/* Sankofa Systems — white-cube gallery. Palette: gallery white / ink; the art carries colour. */

@font-face {
  font-family: 'Instrument Serif';
  src: url('../fonts/instrument.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Instrument Serif';
  src: url('../fonts/instrument-italic.woff2') format('woff2');
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Sans';
  src: url('../fonts/plex.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}

:root {
  --wall: #F4F4F2;
  --wall-2: #ECECE8;
  --ink: #181818;
  --ink-60: rgba(24,24,24,0.62);
  --ink-30: rgba(24,24,24,0.30);
  --ink-12: rgba(24,24,24,0.12);
  --gold: #C1761F;
  --indigo: #1D2757;
  --serif: 'Instrument Serif', Georgia, serif;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --measure: 62ch;
  --space: clamp(4.5rem, 10vw, 9rem);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--wall);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--indigo); color: var(--wall); }

:focus-visible { outline: 2px solid var(--indigo); outline-offset: 3px; border-radius: 1px; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--wall);
  padding: 0.6rem 1.1rem; font-size: 0.85rem; text-decoration: none;
}
.skip:focus { left: 0.75rem; top: 0.75rem; }

img, canvas { max-width: 100%; display: block; }

/* ---------------- type ---------------- */

h1, h2, h3 { font-family: var(--serif); font-weight: 400; line-height: 1.04; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.9rem, 8.5vw, 6.4rem); }
h2 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
h3 { font-size: clamp(1.35rem, 2.4vw, 1.75rem); }
em, i { font-family: var(--serif); font-style: italic; }

.kicker {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--ink-60); margin-bottom: 1.1rem;
  display: flex; align-items: center; gap: 0.85rem;
}
.kicker::before { content: ''; width: 2.2rem; height: 1px; background: var(--ink-30); }

.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--ink-60); max-width: var(--measure); }

a { color: inherit; text-decoration-color: var(--ink-30); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--gold); }

/* ---------------- layout ---------------- */

.wrap { width: min(1180px, calc(100% - clamp(2.4rem, 6vw, 6rem))); margin-inline: auto; }
section { padding-block: var(--space); }

/* ---------------- header ---------------- */

.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--wall) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ink-12);
}
.site-head .wrap {
  display: flex; align-items: baseline; justify-content: space-between;
  padding-block: 0.95rem; gap: 1rem;
}
.wordmark {
  font-family: var(--serif); font-size: 1.3rem; text-decoration: none; white-space: nowrap;
}
.wordmark .sys { font-style: italic; color: var(--ink-60); }
.site-nav { display: flex; gap: clamp(0.9rem, 2vw, 1.6rem); flex-wrap: wrap; justify-content: flex-end; }
.site-nav a {
  font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase;
  text-decoration: none; color: var(--ink-60); padding-block: 0.2rem;
}
.site-nav a:hover, .site-nav a:focus-visible { color: var(--ink); }
@media (max-width: 720px) { .site-nav a.hide-s { display: none; } }

/* ---------------- hero ---------------- */

.hero { padding-block: clamp(3.5rem, 7vw, 6rem) var(--space); }
.hero h1 { max-width: 15ch; }
.hero h1 em { display: block; color: var(--indigo); }
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(2.5rem, 6vw, 6rem); align-items: start; margin-top: clamp(2rem, 4vw, 3rem);
}
.hero-copy { max-width: 44ch; }
.hero-copy .lede { margin-top: 1.4rem; }
.hero-note { margin-top: 2rem; font-size: 0.85rem; color: var(--ink-60); border-left: 2px solid var(--gold); padding-left: 1rem; max-width: 38ch; }
.hero-links { margin-top: 2.2rem; display: flex; gap: 1.6rem; flex-wrap: wrap; align-items: center; }
@media (max-width: 880px) { .hero-grid { grid-template-columns: 1fr; } }

/* ---------------- works & frames ---------------- */

.work { display: grid; grid-template-columns: minmax(0, 1fr) 264px; gap: clamp(1.6rem, 3.4vw, 3rem); align-items: end; }
.work.flip { grid-template-columns: 264px minmax(0, 1fr); }
.work.flip .frame { order: 2; }
.work.flip .work-side { order: 1; }
@media (max-width: 880px) {
  .work, .work.flip { grid-template-columns: 1fr; align-items: start; }
  .work.flip .frame { order: 0; }
  .work.flip .work-side { order: 1; }
}

.frame {
  background: #FDFDFB;
  border: 1px solid var(--ink);
  padding: clamp(0.8rem, 1.8vw, 1.4rem);
  box-shadow:
    0 1px 2px rgba(24,24,24,0.10),
    0 18px 42px -18px rgba(24,24,24,0.38),
    0 44px 80px -40px rgba(24,24,24,0.28);
}
.frame canvas { width: 100%; height: auto; background: var(--wall-2); }
.frame canvas.is-refreshing { opacity: 0; }
@media (prefers-reduced-motion: no-preference) {
  .frame canvas { transition: opacity 320ms ease; }
}

.work-side { display: flex; flex-direction: column; gap: 1.4rem; }

/* museum label */
.label {
  border-top: 1px solid var(--ink); padding-top: 0.9rem;
  font-size: 0.82rem; line-height: 1.55;
}
.label-artist { letter-spacing: 0.18em; font-size: 0.68rem; color: var(--ink-60); }
.label-title { font-family: var(--serif); font-size: 1.35rem; line-height: 1.2; margin-top: 0.25rem; }
.label-title .t { font-style: italic; }
.label-meta { margin-top: 0.45rem; color: var(--ink-60); }
.label-meta .seed { font-variant-numeric: tabular-nums; color: var(--ink); }
.label-media { color: var(--ink-60); font-size: 0.76rem; margin-top: 0.15rem; }

/* controls — gallery hardware */
.controls { display: flex; flex-direction: column; gap: 0.85rem; }
.controls .row { display: flex; gap: 0.6rem; flex-wrap: wrap; }

.btn {
  font-family: var(--sans); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase;
  background: none; border: 1px solid var(--ink); color: var(--ink);
  padding: 0.62rem 1.05rem; cursor: pointer; border-radius: 999px;
}
@media (prefers-reduced-motion: no-preference) { .btn { transition: background 140ms ease, color 140ms ease; } }
.btn:hover, .btn:focus-visible { background: var(--ink); color: var(--wall); }
.btn.gold { border-color: var(--gold); color: var(--gold); }
.btn.gold:hover, .btn.gold:focus-visible { background: var(--gold); color: var(--wall); }

.param { display: block; font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-60); }
.param .param-name { display: block; margin-bottom: 0.35rem; }

input[type='range'] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 20px;
  background: transparent; cursor: pointer;
}
input[type='range']::-webkit-slider-runnable-track { height: 1px; background: var(--ink-30); }
input[type='range']::-moz-range-track { height: 1px; background: var(--ink-30); }
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; margin-top: -6.5px;
  border-radius: 50%; background: var(--wall); border: 1.5px solid var(--ink);
}
input[type='range']::-moz-range-thumb {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--wall); border: 1.5px solid var(--ink);
}
input[type='range']:hover::-webkit-slider-thumb, input[type='range']:focus-visible::-webkit-slider-thumb { background: var(--ink); }
input[type='range']:hover::-moz-range-thumb, input[type='range']:focus-visible::-moz-range-thumb { background: var(--ink); }

/* ---------------- rooms ---------------- */

.room { border-top: 1px solid var(--ink-12); position: relative; }
.room-head { display: flex; align-items: baseline; gap: clamp(1rem, 3vw, 2.4rem); margin-bottom: clamp(2.4rem, 5vw, 4rem); flex-wrap: wrap; }
.room-num {
  font-family: var(--serif); font-style: italic;
  font-size: clamp(4rem, 10vw, 8rem); line-height: 0.9; color: var(--ink-12);
  user-select: none;
}
.room-head h2 { max-width: 14ch; }
.room-head .lede { flex-basis: 100%; max-width: 58ch; }

/* studies shelf */
.studies { margin-top: clamp(2.6rem, 5vw, 4rem); }
.studies-title { font-size: 0.72rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-60); margin-bottom: 1.2rem; }
.studies-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1rem, 2.6vw, 2rem); }
@media (max-width: 620px) { .studies-row { grid-template-columns: repeat(2, 1fr); } .studies-row .study:nth-child(3) { display: none; } }

.study {
  background: none; border: none; text-align: left; cursor: pointer; padding: 0;
  font-family: var(--sans); color: inherit;
}
.study .mini-frame {
  background: #FDFDFB; border: 1px solid var(--ink-30); padding: 0.5rem;
  box-shadow: 0 10px 26px -14px rgba(24,24,24,0.34);
}
.mini-frame { display: block; }
.mini-frame canvas { width: 100%; height: auto; }
@media (prefers-reduced-motion: no-preference) {
  .study .mini-frame { transition: transform 160ms ease, border-color 160ms ease; }
  .study:hover .mini-frame, .study:focus-visible .mini-frame { transform: translateY(-4px); border-color: var(--ink); }
}
.study:hover .mini-frame, .study:focus-visible .mini-frame { border-color: var(--ink); }
.study .study-cap { margin-top: 0.6rem; font-size: 0.72rem; color: var(--ink-60); }
.study .study-cap .study-seed { font-variant-numeric: tabular-nums; color: var(--ink); }
.study .study-hang { color: var(--gold); }

/* ---------------- algorithms section ---------------- */

.alg-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1.4rem, 3vw, 2.6rem); margin-top: clamp(2.4rem, 5vw, 3.6rem); }
@media (max-width: 880px) { .alg-grid { grid-template-columns: 1fr; } }
.alg-card { border: 1px solid var(--ink-12); background: #FBFBF9; padding: clamp(1.4rem, 2.6vw, 2rem); display: flex; flex-direction: column; gap: 0.9rem; }
.alg-card h3 em { color: var(--indigo); }
.alg-card p { font-size: 0.92rem; color: var(--ink-60); }
.alg-card .math {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace; font-size: 0.8rem;
  background: var(--wall-2); border-left: 2px solid var(--gold);
  padding: 0.7rem 0.9rem; color: var(--ink); overflow-x: auto; white-space: pre;
}
.alg-card a { font-size: 0.82rem; margin-top: auto; }

/* ---------------- studio & note ---------------- */

.studio-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: clamp(2.4rem, 6vw, 6rem); }
@media (max-width: 880px) { .studio-grid { grid-template-columns: 1fr; } }
.studio-grid p + p { margin-top: 1rem; }
.studio-grid p { max-width: var(--measure); }

.note-card {
  border: 1px solid var(--ink); background: #FBFBF9; padding: clamp(1.4rem, 3vw, 2.2rem);
  align-self: start;
}
.note-card h3 { margin-bottom: 0.8rem; }
.note-card p { font-size: 0.9rem; color: var(--ink-60); }
.note-card p + p { margin-top: 0.8rem; }

/* ---------------- commission form ---------------- */

.commission { background: var(--ink); color: var(--wall); }
.commission .kicker { color: rgba(244,244,242,0.6); }
.commission .kicker::before { background: rgba(244,244,242,0.3); }
.commission .lede { color: rgba(244,244,242,0.68); }
.commission ::selection { background: var(--gold); color: var(--ink); }
.commission-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(2.4rem, 6vw, 6rem); margin-top: 1rem; }
@media (max-width: 880px) { .commission-grid { grid-template-columns: 1fr; } }
.commission form { display: grid; gap: 1.3rem; }
.commission form[hidden] { display: none; }
.field { display: grid; gap: 0.4rem; }
.field label { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(244,244,242,0.6); }
.field input, .field textarea, .field select {
  background: none; border: none; border-bottom: 1px solid rgba(244,244,242,0.35);
  color: var(--wall); font-family: var(--sans); font-size: 1rem; padding: 0.5rem 0;
  border-radius: 0;
}
.field textarea { resize: vertical; min-height: 6rem; }
.field input:focus-visible, .field textarea:focus-visible, .field select:focus-visible {
  outline: none; border-bottom-color: var(--gold);
}
.field select { appearance: none; cursor: pointer; }
.field option { color: var(--ink); }
.commission .btn { border-color: var(--wall); color: var(--wall); justify-self: start; }
.commission .btn:hover, .commission .btn:focus-visible { background: var(--wall); color: var(--ink); }
.form-success { border: 1px solid var(--gold); padding: 1.6rem; font-size: 0.95rem; }
.form-success strong { font-family: var(--serif); font-size: 1.3rem; font-weight: 400; display: block; margin-bottom: 0.4rem; }
.hp { position: absolute; left: -9999px; }
.commission-aside p { font-size: 0.92rem; color: rgba(244,244,242,0.68); max-width: 42ch; }
.commission-aside p + p { margin-top: 1rem; }
.commission-aside strong { color: var(--wall); font-weight: 400; font-family: var(--serif); font-style: italic; font-size: 1.05rem; }

/* ---------------- footer ---------------- */

.site-foot { border-top: 1px solid var(--ink-12); padding-block: 2.6rem; font-size: 0.82rem; color: var(--ink-60); }
.site-foot .wrap { display: flex; justify-content: space-between; gap: 1.4rem; flex-wrap: wrap; }
.site-foot nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.site-foot a { text-decoration-color: var(--ink-12); }

/* ---------------- reveal ---------------- */

.reveal { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(22px); transition: opacity 640ms ease, transform 640ms cubic-bezier(0.2, 0.7, 0.2, 1); }
  .reveal.in { opacity: 1; transform: none; }
}

/* ---------------- guide & process prose ---------------- */

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.1rem; }
.prose h2 { margin-top: 3.4rem; }
.prose h3 { margin-top: 2.4rem; }
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose li + li { margin-top: 0.45rem; }
.prose pre {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace; font-size: 0.8rem; line-height: 1.6;
  background: var(--wall-2); border-left: 2px solid var(--gold);
  padding: 1rem 1.2rem; overflow-x: auto;
}
.prose code { font-family: ui-monospace, 'SF Mono', Menlo, monospace; font-size: 0.86em; background: var(--wall-2); padding: 0.1em 0.35em; }
.prose pre code { background: none; padding: 0; }
.prose blockquote { border-left: 2px solid var(--ink); padding-left: 1.2rem; font-family: var(--serif); font-style: italic; font-size: 1.15rem; color: var(--ink-60); }
.prose hr { border: none; border-top: 1px solid var(--ink-12); margin-block: 2.6rem; }
.page-hero { padding-block: clamp(3.5rem, 7vw, 5.5rem) clamp(2rem, 4vw, 3rem); border-bottom: 1px solid var(--ink-12); }
.page-hero h1 { font-size: clamp(2.6rem, 6.5vw, 4.6rem); max-width: 18ch; }
.page-hero .lede { margin-top: 1.2rem; }
.pass-log { border: 1px solid var(--ink-12); background: #FBFBF9; padding: 1.4rem 1.6rem; }
.pass-log h3 { margin-top: 0 !important; font-size: 1.15rem; }
.pass-log + .pass-log { margin-top: 1rem; }
.pass-log ul { margin-top: 0.7rem; }

@media print {
  .site-head, .controls, .studies, .site-foot nav { display: none; }
  .reveal { opacity: 1 !important; transform: none !important; }
}