:root {
    --bcg-green: #177B57;
    --bcg-green-deep: #0D4F37;
    --bcg-green-bright: #29BA74;
    --bcg-green-tint: #E8F2EE;
    --bcg-green-tint-2: #F4F9F6;
    --ink: #1A1A1A;
    --ink-soft: #3D3D3D;
    --gray-700: #5C5C5C;
    --gray-500: #8A8A8A;
    --gray-400: #A8A8A8;
    --gray-300: #C7C7C7;
    --gray-200: #DEDEDE;
    --gray-100: #EEEEEE;
    --gray-50: #F7F7F5;
    --paper: #FFFFFF;
    --signal-red: #B33A2F;
    --gold: #B8965A;
    --hair: rgba(26, 26, 26, 0.10);
    --hair-strong: rgba(26, 26, 26, 0.18);
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: 'IBM Plex Sans', sans-serif;
    background: var(--paper);
    color: var(--ink);
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  /* ===== TOP NAV ===== */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--hair);
    padding: 14px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .brand {
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
  }
  .brand-logo {
    height: 30px;
    width: auto;
    color: var(--bcg-green-deep);
    display: block;
  }
  .brand-text { line-height: 1.1; }
  .brand-title {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-700);
  }
  .brand-sub {
    font-family: 'Source Serif 4', serif;
    font-size: 18px;
    font-weight: 500;
    color: var(--ink);
    margin-top: 3px;
    letter-spacing: -0.005em;
  }
  .brand-sub em {
    font-style: italic;
    font-weight: 500;
    color: var(--bcg-green);
    background: linear-gradient(180deg, transparent 70%, var(--bcg-green-tint) 70%);
    padding: 0 2px;
  }
  .topnav {
    display: flex;
    align-items: center;
    gap: 4px;
  }
  .topnav a {
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
    text-decoration: none;
    transition: all 0.2s;
    padding: 8px 16px;
    border-radius: 4px;
    position: relative;
  }
  .topnav a:hover { color: var(--bcg-green); background: var(--bcg-green-tint-2); }
  .topnav a.active { color: var(--bcg-green); background: var(--bcg-green-tint); }
  .topnav a .step-num {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    color: var(--gray-400);
    margin-right: 6px;
  }
  .topnav a.active .step-num { color: var(--bcg-green); }
  .topnav a.cheatsheet-link {
    border: 1.5px solid var(--bcg-green);
    border-radius: 100px;
    padding: 8px 18px;
    margin-left: 12px;
    color: var(--bcg-green);
    font-weight: 600;
  }
  .topnav a.cheatsheet-link:hover {
    background: var(--bcg-green);
    color: var(--paper);
  }
  .topnav a.cheatsheet-link.active {
    background: var(--bcg-green);
    color: var(--paper);
  }

  /* ===== HERO ===== */
  .hero {
    padding: 80px 40px 56px;
    background:
      radial-gradient(ellipse 800px 600px at top right, var(--bcg-green-tint-2) 0%, transparent 70%),
      radial-gradient(ellipse 400px 300px at bottom left, var(--bcg-green-tint-2) 0%, transparent 60%),
      var(--paper);
    border-bottom: 1px solid var(--hair);
  }
  .hero-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 80px;
    align-items: center;
  }
  .hero-eyebrow {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .hero-eyebrow::after {
    content: '';
    flex: 1;
    max-width: 60px;
    height: 1px;
    background: var(--bcg-green);
  }
  .hero-h1 {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(48px, 6vw, 80px);
    line-height: 1.02;
    letter-spacing: -0.025em;
    color: var(--ink);
    margin-bottom: 28px;
  }
  .hero-h1 em {
    font-style: italic;
    color: var(--bcg-green);
    font-weight: 400;
  }
  .hero-lede {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    line-height: 1.45;
    color: var(--ink-soft);
    font-weight: 300;
    max-width: 580px;
    margin-bottom: 40px;
  }
  .hero-lede em { font-style: italic; }
  .hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
  }
  .btn-primary {
    background: var(--bcg-green);
    color: var(--paper);
    border: none;
    padding: 14px 28px;
    border-radius: 4px;
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s;
    text-decoration: none;
  }
  .btn-primary:hover {
    background: var(--bcg-green-deep);
    transform: translateY(-1px);
  }
  .btn-primary::after { content: '→'; font-size: 16px; }
  .btn-secondary {
    background: var(--paper);
    color: var(--ink);
    border: 1.5px solid var(--gray-300);
    padding: 14px 28px;
    border-radius: 4px;
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
  }
  .btn-secondary:hover { border-color: var(--bcg-green); color: var(--bcg-green); }
  .hero-meta {
    display: flex;
    gap: 48px;
    padding-top: 28px;
    border-top: 1px solid var(--hair);
  }
  .meta-block { flex: 0 0 auto; }
  .meta-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--gray-500);
    margin-bottom: 6px;
  }
  .meta-val {
    font-family: 'Source Serif 4', serif;
    font-size: 17px;
    color: var(--ink);
    font-weight: 500;
  }

  /* Hero portrait with real photo */
  .portrait-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 16px;
  }
  .portrait {
    width: 100%;
    max-width: 380px;
    aspect-ratio: 4 / 5;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 24px 48px -16px rgba(13, 79, 55, 0.25);
  }
  .portrait img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }
  .portrait::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(13, 79, 55, 0.85) 100%);
    pointer-events: none;
  }
  .portrait-caption {
    position: absolute;
    bottom: 24px;
    left: 28px;
    z-index: 2;
    color: var(--paper);
  }
  .portrait-caption .name {
    font-family: 'Source Serif 4', serif;
    font-size: 26px;
    font-weight: 500;
    line-height: 1.05;
    margin-bottom: 4px;
  }
  .portrait-caption .name em { font-style: italic; font-weight: 400; }
  .portrait-caption .title {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.85);
  }
  .built-by {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-500);
  }
  .built-by em {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    color: var(--ink);
    text-transform: none;
    font-size: 13px;
    letter-spacing: 0;
  }

  /* ===== SECTIONS ===== */
  section {
    padding: 96px 40px;
    border-bottom: 1px solid var(--hair);
  }
  .section-wrap {
    max-width: 1280px;
    margin: 0 auto;
  }
  .section-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .section-tag::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--bcg-green);
  }
  .section-h {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(36px, 4.5vw, 56px);
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
    max-width: 880px;
  }
  .section-h em { font-style: italic; color: var(--bcg-green); font-weight: 400; }
  .section-lede {
    font-family: 'Source Serif 4', serif;
    font-size: 20px;
    font-weight: 300;
    line-height: 1.5;
    color: var(--ink-soft);
    max-width: 780px;
    margin-bottom: 56px;
  }
  .section-lede em { font-style: italic; }

  /* ===== OBJECTIVE STRIP ===== */
  .objective {
    background: var(--bcg-green-deep);
    color: var(--paper);
    padding: 56px 40px;
  }
  .objective-wrap {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 64px;
    align-items: center;
  }
  .objective-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--bcg-green-bright);
  }
  .objective-text {
    font-family: 'Source Serif 4', serif;
    font-size: clamp(22px, 2.4vw, 30px);
    font-weight: 300;
    line-height: 1.35;
    letter-spacing: -0.01em;
  }
  .objective-text em {
    font-style: italic;
    color: var(--bcg-green-bright);
    font-weight: 400;
  }

  /* ===== LADDER (step-function visual) ===== */
  .ladder-viz {
    position: relative;
    margin: 48px 0;
    padding: 60px 0 40px;
  }
  .ladder-axis {
    position: absolute;
    bottom: 40px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-300);
  }
  .ladder-y-label {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) rotate(-90deg);
    transform-origin: left center;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gray-500);
    white-space: nowrap;
  }
  .ladder-x-label {
    text-align: center;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gray-500);
    margin-top: 16px;
  }
  .ladder-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    align-items: end;
    gap: 0;
    padding-left: 60px;
    margin-bottom: 32px;
  }
  .ladder-step {
    position: relative;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s;
  }
  .ladder-step:hover { transform: translateY(-4px); }
  .ladder-bar {
    width: 100%;
    background: var(--bcg-green-tint);
    border: 2px solid var(--bcg-green);
    border-bottom: none;
    position: relative;
    transition: all 0.3s;
  }
  .ladder-step[data-rung="1"] .ladder-bar {
    height: 140px;
    background: var(--bcg-green-tint-2);
  }
  .ladder-step[data-rung="2"] .ladder-bar {
    height: 220px;
    background: var(--bcg-green-tint);
  }
  .ladder-step[data-rung="3"] .ladder-bar {
    height: 300px;
    background: var(--bcg-green);
    border-color: var(--bcg-green-deep);
  }
  .ladder-step[data-rung="3"] .ladder-bar .ladder-rung-content { color: var(--paper); }
  .ladder-rung-content {
    padding: 24px 20px;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    text-align: center;
  }
  .ladder-rung-num {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--bcg-green);
    margin-bottom: 8px;
  }
  .ladder-step[data-rung="3"] .ladder-rung-num { color: var(--bcg-green-bright); }
  .ladder-rung-verb {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 16px;
    color: var(--ink-soft);
    margin-bottom: 4px;
  }
  .ladder-step[data-rung="3"] .ladder-rung-verb { color: rgba(255,255,255,0.85); }
  .ladder-rung-name {
    font-family: 'Source Serif 4', serif;
    font-size: 26px;
    font-weight: 500;
    line-height: 1.1;
    color: var(--ink);
    letter-spacing: -0.01em;
  }
  .ladder-step[data-rung="3"] .ladder-rung-name { color: var(--paper); }
  .ladder-rung-stat {
    margin-top: 12px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--gray-700);
  }
  .ladder-step[data-rung="3"] .ladder-rung-stat { color: rgba(255,255,255,0.7); }
  .ladder-rung-stat strong {
    font-family: 'Source Serif 4', serif;
    font-size: 15px;
    color: var(--bcg-green);
  }
  .ladder-step[data-rung="3"] .ladder-rung-stat strong { color: var(--bcg-green-bright); }

  .ladder-arrow {
    position: absolute;
    top: 20px;
    left: 60px;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .ladder-arrow-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green);
    font-weight: 600;
  }
  .ladder-arrow-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--bcg-green-tint), var(--bcg-green));
    margin: 0 16px;
    position: relative;
  }
  .ladder-arrow-line::after {
    content: '►';
    position: absolute;
    right: -8px;
    top: -8px;
    color: var(--bcg-green);
    font-size: 14px;
  }

  .ladder-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
  }
  .ladder-card {
    padding: 32px;
    background: var(--paper);
    border: 1px solid var(--hair-strong);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    color: var(--ink);
    display: flex;
    flex-direction: column;
  }
  .ladder-card:hover {
    border-color: var(--bcg-green);
    box-shadow: 0 12px 32px -12px rgba(23, 123, 87, 0.2);
    transform: translateY(-2px);
  }
  .ladder-card-num {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    color: var(--bcg-green);
    margin-bottom: 12px;
  }
  .ladder-card-h {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 12px;
    line-height: 1.2;
  }
  .ladder-card-h em { font-style: italic; }
  .ladder-card-p {
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.55;
    margin-bottom: 16px;
    flex: 1;
  }
  .ladder-card-cta {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 15px;
    color: var(--bcg-green);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: gap 0.2s;
  }
  .ladder-card:hover .ladder-card-cta { gap: 14px; }
  .ladder-card-cta::after { content: '→'; font-style: normal; }

  /* ===== AGENDA (single column) ===== */
  .agenda {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--hair);
    border-radius: 4px;
    overflow: hidden;
  }
  .agenda-row {
    background: var(--paper);
    padding: 24px 32px;
    display: grid;
    grid-template-columns: 90px 1fr auto;
    gap: 32px;
    align-items: center;
    border-bottom: 1px solid var(--hair);
    transition: background 0.2s;
  }
  .agenda-row:last-child { border-bottom: none; }
  .agenda-row:hover { background: var(--bcg-green-tint-2); }
  .agenda-time {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    color: var(--bcg-green);
    font-weight: 500;
  }
  .agenda-body .agenda-title {
    font-family: 'Source Serif 4', serif;
    font-size: 20px;
    font-weight: 500;
    line-height: 1.25;
    margin-bottom: 4px;
  }
  .agenda-body .agenda-sub {
    font-size: 14px;
    color: var(--gray-700);
  }
  .agenda-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 5px 12px;
    border-radius: 100px;
    font-weight: 600;
  }
  .agenda-tag.live { background: var(--bcg-green); color: var(--paper); }
  .agenda-tag.solo { background: var(--gray-100); color: var(--gray-700); }
  .agenda-tag.opt { background: transparent; color: var(--gray-500); border: 1px solid var(--gray-300); }

  /* ===== RULES (instructional design with flip cards) ===== */
  .rules {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .rule-card {
    perspective: 1000px;
    height: 320px;
    cursor: pointer;
  }
  .rule-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
  }
  .rule-card.flipped .rule-card-inner { transform: rotateY(180deg); }
  .rule-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 4px;
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
  }
  .rule-front {
    background: var(--bcg-green-tint-2);
    border: 1px solid var(--bcg-green-tint);
    border-top: 3px solid var(--bcg-green);
  }
  .rule-back {
    background: var(--ink);
    color: var(--paper);
    transform: rotateY(180deg);
    border-top: 3px solid var(--bcg-green-bright);
  }
  .rule-num {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-weight: 300;
    font-size: 40px;
    color: var(--bcg-green);
    line-height: 1;
    margin-bottom: 16px;
  }
  .rule-back .rule-num { color: var(--bcg-green-bright); }
  .rule-h {
    font-family: 'Source Serif 4', serif;
    font-size: 26px;
    font-weight: 500;
    margin-bottom: 14px;
    letter-spacing: -0.01em;
    color: var(--ink);
  }
  .rule-back .rule-h { color: var(--paper); }
  .rule-p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--ink-soft);
    margin-bottom: 16px;
    flex: 1;
  }
  .rule-back .rule-p { color: rgba(255,255,255,0.85); }
  .rule-flip-hint {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .rule-back .rule-flip-hint { color: var(--bcg-green-bright); }
  .rule-flip-hint::after { content: '↻'; font-size: 14px; }

  .rule-back-list {
    list-style: none;
    padding: 0;
    font-size: 14px;
    line-height: 1.7;
  }
  .rule-back-list li {
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
    color: rgba(255,255,255,0.85);
  }
  .rule-back-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--bcg-green-bright);
    font-weight: 700;
  }
  .rule-back-list li.no::before { content: '✗'; color: var(--signal-red); }

  /* ===== LAYER PAGE ===== */
  .page { display: none; }
  .page.active { display: block; animation: fadeIn 0.4s ease both; }
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .layer-hero {
    padding: 64px 40px 48px;
    background: linear-gradient(180deg, var(--bcg-green-tint-2) 0%, var(--paper) 100%);
    border-bottom: 1px solid var(--hair);
  }
  .layer-hero-wrap { max-width: 1280px; margin: 0 auto; }
  .layer-crumb {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-700);
    margin-bottom: 16px;
  }
  .layer-crumb a { color: var(--bcg-green); text-decoration: none; }
  .layer-crumb a:hover { text-decoration: underline; }
  .layer-crumb .sep { color: var(--gray-300); margin: 0 12px; }

  .layer-titlerow {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 48px;
    align-items: end;
    margin-bottom: 24px;
  }
  .layer-h {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(44px, 5.5vw, 72px);
    line-height: 1;
    letter-spacing: -0.03em;
  }
  .layer-h em { font-style: italic; color: var(--bcg-green); font-weight: 400; }
  .layer-rung-vis {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    color: var(--gray-500);
    letter-spacing: 0.15em;
    text-transform: uppercase;
  }
  .layer-rung-vis .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1.5px solid var(--gray-300);
    background: var(--paper);
  }
  .layer-rung-vis .dot.on { background: var(--bcg-green); border-color: var(--bcg-green); }
  .layer-lede {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 300;
    line-height: 1.45;
    color: var(--ink-soft);
    max-width: 820px;
  }
  .layer-lede em { font-style: italic; }

  /* ===== ADVENTURES ===== */
  .adventures-intro {
    padding: 64px 40px 24px;
    max-width: 1280px;
    margin: 0 auto;
  }
  .adventures {
    padding: 0 40px 80px;
  }
  .adventures-wrap {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .adventure {
    background: var(--paper);
    border: 1px solid var(--hair-strong);
    padding: 36px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--ink);
  }
  .adventure:hover {
    border-color: var(--bcg-green);
    transform: translateY(-2px);
    box-shadow: 0 16px 40px -16px rgba(23, 123, 87, 0.18);
  }
  .adventure.default {
    background: var(--bcg-green-tint-2);
    border-color: var(--bcg-green);
  }
  .adventure-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
  }
  .adventure-cat {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green);
  }
  .adventure-default-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    background: var(--bcg-green);
    color: var(--paper);
    padding: 4px 10px;
    border-radius: 100px;
    font-weight: 600;
  }
  .adventure-tag-live { background: var(--bcg-green); color: var(--paper); }
  .adventure-tag-solo { background: var(--gray-100); color: var(--gray-700); }
  .adventure-tag-opt { background: transparent; color: var(--gray-500); border: 1px solid var(--gray-300); }
  .adventure-h {
    font-family: 'Source Serif 4', serif;
    font-size: 26px;
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.015em;
    margin-bottom: 14px;
  }
  .adventure-h em { font-style: italic; }
  .adventure-p {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: 24px;
    flex: 1;
  }
  .adventure-foot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--hair);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gray-500);
  }
  .adventure-go {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 15px;
    color: var(--bcg-green);
    text-transform: none;
    letter-spacing: 0;
  }

  /* ===== WORKFLOW (inside adventure) ===== */
  .workflow {
    display: none;
    padding: 0 40px 80px;
  }
  .workflow.active { display: block; animation: fadeIn 0.4s ease both; }
  .workflow-wrap { max-width: 980px; margin: 0 auto; }
  .workflow-back {
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gray-700);
    padding: 8px 0;
    margin-bottom: 28px;
    transition: color 0.2s;
  }
  .workflow-back:hover { color: var(--bcg-green); }
  .workflow-h {
    font-family: 'Source Serif 4', serif;
    font-weight: 400;
    font-size: 40px;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
  }
  .workflow-h em { font-style: italic; color: var(--bcg-green); }
  .workflow-sub {
    font-family: 'Source Serif 4', serif;
    font-size: 19px;
    color: var(--ink-soft);
    font-weight: 300;
    margin-bottom: 40px;
    line-height: 1.5;
  }
  .workflow-sub em { font-style: italic; }

  /* ===== QUESTION OPENER ===== */
  .question-opener {
    background: var(--bcg-green-tint-2);
    border: 1px solid var(--bcg-green-tint);
    padding: 36px 40px;
    border-radius: 4px;
    margin-bottom: 40px;
  }
  .question-q {
    font-family: 'Source Serif 4', serif;
    font-size: 26px;
    font-weight: 400;
    line-height: 1.3;
    color: var(--ink);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
  }
  .question-q em { font-style: italic; color: var(--bcg-green); }
  .question-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .question-opt {
    background: var(--paper);
    border: 1.5px solid var(--gray-300);
    padding: 20px 24px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    font-family: inherit;
  }
  .question-opt:hover {
    border-color: var(--bcg-green);
    background: var(--bcg-green-tint-2);
  }
  .question-opt.selected {
    border-color: var(--bcg-green);
    background: var(--bcg-green);
    color: var(--paper);
  }
  .question-opt-title {
    font-family: 'Source Serif 4', serif;
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 4px;
    line-height: 1.25;
  }
  .question-opt-sub {
    font-size: 13px;
    color: var(--gray-700);
    line-height: 1.4;
  }
  .question-opt.selected .question-opt-sub { color: rgba(255,255,255,0.8); }

  .scenario {
    background: var(--gray-50);
    padding: 24px 28px;
    margin-bottom: 32px;
    border-left: 3px solid var(--bcg-green);
    border-radius: 0 4px 4px 0;
  }
  .scenario-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-bottom: 8px;
    font-weight: 600;
  }
  .scenario-text {
    font-family: 'Source Serif 4', serif;
    font-size: 16px;
    line-height: 1.55;
    color: var(--ink);
  }
  .scenario-text strong { color: var(--ink); font-weight: 600; }

  /* ===== STEPS ===== */
  .step {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 24px;
    padding: 28px 0;
    border-top: 1px solid var(--hair);
  }
  .step:last-of-type { border-bottom: 1px solid var(--hair); margin-bottom: 32px; }
  .step-num {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-weight: 300;
    font-size: 44px;
    line-height: 0.9;
    color: var(--bcg-green);
    letter-spacing: -0.02em;
  }
  .step-h {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
  }
  .step-flow {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    color: var(--gray-700);
    margin-bottom: 14px;
    letter-spacing: 0.04em;
  }
  .step-flow .arrow { color: var(--bcg-green); margin: 0 8px; }
  .step-desc {
    font-size: 15px;
    color: var(--ink-soft);
    line-height: 1.65;
    margin-bottom: 18px;
  }
  .step-prompt {
    background: var(--ink);
    color: var(--paper);
    padding: 18px 22px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12.5px;
    line-height: 1.65;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
  }
  .step-prompt-text { flex: 1; white-space: pre-wrap; }
  .copy-btn {
    background: transparent;
    color: var(--paper);
    border: 1px solid rgba(255,255,255,0.3);
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    flex-shrink: 0;
    transition: all 0.2s;
  }
  .copy-btn:hover { background: var(--bcg-green); border-color: var(--bcg-green); }
  .copy-btn.copied { background: var(--bcg-green-bright); border-color: var(--bcg-green-bright); }

  .deliv-bar {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 24px 28px;
    background: var(--ink);
    color: var(--paper);
    margin: 8px 0 16px;
    border-radius: 4px;
  }
  .deliv-bar-mark {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 32px;
    color: var(--bcg-green-bright);
    line-height: 1;
  }
  .deliv-bar-body { flex: 1; }
  .deliv-bar-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green-bright);
    margin-bottom: 4px;
  }
  .deliv-bar-name {
    font-family: 'Source Serif 4', serif;
    font-size: 18px;
    font-weight: 400;
    line-height: 1.3;
  }
  .deliv-bar-name em { font-style: italic; }

  .gov-card {
    background: var(--bcg-green-tint-2);
    padding: 24px 28px;
    margin: 28px 0;
    border-radius: 4px;
    border-left: 3px solid var(--bcg-green);
  }
  .gov-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-bottom: 8px;
    font-weight: 600;
  }
  .gov-text {
    font-family: 'Source Serif 4', serif;
    font-size: 16px;
    line-height: 1.55;
    color: var(--ink);
  }
  .gov-text em { font-style: italic; }

  /* ===== OPERATING LAYER: TECHNICAL APPENDIX ===== */
  .tech-appendix {
    background: var(--gray-50);
    border: 1px solid var(--hair);
    border-radius: 4px;
    margin-top: 40px;
    overflow: hidden;
  }
  .tech-appendix-toggle {
    width: 100%;
    background: var(--ink);
    color: var(--paper);
    border: none;
    padding: 20px 28px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: background 0.2s;
  }
  .tech-appendix-toggle:hover { background: var(--bcg-green-deep); }
  .tech-appendix-toggle .arrow-down {
    transition: transform 0.3s;
    color: var(--bcg-green-bright);
  }
  .tech-appendix.open .arrow-down { transform: rotate(180deg); }
  .tech-appendix-body {
    display: none;
    padding: 28px 32px;
    background: var(--gray-50);
  }
  .tech-appendix.open .tech-appendix-body { display: block; }
  .tech-step {
    padding: 16px 0;
    border-top: 1px solid var(--hair);
  }
  .tech-step:first-child { border-top: none; padding-top: 0; }
  .tech-step-h {
    font-family: 'Source Serif 4', serif;
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
  }
  .tech-step-h .step-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    color: var(--bcg-green);
    margin-right: 8px;
    font-weight: 500;
  }
  .tech-step-p {
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.55;
  }
  .tech-step-p code {
    background: var(--ink);
    color: var(--paper);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
  }

  /* ===== HOMEWORK ===== */
  .close {
    background: var(--ink);
    color: var(--paper);
    padding: 96px 40px;
  }
  .close-wrap { max-width: 1280px; margin: 0 auto; }
  .close-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--bcg-green-bright);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .close-tag::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--bcg-green-bright);
  }
  .close-h {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(40px, 5vw, 64px);
    line-height: 1.05;
    letter-spacing: -0.025em;
    margin-bottom: 24px;
    color: var(--paper);
  }
  .close-h em { font-style: italic; color: var(--bcg-green-bright); font-weight: 400; }
  .close-lede {
    font-family: 'Source Serif 4', serif;
    font-size: 21px;
    line-height: 1.5;
    color: rgba(255,255,255,0.75);
    font-weight: 300;
    max-width: 780px;
    margin-bottom: 48px;
  }
  .close-lede em { font-style: italic; color: var(--paper); }

  .hw-progress {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    padding: 16px 24px;
    background: rgba(255,255,255,0.05);
    border-radius: 100px;
    width: fit-content;
  }
  .hw-progress-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.7);
  }
  .hw-progress-count {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    color: var(--bcg-green-bright);
    font-weight: 500;
  }
  .hw-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 56px;
  }
  .hw-card {
    padding: 28px 24px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
  }
  .hw-card:hover {
    background: rgba(255,255,255,0.07);
    border-color: var(--bcg-green-bright);
  }
  .hw-card.done {
    background: rgba(41, 186, 116, 0.1);
    border-color: var(--bcg-green-bright);
  }
  .hw-card.done .hw-h, .hw-card.done .hw-p {
    text-decoration: line-through;
    opacity: 0.6;
  }
  .hw-check {
    width: 22px;
    height: 22px;
    border: 1.5px solid var(--gray-500);
    border-radius: 4px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink);
    font-size: 14px;
    transition: all 0.2s;
  }
  .hw-card.done .hw-check {
    background: var(--bcg-green-bright);
    border-color: var(--bcg-green-bright);
  }
  .hw-card.done .hw-check::after { content: '✓'; font-weight: 700; }
  .hw-cat {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--bcg-green-bright);
    margin-bottom: 8px;
  }
  .hw-h {
    font-family: 'Source Serif 4', serif;
    font-size: 19px;
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
    color: var(--paper);
  }
  .hw-h em { font-style: italic; }
  .hw-p {
    font-size: 13px;
    color: rgba(255,255,255,0.65);
    line-height: 1.55;
  }

  .discussion {
    background: rgba(255,255,255,0.04);
    padding: 36px 40px;
    border-radius: 4px;
    border-left: 3px solid var(--bcg-green-bright);
  }
  .discussion-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green-bright);
    margin-bottom: 16px;
  }
  .discussion-q {
    font-family: 'Source Serif 4', serif;
    font-size: 21px;
    line-height: 1.45;
    margin-bottom: 16px;
    color: var(--paper);
    font-weight: 300;
  }
  .discussion-q em { font-style: italic; }
  .discussion-q:last-child { margin-bottom: 0; }
  .discussion-q::before {
    content: '→  ';
    color: var(--bcg-green-bright);
    font-style: normal;
  }

  /* ===== CHEATSHEET PAGE ===== */
  .cs-hero {
    padding: 64px 40px 48px;
    background: linear-gradient(180deg, var(--bcg-green-tint-2) 0%, var(--paper) 100%);
    border-bottom: 1px solid var(--hair);
  }
  .cs-hero-wrap { max-width: 1280px; margin: 0 auto; }
  .cs-hero h1 {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(44px, 5.5vw, 72px);
    line-height: 1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
  }
  .cs-hero h1 em { font-style: italic; color: var(--bcg-green); font-weight: 400; }
  .cs-hero-lede {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 300;
    line-height: 1.45;
    color: var(--ink-soft);
    max-width: 820px;
  }
  .cs-hero-lede em { font-style: italic; }

  .cs-filters {
    padding: 32px 40px;
    background: var(--paper);
    border-bottom: 1px solid var(--hair);
    position: sticky;
    top: 60px;
    z-index: 50;
  }
  .cs-filters-wrap {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
  }
  .cs-filter-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-500);
    margin-right: 12px;
  }
  .cs-filter {
    background: var(--paper);
    border: 1.5px solid var(--gray-300);
    color: var(--ink);
    padding: 8px 18px;
    border-radius: 100px;
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
  }
  .cs-filter:hover { border-color: var(--bcg-green); color: var(--bcg-green); }
  .cs-filter.active {
    background: var(--bcg-green);
    border-color: var(--bcg-green);
    color: var(--paper);
  }

  .cs-grid {
    padding: 40px;
  }
  .cs-grid-wrap {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .cs-card {
    background: var(--paper);
    border: 1px solid var(--hair-strong);
    border-radius: 4px;
    padding: 24px 28px;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
  }
  .cs-card:hover {
    border-color: var(--bcg-green);
    box-shadow: 0 8px 24px -8px rgba(23, 123, 87, 0.15);
  }
  .cs-card-head {
    margin-bottom: 12px;
  }
  .cs-cat {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--bcg-green);
    font-weight: 500;
  }
  .cs-title {
    font-family: 'Source Serif 4', serif;
    font-size: 20px;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
  }
  .cs-use {
    font-size: 13px;
    color: var(--gray-700);
    margin-bottom: 16px;
    line-height: 1.5;
  }
  .cs-use-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-500);
    margin-right: 4px;
  }
  .cs-prompt {
    background: var(--gray-50);
    border: 1px solid var(--hair);
    padding: 14px 16px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-top: auto;
  }
  .cs-prompt-text {
    flex: 1;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    line-height: 1.6;
    color: var(--ink-soft);
  }
  .cs-copy {
    background: var(--ink);
    color: var(--paper);
    border: 1px solid var(--ink);
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    flex-shrink: 0;
    transition: all 0.2s;
  }
  .cs-copy:hover { background: var(--bcg-green); border-color: var(--bcg-green); }
  .cs-copy.copied { background: var(--bcg-green-bright); border-color: var(--bcg-green-bright); }

  /* ===== FOOTER ===== */
  footer {
    padding: 48px 40px;
    text-align: center;
    border-top: 1px solid var(--hair);
    background: var(--paper);
  }
  .foot-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-500);
  }

  /* ===== RESPONSIVE ===== */
  @media (max-width: 1100px) {
    .hero-grid, .layer-titlerow { grid-template-columns: 1fr; }
    .portrait-wrap { align-items: flex-start; }
    .rules, .ladder-cards, .hw-grid, .adventures-wrap, .cs-grid-wrap { grid-template-columns: 1fr 1fr; }
    .ladder-steps { grid-template-columns: repeat(3, 1fr); }
  }
  @media (max-width: 720px) {
    .topbar, section, .layer-hero, .adventures-intro, .adventures, .workflow, .close, .cs-hero, .cs-filters, .cs-grid { padding-left: 20px; padding-right: 20px; }
    .rules, .ladder-cards, .hw-grid, .adventures-wrap, .cs-grid-wrap, .question-options { grid-template-columns: 1fr; }
    .topnav { display: none; }
    .ladder-steps { grid-template-columns: repeat(3, 1fr); padding-left: 0; }
    .ladder-y-label, .ladder-arrow { display: none; }
  }


  /* ===== BEST-PRACTICES PREAMBLE (cheatsheet-style) ===== */
  .preamble {
    padding: 64px 40px 32px;
    border-bottom: 1px solid var(--hair);
    background: var(--gray-50);
  }
  .preamble-wrap { max-width: 1280px; margin: 0 auto; }
  .preamble-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .preamble-tag::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--bcg-green);
  }
  .preamble-h {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(32px, 4vw, 48px);
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
  }
  .preamble-h em { font-style: italic; color: var(--bcg-green); font-weight: 400; }
  .preamble-lede {
    font-family: 'Source Serif 4', serif;
    font-size: 18px;
    font-weight: 300;
    line-height: 1.5;
    color: var(--ink-soft);
    max-width: 760px;
    margin-bottom: 40px;
    font-style: italic;
  }

  .preamble-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
  }

  /* Anatomy card (4-part prompt) */
  .anatomy-card {
    background: var(--paper);
    border: 1px solid var(--hair);
    border-radius: 4px;
    padding: 28px;
  }
  .anatomy-h {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--bcg-green);
    margin-bottom: 8px;
  }
  .anatomy-h2 {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 6px;
    letter-spacing: -0.01em;
  }
  .anatomy-h2 em { font-style: italic; color: var(--bcg-green); }
  .anatomy-sub {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 14px;
    color: var(--gray-700);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--hair);
  }
  .anatomy-parts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .anatomy-part {
    background: var(--bcg-green-tint-2);
    border-left: 3px solid var(--bcg-green);
    border-radius: 0 4px 4px 0;
    padding: 14px 16px;
  }
  .anatomy-part-num {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    color: var(--bcg-green);
    letter-spacing: 0.15em;
    margin-bottom: 4px;
    font-weight: 500;
  }
  .anatomy-part-h {
    font-family: 'Source Serif 4', serif;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
  }
  .anatomy-part-p {
    font-size: 13px;
    color: var(--ink-soft);
    line-height: 1.5;
    margin-bottom: 10px;
  }
  .anatomy-example {
    background: rgba(184, 150, 90, 0.08);
    border-left: 2px solid var(--gold);
    padding: 8px 10px;
    border-radius: 0 4px 4px 0;
  }
  .anatomy-example-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    color: var(--gold);
    letter-spacing: 0.15em;
    font-weight: 600;
    margin-right: 4px;
  }
  .anatomy-example-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    color: var(--ink-soft);
    line-height: 1.5;
  }

  /* Tool picker card (right side) */
  .tools-card {
    background: var(--paper);
    border: 1px solid var(--hair);
    border-radius: 4px;
    padding: 28px;
  }
  .tools-table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 16px;
  }
  .tools-table thead th {
    background: var(--ink);
    color: var(--paper);
    text-align: left;
    padding: 10px 14px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 600;
  }
  .tools-table tbody td {
    padding: 14px 14px;
    border-bottom: 1px solid var(--hair);
    font-size: 13px;
    line-height: 1.5;
  }
  .tools-table tbody tr:last-child td { border-bottom: none; }
  .tools-table tbody td:first-child {
    font-family: 'Source Serif 4', serif;
    font-size: 16px;
    font-weight: 500;
    color: var(--bcg-green);
    width: 30%;
  }
  .tools-rule {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--hair);
    font-size: 13px;
    color: var(--gray-700);
    line-height: 1.55;
  }
  .tools-rule strong { color: var(--ink); }

  /* Kill My Page callout */
  .kill-my-page {
    background: var(--ink);
    color: var(--paper);
    padding: 32px 36px;
    border-radius: 4px;
    margin-top: 32px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 28px;
    align-items: center;
  }
  .kill-mark {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-weight: 300;
    font-size: 56px;
    color: var(--bcg-green-bright);
    line-height: 0.9;
  }
  .kill-body {}
  .kill-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--bcg-green-bright);
    margin-bottom: 6px;
  }
  .kill-h {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 6px;
  }
  .kill-h em { font-style: italic; color: var(--bcg-green-bright); }
  .kill-p {
    font-size: 14px;
    line-height: 1.55;
    color: rgba(255,255,255,0.75);
    max-width: 540px;
  }
  .kill-prompt-btn {
    background: var(--bcg-green-bright);
    color: var(--ink);
    border: none;
    padding: 12px 22px;
    border-radius: 4px;
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
  }
  .kill-prompt-btn:hover { background: var(--paper); }
  .kill-prompt-btn.copied { background: var(--paper); }

  /* ===== VARIED RULE FORMATS ===== */
  /* Update the rules grid to allow wider single cards */
  .rules-mixed {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
  }
  .rules-mixed .rule-card { height: 320px; }

  /* Rule card variant: annotated example (no flip) */
  .rule-annotated {
    background: var(--paper);
    border: 1px solid var(--hair-strong);
    border-top: 3px solid var(--bcg-green);
    border-radius: 4px;
    padding: 28px 24px;
    height: 320px;
    display: flex;
    flex-direction: column;
  }
  .rule-annotated .rule-num {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-weight: 300;
    font-size: 36px;
    color: var(--bcg-green);
    line-height: 1;
    margin-bottom: 12px;
  }
  .rule-annotated .rule-h {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 10px;
  }
  .rule-annotated .rule-p {
    font-size: 14px;
    line-height: 1.55;
    color: var(--ink-soft);
    margin-bottom: 14px;
  }
  .rule-bad-good {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .rule-bad, .rule-good {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    line-height: 1.5;
    padding: 8px 10px;
    border-radius: 4px;
  }
  .rule-bad {
    background: rgba(179, 58, 47, 0.06);
    border-left: 2px solid var(--signal-red);
    color: var(--ink-soft);
  }
  .rule-good {
    background: var(--bcg-green-tint-2);
    border-left: 2px solid var(--bcg-green);
    color: var(--ink);
  }
  .rule-bad strong, .rule-good strong {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.15em;
    margin-right: 6px;
  }
  .rule-bad strong { color: var(--signal-red); }
  .rule-good strong { color: var(--bcg-green); }

  /* Rule card variant: 10/20/70 split bar */
  .rule-split {
    background: var(--bcg-green-deep);
    color: var(--paper);
    border-radius: 4px;
    padding: 28px 24px;
    height: 320px;
    display: flex;
    flex-direction: column;
  }
  .rule-split .rule-num {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-weight: 300;
    font-size: 36px;
    color: var(--bcg-green-bright);
    line-height: 1;
    margin-bottom: 12px;
  }
  .rule-split .rule-h {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 10px;
    color: var(--paper);
  }
  .rule-split .rule-p {
    font-size: 13px;
    line-height: 1.55;
    color: rgba(255,255,255,0.8);
    margin-bottom: 18px;
  }
  .split-bar {
    display: flex;
    height: 28px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
  }
  .split-seg {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    font-weight: 600;
    color: var(--paper);
  }
  .split-10 { flex: 1; background: rgba(255,255,255,0.15); }
  .split-20 { flex: 2; background: rgba(41, 186, 116, 0.4); }
  .split-70 { flex: 7; background: var(--bcg-green-bright); color: var(--ink); }
  .split-labels {
    display: flex;
    font-size: 11px;
    color: rgba(255,255,255,0.75);
  }
  .split-label-10 { flex: 1; text-align: center; }
  .split-label-20 { flex: 2; text-align: center; }
  .split-label-70 { flex: 7; text-align: center; }

  /* ===== OUTPUT PREVIEW BLOCKS ===== */
  .output-preview {
    margin: 32px 0;
    border: 1px solid var(--hair-strong);
    border-radius: 4px;
    overflow: hidden;
  }
  .output-preview-header {
    background: var(--gray-50);
    padding: 14px 22px;
    border-bottom: 1px solid var(--hair);
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .output-preview-dots {
    display: flex;
    gap: 6px;
  }
  .output-preview-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--gray-300);
  }
  .output-preview-dots span:first-child { background: #ED6E5E; }
  .output-preview-dots span:nth-child(2) { background: #F4BE4F; }
  .output-preview-dots span:nth-child(3) { background: #61C554; }
  .output-preview-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gray-700);
    margin-left: 8px;
  }
  .output-preview-body {
    padding: 28px 32px;
    background: var(--paper);
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 14px;
    line-height: 1.65;
    color: var(--ink);
  }

  /* Email-style preview */
  .email-header {
    border-bottom: 1px solid var(--hair);
    padding-bottom: 14px;
    margin-bottom: 18px;
  }
  .email-row {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 12px;
    padding: 3px 0;
    font-size: 13px;
  }
  .email-row .lbl {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gray-500);
    padding-top: 3px;
  }
  .email-row .val { color: var(--ink); }
  .email-row .val strong { font-weight: 600; }
  .email-subject {
    font-family: 'Source Serif 4', serif;
    font-size: 19px;
    font-weight: 500;
    margin: 14px 0 6px;
    color: var(--ink);
  }
  .email-body p {
    margin-bottom: 12px;
    line-height: 1.65;
  }
  .email-body ul {
    margin: 0 0 14px 22px;
    padding: 0;
  }
  .email-body li { margin-bottom: 6px; }
  .email-body .flag {
    background: rgba(184, 150, 90, 0.1);
    border-left: 3px solid var(--gold);
    padding: 10px 14px;
    border-radius: 0 4px 4px 0;
    margin: 12px 0;
    font-size: 13px;
  }
  .email-body .flag strong {
    color: var(--gold);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-right: 6px;
  }
  .email-sig {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--hair);
    color: var(--gray-700);
    font-style: italic;
    font-size: 13px;
  }

  /* IC One Pager preview */
  .icmemo-h {
    font-family: 'Source Serif 4', serif;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 4px;
  }
  .icmemo-meta {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    color: var(--gray-500);
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--hair);
  }
  .icmemo-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 16px;
    padding: 10px 0;
    border-bottom: 1px solid var(--hair);
    font-size: 13px;
  }
  .icmemo-row:last-child { border-bottom: none; }
  .icmemo-row .icmemo-lbl {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--bcg-green);
    padding-top: 2px;
    font-weight: 600;
  }
  .icmemo-row .icmemo-val {
    color: var(--ink);
    line-height: 1.6;
  }
  .icmemo-val ul { margin: 4px 0 0 18px; padding: 0; }
  .icmemo-val li { margin-bottom: 4px; }

  /* SKILL.md preview (code-style) */
  .skill-preview-body {
    padding: 0;
    background: #1a1a1a;
    color: #e8e8e8;
  }
  .skill-tab-bar {
    background: #0d0d0d;
    padding: 0 16px;
    border-bottom: 1px solid #2a2a2a;
    display: flex;
    gap: 0;
  }
  .skill-tab {
    padding: 10px 16px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    color: rgba(255,255,255,0.5);
    border-bottom: 2px solid transparent;
  }
  .skill-tab.active {
    color: var(--bcg-green-bright);
    border-bottom-color: var(--bcg-green-bright);
  }
  .skill-content {
    padding: 24px 28px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12.5px;
    line-height: 1.7;
    white-space: pre-wrap;
    color: #e8e8e8;
  }
  .skill-content .md-h1 { color: #61C554; font-weight: 600; }
  .skill-content .md-h2 { color: #F4BE4F; font-weight: 600; }
  .skill-content .md-h3 { color: var(--bcg-green-bright); font-weight: 600; }
  .skill-content .md-fence { color: #9d8aea; }
  .skill-content .md-frontmatter { color: rgba(255,255,255,0.5); font-style: italic; }
  .skill-content .md-code { color: #f4be4f; }
  .skill-content .md-strong { color: var(--paper); font-weight: 600; }

  /* Output preview reveal toggle */
  .output-toggle {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--ink);
    padding: 10px 18px;
    border-radius: 4px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 16px 0;
  }
  .output-toggle:hover {
    border-color: var(--bcg-green);
    color: var(--bcg-green);
  }
  .output-toggle .chev {
    transition: transform 0.3s;
    font-size: 10px;
  }
  .output-toggle.open .chev { transform: rotate(180deg); }
  .output-collapsed { display: none; }
  .output-collapsed.show { display: block; animation: fadeIn 0.3s ease both; }

  /* ===== TEAMMATE INGREDIENTS (4-part) - same as anatomy but different colors ===== */
  .ingredients-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
  }
  .ingredients-card {
    background: var(--paper);
    border: 1px solid var(--hair);
    border-radius: 4px;
    padding: 28px;
  }
  .ingredient {
    background: var(--bcg-green-tint-2);
    border-left: 3px solid var(--bcg-green);
    border-radius: 0 4px 4px 0;
    padding: 14px 16px;
  }

  @media (max-width: 1100px) {
    .preamble-grid, .ingredients-grid { grid-template-columns: 1fr; }
    .anatomy-parts { grid-template-columns: 1fr 1fr; }
    .rules-mixed { grid-template-columns: 1fr 1fr; }
    .kill-my-page { grid-template-columns: 1fr; text-align: center; }
    .kill-mark { margin: 0 auto; }
  }
  @media (max-width: 720px) {
    .anatomy-parts { grid-template-columns: 1fr; }
    .rules-mixed { grid-template-columns: 1fr; }
  }