/* ============================================================
   PyGX — design system
   Brand: isometric cube + symbolic teal. Clean, technical, code-forward.
   ============================================================ */

/* ---- Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;450;500;600&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ---- Tokens ---- */
:root {
  /* type */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* brand rose scale (oklch) — hue 12, matching the `rose` accent preset
     in site.js. The L stops mirror the original violet ramp; chroma is
     capped at 0.20, which is where rose stays in sRGB gamut. */
  --rose-300: oklch(0.72 0.20 12);
  --rose-400: oklch(0.64 0.20 12);
  --rose-500: oklch(0.56 0.20 12);
  --rose-600: oklch(0.515 0.20 12);  /* ~ #BE0E48 brand */
  --rose-700: oklch(0.46 0.20 12);

  /* navy ink (from logo "Py") */
  --ink: oklch(0.27 0.045 275);

  /* accent — overridable by tweaks */
  --accent: var(--rose-600);
  --accent-bright: var(--rose-500);
  --accent-soft: oklch(0.56 0.20 12 / 0.12);
  --accent-line: oklch(0.56 0.20 12 / 0.30);

  /* density — overridable by tweaks */
  --density: 1;

  /* radii / shadow */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 26px;
  --shadow-sm: 0 1px 2px oklch(0.2 0.02 285 / 0.06), 0 2px 6px oklch(0.2 0.02 285 / 0.05);
  --shadow-md: 0 4px 12px oklch(0.2 0.02 285 / 0.08), 0 12px 32px oklch(0.2 0.02 285 / 0.07);
  --shadow-lg: 0 8px 24px oklch(0.2 0.02 285 / 0.10), 0 24px 64px oklch(0.2 0.02 285 / 0.10);

  /* layout */
  --maxw: 1180px;
  --nav-h: 64px;
}

/* light (default) */
:root, [data-theme="light"] {
  --bg: oklch(0.985 0.004 285);
  --bg-2: oklch(0.965 0.006 285);
  --surface: oklch(1 0 0);
  --surface-2: oklch(0.978 0.005 285);
  --text: oklch(0.22 0.02 285);
  --text-strong: oklch(0.16 0.025 285);
  --muted: oklch(0.50 0.015 285);
  --faint: oklch(0.62 0.012 285);
  --border: oklch(0.90 0.008 285);
  --border-strong: oklch(0.84 0.01 285);

  /* code theme (light) */
  --code-bg: oklch(0.205 0.018 285);
  --code-fg: oklch(0.90 0.01 285);
  --code-comment: oklch(0.60 0.02 285);
  --code-key: oklch(0.80 0.13 300);
  --code-str: oklch(0.83 0.12 150);
  --code-num: oklch(0.85 0.10 70);
  --code-fn: oklch(0.82 0.11 230);
  --code-pg: oklch(0.80 0.13 285);
  --code-cls: oklch(0.86 0.10 90);
  --code-deco: oklch(0.80 0.10 30);
}

[data-theme="dark"] {
  --bg: oklch(0.16 0.012 285);
  --bg-2: oklch(0.19 0.014 285);
  --surface: oklch(0.205 0.014 285);
  --surface-2: oklch(0.235 0.016 285);
  --text: oklch(0.90 0.012 285);
  --text-strong: oklch(0.97 0.01 285);
  --muted: oklch(0.68 0.015 285);
  --faint: oklch(0.56 0.014 285);
  --border: oklch(0.30 0.014 285);
  --border-strong: oklch(0.38 0.016 285);

  --accent: var(--rose-400);
  --accent-bright: var(--rose-300);
  --accent-soft: oklch(0.64 0.20 12 / 0.18);
  --accent-line: oklch(0.64 0.20 12 / 0.36);

  --code-bg: oklch(0.135 0.012 285);
  --code-fg: oklch(0.90 0.01 285);
  --code-comment: oklch(0.55 0.02 285);
  --code-key: oklch(0.78 0.13 300);
  --code-str: oklch(0.82 0.12 150);
  --code-num: oklch(0.84 0.10 70);
  --code-fn: oklch(0.80 0.11 230);
  --code-pg: oklch(0.80 0.14 285);
  --code-cls: oklch(0.85 0.10 90);
  --code-deco: oklch(0.80 0.10 30);

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.30), 0 2px 6px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.36), 0 12px 32px oklch(0 0 0 / 0.32);
  --shadow-lg: 0 8px 24px oklch(0 0 0 / 0.40), 0 24px 64px oklch(0 0 0 / 0.42);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv05" 1, "ss01" 1;
  transition: background .3s ease, color .3s ease;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
::selection { background: var(--accent-soft); color: var(--text-strong); }

/* ---- Typography ---- */
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--text-strong); line-height: 1.08; letter-spacing: -0.02em; font-weight: 600; text-wrap: balance; }
h1 { font-size: clamp(2.6rem, 5.4vw, 4.4rem); font-weight: 700; }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.85rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.55rem); }
p { text-wrap: pretty; }
code, pre, .mono { font-family: var(--font-mono); }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---- Layout helpers ---- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 28px; }
.section { padding-block: calc(96px * var(--density)); }
.section-sm { padding-block: calc(64px * var(--density)); }
.lede { font-size: clamp(1.06rem, 1.5vw, 1.3rem); color: var(--muted); max-width: 60ch; line-height: 1.6; }
.center { text-align: center; margin-inline: auto; }
.center .lede { margin-inline: auto; }
.divider { height: 1px; background: var(--border); border: 0; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  padding: 0.72em 1.3em; border-radius: var(--r-md);
  font-weight: 500; font-size: 0.96rem; line-height: 1;
  border: 1px solid transparent; transition: all .18s ease; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow-sm); }
[data-theme="dark"] .btn-primary { color: oklch(0.16 0.012 285); }
.btn-primary:hover { background: var(--accent-bright); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost { background: var(--surface); color: var(--text-strong); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn svg { width: 1.1em; height: 1.1em; }

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: color-mix(in oklch, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner { height: 100%; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; font-family: var(--font-display); font-weight: 700; font-size: 1.34rem; letter-spacing: -0.03em; color: var(--text-strong); line-height: 1; }
.brand .wm-py { color: var(--text-strong); padding-right: 1px; }
.brand .wm-gx { color: #fff; background: var(--accent); border-radius: 7px; padding: 3px 7px 4px; margin-left: 2px; box-shadow: var(--shadow-sm); }
.brand:hover .wm-gx { background: var(--accent-bright); }
.brand-lg { font-size: 1.7rem; }
.brand-lg .wm-gx { border-radius: 9px; padding: 4px 9px 5px; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav-links a {
  padding: 7px 13px; border-radius: var(--r-sm); font-size: 0.92rem; font-weight: 450;
  color: var(--muted); transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--text-strong); background: var(--surface-2); }
.nav-links a.active { color: var(--accent); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r-sm); background: transparent; border: 1px solid transparent; color: var(--muted);
  transition: all .15s;
}
.icon-btn:hover { color: var(--text-strong); background: var(--surface-2); border-color: var(--border); }
.icon-btn svg { width: 19px; height: 19px; }
.nav-toggle { display: none; }

/* ---- Code blocks ---- */
.code {
  background: var(--code-bg); color: var(--code-fg);
  border-radius: var(--r-md); font-family: var(--font-mono); font-size: 0.86rem; line-height: 1.7;
  overflow: hidden; box-shadow: var(--shadow-md); border: 1px solid oklch(1 0 0 / 0.06);
}
.code-bar {
  display: flex; align-items: center; gap: 8px; padding: 11px 15px;
  border-bottom: 1px solid oklch(1 0 0 / 0.07); background: oklch(1 0 0 / 0.02);
}
.code-dots { display: flex; gap: 6px; }
.code-dots i { width: 11px; height: 11px; border-radius: 50%; background: oklch(1 0 0 / 0.16); }
.code-title { font-size: 0.76rem; color: oklch(0.7 0.02 285); margin-left: 4px; }
.code-copy {
  margin-left: auto; background: transparent; border: 1px solid oklch(1 0 0 / 0.12); color: oklch(0.72 0.02 285);
  border-radius: 6px; padding: 4px 9px; font-family: var(--font-mono); font-size: 0.7rem; transition: all .15s;
}
.code-copy:hover { color: var(--code-fg); border-color: oklch(1 0 0 / 0.3); }
.code pre { margin: 0; padding: 18px 20px; overflow-x: auto; }
.code pre.tight { padding: 16px 18px; }
.code-fg { color: var(--code-fg); }

/* syntax tokens */
.tok-c { color: var(--code-comment); font-style: italic; }
.tok-k { color: var(--code-key); }
.tok-s { color: var(--code-str); }
.tok-n { color: var(--code-num); }
.tok-f { color: var(--code-fn); }
.tok-pg { color: var(--code-pg); }
.tok-cls { color: var(--code-cls); }
.tok-d { color: var(--code-deco); }

/* inline code */
.ic { font-family: var(--font-mono); font-size: 0.88em; background: var(--surface-2); border: 1px solid var(--border); color: var(--accent); padding: 0.08em 0.4em; border-radius: 6px; }

/* ---- Install command ---- */
.install {
  display: inline-flex; align-items: center; gap: 14px;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--r-md);
  padding: 12px 12px 12px 18px; font-family: var(--font-mono); font-size: 0.96rem; box-shadow: var(--shadow-sm);
}
.install .prompt { color: var(--accent); }
.install .cmd { color: var(--text-strong); }
.install button {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; color: var(--muted);
  width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; transition: all .15s;
}
.install button:hover { color: var(--accent); border-color: var(--accent); }
.install button svg { width: 16px; height: 16px; }

/* ---- Cards / grid ---- */
.grid { display: grid; gap: 18px; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 26px; transition: border-color .2s, transform .2s, box-shadow .2s;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.card .ico {
  width: 40px; height: 40px; border-radius: var(--r-sm); display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 16px;
}
.card .ico svg { width: 21px; height: 21px; }
.card h3 { font-size: 1.12rem; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 0.94rem; }
.card code, .card .ic { font-size: 0.84em; }

/* tag / chip */
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 999px;
  font-family: var(--font-mono); font-size: 0.76rem; font-weight: 500; white-space: nowrap;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--muted);
}
.chip.accent { background: var(--accent-soft); border-color: var(--accent-line); color: var(--accent); }

/* badge dot */
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-bright); display: inline-block; }

/* ---- Footer ---- */
.footer { border-top: 1px solid var(--border); background: var(--bg-2); padding-block: 56px 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; }
.footer h4 { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); margin-bottom: 16px; font-weight: 500; }
.footer a { display: block; color: var(--muted); font-size: 0.92rem; padding: 5px 0; transition: color .15s; }
.footer a:hover { color: var(--accent); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 44px; padding-top: 26px; border-top: 1px solid var(--border); color: var(--faint); font-size: 0.86rem; }

/* ---- reveal on scroll ---- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* ---- Tweaks panel ---- */
.tw-panel {
  position: fixed; right: 18px; bottom: 18px; z-index: 200; width: 270px;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; font-size: 0.9rem;
}
.tw-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); font-family: var(--font-display); font-weight: 600; color: var(--text-strong); }
.tw-x { background: none; border: 0; color: var(--faint); font-size: 0.9rem; }
.tw-x:hover { color: var(--text-strong); }
.tw-body { padding: 16px; display: flex; flex-direction: column; gap: 18px; }
.tw-row { display: flex; flex-direction: column; gap: 9px; }
.tw-row label { font-size: 0.78rem; font-weight: 500; color: var(--muted); display: flex; justify-content: space-between; }
.tw-dval { color: var(--accent); font-family: var(--font-mono); }
.tw-swatches { display: flex; gap: 9px; }
.tw-sw { width: 30px; height: 30px; border-radius: 8px; border: 2px solid var(--border); transition: transform .12s; }
.tw-sw:hover { transform: scale(1.08); }
.tw-sw.on { border-color: var(--text-strong); box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); }
.tw-font { width: 100%; padding: 8px 10px; border-radius: var(--r-sm); border: 1px solid var(--border-strong); background: var(--surface-2); color: var(--text); font: inherit; }
.tw-density { width: 100%; accent-color: var(--accent); }

/* ---- misc ---- */
.kbd { font-family: var(--font-mono); font-size: 0.8em; background: var(--surface-2); border: 1px solid var(--border-strong); border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; color: var(--muted); }
.hide { display: none !important; }

/* ---- responsive ---- */
@media (max-width: 920px) {
  .cols-4 { grid-template-columns: repeat(2, 1fr); }
  .cols-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; }
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .wrap { padding-inline: 20px; }
  .section { padding-block: calc(64px * var(--density)); }
}