:root {
    --navy: #071828;
    --navy-mid: #0d2233;
    --navy-light: #142d42;
    --teal: #883CF0;
    --teal-dim: #883CF0;
    --teal-glow: #23133a;
    --mint: #1f1232;
    --ice: #ddeff1;
    --white: #f0fafc;
    --muted: #d6d6d6;
    --danger: #ff5c6a;
    --warn: #ffa940;
    --success: #00d9a3;
    --border: #3a1c63;
  }

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

  html { scroll-behavior: smooth; }

  .strongdm-training-guide-3 {
    color: var(--white);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
  }

  /* ── SIDEBAR ── */
  .sidebar {
    width: 280px;
    min-width: 280px;
    background: #180f26;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0; left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 1;
  }

  .sidebar::-webkit-scrollbar { width: 4px; }
  .sidebar::-webkit-scrollbar-track { background: transparent; }
  .sidebar::-webkit-scrollbar-thumb { background: #873cf015; border-radius: 2px; }

  .sidebar-logo {
    padding: 28px 24px 20px;
    border-bottom: 1px solid var(--border);
  }

  .logo-wordmark {
   
    font-weight: 800;
    font-size: 20px;
    color: var(--white);
  }

  .logo-wordmark span { color: var(--teal); }

  .logo-sub {
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    margin-top: 4px;
    font-weight: 500;
  }

  .progress-ring-wrap {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
  }

  .progress-label {
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 10px;
    font-weight: 500;
  }

  .progress-bar-bg {
    height: 4px;
    background: #282035;
    border-radius: 2px;
    overflow: hidden;
  }

  .progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--teal), var(--mint));
    border-radius: 2px;
    transition: width 0.5s ease;
    width: 0%;
  }

  .progress-pct {
    
    font-size: 12px;
    color: var(--teal);
    margin-top: 6px;
    text-align: right;
  }

  .nav-section {
    padding: 16px 24px 6px;
    font-size: 10px;
    color: var(--muted);
    text-transform: uppercase;
    font-weight: 600;
  }

  .nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 24px;
    font-size: 13.5px;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    font-weight: 400;
  }

  .nav-item:hover { color: var(--ice); background: var(--teal-glow); }

  .nav-item.active {
    color: var(--teal);
    border-left-color: var(--teal);
    background: var(--teal-glow);
    font-weight: 500;
  }

  .nav-item.completed { color: var(--success); }
  .nav-item.completed::after { content: '✓'; margin-left: auto; font-size: 12px; }

  .nav-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
    opacity: 0.5;
  }

  .nav-item.active .nav-dot, .nav-item.completed .nav-dot { opacity: 1; }

  /* ── MAIN CONTENT ── */
  .main {
    /* margin-left: 280px; */
    flex: 1;
    height: 100vh;
    overflow-y:auto;
    background-color: #191127;
  }

  .strongdm-training-guide-3 .page { display: none; }
  .page.active { display: block; animation: fadeIn 0.4s ease; }

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

  .page-hero {
    background: linear-gradient(135deg, #1f1232 0%, #be52e50f 100%);
    border-bottom: 1px solid var(--border);
    padding: 60px 64px 48px;
    position: relative;
    overflow: hidden;
  }

  .page-hero::before {
    content: '';
    position: absolute;
    top: -80px; right: -80px;
    width: 320px; height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, #be52e50f 0%, transparent 70%);
    pointer-events: none;
  }

  .hero-tag {
    display: inline-block;
    
    font-size: 11px;
    color: var(--teal);
    border: 1px solid var(--teal-dim);
    padding: 4px 12px;
    border-radius: 2px;
    margin-bottom: 20px;
  }

  .hero-title {
    
    font-size: 44px;
    font-weight: 800;
    line-height: 1.05;
    color: var(--white);
    margin-bottom: 16px;
  }

  .hero-title em { color: var(--teal); font-style: normal; }

  .hero-desc {
    font-size: 16px;
    color: var(--muted);
    max-width: 560px;
    line-height: 1.7;
    font-weight: 300;
  }

  .hero-meta {
    display: flex;
    gap: 24px;
    margin-top: 28px;
  }

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

  .meta-chip::before {
    content: '';
    display: inline-block;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--teal);
  }

  .content-body { padding: 52px 64px; }

  /* ── SECTION COMPONENTS ── */
  .section-title {
    
    font-size: 26px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
  }

  .section-sub {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 32px;
    font-weight: 300;
    line-height: 1.6;
  }

  .card {
    background: #23133a;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 28px 32px;
    margin-bottom: 20px;
    transition: border-color 0.2s;
  }

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

  .card-title {
    
    font-size: 16px;
    font-weight: 700;
    color: var(--teal);
    margin-bottom: 10px;
  }

  .card p {
    font-size: 14px;
    color: #c9d1d5;
    line-height: 1.75;
  }

  .card ul {
    list-style: none;
    margin-top: 10px;
  }

  .card ul li {
    font-size: 14px;
    color: #c9d1d5;
    line-height: 1.7;
    padding: 3px 0 3px 18px;
    position: relative;
  }

  .card ul li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--teal);
    font-size: 16px;
    line-height: 1.6;
  }

  /* ── FLOW DIAGRAM ── */
  .flow-diagram {
    display: flex;
    align-items: center;
    gap: 0;
    margin: 32px 0;
    overflow-x: auto;
    padding-bottom: 8px;
    max-width:75vw;
  }

  .flow-step {
    background: #2a1647;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px 20px;
    text-align: center;
    min-width: 140px;
    flex-shrink: 0;
    position: relative;
    cursor: pointer;
    transition: all 0.25s;
  }

  .flow-step:hover, .flow-step.highlight {
    background: var(--teal-glow);
    border-color: var(--teal);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px #be52e50f;
  }

  .flow-step-num {
    
    font-size: 10px;
    color: var(--teal);
    margin-bottom: 6px;
    text-transform: uppercase;
  }

  .flow-step-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--ice);
    line-height: 1.4;
  }

  .flow-arrow {
    color: var(--teal-dim);
    font-size: 22px;
    padding: 0 8px;
    flex-shrink: 0;
  }

  .flow-desc {
    background: var(--teal-glow);
    border: 1px solid var(--teal-dim);
    border-radius: 6px;
    padding: 16px 20px;
    margin-top: 16px;
    font-size: 13.5px;
    color: var(--ice);
    line-height: 1.6;
    display: none;
    animation: slideDown 0.25s ease;
  }

  .flow-desc.visible { display: block; }

  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .flow-hint {
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 12px;
    font-style: italic;
  }

  /* ── CODE BLOCK ── */
  .code-block {
    background: #0f0818;
    border: 1px solid #3a1c63;
    border-radius: 8px;
    overflow: hidden;
    margin: 20px 0;
    
  }

  .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 18px;
    border-bottom: 1px solid #3a1c63;
    background: rgba(0,0,0,0.3);
  }

  .code-lang {
    font-size: 11px;
    color: var(--teal);
    text-transform: uppercase;
  }

  .code-copy {
    font-size: 11px;
    color: var(--muted);
    cursor: pointer;
    transition: color 0.2s;
    border: none;
    background: none;
    
  }

  .code-copy:hover { color: var(--teal); }

  .code-body {
    padding: 20px 24px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.8;
  }

  .kw { color: #00c2d4; font-weight: 600; }
  .kw2 { color: #ff79c6; }
  .str { color: #a0ffe6; }
  .cmt { color: #3d6a7a; font-style: italic; }
  .var { color: #f8f8f2; }
  .op { color: #ff5c6a; }

  /* ── ACCORDION ── */
  .accordion-item {
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 10px;
    overflow: hidden;
    transition: border-color 0.2s;
  }

  .accordion-item.open { border-color: var(--teal-dim); }

  .accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    cursor: pointer;
    background: #23133a;
    transition: background 0.2s;
    user-select: none;
  }

  .accordion-header:hover { background: #1f1232; }

  .accordion-title {
    
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .acc-icon {
    width: 28px; height: 28px;
    border-radius: 6px;
    background: #23133a;
    border: 1px solid #3a1c63;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
  }

  .accordion-chevron {
    color: var(--muted);
    font-size: 18px;
    transition: transform 0.3s;
  }

  .accordion-item.open .accordion-chevron { transform: rotate(180deg); color: var(--teal); }

  .accordion-body {
    display: none;
    padding: 0 24px 20px;
    background: #23133a;
    font-size: 14px;
    color: #c9d1d5;
    line-height: 1.75;
    border-top: 1px solid var(--border);
    padding-top: 20px;
  }

  .accordion-item.open .accordion-body { display: block; animation: slideDown 0.2s ease; }

  /* ── GRID ── */
  .grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 24px 0;
  }

  .grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
    margin: 24px 0;
  }

  /* ── CALLOUT ── */
  .callout {
    border-radius: 6px;
    padding: 16px 20px;
    margin: 20px 0;
    display: flex;
    gap: 14px;
    align-items: flex-start;
    font-size: 13.5px;
    line-height: 1.7;
  }

  .callout-note { background: #1f1232; border-left: 3px solid var(--teal); color: var(--ice); }
  .callout-warn { background: rgba(255,169,64,0.08); border-left: 3px solid var(--warn); color: #ffd4a0; }
  .callout-danger { background: rgba(255,92,106,0.08); border-left: 3px solid var(--danger); color: #ffc0c5; }
  .callout-success { background: rgba(0,217,163,0.08); border-left: 3px solid var(--success); color: #a0ffe6; }

  .callout-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }

  /* ── QUIZ ── */
  .quiz-section {
    background: #23133a;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 32px;
    margin: 32px 0;
  }

  .quiz-label {
    
    font-size: 10px;
    color: var(--teal);
    text-transform: uppercase;
    margin-bottom: 12px;
  }

  .quiz-q {
    
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
    line-height: 1.4;
  }

  .quiz-options { display: flex; flex-direction: column; gap: 10px; }

  .quiz-opt {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 14px 18px;
    cursor: pointer;
    font-size: 14px;
    color: #c9d1d5;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .quiz-opt:hover:not(.answered) { border-color: var(--teal-dim); color: var(--ice); background: #1f1232; }
  .quiz-opt.correct { border-color: var(--success); background: rgba(0,217,163,0.1); color: var(--success); }
  .quiz-opt.wrong { border-color: var(--danger); background: rgba(255,92,106,0.1); color: var(--danger); }

  .opt-letter {
    width: 26px; height: 26px;
    border-radius: 50%;
    border: 1px solid currentColor;
    display: flex; align-items: center; justify-content: center;
    
    font-size: 11px;
    flex-shrink: 0;
    opacity: 0.7;
  }

  .quiz-feedback {
    margin-top: 16px;
    font-size: 14px;
    line-height: 1.6;
    display: none;
    padding: 14px 18px;
    border-radius: 6px;
  }

  .quiz-feedback.show { display: block; animation: slideDown 0.2s ease; }
  .quiz-feedback.correct-fb { background: rgba(0,217,163,0.1); color: #a0ffe6; border: 1px solid rgba(0,217,163,0.3); }
  .quiz-feedback.wrong-fb { background: rgba(255,92,106,0.1); color: #ffc0c5; border: 1px solid rgba(255,92,106,0.3); }

  /* ── PILL / BADGE ── */
  .pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 100px;
    font-weight: 500;
  }

  .pill-teal { background: rgba(0,194,212,0.15); color: var(--teal); border: 1px solid var(--teal-dim); }
  .pill-success { background: rgba(0,217,163,0.15); color: var(--success); border: 1px solid rgba(0,217,163,0.3); }
  .pill-danger { background: rgba(255,92,106,0.15); color: var(--danger); border: 1px solid rgba(255,92,106,0.3); }
  .pill-warn { background: rgba(255,169,64,0.15); color: var(--warn); border: 1px solid rgba(255,169,64,0.3); }

  /* ── TABLE ── */
  .data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    margin: 20px 0;
  }

  .data-table th {
    text-align: left;
    padding: 12px 18px;
    
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
  }

  .data-table td {
    padding: 14px 18px;
    color: #c9d1d5;
    border-bottom: 1px solid #3a1c63;
    line-height: 1.5;
    vertical-align: top;
  }

  .data-table tr:last-child td { border-bottom: none; }
  .data-table tr:hover td { background: var(--teal-glow); }

  .data-table td:first-child { color: var(--ice); font-weight: 500; }

  /* ── STEP LIST ── */
  .step-list { margin: 24px 0; }

  .step-item {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    align-items: flex-start;
  }

  .step-num {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--teal-glow);
    border: 1px solid var(--teal-dim);
    display: flex; align-items: center; justify-content: center;
    
    font-size: 13px;
    font-weight: 600;
    color: var(--teal);
    flex-shrink: 0;
    margin-top: 2px;
  }

  .step-content h4 {
    
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 6px;
  }

  .step-content p {
    font-size: 14px;
    color: #7a9faf;
    line-height: 1.7;
  }

  /* ── BUTTONS ── */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    
    font-size: 14px;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
  }

  .btn-primary {
    background: var(--teal);
    color: var(--navy);
  }

  .btn-primary:hover { background: #883cf0e0; transform: translateY(-1px); box-shadow: 0 6px 20px #be52e50f; }

  .btn-ghost {
    background: transparent;
    color: var(--teal);
    border: 1px solid var(--teal-dim);
  }

  .btn-ghost:hover { background: var(--teal-glow); border-color: var(--teal); }

  .page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 32px 64px;
    border-top: 1px solid var(--border);
    margin-top: 32px;
  }

  .page-nav-info {
    
    font-size: 12px;
    color: var(--muted);
  }

  /* ── DIVIDER ── */
  .divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 40px 0;
  }

  /* ── USE CASE CARD ── */
  .use-case {
    background: var(--navy-light);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 24px;
    transition: border-color 0.2s;
  }

  .use-case:hover { border-color: var(--teal-dim); }

  .use-case-header {
    padding: 20px 28px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 14px;
  }

  .use-case-num {
    
    font-size: 13px;
    color: var(--teal);
    font-weight: 600;
  }

  .use-case-title {
    
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
  }

  .use-case-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }

  .use-case-scenario {
    padding: 24px 28px;
    border-right: 1px solid var(--border);
    font-size: 14px;
    color: #7a9faf;
    line-height: 1.75;
  }

  .use-case-scenario h5 {
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 10px;
    
  }

  .use-case-code { padding: 0; }

  /* ── SPLASH ── */
  .splash-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px 64px;
    background: linear-gradient(145deg, #1f1232 0%, #30135b 60%, #be52e50f 100%);
    position: relative;
    overflow: hidden;
  }

  .splash-bg-glow {
    position: absolute;
    top: -100px; right: -100px;
    width: 500px; height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, #be52e50f 0%, transparent 65%);
    pointer-events: none;
  }

  .splash-bg-glow2 {
    position: absolute;
    bottom: -150px; left: 100px;
    width: 400px; height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,194,212,0.06) 0%, transparent 65%);
    pointer-events: none;
  }

  .splash-eyebrow {
    
    font-size: 12px;
    color: var(--teal);
    text-transform: uppercase;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .splash-eyebrow::before {
    content: '';
    display: block;
    width: 32px; height: 1px;
    background: var(--teal);
  }

  .splash-title {
    
    font-size: 68px;
    font-weight: 800;
    line-height: 1;
    color: var(--white);
    margin-bottom: 24px;
    max-width: 700px;
  }

  .splash-title em { color: var(--teal); font-style: normal; display: block; }

  .splash-desc {
    font-size: 18px;
    color: var(--muted);
    max-width: 520px;
    line-height: 1.7;
    font-weight: 300;
    margin-bottom: 40px;
  }

  .splash-modules {
    display: flex;
    gap: 14px;
    margin-bottom: 48px;
    flex-wrap: wrap;
  }

  .module-pill {
    background: #23133a;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--ice);
    font-weight: 500;
  }

  .module-pill-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--teal);
  }

  .splash-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--teal);
    color: #f0f8ff;
    
    font-size: 16px;
    font-weight: 800;
    padding: 16px 32px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
  }

  .splash-btn:hover { background: #23133a; transform: translateY(-2px); box-shadow: 0 10px 32px #be52e50f; }

  .splash-arrow { font-size: 22px; }

  .objectives-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 40px;
  }

  .obj-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    background: #23133a;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13.5px;
    color: #c9d1d5;
    line-height: 1.5;
  }

  .obj-check {
    color: var(--teal);
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 1px;
  }

  /* ── SCOPE DIAGRAM ── */
  .scope-diagram {
    background: #0f0818;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 32px;
    margin: 24px 0;
    
    font-size: 14px;
    line-height: 2;
    position: relative;
    overflow: hidden;
  }

  .scope-diagram::before {
    content: 'CEDAR SYNTAX';
    position: absolute;
    top: 12px; right: 16px;
    font-size: 10px;
    color: var(--teal-dim);
  }

  .scope-explain {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
  }

  .scope-item {
    background: #23133a;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
  }

  .scope-item-icon {
    font-size: 26px;
    margin-bottom: 10px;
  }

  .scope-item-label {
    
    font-size: 11px;
    color: var(--teal);
    text-transform: uppercase;
    margin-bottom: 6px;
    font-weight: 600;
  }

  .scope-item-desc {
    font-size: 13px;
    color: #7a9faf;
    line-height: 1.5;
  }

  /* RESPONSIVE */
  @media (max-width: 1100px) {
    .grid-2, .grid-3, .use-case-body, .scope-explain, .objectives-grid { grid-template-columns: 1fr; }
    .page-hero, .content-body { padding-left: 36px; padding-right: 36px; }
    .page-nav { padding-left: 36px; padding-right: 36px; }
    .splash-page { padding: 60px 36px; }
    .splash-title { font-size: 48px; }
    .use-case-scenario { border-right: none; border-bottom: 1px solid var(--border); }
  }

  /* ── MOBILE SIDEBAR (OFF-CANVAS) ── */
  .mobile-topbar {
    display: none;
    position: sticky;
    top: 0;
    z-index: 1;
    height: 56px;
    padding: 0 16px;
    background: #23133a;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    align-items: center;
    gap: 12px;
  }
  .mobile-title {
    min-width: 0;
    font-weight: 800;
    font-size: 0.92rem;
    color: var(--ice);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 34px;
    border-radius: 10px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--ice);
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color 0.2s, background 0.2s, transform 0.2s;
  }
  .menu-btn:hover { border-color: rgba(0,194,212,0.45); background: rgba(0,194,212,0.08); }
  .menu-btn:active { transform: translateY(1px); }
  .menu-btn svg { width: 18px; height: 18px; }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 1;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
  }
  body.sidebar-open .sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  @media (max-width: 1100px) {
    .strongdm-training-guide-3{
        flex-direction: column;
    }

    .mobile-topbar {
      display: flex;
      position: sticky;
      left: 0;
      right: 0;
      top: 0;
    }
    .main { margin-left: 0; }
    .sidebar {
      position: absolute;
      width: min(320px, 86vw);
      transform: translateX(-110%);
      transition: transform 0.22s ease;
      box-shadow: 0 12px 40px rgba(0,0,0,0.45);
    }
    body.sidebar-open .sidebar { transform: translateX(0); }
    body.sidebar-open { overflow: hidden; }
  }

  @media (max-width: 768px) {
    .page-hero { padding: 32px 20px 36px; }
    .hero-title {
      font-size: 30px;
      line-height: 1.1;
      word-break: break-word;
    }
    .hero-desc { font-size: 14px; }
    .hero-meta { flex-direction: column; gap: 10px; }
    .page-nav {
      flex-direction: column;
      gap: 10px;
      align-items: stretch;
      padding: 24px 20px;
    }
    .page-nav .btn { width: 100%; justify-content: center; }
    .page-nav-info { text-align: center; }
  }

  /* ── RESPONSIVE HELPERS ── */
  img, video, canvas, svg { max-width: 100%; height: auto; }
  table { max-width: 100%; }
  @media (max-width: 720px) {
    table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  }
  pre { max-width: 100%; overflow-x: auto; }