/* ============================================================
   ATLAS — a personal almanac. Shared design system.
   Cool cinematic / cartographic. Teal + blue accents.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  /* surfaces — cool navy, subtly toned (low chroma) */
  --bg-0: oklch(0.17 0.018 250);   /* page */
  --bg-1: oklch(0.21 0.020 250);   /* panel */
  --bg-2: oklch(0.25 0.022 250);   /* raised */
  --bg-3: oklch(0.30 0.024 250);   /* hover */

  /* ink */
  --ink-0: oklch(0.96 0.008 250);  /* primary text */
  --ink-1: oklch(0.80 0.015 250);  /* secondary */
  --ink-2: oklch(0.64 0.018 250);  /* muted */
  --ink-3: oklch(0.50 0.018 250);  /* faint / labels */

  /* lines */
  --line-0: oklch(0.32 0.02 250 / 0.7);
  --line-1: oklch(0.40 0.03 250 / 0.5);

  /* accent — switchable hue, constant L & C */
  --acc-h: 195;
  --acc:    oklch(0.80 0.13 var(--acc-h));
  --acc-dim: oklch(0.80 0.13 var(--acc-h) / 0.16);
  --acc-line: oklch(0.80 0.13 var(--acc-h) / 0.40);
  --acc-ink: oklch(0.30 0.05 var(--acc-h));

  --shadow: 0 1px 2px oklch(0 0 0 / 0.4), 0 8px 30px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 2px 6px oklch(0 0 0 / 0.45), 0 24px 70px oklch(0 0 0 / 0.5);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 26px;

  --maxw: 1280px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-accent="blue"]   { --acc-h: 252; }
[data-accent="violet"] { --acc-h: 300; }
[data-accent="teal"]   { --acc-h: 195; }

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

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg-0);
  color: var(--ink-0);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
}

/* subtle cool atmosphere behind everything */
body::before {
  content: "";
  position: fixed; inset: 0;
  z-index: -2;
  background:
    radial-gradient(120% 90% at 80% -10%, oklch(0.80 0.13 var(--acc-h) / 0.10), transparent 55%),
    radial-gradient(90% 70% at 0% 100%, oklch(0.55 0.10 270 / 0.12), transparent 60%);
  pointer-events: none;
}

h1, h2, h3, h4, .display {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--acc); color: var(--acc-ink); }

/* scrollbars */
*::-webkit-scrollbar { height: 10px; width: 10px; }
*::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 99px; border: 2px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background: var(--line-1); }

/* ---------- shared label / kicker ---------- */
.kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--acc);
}

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- NAV ---------- */
.atlas-nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center; gap: 28px;
  padding: 0 24px;
  background: oklch(0.17 0.018 250 / 0.72);
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  border-bottom: 1px solid var(--line-0);
}
.atlas-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; letter-spacing: 0.16em;
  font-size: 15px;
}
.atlas-brand .glyph {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1.5px solid var(--acc);
  position: relative; flex: none;
  box-shadow: 0 0 16px var(--acc-dim);
}
.atlas-brand .glyph::before,
.atlas-brand .glyph::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  border: 1px solid var(--acc-line);
}
.atlas-brand .glyph::before { transform: scaleX(0.42); }
.atlas-brand .glyph::after  { transform: scaleY(0.5); }
.atlas-brand small {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 400; font-size: 9.5px; letter-spacing: 0.18em;
  color: var(--ink-3); text-transform: uppercase;
}

.atlas-links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.atlas-links a {
  position: relative;
  padding: 8px 14px; border-radius: 99px;
  font-size: 13.5px; color: var(--ink-2);
  transition: color 0.2s, background 0.2s;
}
.atlas-links a:hover { color: var(--ink-0); background: var(--bg-1); }
.atlas-links a.active { color: var(--ink-0); }
.atlas-links a.active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 1px; height: 2px;
  background: var(--acc); border-radius: 2px; box-shadow: 0 0 10px var(--acc);
}

.atlas-spacer { flex: 1; }

.accent-switch { display: flex; align-items: center; gap: 7px; }
.accent-switch button {
  width: 16px; height: 16px; border-radius: 50%;
  border: 1.5px solid var(--line-1); cursor: pointer; padding: 0;
  background: var(--sw); transition: transform 0.15s, border-color 0.15s;
}
.accent-switch button:hover { transform: scale(1.15); }
.accent-switch button[aria-pressed="true"] { border-color: var(--ink-0); transform: scale(1.15); }

.nav-toggle { display: none; background: none; border: 0; color: var(--ink-0); cursor: pointer; padding: 8px; }

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.page-head { padding: 54px 0 30px; }
.page-head h1 { font-size: clamp(34px, 5vw, 56px); }
.page-head p { color: var(--ink-2); max-width: 56ch; margin-top: 14px; font-size: 16.5px; }

/* ---------- buttons / pills ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px; letter-spacing: 0.04em;
  padding: 4px 9px; border-radius: 99px;
  background: var(--bg-2); color: var(--ink-1);
  border: 1px solid var(--line-0); white-space: nowrap;
}
.tag.acc { background: var(--acc-dim); color: var(--acc); border-color: var(--acc-line); }

.chip {
  font-family: 'IBM Plex Mono', monospace; font-size: 12px;
  padding: 7px 14px; border-radius: 99px; cursor: pointer;
  background: var(--bg-1); color: var(--ink-2);
  border: 1px solid var(--line-0); transition: all 0.18s var(--ease);
  letter-spacing: 0.03em;
}
.chip:hover { color: var(--ink-0); border-color: var(--line-1); }
.chip.on { background: var(--acc-dim); color: var(--acc); border-color: var(--acc-line); }

.card {
  background: var(--bg-1);
  border: 1px solid var(--line-0);
  border-radius: var(--r-lg);
  transition: border-color 0.2s, transform 0.25s var(--ease), box-shadow 0.25s;
}
.card:hover { border-color: var(--acc-line); }

/* ---------- striped image placeholder ---------- */
.ph {
  position: relative; overflow: hidden;
  background:
    repeating-linear-gradient(135deg,
      oklch(0.30 0.03 var(--ph-h, 250) / 0.55) 0 2px,
      transparent 2px 11px),
    linear-gradient(160deg, oklch(0.33 0.04 var(--ph-h, 250)), oklch(0.22 0.03 calc(var(--ph-h, 250) + 30)));
  display: flex; align-items: flex-end;
}
.ph .ph-label {
  font-family: 'IBM Plex Mono', monospace; font-size: 10.5px;
  letter-spacing: 0.06em; color: oklch(0.92 0.01 250 / 0.8);
  padding: 8px 10px; text-transform: lowercase;
}

/* ---------- footer ---------- */
.atlas-foot {
  margin-top: 80px; border-top: 1px solid var(--line-0);
  padding: 36px 24px 60px;
}
.atlas-foot .wrap { display: flex; flex-wrap: wrap; gap: 18px; align-items: baseline; justify-content: space-between; }
.atlas-foot .mono { color: var(--ink-3); font-size: 12px; letter-spacing: 0.05em; }
.atlas-foot .foot-links { display: flex; gap: 18px; }
.atlas-foot .foot-links a { color: var(--ink-2); font-size: 13px; }
.atlas-foot .foot-links a:hover { color: var(--acc); }

/* ---------- utility ---------- */
.row { display: flex; align-items: center; }
.col { display: flex; flex-direction: column; }
.gap-6 { gap: 6px; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; }
.muted { color: var(--ink-2); }
.faint { color: var(--ink-3); }
.hide { display: none !important; }

@media (max-width: 760px) {
  .atlas-links { display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0; padding: 8px;
    background: var(--bg-1); border-bottom: 1px solid var(--line-0); }
  .atlas-links.open { display: flex; }
  .atlas-links a { padding: 12px 14px; border-radius: var(--r-sm); }
  .atlas-links a.active::after { display: none; }
  .nav-toggle { display: block; }
}

@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.fade-up { animation: fadeUp 0.6s var(--ease) both; }