/* The review board every page shares: warm paper, ink, one blue. */
:root {
  --page: #f6f4ef;
  --card: #ffffff;
  --ink: #1b1a17;
  --muted: #6d6a62;
  --faint: #78746b;
  --line: rgba(27, 26, 23, 0.09);
  --fill: rgba(27, 26, 23, 0.05);
  --blue: #3f7fc4;
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --out: cubic-bezier(0.22, 1, 0.36, 1);
  --in: cubic-bezier(0.55, 0, 1, 0.45);
  --in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --shadow-card: 0 1px 2px rgba(27, 26, 23, 0.04), 0 12px 32px -18px rgba(27, 26, 23, 0.18);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --page: #141412; --card: #1d1c1a; --ink: #f1eee7; --muted: #a29e94; --faint: #8f8b82;
    --line: rgba(241, 238, 231, 0.09); --fill: rgba(241, 238, 231, 0.06); --blue: #7eb3e6;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px -18px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --page: #141412; --card: #1d1c1a; --ink: #f1eee7; --muted: #a29e94; --faint: #8f8b82;
  --line: rgba(241, 238, 231, 0.09); --fill: rgba(241, 238, 231, 0.06); --blue: #7eb3e6;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px -18px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 400 14px/1.5 'Geist', ui-sans-serif, system-ui, sans-serif;
}
a { color: inherit; }
button { font: inherit; color: inherit; }

.wrap { max-width: 1400px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 720px) { .wrap { padding: 0 16px; } }

/* header */
.top {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in oklab, var(--page) 86%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.brand .pbot { width: 34px; }
.brand .word { font: 700 22px/1 'Gabarito', sans-serif; letter-spacing: -0.02em; }
.nav { display: flex; gap: 2px; margin-left: 8px; }
.nav a {
  text-decoration: none; padding: 6px 12px; border-radius: 999px; color: var(--muted);
  font-weight: 500; transition: background-color 0.15s, color 0.15s;
}
.nav a:hover { color: var(--ink); background: var(--fill); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--fill); }
.top .spacer { flex: 1; }
@media (max-width: 720px) { .top .wrap { gap: 8px; } .nav { margin-left: 0; } .nav a { padding: 6px 7px; font-size: 13px; } .brand .word { display: none; } }

/* page intro: left aligned, quiet */
.intro { padding: 56px 0 28px; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 40px; align-items: end; }
.intro h1 { font: 600 44px/1.02 'Geist', sans-serif; letter-spacing: -0.035em; margin: 0; }
.intro h1 .count { color: var(--faint); font-weight: 500; }
.intro p { color: var(--muted); margin: 0; max-width: 60ch; font-size: 15px; }
@media (max-width: 860px) { .intro { grid-template-columns: 1fr; gap: 14px; padding-top: 36px; } .intro h1 { font-size: 34px; } }

.label { font: 500 11px/1 'Geist Mono', ui-monospace, monospace; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }
.mono { font-family: 'Geist Mono', ui-monospace, monospace; }

/* controls */
.controls { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; padding: 14px 0 22px; border-bottom: 1px solid var(--line); margin-bottom: 28px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 5px 12px;
  font-size: 13px; cursor: pointer; color: var(--muted);
  transition: background-color 0.15s, color 0.15s, border-color 0.15s, transform 0.12s;
}
.chip:hover { color: var(--ink); }
.chip:active { transform: scale(0.97); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--page); border-color: var(--ink); }
.chip .n { opacity: 0.55; margin-left: 4px; font-variant-numeric: tabular-nums; }
.swatches { display: flex; gap: 5px; flex-wrap: wrap; }
.swatch {
  width: 24px; height: 24px; border-radius: 8px; border: 1px solid var(--line); cursor: pointer; padding: 0;
  display: grid; place-items: center; transition: transform 0.12s;
}
.swatch:active { transform: scale(0.92); }
.swatch i { width: 10px; height: 10px; border-radius: 4px; display: block; }
.swatch[aria-pressed="true"] { outline: 2px solid var(--ink); outline-offset: 2px; }
.field { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; }
.field input[type="range"] { accent-color: var(--ink); width: 110px; }
.toggle { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); cursor: pointer; }
.toggle input { accent-color: var(--ink); }

footer { padding: 60px 0 80px; color: var(--faint); font-size: 13px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

/* ---- black on white / white on black --------------------------------------
 * .ink-stage is any surface the bot is shown on in plain black and white. It
 * follows the header toggle; the page chrome follows it too (data-theme). */
:root { --ink-bg: #fbfaf7; --ink-fg: #161614; --ink-shadow: rgba(22, 22, 20, 0.12); }
:root[data-ink="dark"] { --ink-bg: #131312; --ink-fg: #f4f2ec; --ink-shadow: rgba(244, 242, 236, 0.1); }
.ink-stage {
  --bg: var(--ink-bg); --body: var(--ink-fg); --face: var(--ink-bg); --word: var(--ink-fg);
  --paper: var(--ink-bg); --shadow: var(--ink-shadow); --accent-ink: var(--ink-bg);
}

.ink-toggle { margin-left: auto; display: flex; padding: 3px; gap: 2px; border-radius: 12px; background: var(--fill); border: 1px solid var(--line); }
.ink-toggle button {
  display: flex; align-items: center; gap: 7px; border: 0; background: transparent; cursor: pointer;
  padding: 5px 10px 5px 6px; border-radius: 9px; font-size: 13px; color: var(--muted); min-height: 30px;
  transition: background-color 0.15s, color 0.15s, transform 0.12s;
}
.ink-toggle button:active { transform: scale(0.97); }
.ink-toggle button[aria-pressed="true"] { background: var(--card); color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1); }
.ink-toggle button:focus-visible { outline: 2px solid var(--blue); outline-offset: 1px; }
.ink-toggle .sw { width: 18px; height: 18px; border-radius: 6px; display: grid; place-items: center; border: 1px solid var(--line); }
.ink-toggle .sw::after { content: ''; width: 8px; height: 8px; border-radius: 3px; }
.ink-toggle .sw-l { background: #fbfaf7; } .ink-toggle .sw-l::after { background: #161614; }
.ink-toggle .sw-d { background: #161614; } .ink-toggle .sw-d::after { background: #fbfaf7; }
@media (max-width: 860px) { .ink-toggle .t { display: none; } .ink-toggle button { padding: 5px; } }

/* bots scrolled out of view stop; only what you can see animates */
.is-off .pbot, .is-off .pbot * { animation-play-state: paused !important; }
.stage { contain: paint; }
/* the screen-face bot in black and white: a pale panel with ink features */
.ink-stage { --screen: var(--ink-bg); --glow: var(--ink-fg); }
/* the little logo in the header follows the switch */
.brand { --body: var(--ink-fg); --face: var(--ink-bg); }