/* One page, two themes, no framework. */

:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --ink: #1b1a18;
  --muted: #5f5b55;
  --line: #e3ded6;
  --accent: #8a4b2a;
  --accent-soft: #f3e6dd;
  --ok: #2f6d4f;
  --warn: #8a5a10;
  --warn-soft: #fdf4e3;
  --code-bg: #f4f1ec;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161513;
    --panel: #1e1d1a;
    --ink: #ece8e1;
    --muted: #a29b90;
    --line: #322f2a;
    --accent: #d99a6c;
    --accent-soft: #2c231d;
    --ok: #7fc4a0;
    --warn: #e0b26a;
    --warn-soft: #2a2318;
    --code-bg: #131210;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

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

.top {
  border-bottom: 1px solid var(--line);
  padding: 44px 0 30px;
  background: var(--panel);
}

.top h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: -0.02em;
  font-weight: 650;
}

.tagline {
  margin: 10px 0 18px;
  max-width: 58ch;
  color: var(--muted);
  font-size: 1.02rem;
}

.top nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.92rem; }

/* -- sections ------------------------------------------------------------ */

main { padding: 40px 20px 10px; }

section { margin: 0 0 52px; }

h2 {
  font-size: 1.28rem;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

h3 { font-size: 0.98rem; margin: 0 0 10px; }

p { margin: 0 0 14px; max-width: 70ch; }

.lead { color: var(--muted); }

/* -- the console --------------------------------------------------------- */

.console {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 56px;
}

.console-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.console-head h2 { margin: 0; }

.examples { display: flex; gap: 8px; flex-wrap: wrap; }

.chip {
  font: inherit;
  font-size: 0.82rem;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

textarea {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.6;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--code-bg);
  color: var(--ink);
  resize: vertical;
  tab-size: 2;
}

textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0;
  flex-wrap: wrap;
}

button.primary, button.ghost, .button {
  font: inherit;
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--accent);
  text-decoration: none;
  display: inline-block;
}

button.primary, .button { background: var(--accent); color: var(--bg); }
button.ghost, .button.ghost { background: transparent; color: var(--accent); }
button:disabled { opacity: 0.55; cursor: default; }

.state { font-size: 0.82rem; color: var(--muted); }

.out {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  margin: 0;
  min-height: 5.5em;
  max-height: 26em;
  overflow: auto;
  white-space: pre;
}

.out[data-kind="erro"] { border-color: var(--warn); }

.fineprint {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 14px 0 0;
  max-width: none;
}

/* -- number cards -------------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 14px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
}

.card .big {
  font-size: 1.9rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 0 0 4px;
  line-height: 1.1;
}

.card .of { font-size: 1rem; font-weight: 400; color: var(--muted); }
.card .small { margin: 0 0 12px; font-size: 0.9rem; }

.card .note {
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin: 0;
}

/* The caveat sits against the number it qualifies, not in a footnote. */
.card .note.warn {
  background: var(--warn-soft);
  border: 1px solid var(--warn);
  border-radius: 6px;
  padding: 9px 11px;
  color: var(--ink);
}

/* -- diagram ------------------------------------------------------------- */

.diagram {
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin: 0 0 14px;
}

/* -- closing ------------------------------------------------------------- */

.closing { border-top: 1px solid var(--line); padding-top: 34px; }
.links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }

footer {
  border-top: 1px solid var(--line);
  padding: 22px 20px 40px;
  font-size: 0.84rem;
  color: var(--muted);
}

footer p { margin: 0; }

@media (max-width: 560px) {
  .top h1 { font-size: 1.9rem; }
  .console { padding: 15px; border-radius: 10px; }
}