/* Layout: one reading column; the two parts of the port (recomp, decomp) as
   chapters, each opening with its figures, then its maps, then its detail. */
:root {
  --bg: #eef0ee;          /* fog over stone */
  --panel: #f8f9f7;
  --ink: #1b2120;
  --ink-2: #4b5552;
  --ink-3: #737c79;
  --line: #d3d8d5;
  --native: #3f7a4f;      /* moss: native code */
  --native-ink: #ffffff;
  --mips: #a9b1ad;        /* weathered stone: recompiled MIPS */
  --mips-ink: #1b2120;
  --runtime: #b8892c;     /* lichen ochre: runtime */
  --runtime-ink: #1b2120;
  --accent: #2f5d74;      /* dusk sky over the Forbidden Land */
  --tip: #ffffff;
  --display: "IBM Plex Sans Condensed", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --step--1: 0.8125rem; --step-0: 1rem; --step-1: 1.25rem; --step-2: 1.75rem; --step-3: 2.75rem;
  --r: 6px;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #141917; --panel: #1c2220; --ink: #e8ecea; --ink-2: #b4bdb9; --ink-3: #8a9490; --line: #2f3734;
  --native: #5fa06f; --native-ink: #0f1513; --mips: #56605c; --mips-ink: #e8ecea; --runtime: #d0a248; --runtime-ink: #141917;
  --accent: #7fb2cc; --tip: #232a28; color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #141917; --panel: #1c2220; --ink: #e8ecea; --ink-2: #b4bdb9; --ink-3: #8a9490; --line: #2f3734;
  --native: #5fa06f; --native-ink: #0f1513; --mips: #56605c; --mips-ink: #e8ecea; --runtime: #d0a248; --runtime-ink: #141917;
  --accent: #7fb2cc; --tip: #232a28; color-scheme: dark; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 var(--step-0)/1.55 var(--body); }
.wrap { max-width: 68rem; margin: 0 auto; padding-inline: max(16px, 4vw); padding-block: 2.5rem 4rem; display: grid; gap: 3.5rem; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--display); font-weight: 600; letter-spacing: 0.005em; text-wrap: balance; margin: 0; }
h1 { font-size: var(--step-3); line-height: 1.05; }
h2 { font-size: var(--step-2); line-height: 1.15; }
h3 { font-size: var(--step-1); line-height: 1.25; }
p { margin: 0; max-width: 68ch; }
.muted { color: var(--ink-2); }
.small { font-size: var(--step--1); color: var(--ink-2); }
.eyebrow { font: 600 var(--step--1)/1.2 var(--display); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); }
.mono { font-family: var(--mono); font-size: 0.92em; }
.num { font-variant-numeric: tabular-nums; }

header.top { display: grid; gap: 1rem; }
header.top nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; font: 500 var(--step--1)/1.2 var(--display); text-transform: uppercase; letter-spacing: 0.1em; }
header.top nav a { text-decoration: none; color: var(--ink-2); border-bottom: 1px solid var(--line); padding-bottom: 2px; }
header.top nav a:hover { color: var(--ink); border-color: var(--ink); }

.lede { display: grid; gap: 1.25rem; }
.split { display: grid; gap: 0.6rem; }
.split-bar { display: flex; height: 2.75rem; border-radius: var(--r); overflow: hidden; gap: 2px; background: var(--bg); }
.split-bar > div { display: flex; align-items: center; padding-inline: 0.6rem; font: 600 var(--step--1)/1 var(--display); white-space: nowrap; overflow: hidden; min-width: 0; }
.k-native { background: var(--native); color: var(--native-ink); }
.k-mips { background: var(--mips); color: var(--mips-ink); }
.k-runtime { background: var(--runtime); color: var(--runtime-ink); }
.k-accent { background: var(--accent); }
.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; font-size: var(--step--1); color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.legend i { width: 0.8rem; height: 0.8rem; border-radius: 2px; display: inline-block; }

.chapter { display: grid; gap: 1.75rem; }
.chapter-head { display: grid; gap: 0.6rem; border-top: 2px solid var(--ink); padding-top: 1rem; }
.chapter-head .row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 1rem; justify-content: space-between; }
.state { font: 600 var(--step--1)/1 var(--display); text-transform: uppercase; letter-spacing: 0.1em; padding: 0.35rem 0.6rem; border-radius: 999px; border: 1.5px solid currentColor; }
.state.done { color: var(--native); }
.state.going { color: var(--runtime); }

.figures { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.fig { background: var(--panel); padding: 1rem 1.1rem; display: grid; gap: 0.3rem; align-content: start; }
.fig .v { font: 600 var(--step-3)/1 var(--display); font-variant-numeric: tabular-nums; }
.fig .v small { font-size: 0.45em; font-weight: 500; color: var(--ink-2); margin-left: 0.15em; }
.fig .l { font-size: var(--step--1); color: var(--ink-2); line-height: 1.35; }

.pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 26rem), 1fr)); gap: 1.5rem; }
.block { display: grid; gap: 0.75rem; min-width: 0; align-content: start; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 1.1rem; display: grid; gap: 0.75rem; min-width: 0; }
.map { position: relative; width: 100%; }
.map svg { display: block; width: 100%; height: auto; }
.tip { position: absolute; pointer-events: none; background: var(--tip); color: var(--ink); border: 1px solid var(--line); border-radius: var(--r); padding: 0.45rem 0.6rem; font-size: var(--step--1); line-height: 1.4; max-width: 17rem; box-shadow: 0 4px 16px rgb(0 0 0 / 0.12); z-index: 3; }
.tip b { font-weight: 600; }
.tip .t { color: var(--ink-2); }

.crumb { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 0.75rem; min-height: 2rem; font-size: var(--step--1); color: var(--ink-2); }
.crumb button { font: 600 var(--step--1)/1 var(--display); text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 999px; padding: 0.4rem 0.75rem; cursor: pointer; }
.crumb button:hover { border-color: var(--ink-3); }
.crumb b { color: var(--ink); font-family: var(--display); font-size: var(--step-0); }
.map g.click { cursor: pointer; }
.map g.click:hover > rect:first-child { stroke: var(--ink); }
.explain { display: grid; gap: 0.5rem; }
.explain p { color: var(--ink-2); }
.callout { border-left: 3px solid var(--native); padding: 0.2rem 0 0.2rem 0.9rem; display: grid; gap: 0.35rem; }

.table-box { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); }
table { width: 100%; border-collapse: collapse; font-size: var(--step--1); }
th { text-align: left; font: 600 var(--step--1)/1.2 var(--display); text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
td.r, th.r { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.meter { display: inline-block; width: 5rem; height: 0.45rem; background: var(--line); border-radius: 2px; vertical-align: middle; margin-right: 0.4rem; overflow: hidden; }
.meter > i { display: block; height: 100%; }
.chip { display: inline-block; font: 500 0.72rem/1.4 var(--display); text-transform: uppercase; letter-spacing: 0.06em; padding: 0 0.4rem; border-radius: 3px; white-space: nowrap; }

.rounds { display: grid; gap: 0; border-left: 2px solid var(--line); margin-left: 0.35rem; }
.round { position: relative; padding: 0 0 1.1rem 1.25rem; display: grid; gap: 0.2rem; }
.round::before { content: ""; position: absolute; left: -0.45rem; top: 0.35rem; width: 0.7rem; height: 0.7rem; border-radius: 50%; background: var(--panel); border: 2px solid var(--accent); }
.round.now::before { background: var(--runtime); border-color: var(--runtime); }
.round .h { display: flex; flex-wrap: wrap; gap: 0.25rem 0.75rem; align-items: baseline; }
.round .h b { font: 600 var(--step-1)/1.2 var(--display); }
.round p { color: var(--ink-2); }
.round .res { color: var(--ink); font-size: var(--step--1); }

.chart { position: relative; }
.chart svg { display: block; width: 100%; height: auto; }
.chart text { fill: var(--ink-2); font: 400 11px var(--body); }
.empty { color: var(--ink-2); font-style: italic; }
footer { border-top: 1px solid var(--line); padding-top: 1rem; display: grid; gap: 0.4rem; }
@media (prefers-reduced-motion: no-preference) { .split-bar > div { transition: flex-basis 0.6s ease; } }

/* Hero: the forest ride, full bleed, text on a fixed dark scrim (same in both themes). */
.hero { position: relative; isolation: isolate; min-height: clamp(26rem, 52vw, 36rem); display: grid; align-items: end; color: #f1f3ef; overflow: hidden; background: #1d2622; }
.hero-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 60% 40%; z-index: -2; }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgb(12 17 15 / 0.82) 0%, rgb(12 17 15 / 0.55) 45%, rgb(12 17 15 / 0.05) 80%), linear-gradient(0deg, var(--bg) 0%, rgb(0 0 0 / 0) 22%); }
.hero-in { max-width: 68rem; width: 100%; margin: 0 auto; padding-inline: max(16px, 4vw); padding-block: 3rem 4.5rem; display: grid; gap: 1rem; }
.hero-in p { max-width: 58ch; color: #d6ddd8; }
.hero-in b { color: #ffffff; }
.hero h1 { font-size: clamp(2.6rem, 7vw, 4.75rem); line-height: 0.95; letter-spacing: -0.01em; text-shadow: 0 2px 24px rgb(0 0 0 / 0.35); }
.eyebrow.on-dark { color: #b9c7bf; }
.hero nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; font: 500 var(--step--1)/1.2 var(--display); text-transform: uppercase; letter-spacing: 0.1em; }
.hero nav a { color: #e6ece8; text-decoration: none; border-bottom: 1px solid rgb(255 255 255 / 0.35); padding-bottom: 2px; }
.hero nav a:hover { border-color: #ffffff; }
.wrap { padding-block: 0.5rem 4rem; }

/* Chapter banners: a wide still, captioned like a museum plate. */
.banner { margin: 0; display: grid; gap: 0.5rem; }
.banner img { width: 100%; height: clamp(9rem, 24vw, 15rem); object-fit: cover; border-radius: var(--r); display: block; background: var(--line); }
.banner figcaption { font-size: var(--step--1); color: var(--ink-3); font-style: italic; max-width: 70ch; }

/* Gallery: two portrait arts and two wide stills. */
.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); gap: 1rem; }
.gallery figure { margin: 0; display: grid; gap: 0.4rem; align-content: start; }
.gallery img { width: 100%; height: 22rem; object-fit: cover; border-radius: var(--r); display: block; background: var(--line); }
.gallery figcaption { font-size: var(--step--1); color: var(--ink-3); }
@media (min-width: 50rem) { .gallery { grid-template-columns: 1fr 1fr 1.6fr; } .gallery figure:nth-child(3) { grid-column: 3; grid-row: 1; } .gallery figure:nth-child(4) { grid-column: 1 / -1; } .gallery figure:nth-child(4) img { height: 16rem; } }
@media (prefers-reduced-motion: no-preference) { .hero-img { animation: drift 30s ease-in-out infinite alternate; } @keyframes drift { from { transform: scale(1.04) translateX(0); } to { transform: scale(1.08) translateX(-1.5%); } } }

/* Motion: everything rests visible; these only play on the way in. */
@media (prefers-reduced-motion: no-preference) {
  .hero-in > * { animation: up 0.9s cubic-bezier(.2,.7,.2,1) both; }
  .hero-in > *:nth-child(2) { animation-delay: 0.08s; } .hero-in > *:nth-child(3) { animation-delay: 0.16s; } .hero-in > *:nth-child(4) { animation-delay: 0.24s; }
  @keyframes up { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
  .split-bar > div { transition: flex-basis 1.1s cubic-bezier(.2,.7,.2,1); }
  svg.enter g.a, svg.enter g.l { animation: tile 0.55s cubic-bezier(.2,.7,.2,1) both; transform-box: fill-box; transform-origin: center; }
  @keyframes tile { from { opacity: 0; transform: scale(0.92); } to { opacity: 1; transform: none; } }
  .map g.click > rect:first-child { transition: stroke 0.2s; }
  .map g.l > rect { transition: filter 0.2s; }
  .map g.l:hover > rect { filter: brightness(1.12) saturate(1.1); }
  .rise { opacity: 0; transform: translateY(18px); }
  .rise.risen { opacity: 1; transform: none; transition: opacity 0.7s ease, transform 0.7s cubic-bezier(.2,.7,.2,1); }
  .banner img, .gallery img { transition: transform 1.2s cubic-bezier(.2,.7,.2,1), filter 0.6s; }
  .banner:hover img, .gallery figure:hover img { transform: scale(1.025); filter: saturate(1.08); }
  .banner, .gallery figure { overflow: hidden; border-radius: var(--r); }
  .round.now::before { animation: pulse 1.8s ease-in-out infinite; }
  @keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--runtime) 55%, transparent); } 50% { box-shadow: 0 0 0 7px color-mix(in srgb, var(--runtime) 0%, transparent); } }
  .meter > i { animation: grow 1.2s cubic-bezier(.2,.7,.2,1) both; transform-origin: left; }
  @keyframes grow { from { transform: scaleX(0); } to { transform: none; } }
}
/* How to read the page */
.howto { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); gap: 0.75rem; }
.howto > div { display: grid; grid-template-columns: auto 1fr; gap: 0.15rem 0.6rem; align-items: start; padding: 0.8rem 0.9rem; background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); }
.howto i { grid-row: span 2; width: 0.9rem; height: 0.9rem; border-radius: 3px; margin-top: 0.2rem; }
.howto b { font: 600 var(--step-0)/1.25 var(--display); }
.howto span { font-size: var(--step--1); color: var(--ink-2); grid-column: 2; }
.howto .click { width: 0.9rem; height: 0.9rem; border: 2px solid var(--ink-2); border-radius: 50%; background: transparent; }

/* Lightbox: the whole image, fitted to any screen. */
img.zoomable { cursor: zoom-in; }
img.zoomable:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
html.lb-open { overflow: hidden; }
.lightbox { padding: 0; border: 0; background: transparent; color: #eef1ee; max-width: 100vw; max-height: 100dvh; width: 100vw; height: 100dvh; margin: 0; }
.lightbox[open] { display: grid; grid-template-rows: 1fr auto; place-items: center; gap: 0.75rem; padding: max(16px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px)) max(16px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px)); }
.lightbox::backdrop { background: rgb(8 11 10 / 0.88); backdrop-filter: blur(4px); }
.lightbox figure { margin: 0; display: grid; gap: 0.6rem; justify-items: center; min-height: 0; max-height: 100%; }
.lightbox img { max-width: min(100%, 1200px); max-height: calc(100dvh - 9rem); width: auto; height: auto; object-fit: contain; border-radius: var(--r); box-shadow: 0 10px 40px rgb(0 0 0 / 0.5); }
.lightbox figcaption { font-size: var(--step--1); color: #c9d1cc; text-align: center; max-width: 60ch; }
.lb-bar { display: flex; align-items: center; gap: 0.75rem; }
.lb-bar button { font: 600 var(--step-0)/1 var(--display); color: #eef1ee; background: rgb(255 255 255 / 0.1); border: 1px solid rgb(255 255 255 / 0.25); border-radius: 999px; min-width: 2.75rem; height: 2.75rem; padding: 0 1rem; cursor: pointer; }
.lb-bar button:hover { background: rgb(255 255 255 / 0.2); }
.lb-bar button:focus-visible { outline: 2px solid #ffffff; outline-offset: 2px; }
.lb-bar span { font-size: var(--step--1); color: #c9d1cc; min-width: 3.5rem; text-align: center; }
@media (prefers-reduced-motion: no-preference) { .lightbox[open] img { animation: lbin 0.35s cubic-bezier(.2,.7,.2,1); } @keyframes lbin { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: none; } } }