/* ==========================================================================
   Write-up figures (js/figures/*) and pre-rendered fallbacks.
   Series colours are fixed and never cycled: blue, orange, aqua. Text always uses ink colours.
   ========================================================================== */
.fig {
  --fig-surface: #1a1a19;
  --fig-blue: #3987e5; --fig-orange: #d95926; --fig-aqua: #199e70;
  --ink-1: #f0efec; --ink-2: #c3c2b7; --ink-3: #898781;
  --fig-grid: #2c2c2a;
  position: relative; margin: var(--space-8) 0; border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
  background: var(--fig-surface); color: var(--ink-1);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.38);
  transform: perspective(1100px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transition: transform 280ms ease-out, border-color var(--t-base) var(--ease);
}
.fig:hover { border-color: var(--line-strong); }
.fig p { max-width: none; }

.fig-bar { display: flex; align-items: center; gap: 6px; padding: 0.55rem 1rem; border-bottom: 1px solid var(--line); font: 0.72rem var(--font-mono); color: var(--ink-3); }
.fig-dots { display: inline-flex; gap: 6px; }
.fig-dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); }
.fig-dots i:first-child { background: var(--green); opacity: 0.8; }
.fig-id { margin-left: auto; letter-spacing: 0.08em; }
.fig-title { margin: 0; padding: 1rem 1.25rem 0.25rem; font-size: 1.1rem; font-weight: 650; letter-spacing: -0.01em; line-height: 1.3; }

.fig-stage { position: relative; margin: 0.5rem 1.25rem; aspect-ratio: var(--ar, 16 / 9); }
.fig-stage.is-flow { aspect-ratio: auto; }
.fig-stage > img { width: 100%; height: 100%; object-fit: contain; display: block; border-radius: 8px; }
.fig-alt { margin: 0; padding: var(--space-6); border: 1px dashed var(--line-strong); border-radius: 10px; color: var(--ink-2); font-size: 0.92rem; }
.fig-svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; overflow: visible; }
@media (max-width: 640px) { .fig-stage { aspect-ratio: var(--arn, var(--ar, 16 / 9)); margin-inline: 0.75rem; } .fig-controls { margin-inline: 0.75rem !important; } }

.fig-controls { margin: 0.5rem 1.25rem; min-height: var(--ctl, 0px); }
@media (max-width: 640px) { .fig-controls { min-height: var(--ctln, var(--ctl, 0px)); } }
.fig-cap { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: var(--space-3) var(--space-6); margin: 0.5rem 0 0; padding: 0.8rem 1.25rem 1rem; border-top: 1px dashed var(--line); font: 0.78rem/1.55 var(--font-mono); color: var(--ink-2); }
.fig-caption { max-width: 62ch; }
.fig-actions { display: inline-flex; gap: var(--space-2); }
.fig-data { padding: 0 1.25rem 1.25rem; }
.fig-data[hidden] { display: none; }
.fig-error { padding: var(--space-4) var(--space-6); border: 1px solid var(--fig-orange); border-radius: 10px; background: rgba(217, 89, 38, 0.08); color: var(--ink-1); }
.fig-error p { margin: 0.25rem 0 0; color: var(--ink-2); font-size: 0.9rem; }
.fig-stage.is-error { display: grid; gap: var(--space-4); aspect-ratio: auto; }

/* controls */
.fig-btn { min-height: 36px; padding: 0 var(--space-4); border: 1px solid var(--line-strong); border-radius: 8px; background: transparent; color: var(--ink-1); font: 0.78rem var(--font-mono); cursor: pointer; transition: border-color var(--t-fast), color var(--t-fast); }
.fig-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.fig-btn[aria-expanded="true"] { border-color: var(--green); color: var(--green); }
.fig-sliders { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3) var(--space-8); margin: var(--space-2) 0; }
.fig-slider { display: grid; grid-template-columns: auto minmax(7rem, 1fr) minmax(4.5rem, auto); align-items: center; gap: var(--space-3); flex: 1 1 16rem; font: 0.78rem var(--font-mono); color: var(--ink-2); }
.fig-slider output { color: var(--ink-1); text-align: right; font-variant-numeric: tabular-nums; }
.fig-slider input { accent-color: var(--fig-blue); width: 100%; min-height: 28px; }
.fig-readout { margin: var(--space-2) 0; min-height: 3.2em; font: 0.8rem/1.6 var(--font-mono); color: var(--ink-2); }
.fig-readout.is-bad { color: var(--ink-1); }
.fig-readout.is-bad::before { content: "✗ "; color: var(--fig-orange); font-weight: 700; }
.fig-status:not(.is-bad)::before { content: "✓ "; color: var(--fig-aqua); font-weight: 700; }
.fig-eq, .fig-note-line, .fig-total { margin: var(--space-2) 0; font: 0.8rem/1.6 var(--font-mono); color: var(--ink-2); }
.fig-legend { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); margin: 0 0 var(--space-2); font: 0.76rem var(--font-mono); color: var(--ink-2); }
.fig-legend li { display: inline-flex; align-items: center; gap: 0.5em; }
.fig-sw { display: inline-block; width: 14px; height: 4px; border-radius: 2px; background: var(--ink-1); }
.sw-blue { background: var(--fig-blue); } .sw-orange { background: var(--fig-orange); } .sw-aqua { background: var(--fig-aqua); } .sw-ink { background: var(--ink-1); }

/* data table */
.fig-table { overflow: auto; max-height: 22rem; margin-top: var(--space-3); border: 1px solid var(--line); border-radius: 10px; }
.fig-table table { width: 100%; border-collapse: collapse; font: 0.78rem var(--font-mono); }
.fig-table th, .fig-table td { padding: 0.45rem 0.8rem; text-align: left; border-bottom: 1px solid var(--fig-grid); color: var(--ink-2); white-space: nowrap; }
.fig-table thead th { position: sticky; top: 0; background: #222221; color: var(--ink-1); }
.fig-table tbody th { color: var(--ink-1); font-weight: 500; }

/* The Markdown typography (.ctf-md) must not leak into figures */
.ctf-md .fig ol, .ctf-md .fig ul { margin: 0; padding: 0; list-style: none; }
.ctf-md .fig li { margin: 0; padding: 0; max-width: none; }
.ctf-md .fig p { margin: 0; color: var(--ink-2); max-width: none; }
.ctf-md .fig .fig-title { margin: 0; padding: 1rem 1.25rem 0.25rem; color: var(--ink-1); }
.ctf-md .fig .fig-readout, .ctf-md .fig .fig-eq, .ctf-md .fig .fig-note-line, .ctf-md .fig .fig-total { margin: var(--space-2) 0; }
.ctf-md .fig strong { color: inherit; }
.ctf-md .fig .flow-rhead strong, .ctf-md .fig .flow-node strong { color: var(--ink-1); }

/* ---------- SVG marks ---------- */
.fig-svg text { font-family: var(--font-mono); }
.fg-grid { stroke: var(--fig-grid); stroke-width: 1; }
.fg-tick { fill: var(--ink-3); font-size: 11px; }
.fg-axis { fill: var(--ink-2); font-size: 12px; }
.fg-note { fill: var(--ink-2); font-size: 11.5px; font-family: var(--font-sans) !important; }
.fg-label, .fg-lbl { fill: var(--ink-1); font-size: 12px; }
.fg-lbl.is-sel { font-weight: 700; }
.fg-band { fill: rgba(255, 255, 255, 0.045); }
.fg-line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.fg-pt { stroke: var(--fig-surface); stroke-width: 1.5; }
.fg-ref { stroke: var(--ink-3); stroke-width: 1; }
.fg-cursor { stroke: var(--ink-1); stroke-width: 1; stroke-dasharray: 3 3; }
.fg-margin { stroke-width: 2; }
.fg-dot { stroke: var(--fig-surface); stroke-width: 2; transition: r 160ms; }
.fg-dot.is-sel { stroke: var(--ink-1); stroke-width: 2.5; }
.fg-hit { fill: transparent; cursor: pointer; }
.fg-hit:focus, .fg-hit-rect:focus { outline: none; stroke: var(--cyan); stroke-width: 2; }
.fg-hit-rect { fill: transparent; cursor: pointer; }
.fg-bar.is-sel { stroke: var(--ink-1); stroke-width: 1.5; }
.fg-bar.is-zero { fill: none; stroke: var(--fig-blue); stroke-width: 1.5; }
.fg-win-a { fill: var(--fig-blue); opacity: 0.8; }
.fg-win-b { fill: #3a3a37; }
.fg-win-sel { fill: none; stroke: var(--ink-1); stroke-width: 2; }
.fg-tickline { stroke: var(--ink-1); stroke-width: 1; opacity: 0.85; }
.fg-unused { stroke: var(--fig-grid); }
.fg-hatch { stroke: #3a3a37; stroke-width: 2; }
.fg-bracket, .fg-axisline { stroke: var(--ink-2); stroke-width: 1.5; fill: none; }
.fg-marker { stroke: var(--ink-1); stroke-width: 2; }
.fg-markhead { fill: var(--ink-1); }
.fg-marker.is-bad { stroke: var(--fig-orange); } .fg-markhead.is-bad { fill: var(--fig-orange); }
.str-blue { stroke: var(--fig-blue); } .str-orange { stroke: var(--fig-orange); } .str-aqua { stroke: var(--fig-aqua); } .str-ink { stroke: var(--ink-1); }
.fill-blue { fill: var(--fig-blue); } .fill-orange { fill: var(--fig-orange); } .fill-aqua { fill: var(--fig-aqua); } .fill-ink { fill: var(--ink-1); }
.fg-line.dashed { stroke-dasharray: 6 4; }

/* ---------- op budget (HTML bars) ---------- */
.fig-bars { display: grid; gap: var(--space-2); padding: var(--space-2) 0; }
.fig-bar-row { display: grid; grid-template-columns: minmax(8rem, 14rem) 1fr 3rem; align-items: center; gap: var(--space-3); padding: 0.3rem 0.4rem; border-radius: 8px; font: 0.8rem var(--font-mono); color: var(--ink-2); }
.fig-bar-row:hover, .fig-bar-row:focus-visible { background: rgba(255, 255, 255, 0.04); }
.fig-bar-label { text-align: right; }
.fig-bar-track { display: block; height: 20px; }
.fig-bar-fill { display: block; height: 100%; min-width: 3px; background: var(--fig-blue); border-radius: 2px; transform-origin: left; }
.fig-bar-val { color: var(--ink-1); font-variant-numeric: tabular-nums; }
@media (max-width: 640px) { .fig-bar-row { grid-template-columns: 1fr 3rem; } .fig-bar-label { grid-column: 1 / -1; text-align: left; } .fig-bar-track { grid-column: 1; } .fig-bar-val { grid-column: 2; } }

/* ---------- flow diagram ---------- */
.flow { display: grid; gap: var(--space-3); padding: var(--space-2) 0; }
.flow-region { --fig-region: var(--fig-blue); border: 2px solid var(--fig-region); border-radius: 14px; padding: var(--space-4); }
.flow-orange { --fig-region: var(--fig-orange); } .flow-aqua { --fig-region: var(--fig-aqua); }
.flow-rhead { margin: 0 0 var(--space-4); font: 0.74rem var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-2); }
.flow-rhead strong { color: var(--ink-1); }
.flow-nodes { display: flex; flex-wrap: wrap; gap: var(--space-4) 1.6rem; }
.flow-item { position: relative; flex: 1 1 9.5rem; max-width: 15rem; list-style: none; }
.flow-item:not(:last-child)::after { content: "→"; position: absolute; right: -1.35rem; top: 50%; translate: 0 -50%; color: var(--ink-3); pointer-events: none; }
.flow-node { width: 100%; height: 100%; display: grid; align-content: start; gap: 0.25rem; padding: 0.7rem 0.8rem; text-align: left; border: 1px solid var(--line-strong); border-radius: 10px; background: rgba(255, 255, 255, 0.03); color: var(--ink-1); font: inherit; font-size: 0.92rem; cursor: pointer; transition: border-color var(--t-fast), background var(--t-fast); }
.flow-node:hover { border-color: var(--ink-2); }
.flow-sub, .flow-ops { font: 0.72rem/1.45 var(--font-mono); color: var(--ink-2); }
.flow-ops { color: var(--ink-1); }
.flow-item.is-done .flow-node { border-color: var(--fig-region); }
.flow-item.is-active .flow-node { border-color: var(--ink-1); background: rgba(255, 255, 255, 0.09); box-shadow: 0 0 0 2px var(--fig-region); }
.flow-handoff { padding-left: var(--space-4); font: 0.76rem var(--font-mono); color: var(--ink-2); }
.flow-handoff::before { content: "↓  "; }

/* ---------- disk layout ---------- */
.disk { display: grid; gap: var(--space-3); padding: var(--space-2) 0; }
.disk-bar { display: flex; gap: 2px; min-height: 6rem; }
.disk-seg { flex: 1 1 0; min-width: 14px; display: grid; place-content: center; justify-items: center; gap: 2px; padding: 0.4rem 0.2rem; border: 1px solid var(--ink-3); border-radius: 6px; background: rgba(255, 255, 255, 0.03); color: var(--ink-1); font: 0.74rem/1.3 var(--font-mono); text-align: center; cursor: pointer; overflow: hidden; }
.disk-seg strong { font-weight: 600; }
.disk-seg span { color: var(--ink-2); }
.disk-seg.seg-vault { border-color: var(--fig-blue); background: rgba(57, 135, 229, 0.3); }
.disk-seg.seg-efi { border-color: var(--fig-orange); background: rgba(217, 89, 38, 0.3); }
.disk-seg.seg-gap { border-color: var(--ink-2); background: repeating-linear-gradient(45deg, #2c2c2a 0 4px, transparent 4px 8px); }
.disk-seg.seg-missing { border-style: dashed; background: transparent; }
.disk-seg.is-sel { outline: 2px solid var(--ink-1); outline-offset: 1px; }
.disk-seg:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.disk-legend { display: grid; gap: 0.3rem; font: 0.76rem var(--font-mono); color: var(--ink-2); }
.disk-legend li { display: flex; align-items: center; gap: 0.6em; }
.disk-legend li.is-sel { color: var(--ink-1); }
.disk-legend .fig-sw { height: 10px; width: 14px; border-radius: 3px; background: var(--ink-3); }
.disk-legend .seg-vault .fig-sw { background: var(--fig-blue); } .disk-legend .seg-efi .fig-sw { background: var(--fig-orange); }

/* ---------- 3D scenes ---------- */
.fig-3d { position: absolute; inset: 0; touch-action: pan-y; cursor: grab; border-radius: 8px; background: radial-gradient(70% 90% at 50% 40%, rgba(52, 245, 165, 0.06), transparent 70%), #0a0e14; border: 1px solid var(--line); overflow: hidden; }
.fig-3d:active { cursor: grabbing; }
.fig-3d:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.fig-canvas { display: block; width: 100%; height: 100%; }
.fig-overlay { position: absolute; left: 0.75rem; bottom: 0.75rem; max-width: calc(100% - 1.5rem); padding: 0.6rem 0.9rem; border: 1px solid var(--line-strong); border-radius: 10px; background: rgba(5, 7, 10, 0.88); font: 0.72rem/1.5 var(--font-mono); color: var(--ink-2); pointer-events: none; }
.fig-overlay[hidden] { display: none; }
@media (max-width: 640px) { .fig-overlay { font-size: 0.62rem; padding: 0.4rem 0.6rem; max-height: 46%; overflow: hidden; } }
.fig-overlay strong { color: var(--ink-1); display: block; margin-bottom: 0.3rem; }
.fig-overlay pre { margin: 0; white-space: pre-wrap; color: var(--ink-1); font: inherit; }
.fig-counter { margin: var(--space-2) 0 0; font: 700 1rem var(--font-mono); color: var(--ink-1); letter-spacing: 0.04em; }
.fig-hits { display: grid; gap: 0.15rem; margin: var(--space-2) 0; font: 0.76rem var(--font-mono); color: var(--ink-2); }
.fig-hits li::before { content: "●  "; color: var(--fig-orange); }
.fig-hits li.is-hit { color: var(--ink-1); }
.fig-hits li.is-hit::before { color: var(--fig-aqua); }
.ctf-md .fig .fig-counter { color: var(--ink-1); }
.ctf-md .fig ol.fig-hits { padding: 0; }

/* ---------- reveal (runs once; the shell gets .is-in when on screen) ---------- */
.fig .draw { stroke-dasharray: 1; stroke-dashoffset: 0; transition: stroke-dashoffset 1.2s var(--ease) 150ms; }
.fig:not(.is-in) .draw { stroke-dashoffset: 1; }
.fig .pop { transform-box: fill-box; transform-origin: center; transition: transform 420ms var(--ease) calc(var(--i, 0) * 70ms + 500ms), opacity 300ms calc(var(--i, 0) * 70ms + 500ms); }
.fig:not(.is-in) .pop { transform: scale(0); opacity: 0; }
.fig rect.grow { transform-box: fill-box; transform-origin: 50% 100%; transition: transform 700ms var(--ease) calc(var(--i, 0) * 45ms); }
.fig:not(.is-in) rect.grow { transform: scaleY(0); }
.fig .fig-bar-fill.grow { transition: transform 800ms var(--ease) calc(var(--i, 0) * 80ms); }
.fig:not(.is-in) .fig-bar-fill.grow { transform: scaleX(0); }
.fig .flow-item, .fig .disk-seg { transition: opacity 500ms var(--ease) calc(var(--i, 0) * 90ms), translate 500ms var(--ease) calc(var(--i, 0) * 90ms); }
.fig:not(.is-in) .flow-item, .fig:not(.is-in) .disk-seg { opacity: 0; translate: 0 10px; }

/* ---------- static (no-JS / pre-rendered) ---------- */
.fig-static { transform: none; }
.fig-static .fig-stage { aspect-ratio: auto; }
.fig-static .fig-stage > img { height: auto; }

@media (prefers-reduced-motion: reduce) {
  .fig, .fig * { transition: none !important; animation: none !important; }
  .fig { transform: none !important; }
  .fig:not(.is-in) .draw { stroke-dashoffset: 0; }
  .fig:not(.is-in) .pop, .fig:not(.is-in) rect.grow, .fig:not(.is-in) .fig-bar-fill.grow { transform: none; opacity: 1; }
  .fig:not(.is-in) .flow-item, .fig:not(.is-in) .disk-seg { opacity: 1; translate: none; }
}

/* ==========================================================================
   Challenge cover (reader header + write-up cards) and lightbox
   ========================================================================== */
.ctf-r-head > .ctf-cover, .wu-head > .ctf-cover { justify-self: stretch; }
.ctf-cover { --rx: 0deg; --ry: 0deg; position: relative; width: 100%; margin: 0 0 var(--space-8); }
.ctf-cover-frame { position: relative; display: block; width: 100%; padding: 0; border: 1px solid var(--line-strong); border-radius: 16px; overflow: hidden; background: #0a0e14; cursor: zoom-in;
  box-shadow: 0 0 0 1px rgba(52, 245, 165, 0.08), 0 0 56px rgba(52, 245, 165, 0.14), 0 24px 50px rgba(0, 0, 0, 0.45);
  transform: perspective(1200px) rotateX(var(--rx)) rotateY(var(--ry)); transition: transform 260ms ease-out, box-shadow var(--t-base); }
.ctf-cover-frame:hover { box-shadow: 0 0 0 1px rgba(52, 245, 165, 0.3), 0 0 72px rgba(52, 245, 165, 0.22), 0 24px 50px rgba(0, 0, 0, 0.45); }
.ctf-cover-frame::after { content: "click to enlarge"; position: absolute; right: 12px; bottom: 12px; padding: 0.2rem 0.6rem; border-radius: 999px; background: rgba(5, 7, 10, 0.82); border: 1px solid var(--line-strong); font: 0.68rem var(--font-mono); color: var(--text); pointer-events: none; }
.ctf-cover-label { position: absolute; top: 12px; left: 14px; z-index: 1; padding: 0.15rem 0.55rem; border-radius: 6px; background: rgba(5, 7, 10, 0.82); border: 1px solid var(--line); font: 0.68rem var(--font-mono); color: var(--text-muted); pointer-events: none; }
.ctf-cover picture, .ctf-cover img { display: block; width: 100%; }
.ctf-cover img { max-height: min(72vh, 680px); object-fit: contain; background-size: cover; background-position: center; }
.ctf-cover-banner svg { display: block; width: 100%; height: auto; }
.ctf-cover-credit { margin: var(--space-2) 0 0; font: 0.72rem var(--font-mono); color: var(--text-muted); }
@media (prefers-reduced-motion: reduce) { .ctf-cover-frame { transform: none !important; } }

.ctf-wu-thumb { display: block; margin: calc(-1 * var(--space-6)) calc(-1 * var(--space-6)) 0; border-radius: 15px 15px 0 0; overflow: hidden; aspect-ratio: 16 / 8; background: #0a0e14; border-bottom: 1px solid var(--line); }
.ctf-wu-thumb img, .ctf-wu-thumb svg { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top; }

.ctf-lightbox { position: fixed; inset: 0; z-index: 400; display: grid; grid-template-rows: auto 1fr; background: rgba(3, 5, 8, 0.94); opacity: 0; transition: opacity 200ms linear; }
.ctf-lightbox.is-open { opacity: 1; }
.ctf-lightbox[hidden] { display: none; }
.ctf-lb-bar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-3) var(--space-6); font: 0.78rem var(--font-mono); color: var(--text-muted); }
.ctf-lb-close { min-height: 44px; padding: 0 var(--space-4); border-radius: 999px; border: 1px solid var(--line-strong); background: transparent; color: var(--text); font: 0.8rem var(--font-mono); cursor: pointer; }
.ctf-lb-close:hover { border-color: var(--cyan); color: var(--cyan); }
.ctf-lb-body { overflow: auto; display: grid; place-items: start center; padding: 0 var(--space-6) var(--space-8); }
.ctf-lb-body img { max-width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); }