/* abdullah-learn — shared design tokens and base styles.
   Mobile-first. iPhone Safari is the primary target. */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Geist:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #0a0a0c;
  --bg-raised: #111114;
  --bg-card: #14141a;
  --bg-card-hover: #1a1a22;
  --border: #24242d;
  --border-strong: #32323f;

  --fg: #eceae4;
  --fg-muted: #a1a0a0;
  --fg-subtle: #6b6b73;

  --font-display: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;
  --font-body:    'Geist', -apple-system, system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', 'JetBrains Mono', ui-monospace, monospace;

  --radius: 10px;
  --radius-sm: 6px;

  --tap: 44px;
}

* { box-sizing: border-box; }

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(255,255,255,0.04), transparent 60%),
    radial-gradient(800px 400px at 90% 20%, rgba(120,80,200,0.045), transparent 60%),
    var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100dvh;

  padding-top:    env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left:   env(safe-area-inset-left);
  padding-right:  env(safe-area-inset-right);

  overflow-x: hidden;
}

a { color: var(--fg); text-decoration: none; }
a:focus-visible { outline: 2px solid var(--fg-muted); outline-offset: 2px; border-radius: 2px; }

::selection { background: #2b2b36; color: var(--fg); }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 768px) {
  .container { padding: 0 32px; }
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

hr.divider {
  border: 0;
  height: 1px;
  background: var(--border);
  margin: 32px 0;
}

.mono { font-family: var(--font-mono); }
.serif { font-family: var(--font-display); }
.italic { font-style: italic; }

/* Ensure all interactive bits clear 44px on touch. */
button,
input,
a.button {
  min-height: var(--tap);
  font-family: inherit;
}

button {
  background: transparent;
  color: inherit;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  cursor: pointer;
}

button:active { background: var(--bg-card-hover); }

/* Hide things that only make sense with a keyboard + pointer. */
@media (hover: none) {
  .kbd-hint { display: none !important; }
}