.bk {
    --paper: #f4efe6;
    --paper-deep: #ebe4d6;
    --ink: #1a1814;
    --ink-soft: #3d3830;
    --ink-mute: #6b6557;
    --rule: #cfc6b3;
    --rule-soft: #e2dccb;
    --accent: #b8431e;
    --accent-deep: #8a2f12;
    --accent-soft: #f0d4c5;
    --gold: #a07c2c;
    --moss: #4a5d3a;
    --teal: #2e5266;
    --teal-soft: #cfdce4;
    --shadow: 0 1px 0 rgba(0,0,0,0.04), 0 2px 8px rgba(26,24,20,0.06);
  }
.bk * { box-sizing: border-box; margin: 0; padding: 0; }
.bk { scroll-behavior: smooth; scroll-padding-top: 80px; }
.bk {
    background: var(--paper);
    color: var(--ink);
    font-family: 'Fraunces', Georgia, serif;
    font-weight: 400;
    line-height: 1.6;
    font-size: 17px;
    background-image: radial-gradient(circle at 1px 1px, rgba(26,24,20,0.025) 1px, transparent 0);
    background-size: 24px 24px;
    min-height: 100vh;
  }
.bk .masthead {
    border-bottom: 3px double var(--ink);
    padding: 28px 48px 20px;
    background: var(--paper);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
  }
.bk .masthead-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 24px;
    flex-wrap: wrap;
  }
.bk .brand {
    font-family: 'Fraunces', serif;
    font-weight: 900;
    font-size: 28px;
    letter-spacing: -0.02em;
    font-style: italic;
  }
.bk .brand-mark {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
    margin-right: 10px;
    vertical-align: middle;
  }
.bk .masthead-meta {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-mute);
    display: flex;
    gap: 24px;
  }
.bk .masthead-meta span strong { color: var(--ink); font-weight: 700; }
.bk .hero {
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 48px 60px;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 64px;
    align-items: end;
    border-bottom: 1px solid var(--rule);
  }
.bk .hero-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
  }
.bk .hero-eyebrow::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--accent);
    max-width: 80px;
  }
.bk .hero h1 {
    font-family: 'Fraunces', serif;
    font-weight: 300;
    font-size: clamp(48px, 7vw, 88px);
    line-height: 0.95;
    letter-spacing: -0.04em;
    color: var(--ink);
  }
.bk .hero h1 em {
    font-style: italic;
    font-weight: 500;
    color: var(--accent);
  }
.bk .hero-sub {
    font-size: 20px;
    color: var(--ink-soft);
    margin-top: 28px;
    max-width: 650px;
    line-height: 1.5;
  }
.bk .hero-card {
    border: 1px solid var(--ink);
    padding: 24px;
    background: var(--paper-deep);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    line-height: 1.9;
  }
.bk .hero-card-title {
    font-family: 'Fraunces', serif;
    font-style: italic;
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0;
    text-transform: none;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--rule);
    color: var(--ink);
  }
.bk .hero-card-row {
    display: flex;
    justify-content: space-between;
    text-transform: uppercase;
    color: var(--ink-mute);
    gap: 12px;
  }
.bk .hero-card-row strong { color: var(--ink); font-weight: 700; text-align: right; }
.bk .companions {
    background: var(--paper-deep);
    border-top: 1px solid var(--ink);
    border-bottom: 1px solid var(--ink);
    padding: 40px 60px;
  }
.bk .companions-inner { max-width: 1200px; margin: 0 auto; }
.bk .companions-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 8px;
  }
.bk .companions-title {
    font-family: 'Fraunces', Georgia, serif;
    font-size: 36px;
    font-weight: 500;
    line-height: 1.1;
    color: var(--ink);
    margin: 0 0 6px;
    letter-spacing: -0.01em;
  }
.bk .companions-title em { font-style: italic; color: var(--accent); }
.bk .companions-lede {
    font-family: 'Fraunces', Georgia, serif;
    font-style: italic;
    font-size: 16px;
    color: var(--ink-soft);
    margin: 0 0 28px;
    max-width: 660px;
  }
.bk .companions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
  }
.bk .companion-card {
    background: var(--paper);
    border: 1px solid var(--rule);
    padding: 18px 20px 20px;
    position: relative;
    transition: all 0.2s ease;
  }
.bk .companion-card:hover { border-color: var(--ink); transform: translateY(-2px); }
.bk .companion-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--ink-mute);
    letter-spacing: 0.08em;
    margin-bottom: 8px;
  }
.bk .companion-name {
    font-family: 'Fraunces', Georgia, serif;
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 6px;
    line-height: 1.2;
  }
.bk .companion-file {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--accent);
    margin-bottom: 8px;
    word-break: break-word;
  }
.bk .companion-desc {
    font-size: 13px;
    line-height: 1.45;
    color: var(--ink-soft);
    margin: 0;
  }
.bk .companion-tag {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-mute);
    background: var(--paper-deep);
    padding: 2px 6px;
    margin-top: 10px;
  }
.bk .container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 48px;
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 64px;
  }
.bk .sidebar {
    position: sticky;
    top: 110px;
    align-self: start;
    padding-top: 48px;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
  }
.bk .sidebar-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--rule);
  }
.bk .toc-list { list-style: none; }
.bk .toc-list li {
    padding: 6px 0;
    font-size: 13px;
    font-family: 'Inter Tight', sans-serif;
  }
.bk .toc-list a {
    color: var(--ink-soft);
    text-decoration: none;
    display: flex;
    gap: 12px;
    transition: color 0.2s;
    line-height: 1.4;
  }
.bk .toc-list a:hover { color: var(--accent); }
.bk .toc-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--ink-mute);
    padding-top: 3px;
    min-width: 22px;
  }
.bk main { padding: 48px 0 120px; min-width: 0; }
.bk section {
    margin-bottom: 80px;
    scroll-margin-top: 100px;
    animation: fadeUp 0.6s ease-out backwards;
  }
.bk .section-header {
    border-top: 2px solid var(--ink);
    padding-top: 16px;
    margin-bottom: 32px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 24px;
  }
.bk .section-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 700;
  }
.bk .section-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-mute);
  }
.bk h2 {
    font-family: 'Fraunces', serif;
    font-weight: 400;
    font-size: 42px;
    line-height: 1.05;
    letter-spacing: -0.025em;
    margin-bottom: 20px;
  }
.bk h2 em { font-style: italic; color: var(--accent); font-weight: 500; }
.bk h3 {
    font-family: 'Fraunces', serif;
    font-weight: 600;
    font-size: 24px;
    letter-spacing: -0.015em;
    margin: 36px 0 14px;
    line-height: 1.2;
  }
.bk h4 {
    font-family: 'Inter Tight', sans-serif;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin: 24px 0 10px;
    color: var(--ink-soft);
  }
.bk p { margin-bottom: 14px; color: var(--ink-soft); }
.bk p.lede {
    font-size: 20px;
    color: var(--ink);
    font-weight: 300;
    line-height: 1.5;
    margin-bottom: 28px;
    font-style: italic;
  }
.bk code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88em;
  }
.bk .overview-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border: 1px solid var(--ink);
    background: var(--ink);
    margin-bottom: 24px;
  }
.bk .overview-cell {
    background: var(--paper);
    padding: 22px 24px;
  }
.bk .overview-cell-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 6px;
  }
.bk .overview-cell-value {
    font-family: 'Fraunces', serif;
    font-size: 18px;
    color: var(--ink);
    line-height: 1.35;
  }
.bk .overview-cell.span-2 { grid-column: span 2; }
.bk .objectives {
    counter-reset: obj;
    list-style: none;
    padding: 28px 32px;
    background: var(--paper-deep);
    border-left: 3px solid var(--accent);
  }
.bk .objectives li {
    counter-increment: obj;
    padding: 10px 0 10px 48px;
    position: relative;
    color: var(--ink-soft);
    border-bottom: 1px dashed var(--rule);
  }
.bk .objectives li:last-child { border-bottom: none; }
.bk .objectives li::before {
    content: counter(obj, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 0.08em;
  }
.bk .run-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    margin: 8px 0 24px;
  }
.bk .run-table thead th {
    text-align: left;
    padding: 12px 14px;
    background: var(--ink);
    color: var(--paper);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    font-weight: 500;
  }
.bk .run-table tbody td {
    padding: 14px;
    border-bottom: 1px solid var(--rule);
    vertical-align: top;
    font-family: 'Inter Tight', sans-serif;
    color: var(--ink-soft);
  }
.bk .run-table tbody tr:hover { background: var(--paper-deep); }
.bk .run-table .time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--ink);
    white-space: nowrap;
    font-weight: 500;
  }
.bk .run-table .activity-type {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 3px 8px;
    background: var(--accent-soft);
    color: var(--accent-deep);
    border-radius: 2px;
    font-weight: 700;
  }
.bk .activity-type.demo { background: #dcefe9; color: var(--moss); }
.bk .activity-type.practice { background: #d6f0eb; color: var(--gold); }
.bk .activity-type.lecture { background: var(--paper-deep); color: var(--ink); }
.bk .activity-type.frontier { background: var(--teal-soft); color: var(--teal); }
.bk .run-table .topic {
    font-family: 'Fraunces', serif;
    font-size: 15px;
    color: var(--ink);
    font-weight: 500;
  }
.bk .pull-quote {
    font-family: 'Fraunces', serif;
    font-size: 28px;
    font-style: italic;
    font-weight: 300;
    line-height: 1.3;
    color: var(--ink);
    border-left: 3px solid var(--accent);
    padding: 16px 32px;
    margin: 36px 0;
    letter-spacing: -0.01em;
  }
.bk .pull-quote cite {
    display: block;
    margin-top: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-style: normal;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-mute);
  }
.bk .concept-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
  }
.bk .concept-card {
    border: 1px solid var(--ink);
    padding: 22px;
    background: var(--paper);
    position: relative;
  }
.bk .concept-card-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 8px;
  }
.bk .concept-card h4 {
    font-family: 'Fraunces', serif;
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 10px;
    color: var(--ink);
    letter-spacing: -0.01em;
    text-transform: none;
  }
.bk .concept-card p {
    font-size: 14px;
    line-height: 1.55;
    margin: 0;
    color: var(--ink-soft);
  }
.bk .old-new-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    border: 1px solid var(--ink);
  }
.bk .old-new-table thead th {
    padding: 14px 18px;
    background: var(--ink);
    color: var(--paper);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    text-align: left;
  }
.bk .old-new-table tbody td {
    padding: 16px 18px;
    border-bottom: 1px solid var(--rule);
    vertical-align: top;
    font-size: 15px;
    line-height: 1.5;
    color: var(--ink-soft);
  }
.bk .old-new-table tbody tr:last-child td { border-bottom: none; }
.bk .old-new-table .col-old {
    background: var(--paper);
    width: 30%;
    font-family: 'Fraunces', serif;
    font-style: italic;
    color: var(--ink);
  }
.bk .old-new-table .col-new {
    background: var(--paper-deep);
    width: 30%;
    font-family: 'Fraunces', serif;
    font-weight: 600;
    color: var(--accent);
  }
.bk .old-new-table .col-example {
    font-family: 'Inter Tight', sans-serif;
    font-size: 14px;
    color: var(--ink-soft);
    line-height: 1.55;
  }
.bk .flow-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    margin: 24px 0;
    border: 1px solid var(--ink);
  }
.bk .flow-step {
    padding: 22px 16px;
    border-right: 1px solid var(--rule);
    background: var(--paper);
  }
.bk .flow-step:last-child { border-right: none; }
.bk .flow-step .big {
    font-family: 'Fraunces', serif;
    font-size: 44px;
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
    font-style: italic;
  }
.bk .flow-step .word {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin: 10px 0 6px;
    color: var(--ink);
    font-weight: 700;
  }
.bk .flow-step .desc {
    font-size: 12px;
    line-height: 1.4;
    color: var(--ink-soft);
  }
.bk .demo-card {
    border: 1px solid var(--ink);
    padding: 32px;
    margin: 24px 0;
    background: var(--paper);
    position: relative;
  }
.bk .demo-card::before {
    content: 'DEMO';
    position: absolute;
    top: -10px;
    left: 24px;
    background: var(--accent);
    color: var(--paper);
    padding: 2px 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.16em;
    font-weight: 700;
  }
.bk .demo-card h4 { margin-top: 0; color: var(--accent); }
.bk .demo-meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding: 16px 0;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--rule);
  }
.bk .demo-meta div { font-family: 'Inter Tight', sans-serif; font-size: 13px; }
.bk .demo-meta span {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-bottom: 4px;
  }
.bk .template-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--rule);
    background: var(--paper-deep);
    color: var(--accent);
    padding: 8px 10px;
    margin: 0 0 18px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    line-height: 1.35;
    text-decoration: none;
    overflow-wrap: anywhere;
  }
.bk .template-link:hover {
    border-color: var(--accent);
    color: var(--accent-deep);
  }
.bk .demo-steps {
    counter-reset: step;
    list-style: none;
    margin: 16px 0;
  }
.bk .demo-steps li {
    counter-increment: step;
    padding: 10px 0 10px 40px;
    position: relative;
    color: var(--ink-soft);
    line-height: 1.55;
  }
.bk .demo-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 10px;
    width: 26px;
    height: 26px;
    background: var(--ink);
    color: var(--paper);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
  }
.bk .code-block {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    background: var(--ink);
    color: var(--paper);
    padding: 18px 22px;
    border-radius: 2px;
    line-height: 1.6;
    margin: 12px 0;
    overflow-x: auto;
    white-space: pre-wrap;
  }
.bk .code-block .label { color: var(--accent-soft); font-weight: 700; }
.bk .activity-box {
    background: linear-gradient(180deg, var(--paper-deep) 0%, var(--paper) 100%);
    border-left: 4px solid var(--gold);
    padding: 28px 32px;
    margin: 24px 0;
  }
.bk .activity-box .label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--gold);
    font-weight: 700;
    margin-bottom: 8px;
  }
.bk .activity-box h4 {
    margin-top: 0;
    text-transform: none;
    font-family: 'Fraunces', serif;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--ink);
  }
.bk .compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin: 24px 0;
  }
.bk .compare-col {
    border: 1px solid var(--ink);
    padding: 22px;
    background: var(--paper);
  }
.bk .compare-col.bad { border-color: var(--accent-deep); }
.bk .compare-col.bad .compare-label { color: var(--accent-deep); }
.bk .compare-col.good { border-color: var(--moss); }
.bk .compare-col.good .compare-label { color: var(--moss); }
.bk .compare-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 12px;
  }
.bk details {
    border-bottom: 1px solid var(--rule);
    padding: 0;
    margin: 0;
  }
.bk details:first-of-type { border-top: 1px solid var(--rule); }
.bk details summary {
    list-style: none;
    cursor: pointer;
    padding: 18px 0;
    display: flex;
    align-items: baseline;
    gap: 16px;
    font-family: 'Fraunces', serif;
    font-size: 17px;
    font-weight: 500;
    color: var(--ink);
    transition: color 0.2s;
  }
.bk details summary::-webkit-details-marker { display: none; }
.bk details summary::before {
    content: '+';
    font-family: 'JetBrains Mono', monospace;
    font-size: 18px;
    color: var(--accent);
    font-weight: 400;
    line-height: 1;
  }
.bk details[open] summary::before { content: '-'; }
.bk details summary:hover { color: var(--accent); }
.bk details .details-body {
    padding: 0 0 24px 32px;
    color: var(--ink-soft);
  }
.bk .warning-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    border: 1px solid var(--accent-deep);
  }
.bk .warning-row {
    display: grid;
    grid-template-columns: 240px 1fr;
    border-bottom: 1px solid var(--rule-soft);
  }
.bk .warning-row:last-child { border-bottom: none; }
.bk .warning-scenario {
    background: var(--accent-soft);
    padding: 18px 22px;
    font-family: 'Fraunces', serif;
    font-weight: 600;
    color: var(--accent-deep);
    border-right: 1px solid var(--accent-deep);
  }
.bk .warning-fix {
    padding: 18px 22px;
    color: var(--ink-soft);
    font-size: 15px;
    line-height: 1.55;
  }
.bk .faq-category {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 28px 0 8px;
    font-weight: 700;
  }
.bk .glossary dl { border-top: 1px solid var(--rule); }
.bk .glossary dt {
    font-family: 'Fraunces', serif;
    font-weight: 700;
    font-size: 18px;
    color: var(--ink);
    margin-top: 18px;
    font-style: italic;
  }
.bk .glossary dd {
    color: var(--ink-soft);
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--rule);
    line-height: 1.55;
  }
.bk .checklist-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-top: 24px;
  }
.bk .checklist {
    border: 1px solid var(--ink);
    padding: 28px;
    background: var(--paper);
  }
.bk .checklist h4 {
    color: var(--accent);
    margin-top: 0;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 12px;
    margin-bottom: 16px;
  }
.bk .checklist ul { list-style: none; }
.bk .checklist li {
    padding: 8px 0 8px 32px;
    position: relative;
    color: var(--ink-soft);
    cursor: pointer;
    font-size: 15px;
    transition: color 0.2s;
    border-bottom: 1px dotted var(--rule);
  }
.bk .checklist li:last-child { border-bottom: none; }
.bk .checklist li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--ink);
    background: var(--paper);
  }
.bk .checklist li.checked { color: var(--ink-mute); text-decoration: line-through; }
.bk .checklist li.checked::before { background: var(--ink); }
.bk .checklist li.checked::after {
    content: '\2713';
    position: absolute;
    left: 3px;
    top: 7px;
    color: var(--paper);
    font-size: 13px;
    font-weight: 700;
  }
.bk .checklist li:hover { color: var(--accent); }
.bk footer {
    border-top: 3px double var(--ink);
    padding: 48px;
    margin-top: 80px;
    background: var(--paper-deep);
    text-align: center;
  }
.bk footer p {
    font-family: 'Fraunces', serif;
    font-style: italic;
    font-size: 18px;
    color: var(--ink);
    margin-bottom: 8px;
  }
.bk footer .footer-meta {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-mute);
    margin-top: 16px;
  }
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
  }
@media (max-width: 980px) {.bk .container { grid-template-columns: 1fr; gap: 32px; padding: 0 24px; }
.bk .sidebar { display: none; }
.bk .hero { grid-template-columns: 1fr; gap: 32px; padding: 48px 24px; }
.bk .masthead, .bk main { padding-left: 24px; padding-right: 24px; }
.bk .checklist-grid, .bk .compare, .bk .overview-grid, .bk .concept-grid { grid-template-columns: 1fr; }
.bk .flow-grid { grid-template-columns: repeat(2, 1fr); }
.bk .flow-step:nth-child(2) { border-right: none; }
.bk .warning-row { grid-template-columns: 1fr; }
.bk .warning-scenario { border-right: none; border-bottom: 1px solid var(--accent-deep); }
.bk .demo-meta { grid-template-columns: 1fr; }
.bk h2 { font-size: 32px; }}
@media (max-width: 700px) {.bk .companions { padding: 32px 24px; }
.bk .companions-title { font-size: 26px; }
.bk .masthead-meta { gap: 12px; flex-direction: column; }
.bk .flow-grid { grid-template-columns: 1fr; }
.bk .flow-step { border-right: none; border-bottom: 1px solid var(--rule); }
.bk .flow-step:last-child { border-bottom: none; }}