
    --surface: #23133a;
    --surface2: #2b1f3d;
    --surface3: #1f1232;
    --border: #3a1c63;
    --border-bright: #5e309d;
    --accent: #883CF0;
    --accent2: #883CF0;
    --accent3: #883CF0;
    --warn: #ffcc00;
    --danger: #ff3b3b;
    --text: #883CF0;
    --text-dim: #d6d6d6;
    --text-bright: #e8f4ff;
    --grid-line: rgba(225, 0, 255, 0.04);
  }

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

  .ad-discovery-training {
    color: var(--text);
    font-size: 15px;
    line-height: 1.6;
    height: 100vh;
    overflow-y: auto;
    background-color: #191127;
  }

  /* ── TOP BAR ── */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 1;
    background: #180f26;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    height: 52px;
  }
  .topbar-brand {
    font-size: 11px;
    color: var(--text-dim);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .topbar-brand::before {
    content: '';
    width: 8px; height: 8px;
    background: var(--accent3);
    border-radius: 50%;
    animation: pulse 2s infinite;
  }
  .topbar-progress {
    display: flex;
    align-items: center;
    gap: 12px;
   
    font-size: 11px;
    color: var(--text-dim);
  }
  .progress-bar {
    width: 160px;
    height: 3px;
    background: #282035;
    border-radius: 2px;
    overflow: hidden;
  }
  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent3));
    border-radius: 2px;
    width: 0%;
    transition: width 0.5s ease;
  }

  /* ── HERO ── */
  .hero {
    padding: 80px 32px 60px;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
  }

  .module-tag {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 4px 12px;
    margin-bottom: 24px;
    position: relative;
  }
  .module-tag::before {
    content: '//';
    margin-right: 6px;
    opacity: 0.6;
  }
  h1 {
    
    font-size: clamp(48px, 7vw, 88px);
    line-height: 0.95;
    color: var(--text-bright);
    margin-bottom: 8px;
  }
  h1 span { color: var(--accent); }
  .hero-sub {
    font-size: 13px;
    color: var(--text-dim);
    margin-top: 20px;
    max-width: 600px;
    line-height: 1.8;
  }
  .hero-meta {
    display: flex;
    gap: 32px;
    margin-top: 40px;
    flex-wrap: wrap;
  }
  .meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .meta-label {
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
  }
  .meta-value {
   
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
  }

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

  /* ── NAV TABS ── */
  .nav-tabs {
    position: sticky;
    top: 52px;
    z-index: 1;
    background: #191127;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 0 32px;
  }
  .nav-tabs::-webkit-scrollbar { display: none; }
  .nav-tab {
    padding: 14px 20px;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    color: var(--text-dim);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    transition: all 0.2s;
    user-select: none;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
  }
  .nav-tab:hover { color: var(--text); border-bottom-color: var(--border-bright); }
  .nav-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
  .tab-num {
    display: inline-block;
    width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    font-size: 10px;
    background: var(--surface2);
    border-radius: 3px;
    margin-right: 8px;
    color: var(--text-dim);
  }
  .nav-tab.active .tab-num { background: #ffffff; color: var(--accent); }

  /* ── MAIN CONTENT ── */
  main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px 80px;
    background-color: #191127;
  }

  .section {
    display: none;
    animation: fadeUp 0.4s ease both;
  }
  .section.active { display: block; }

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

  .section-header {
    padding: 48px 0 32px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
  }
  .section-header h2 {
    font-size: clamp(32px, 4vw, 52px);
    line-height: 1;
    color: var(--text-bright);
  }
  .section-header h2 em {
    font-style: normal;
    color: var(--accent2);
  }
  .section-objective {
    max-width: 400px;
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.7;
    padding: 16px;
    border: 1px solid var(--border);
    background: var(--surface);
    position: relative;
  }
  .section-objective::before {
    content: 'OBJECTIVE';
    font-size: 9px;
    color: var(--accent);
    display: block;
    margin-bottom: 8px;
  }

  /* ── CARDS ── */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
  }
  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 24px;
    position: relative;
    transition: border-color 0.2s;
  }
  .card:hover { border-color: var(--border-bright); }
  .card-corner {
    position: absolute;
    top: -1px; right: -1px;
    width: 24px; height: 24px;
    border-top: 2px solid var(--accent);
    border-right: 2px solid var(--accent);
  }
  .card-icon {
    font-size: 28px;
    margin-bottom: 16px;
    display: block;
  }
  .card h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 8px;
    text-transform: uppercase;
  }
  .card p {
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.7;
  }
  .card-accent { border-left: 3px solid var(--accent2); }
  .card-warn { border-left: 3px solid var(--warn); }
  .card-danger { border-left: 3px solid var(--danger); }
  .card-ok { border-left: 3px solid var(--accent3); }

  /* ── CODE BLOCKS ── */
  .code-block {
    background: #050709;
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    padding: 0;
    margin: 24px 0;
    position: relative;
    overflow: hidden;
  }
  .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
  }
  .code-label {
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
  }
  .copy-btn {
    font-size: 10px;
    color: var(--accent);
    background: #1f1232;
    border: 1px solid #3a1c63;
    padding: 4px 10px;
    cursor: pointer;
    transition: all 0.15s;
    text-transform: uppercase;
  }
  .copy-btn:hover { background: #2a1647; }
  .copy-btn.copied { color: var(--accent3); border-color: var(--accent3); background: #1f1232; }
  pre {
   
    font-size: 12.5px;
    line-height: 1.8;
    padding: 20px 20px;
    overflow-x: auto;
    color: var(--text);
  }
  pre .cmd { color: var(--accent); }
  pre .flag { color: var(--accent2); }
  pre .str { color: var(--accent3); }
  pre .comment { color: var(--text-dim); font-style: italic; }
  pre .kw { color: var(--warn); }
  pre .out { color: #888; }

  /* ── STEP LIST ── */
  .steps {
    counter-reset: step-counter;
    display: flex;
    flex-direction: column;
    gap: 0;
    margin: 24px 0;
  }
  .step {
    counter-increment: step-counter;
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 0;
    position: relative;
  }
  .step:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 25px;
    top: 52px;
    bottom: 0;
    width: 1px;
    background: var(--border);
  }
  .step-num {
    display: flex;
    align-items: flex-start;
    padding-top: 14px;
  }
  .step-num::after {
    content: counter(step-counter, decimal-leading-zero);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
   
    font-size: 11px;
    font-weight: 600;
    background: var(--surface2);
    border: 1px solid var(--border-bright);
    color: var(--accent);
    flex-shrink: 0;
  }
  .step-content {
    padding: 14px 0 32px 20px;
  }
  .step-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-bright);
    margin-bottom: 8px;
    text-transform: uppercase;
  }
  .step p {
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.7;
  }

  /* ── TABLE ── */
  .data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
   
    font-size: 12px;
  }
  .data-table thead tr {
    background: var(--surface2);
    border-bottom: 2px solid var(--border-bright);
  }
  .data-table th {
    padding: 12px 16px;
    text-align: left;
    color: var(--text-dim);
    font-size: 10px;
    text-transform: uppercase;
    font-weight: 600;
  }
  .data-table td {
    padding: 11px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: top;
  }
  .data-table tr:hover td { background: var(--surface); }
  .badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 600;
    border-radius: 2px;
    text-transform: uppercase;
  }
  .badge-high { background: rgba(255,59,59,0.15); color: var(--danger); border: 1px solid rgba(255,59,59,0.3); }
  .badge-med { background: rgba(255,204,0,0.12); color: var(--warn); border: 1px solid rgba(255,204,0,0.25); }
  .badge-low { background: rgba(57,255,20,0.1); color: var(--accent3); border: 1px solid rgba(57,255,20,0.2); }
  .badge-info { background: #1f1232; color: var(--accent); border: 1px solid #3a1c63; }

  /* ── CALLOUT ── */
  .callout {
    padding: 18px 20px;
    border-left: 3px solid;
    margin: 24px 0;
    display: flex;
    gap: 14px;
    align-items: flex-start;
    background: var(--surface);
  }
  .callout.warn { border-color: var(--warn); }
  .callout.danger { border-color: var(--danger); }
  .callout.info { border-color: var(--accent); }
  .callout.tip { border-color: var(--accent3); }
  .callout-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
  .callout-text { font-size: 13px; line-height: 1.7; }
  .callout-text strong {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    margin-bottom: 4px;
  }
  .callout.warn .callout-text strong { color: var(--warn); }
  .callout.danger .callout-text strong { color: var(--danger); }
  .callout.info .callout-text strong { color: var(--accent); }
  .callout.tip .callout-text strong { color: var(--accent3); }

  /* ── QUIZ ── */
  .quiz-block {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 28px;
    margin: 32px 0;
    position: relative;
  }
  .quiz-block::before {
    content: 'KNOWLEDGE CHECK';
    font-size: 9px;
    color: var(--accent2);
    display: block;
    margin-bottom: 16px;
  }
  .quiz-q {
    font-size: 15px;
    color: var(--text-bright);
    margin-bottom: 20px;
    line-height: 1.5;
    font-weight: 500;
  }
  .quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
  }
  .quiz-opt {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    background: #1f1232;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.15s;
    font-size: 13px;
    color: var(--text);
    text-align: left;
    border-radius: 0;
    width: 100%;
  }
  .quiz-opt:hover:not(.answered) { border-color: var(--border-bright); background: #2a1647; }
  .quiz-opt .opt-letter {
   
    font-size: 11px;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface3);
    border: 1px solid var(--border-bright);
    color: var(--text-dim);
    flex-shrink: 0;
    margin-top: 1px;
  }
  .quiz-opt.correct { border-color: #77b255; background: #77b25520; }
  .quiz-opt.correct .opt-letter { background: rgba(57,255,20,0.2); color: var(--accent3); border-color: var(--accent3); }
  .quiz-opt.wrong { border-color: #dc143c; background: #dc143c2b; opacity: 0.6; }
  .quiz-feedback {
    display: none;
    font-size: 13px;
    padding: 12px 16px;
    border-left: 3px solid var(--accent3);
    background: rgba(57,255,20,0.05);
    color: var(--text);
    line-height: 1.7;
    margin-top: 8px;
  }
  .quiz-feedback.show { display: block; }
  .quiz-feedback.wrong-fb { border-color: var(--danger); background: rgba(255,59,59,0.05); }

  /* ── INVENTORY BUILDER ── */
  .inventory-tool {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 28px;
    margin: 32px 0;
  }
  .inv-header {
    font-size: 11px;
    color: var(--accent2);
    text-transform: uppercase;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .inv-header::before {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
  }
  .inv-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
  }
  .form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }
  .form-group.full { grid-column: 1 / -1; }
  label {
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
  }
  input, select, textarea {
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text);
   
    font-size: 12px;
    padding: 8px 12px;
    outline: none;
    transition: border-color 0.15s;
  }
  input:focus, select:focus, textarea:focus { border-color: var(--accent); }
  select option { background: var(--surface2); }
  .btn {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    padding: 10px 20px;
    cursor: pointer;
    border: 1px solid;
    transition: all 0.15s;
  }
  .btn-primary {
    background: #180f26;
    border-color: var(--accent);
    color: var(--accent);
  }
  .btn-primary:hover { background: #180f26; }
  .btn-danger {
    background: #1f1232;
    border-color: var(--danger);
    color: var(--danger);
  }
  .btn-danger:hover { background: #2a1647; }
  .btn-sm { padding: 4px 10px; font-size: 10px; }

  .inv-table-wrap { overflow-x: auto; }
  #inv-count {
   
    font-size: 11px;
    color: var(--text-dim);
    margin-bottom: 12px;
  }
  #inv-count span { color: var(--accent); }
  .empty-state {
    text-align: center;
    padding: 40px;
   
    font-size: 12px;
    color: var(--text-dim);
    border: 1px dashed var(--border);
    margin-top: 16px;
  }

  /* ── DELINEA CONFIG ── */
  .config-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    margin: 24px 0;
    overflow: hidden;
  }
  .config-tab-bar {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
  }
  .config-tab {
    padding: 10px 18px;
    font-size: 11px;
    color: var(--text-dim);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    text-transform: uppercase;
    transition: all 0.15s;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
  }
  .config-tab:hover { color: var(--text); }
  .config-tab.active { color: var(--accent2); border-bottom-color: var(--accent2); }
  .config-pane { display: none; padding: 24px; }
  .config-pane.active { display: block; }
  .config-row {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    align-items: start;
  }
  .config-key {
   
    font-size: 12px;
    color: var(--text-dim);
  }
  .config-val {
   
    font-size: 12px;
    color: var(--accent3);
  }
  .config-desc {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 4px;
    line-height: 1.5;
  }

  /* ── CHECKLIST ── */
  .checklist {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin: 24px 0;
    border: 1px solid var(--border);
  }
  .check-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.15s;
    user-select: none;
  }
  .check-item:last-child { border-bottom: none; }
  .check-item:hover { background: var(--surface); }
  .check-box {
    width: 20px;
    height: 20px;
    border: 1px solid var(--border-bright);
    background: var(--surface2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
    transition: all 0.15s;
  }
  .check-item.checked .check-box {
    background: #1f1232;
    border-color: var(--accent3);
    color: var(--accent3);
  }
  .check-item.checked .check-label { text-decoration: line-through; color: var(--text-dim); }
  .check-label {
    font-size: 13px;
    color: var(--text);
    line-height: 1.5;
    flex: 1;
  }
  .check-category {
    font-size: 9px;
    color: var(--text-dim);
    flex-shrink: 0;
    text-transform: uppercase;
    width: 90px;
    text-align: right;
  }
  .checklist-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: none;
   
    font-size: 11px;
    color: var(--text-dim);
  }
  .check-count { color: var(--accent); }

  /* ── ACCORDION ── */
  .accordion { margin: 24px 0; }
  .acc-item {
    border: 1px solid var(--border);
    margin-bottom: -1px;
  }
  .acc-trigger {
    width: 100%;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface);
    cursor: pointer;
    text-align: left;
    border: none;
    transition: background 0.15s;
  }
  .acc-trigger:hover { background: var(--surface2); }
  .acc-trigger-text {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-bright);
    text-transform: uppercase;
  }
  .acc-arrow {
   
    font-size: 14px;
    color: var(--text-dim);
    transition: transform 0.2s;
  }
  .acc-item.open .acc-arrow { transform: rotate(90deg); color: var(--accent); }
  .acc-body {
    display: none;
    padding: 20px;
    border-top: 1px solid var(--border);
    background: var(--bg);
  }
  .acc-item.open .acc-body { display: block; }

  /* ── FLOW DIAGRAM ── */
  .flow-diagram {
    display: flex;
    align-items: center;
    gap: 0;
    margin: 32px 0;
    overflow-x: auto;
    padding-bottom: 8px;
  }
  .flow-node {
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 16px 18px;
    min-width: 140px;
    text-align: center;
    flex-shrink: 0;
    position: relative;
  }
  .flow-node.highlight { border-color: var(--accent); background: #1f1232; }
  .flow-node.warn { border-color: var(--warn); background: rgba(255,204,0,0.04); }
  .flow-node.danger { border-color: var(--danger); background: rgba(255,59,59,0.04); }
  .flow-node .fn-icon { font-size: 22px; margin-bottom: 8px; }
  .flow-node .fn-label {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--text-dim);
    line-height: 1.4;
  }
  .flow-arrow {
   
    color: var(--border-bright);
    font-size: 16px;
    padding: 0 4px;
    flex-shrink: 0;
  }

  /* ── ANIMATIONS ── */
  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
  }

  /* ── RESPONSIVE ── */
  @media (max-width: 700px) {
    .topbar{
      flex-direction: column;
      height: auto;
    }

    .hero { padding: 50px 16px 40px; }
    .nav-tabs { padding: 0 16px; }
    main { padding: 0 16px 60px; }
    .inv-form { grid-template-columns: 1fr; }
    .config-row { grid-template-columns: 1fr; }
    .flow-diagram { flex-direction: column; align-items: flex-start; }
    .flow-arrow { transform: rotate(90deg); }
    h1 { font-size: 40px; }
  }

  /* ── SECTION: OVERVIEW ── */
  .risk-meter {
    display: flex;
    gap: 4px;
    align-items: center;
    margin: 32px 0;
  }
  .risk-seg {
    flex: 1;
    height: 8px;
    background: var(--surface3);
    transition: background 0.3s;
    border-radius: 1px;
  }
  .risk-seg.fill-green { background: var(--accent3); }
  .risk-seg.fill-yellow { background: var(--warn); }
  .risk-seg.fill-orange { background: var(--accent2); }
  .risk-seg.fill-red { background: var(--danger); }

  .stat-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin: 32px 0;
  }
  .stat-box {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 20px;
    text-align: center;
  }
  .stat-num {
    
    font-size: 44px;
    line-height: 1;
    color: var(--accent);
    display: block;
  }
  .stat-num.orange { color: var(--accent2); }
  .stat-num.red { color: var(--danger); }
  .stat-num.green { color: var(--accent3); }
  .stat-lbl {
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-top: 8px;
    display: block;
  }

  textarea { width: 100%; resize: vertical; min-height: 80px; }