:root{color-scheme:light;--bg:#fafafc;--bg-raised:#fff;--bg-panel:#fff;--bg-header:#fafafccc;--border:#e5e5f0;--border-hover:#cfcfe2;--shadow-panel:0 1px 2px #1717280a, 0 10px 30px #1717280f;--violet:#7c3aed;--violet-soft:#7c3aed1a;--cyan:#22d3ee;--cyan-soft:#22d3ee1a;--cyan-text:#0891b2;--text:#16161f;--text-dim:#55556b;--text-faint:#727286;--success:#059669;--error:#dc2626;--font-mono:"JetBrains Mono", "Space Mono", ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;--font-sans:"Geist", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--radius:10px}:root[data-theme=dark]{color-scheme:dark;--bg:#0a0a0f;--bg-raised:#121218;--bg-panel:#16161e;--bg-header:#0a0a0fcc;--border:#26262f;--border-hover:#38384a;--shadow-panel:none;--violet:#7c3aed;--violet-soft:#7c3aed26;--cyan:#22d3ee;--cyan-soft:#22d3ee26;--cyan-text:#22d3ee;--text:#e8e8f0;--text-dim:#9797a8;--text-faint:#80808f;--success:#34d399;--error:#f87171}@media (prefers-color-scheme:dark){:root:not([data-theme]){color-scheme:dark;--bg:#0a0a0f;--bg-raised:#121218;--bg-panel:#16161e;--bg-header:#0a0a0fcc;--border:#26262f;--border-hover:#38384a;--shadow-panel:none;--violet:#7c3aed;--violet-soft:#7c3aed26;--cyan:#22d3ee;--cyan-soft:#22d3ee26;--cyan-text:#22d3ee;--text:#e8e8f0;--text-dim:#9797a8;--text-faint:#80808f;--success:#34d399;--error:#f87171}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);background-image:radial-gradient(ellipse 60% 40% at 15% 0%, var(--violet-soft), transparent 60%), radial-gradient(ellipse 50% 35% at 100% 10%, var(--cyan-soft), transparent 60%);color:var(--text);font-family:var(--font-sans);background-repeat:no-repeat;flex-direction:column;min-height:100vh;line-height:1.5;transition:background-color .2s,color .2s;display:flex}h1,h2,h3,h4{font-family:var(--font-sans);margin:0;font-weight:600;line-height:1.2}code,pre,.mono{font-family:var(--font-mono)}a{color:var(--cyan-text);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer;font-family:inherit}::selection{background:var(--violet-soft)}.container{width:100%;max-width:1100px;margin:0 auto;padding:0 1.5rem}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.bit-grid{font-family:var(--font-mono);flex-wrap:wrap;gap:4px;display:flex}.bit-cell{border-radius:4px;justify-content:center;align-items:center;width:28px;height:32px;font-size:.85rem;transition:background-color .15s,color .15s,border-color .15s;display:flex}.bit-off{background:var(--bg-raised);color:var(--text-faint);border:1px solid var(--border)}.bit-on{background:var(--violet);color:#fff;border:1px solid var(--violet)}.bit-cell.bit-diff{box-shadow:0 0 0 2px var(--error) inset}.bit-cell.nibble-gap{margin-right:8px}.bit-cell.byte-gap{margin-right:14px}.bit-grid-empty{color:var(--text-faint);margin:0;font-size:.85rem}@media print{.site-header,.site-footer,.cookie-banner,.cp-overlay,.hex-char-tooltip,.hex-char-mark{display:none!important}}.hex-char-tooltip{z-index:1000;background:var(--bg-raised);border:1px solid var(--error);max-width:280px;color:var(--text);font-family:var(--font-sans);pointer-events:none;opacity:0;border-radius:8px;padding:.45rem .7rem;font-size:.8rem;line-height:1.35;transition:opacity .12s,transform .12s;position:fixed;transform:translateY(4px);box-shadow:0 6px 20px #0000004d}.hex-char-tooltip.visible{opacity:1;transform:translateY(0)}.hex-char-tooltip:after{content:"";top:100%;left:var(--arrow-left,50%);border:5px solid #0000;border-top-color:var(--error);position:absolute;transform:translate(-50%)}.hex-char-mark{z-index:999;background:var(--error);pointer-events:none;opacity:0;border-radius:2px;height:3px;transition:opacity .12s;position:fixed}.hex-char-mark.visible{opacity:1}.swatch-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:.75rem;display:grid}.swatch-card{border:1px solid var(--border);color:#fff;text-shadow:0 1px 2px #0009;border-radius:8px;flex-direction:column;justify-content:flex-end;height:90px;padding:.5rem;transition:transform .12s;display:flex}.swatch-card:hover{transform:translateY(-2px)}.swatch-card.copied .swatch-hex:after{content:" ✓"}.swatch-percent{opacity:.9;font-size:.75rem}.swatch-hex{font-size:.75rem;font-weight:600}.swatch-grid .scale-empty{color:var(--text-faint);grid-column:1/-1;font-size:.85rem}