/* ──────────────────────────────────────────────────────────────
   Shared styles: tokens, base, nav, buttons, sections, footer.
   Used by index.html and every page under posts/.
   ────────────────────────────────────────────────────────────── */

/* Palette: six named colors (Paper, Ink, Graphite, Signal, Copper, Fault), light default +
   dark via system setting or the toggle. Legacy names (--bg, --accent, --ok…) are aliases. */
:root {
  --paper: #F7F5F0;  --paper-2: #EFECE4;  --rule: #D9D4C7;  --rule-strong: #BDB6A6;
  --ink: #15171C;    --ink-2: #353A44;    --graphite: #555C6A;
  --signal: #1D4ED8; --copper: #B4470E;   --fault: #C2261D;
  --on-ink: #F7F5F0;
  color-scheme: light;

  --bg: var(--paper);
  --bg2: var(--paper);
  --bg3: var(--paper-2);
  --border: var(--rule);
  --border-bright: var(--rule-strong);
  --accent: var(--signal);    /* reliability, links, running */
  --accent2: var(--copper);   /* efficiency, in progress */
  --ok: var(--ink);           /* done, healthy */
  --warn: var(--copper);      /* waiting, in progress */
  --bad: var(--fault);        /* failures only */
  --text: var(--ink);
  --text-mid: var(--ink-2);
  --text-dim: var(--graphite);

  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-display: 'IBM Plex Sans', system-ui, sans-serif;
  --font-prose: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  --max: 1120px;
  --radius: 4px;
  --nav-h: 60px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #10151D;  --paper-2: #171E29;  --rule: #2A3341;  --rule-strong: #3B4656;
    --ink: #ECE8E0;    --ink-2: #CFCAC0;    --graphite: #A3ABB8;
    --signal: #86A8FF; --copper: #F0935C;   --fault: #FF7D73;
    --on-ink: #10151D;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #10151D;  --paper-2: #171E29;  --rule: #2A3341;  --rule-strong: #3B4656;
  --ink: #ECE8E0;    --ink-2: #CFCAC0;    --graphite: #A3ABB8;
  --signal: #86A8FF; --copper: #F0935C;   --fault: #FF7D73;
  --on-ink: #10151D;
  color-scheme: dark;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-prose);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
img, svg { max-width: 100%; }

.skip-link {
  position: absolute; left: -999px; top: 8px; z-index: 300;
  background: var(--ink); color: var(--on-ink);
  padding: 0.5rem 1rem; border-radius: 4px; font-weight: 700;
}
.skip-link:focus { left: 8px; }

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.mono { font-family: var(--font-mono); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ─── NAV ─── */
.nav {
  position: fixed; inset: 0 0 auto 0; height: var(--nav-h); z-index: 100;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max); height: 100%; margin: 0 auto; padding: 0 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.nav-brand {
  font-family: var(--font-mono); font-weight: 600; font-size: 1rem;
  color: var(--text); text-decoration: none; letter-spacing: -0.02em;
}
.nav-brand span { color: var(--accent); }
.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--text-dim); text-decoration: none;
  padding: 0.25rem 0; border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav-links a:hover, .nav-links a[aria-current="true"] { color: var(--text); border-bottom-color: var(--accent); }
.nav-status {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-mid);
  text-decoration: none;
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: var(--signal);
  animation: pulse 2.4s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.45; } }

.theme-toggle {
  background: none; border: 1px solid var(--border-bright); color: var(--text);
  border-radius: 4px; width: 34px; height: 30px; cursor: pointer; font-size: 0.9rem; line-height: 1;
}
.theme-toggle:hover { border-color: var(--text-dim); }
.nav-right { display: flex; align-items: center; gap: 0.75rem; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--border-bright);
  color: var(--text); border-radius: 4px; padding: 0.35rem 0.6rem;
  font-family: var(--font-mono); font-size: 0.75rem; cursor: pointer;
}

@media (max-width: 860px) {
  .theme-toggle {
  background: none; border: 1px solid var(--border-bright); color: var(--text);
  border-radius: 4px; width: 34px; height: 30px; cursor: pointer; font-size: 0.9rem; line-height: 1;
}
.theme-toggle:hover { border-color: var(--text-dim); }
.nav-right { display: flex; align-items: center; gap: 0.75rem; }

.nav-toggle { display: inline-block; }
  .nav-status { display: none; }
  .nav-links {
    display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; gap: 0; background: var(--bg2);
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 0.9rem 1.25rem; border-bottom: 1px solid var(--border); }
}

/* ─── BUTTONS / CHIPS ─── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.3rem; border-radius: 6px;
  font-family: var(--font-mono); font-size: 0.82rem; font-weight: 500;
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
}
.btn-primary { background: var(--ink); color: var(--on-ink); font-weight: 600; }
.btn-primary:hover { background: var(--ink-2); }
.btn-outline { color: var(--ink); border-color: var(--ink); background: transparent; }
.btn-outline:hover { background: var(--paper-2); }

.chip {
  display: inline-block;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em;
  padding: 0.15rem 0.6rem; border-radius: 3px;
  background: transparent; border: 1px solid var(--border-bright); color: var(--text-mid);
}
.chip-accent { color: var(--signal); border-color: color-mix(in srgb, var(--signal) 45%, transparent); }
.chip-copper { color: var(--copper); border-color: color-mix(in srgb, var(--copper) 45%, transparent); }

.status {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 0.15rem 0.55rem; border-radius: 999px; border: 1px solid;
}
.status::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.status-ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 35%, transparent); }
.status-wip { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.status-early { color: var(--text-dim); border-color: var(--border-bright); }

/* ─── SECTIONS ─── */
.section { max-width: var(--max); margin: 0 auto; padding: 5.5rem 1.25rem 1rem; }
.section-head { margin-bottom: 2.25rem; max-width: 720px; }
.section-kicker {
  font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.6rem;
}
.section-title {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.7rem, 3.4vw, 2.3rem); line-height: 1.15; letter-spacing: -0.02em;
}
.section-lede { color: var(--text-mid); margin-top: 0.75rem; font-size: 1.02rem; }

.card {
  background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius);
  transition: border-color 0.2s, background 0.2s;
}
a.card { display: block; color: inherit; text-decoration: none; }
a.card:hover { border-color: var(--ink); }

/* ─── FOOTER ─── */
.footer {
  max-width: var(--max); margin: 5rem auto 0; padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-dim);
}
.footer-links { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.footer-links a { color: var(--text-mid); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

/* ─── REVEAL ─── */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}