/* DataSemver project site.
   Both modes from one token set: the captures are dark screens, but a page that only
   exists in the dark is a page half the readers meet on the wrong footing.
   Radius scale, locked: containers and buttons 10px, chips 4px, nothing else.
   Accent, locked: one teal across both modes, used for links and the primary action only.
   Severity red / amber / blue are semantic, never decorative, and match what the CLI prints. */

:root {
  color-scheme: light dark;

  --ground: #fbfbfc;
  --raise: #ffffff;
  --sunk: #f3f5f8;
  --line: #e2e6ec;
  --line-firm: #cbd2dc;
  --ink: #14181f;
  --ink-soft: #414a58;
  --muted: #5c6675;
  --accent: #0e7c5a;
  --accent-ink: #ffffff;

  --major: #ab2a20;  --major-tint: #fbeceb;
  --minor: #83540a;  --minor-tint: #faf1de;
  --patch: #2a5a7d;  --patch-tint: #e8f0f7;

  --sans: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --read: 64ch;
  --page: 70rem;
  --r: 10px;
  --r-chip: 4px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0b0e14;
    --raise: #141922;
    --sunk: #10151d;
    --line: #232c39;
    --line-firm: #36404f;
    --ink: #e8ecf2;
    --ink-soft: #b6c0ce;
    --muted: #8892a4;
    --accent: #4ecda4;
    --accent-ink: #062018;

    --major: #ff7a6b;  --major-tint: #2c1714;
    --minor: #e3b25c;  --minor-tint: #2a2214;
    --patch: #7bb8e0;  --patch-tint: #152633;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.page { max-width: var(--page); margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2.5rem); }

a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--r-chip); }
code { font-family: var(--mono); font-size: 0.92em; }
h1, h2, h3 { text-wrap: balance; }

/* ---------- navigation: one line, 64px ---------- */
.nav {
  display: flex; align-items: center; gap: 1.5rem;
  height: 64px; border-bottom: 1px solid var(--line);
}
.mark {
  font-weight: 700; font-size: 1rem; letter-spacing: -0.01em;
  font-variation-settings: "wdth" 112; color: var(--ink); text-decoration: none;
  display: flex; align-items: center; gap: 0.5rem;
}
/* The seam takes the accent token rather than naming a colour, so the one mark follows both
   modes the way everything else on the page does. */
.mark-glyph { width: 22px; height: 22px; flex: none; }
.mark b { color: var(--accent); font-weight: 700; }
.nav ul {
  list-style: none; margin: 0 0 0 auto; padding: 0;
  display: flex; align-items: center; gap: 1.35rem;
}
.nav a:not(.mark) {
  color: var(--muted); text-decoration: none; font-size: 0.88rem;
  transition: color 0.18s ease;
}
.nav a:not(.mark):hover { color: var(--ink); }
.nav .swap {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.07em;
  border: 1px solid var(--line-firm); border-radius: var(--r-chip); padding: 0.18rem 0.5rem;
}
.nav .swap:hover { border-color: var(--accent); color: var(--accent); }
@media (max-width: 720px) { .nav .hide-sm { display: none; } }

/* ---------- hero: asymmetric split, real capture on the right ---------- */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(1.8rem, 5vw, 4rem); align-items: center;
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2.2rem, 5vw, 3.5rem);
}
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; } }

h1 {
  margin: 0;
  font-size: clamp(1.85rem, 3.4vw, 2.5rem);
  line-height: 1.1; letter-spacing: -0.03em; font-weight: 800;
  font-variation-settings: "wdth" 116;
}
h1 i { font-style: normal; color: var(--muted); font-variation-settings: "wdth" 94; }
.hero p {
  margin: 1.2rem 0 0; max-width: 42ch; font-size: 1.08rem; color: var(--ink-soft);
}

.start { display: flex; gap: 0.65rem; flex-wrap: wrap; align-items: center; margin-top: 1.9rem; }
.snippet {
  display: flex; align-items: center; gap: 0.85rem;
  background: var(--raise); border: 1px solid var(--line-firm); border-radius: var(--r);
  padding: 0.55rem 0.55rem 0.55rem 0.95rem; font-family: var(--mono); font-size: 0.88rem;
}
.snippet i { color: var(--accent); font-style: normal; }
.snippet button {
  font: inherit; font-size: 0.7rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted); background: transparent; border: 1px solid var(--line-firm);
  border-radius: var(--r-chip); padding: 0.24rem 0.55rem; cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.snippet button:hover { color: var(--ink); border-color: var(--accent); }
.link-out {
  font-size: 0.9rem; font-weight: 600; text-decoration: none; color: var(--ink);
  border: 1px solid var(--line-firm); border-radius: var(--r); padding: 0.62rem 1rem;
  transition: border-color 0.18s ease, color 0.18s ease;
}
.link-out:hover { border-color: var(--accent); color: var(--accent); }
.shot-hero img {
  display: block; width: 100%; height: auto; border-radius: var(--r);
  border: 1px solid var(--line);
}

/* ---------- fact strip ---------- */
.facts {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.facts div { padding: 1rem 1rem 1rem 0; }
.facts dt {
  font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted);
}
.facts dd {
  margin: 0.22rem 0 0; font-family: var(--mono); font-size: 1.02rem; font-weight: 600;
  font-variant-numeric: tabular-nums; overflow-wrap: anywhere;
}

/* ---------- sections ---------- */
section { padding: clamp(3rem, 6.5vw, 4.5rem) 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
h2 {
  margin: 0; font-size: clamp(1.45rem, 3vw, 1.95rem); font-weight: 700;
  letter-spacing: -0.025em; font-variation-settings: "wdth" 108;
}
.say { color: var(--muted); margin: 0.7rem 0 0; max-width: var(--read); }

/* the reason: one column, no ornament */
.reason p { margin: 1rem 0 0; max-width: var(--read); font-size: 1.05rem; color: var(--ink-soft); }

/* severity ladder: ordered, because the order is the rule */
.ladder { margin-top: 2.1rem; border-top: 1px solid var(--line); }
.rung {
  display: grid; grid-template-columns: 6.5rem minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(0.9rem, 2.5vw, 2rem); align-items: start;
  padding: 1.15rem 0; border-bottom: 1px solid var(--line);
}
@media (max-width: 800px) { .rung { grid-template-columns: 1fr; gap: 0.55rem; } }
.tag {
  font-family: var(--mono); font-size: 0.68rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 0.2rem 0.5rem; border-radius: var(--r-chip);
  justify-self: start;
}
.tag.major { color: var(--major); background: var(--major-tint); }
.tag.minor { color: var(--minor); background: var(--minor-tint); }
.tag.patch { color: var(--patch); background: var(--patch-tint); }
.rung h3 { margin: 0; font-size: 1rem; font-weight: 600; letter-spacing: -0.01em; }
.rung p { margin: 0.3rem 0 0; font-size: 0.9rem; color: var(--muted); }
.rules { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.35rem; }
.rules li {
  font-family: var(--mono); font-size: 0.72rem; color: var(--muted);
  border: 1px solid var(--line); border-radius: var(--r-chip); padding: 0.15rem 0.42rem;
}
.after-ladder { margin-top: 1.5rem; font-size: 0.92rem; color: var(--muted); max-width: var(--read); }

/* a split with a real capture */
.pair {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(1.5rem, 4vw, 3rem); align-items: center; margin-top: 2rem;
}
@media (max-width: 860px) { .pair { grid-template-columns: 1fr; } }
.pair img, .full img {
  display: block; width: 100%; height: auto; border-radius: var(--r);
  border: 1px solid var(--line);
}
.pair p { margin: 0.9rem 0 0; color: var(--ink-soft); font-size: 0.96rem; }

/* full-bleed capture */
.full { margin-top: 2rem; }
.full p { margin: 1rem auto 0; color: var(--muted); font-size: 0.92rem; max-width: var(--read); }

/* four surfaces, ruled not carded */
.surfaces {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(1.5rem, 4vw, 3rem); margin-top: 2rem;
}
@media (max-width: 700px) { .surfaces { grid-template-columns: 1fr; } }
.surfaces > div { padding: 1.3rem 0; border-top: 1px solid var(--line); }
/* An odd last item would hang in one column with empty space beside it. */
.surfaces > div:nth-child(odd):last-child { grid-column: 1 / -1; }
.surfaces h3 { margin: 0 0 0.35rem; font-size: 0.98rem; font-weight: 600; }
.surfaces p { margin: 0 0 0.55rem; font-size: 0.9rem; color: var(--ink-soft); }
.surfaces code { color: var(--muted); font-size: 0.8rem; overflow-wrap: anywhere; }

pre {
  margin: 2rem 0 0; background: var(--sunk); border: 1px solid var(--line);
  border-radius: var(--r); padding: 1rem 1.15rem; overflow-x: auto;
  font-family: var(--mono); font-size: 0.83rem; line-height: 1.75; color: var(--ink-soft);
}
pre b { color: var(--muted); font-weight: 400; }
pre i { color: var(--accent); font-style: normal; }

/* closing action */
.closer { display: flex; gap: 0.65rem; flex-wrap: wrap; align-items: center; margin-top: 1.8rem; }
.go {
  font-size: 0.92rem; font-weight: 600; text-decoration: none;
  background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent);
  border-radius: var(--r); padding: 0.65rem 1.1rem;
  transition: filter 0.18s ease;
}
.go:hover { filter: brightness(1.07); }
.go:active { transform: translateY(1px); }

footer { padding: 2.4rem 0 3.2rem; color: var(--muted); font-size: 0.85rem; }
footer ul { list-style: none; margin: 0 0 1.2rem; padding: 0; display: flex; flex-wrap: wrap; gap: 1.05rem; }
footer a { color: var(--ink-soft); text-decoration: none; }
footer a:hover { color: var(--accent); }
footer p { margin: 0; max-width: var(--read); }