.bk{--bk-gap:clamp(3.5rem,7vw,6rem);padding-bottom:6rem}.bk-wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(1.25rem,4vw,3rem)}.bk-hero{padding:clamp(3.5rem,8vw,6.5rem) 0 clamp(2.5rem,5vw,4rem);background:var(--hero-bg);border-bottom:1px solid var(--line)}.bk-eyebrow{font-family:var(--mono);font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent-copy);margin:0 0 1rem}.bk-hero h1{font-size:clamp(2.5rem,6vw,4.25rem);font-weight:850;letter-spacing:-.01em;margin:0 0 1rem;color:var(--hero-ink)}.bk-lead{font-size:clamp(1.05rem,2vw,1.3rem);color:var(--hero-body);max-width:44ch;margin:0 0 2rem}.bk-hero-actions{display:flex;flex-wrap:wrap;gap:.75rem}.bk-section{padding-top:var(--bk-gap)}.bk-section>.bk-wrap>header{margin-bottom:2rem;max-width:60ch}.bk-kicker{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0 0 .6rem}.bk-section h2{font-size:clamp(1.6rem,3.4vw,2.2rem);font-weight:800;margin:0 0 .5rem;color:var(--ink)}.bk-section h2+p{color:var(--body);margin:0}.bk-grid{display:grid;gap:1rem}.bk-grid.cols-2{grid-template-columns:repeat(2,1fr)}.bk-grid.cols-3{grid-template-columns:repeat(3,1fr)}.bk-grid.cols-4{grid-template-columns:repeat(4,1fr)}@media (max-width:860px){.bk-grid.cols-3,.bk-grid.cols-4{grid-template-columns:repeat(2,1fr)}}@media (max-width:560px){.bk-grid.cols-2,.bk-grid.cols-3,.bk-grid.cols-4{grid-template-columns:1fr}}.bk-card{background:var(--surface);border:1px solid var(--line);padding:1.25rem}.bk-btn,.bk-card{border-radius:var(--radius)}.bk-btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--sans);font-size:.9rem;font-weight:650;padding:.62rem 1rem;border:1px solid var(--line);cursor:pointer;background:transparent;color:var(--ink);text-decoration:none;transition:transform .08s ease,border-color .15s ease,background .15s ease}.bk-btn:hover{text-decoration:none;border-color:var(--accent-copy);transform:translateY(-1px)}.bk-btn.primary{background:var(--amber);color:#06120a;border-color:transparent}.bk-btn.primary:hover{background:var(--amber-600)}.bk-btn svg{width:15px;height:15px}.bk-logo-tile{border:1px solid var(--line);border-radius:var(--radius);min-height:190px;display:grid;place-items:center;padding:2rem;position:relative;overflow:hidden}.bk-logo-tile.on-dark{background:#05070d}.bk-logo-tile.on-light{background:#f7fbff}.bk-logo-tile.on-navy{background:linear-gradient(135deg,#080d18,#101727)}.bk-logo-tile img{max-width:68%;height:auto}.bk-logo-tile .bk-tag{position:absolute;top:.75rem;left:.9rem;font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.5)}.bk-logo-tile.on-light .bk-tag{color:rgba(7,17,31,.45)}.bk-logo-foot{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-top:.75rem;flex-wrap:wrap}.bk-logo-foot .name{font-weight:650;color:var(--ink);font-size:.92rem}.bk-logo-foot .desc{color:var(--muted);font-size:.82rem}.bk-dl-row{display:flex;gap:.4rem}.bk-clearspace{background:#05070d;border:1px solid var(--line);border-radius:var(--radius);padding:3rem;display:grid;place-items:center;position:relative}.bk-clearspace .frame{position:relative;padding:2.4rem;border:1px dashed rgba(183,255,74,.5);border-radius:6px}.bk-clearspace .frame:before{content:"";position:absolute;inset:.9rem;border:1px dashed rgba(183,255,74,.28);border-radius:4px}.bk-clearspace img{width:160px;height:auto;display:block;position:relative}.bk-rule{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.bk-rule .stage{min-height:130px;display:grid;place-items:center;padding:1.5rem;background:#05070d}.bk-rule .stage img{width:116px;height:auto}.bk-rule .label{display:flex;align-items:center;gap:.5rem;padding:.75rem 1rem;font-size:.88rem;font-weight:600}.bk-rule.do .label{color:var(--mint)}.bk-rule.dont .label{color:#ff8f8f}.bk-rule .badge{width:18px;height:18px;flex:none}.bk-abuse-stretch{transform:scaleX(1.6)}.bk-abuse-rotate{transform:rotate(12deg)}.bk-abuse-recolor{filter:hue-rotate(180deg) saturate(1.8)}.bk-abuse-shadow{filter:drop-shadow(0 6px 10px rgba(0,0,0,.9))}.bk-name-row{display:flex;align-items:center;gap:.75rem;padding:.85rem 1.1rem;border:1px solid var(--line);border-radius:var(--radius)}.bk-name-row.ok{border-color:rgba(97,255,209,.35)}.bk-name-row.no{border-color:rgba(255,143,143,.32)}.bk-name-row .word{font-size:1.15rem;font-weight:750}.bk-name-row.no .word{color:var(--muted);text-decoration:line-through;text-decoration-color:rgba(255,143,143,.6)}.bk-name-row .why{margin-left:auto;font-size:.8rem;color:var(--muted)}.bk-swatch{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;cursor:pointer;text-align:left;background:transparent;color:inherit;font-family:var(--sans);transition:transform .08s ease,border-color .15s ease}.bk-swatch:hover{transform:translateY(-2px);border-color:var(--accent-copy)}.bk-swatch .chip{height:96px}.bk-swatch .meta{padding:.75rem .85rem .9rem}.bk-swatch .cname{font-weight:650;color:var(--ink);font-size:.92rem;display:flex;align-items:center;justify-content:space-between}.bk-swatch .crole{color:var(--muted);font-size:.78rem;margin:.2rem 0 .55rem;min-height:2.1em}.bk-hex{display:flex;align-items:center;gap:.4rem;font-family:var(--mono);font-size:.78rem;color:var(--body)}.bk-hex .k{color:var(--muted)}.bk-copied{color:var(--mint);font-family:var(--mono);font-size:.72rem}.bk-type-card{border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;background:var(--surface)}.bk-type-name{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:1rem}.bk-type-name .fam{font-size:1.35rem;font-weight:750;color:var(--ink)}.bk-type-name .use{font-family:var(--mono);font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.bk-type-spec .sans{font-family:var(--sans)}.bk-type-spec .mono{font-family:var(--mono)}.bk-type-line{display:flex;align-items:baseline;gap:1rem;padding:.5rem 0;border-top:1px solid var(--section-soft-line)}.bk-type-line .w{font-family:var(--mono);font-size:.72rem;color:var(--muted);width:8ch;flex:none}.bk-type-line .sample{color:var(--ink)}.bk-token-tbl{width:100%;border-collapse:collapse}.bk-token-tbl td,.bk-token-tbl th{text-align:left;padding:.65rem .75rem;border-bottom:1px solid var(--section-soft-line);font-size:.88rem}.bk-token-tbl th{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600}.bk-token-tbl td.tok{font-family:var(--mono);color:var(--accent-copy)}.bk-token-tbl td .bar{height:12px;background:var(--amber);border-radius:3px;display:inline-block;vertical-align:middle}.bk-radius-demo{display:flex;gap:1rem;flex-wrap:wrap}.bk-radius-demo .r{width:84px;height:84px;background:var(--surface);border:1px solid var(--line);display:grid;place-items:end center;padding-bottom:6px;font-family:var(--mono);font-size:.7rem;color:var(--muted)}.bk-note{color:var(--muted);font-size:.86rem}.bk-note code{font-family:var(--mono);color:var(--accent-copy);background:rgba(183,255,74,.08);padding:.05em .35em;border-radius:4px}