/* Levelary — Design tokens
   Copied verbatim from design/production/styles.css.
   Source of truth: docs/decisions/0005-design-tokens.md
*/

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* ----- Warm paper palette (light) ----- */
  --paper: oklch(0.975 0.012 85);
  --paper-2: oklch(0.955 0.015 82);
  --paper-3: oklch(0.93 0.018 80);
  --card: oklch(0.99 0.008 85);
  --card-sunk: oklch(0.945 0.014 82);

  --ink: oklch(0.22 0.015 60);
  --ink-2: oklch(0.36 0.015 60);
  --ink-3: oklch(0.55 0.014 60);
  --ink-4: oklch(0.72 0.012 65);

  --line: oklch(0.88 0.015 75);
  --line-2: oklch(0.92 0.012 78);

  /* Accent — moss green (mastery = growth) */
  --accent: oklch(0.52 0.08 150);
  --accent-2: oklch(0.44 0.09 150);
  --accent-soft: oklch(0.93 0.04 150);
  --accent-ring: oklch(0.52 0.08 150 / 0.25);
  --on-accent: oklch(0.98 0.01 150);

  /* Coin — warm gold (quiet) */
  --coin: oklch(0.72 0.11 80);
  --coin-ink: oklch(0.42 0.08 75);
  --coin-soft: oklch(0.95 0.04 85);

  --danger: oklch(0.55 0.14 30);

  /* Density */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  /* Radii */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 9999px;

  /* Type */
  --font-ui: 'Instrument Sans', system-ui, sans-serif;
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Shadows — soft, warm */
  --shadow-1: 0 1px 2px oklch(0.22 0.015 60 / 0.04);
  --shadow-2: 0 1px 3px oklch(0.22 0.015 60 / 0.06), 0 6px 20px oklch(0.22 0.015 60 / 0.04);
  --shadow-3: 0 2px 6px oklch(0.22 0.015 60 / 0.08), 0 16px 40px oklch(0.22 0.015 60 / 0.06);

  /* Bezier */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* Dark mode — explicit toggle OR system preference */
html[data-theme="dark"],
html[data-theme="auto"] {
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    --paper: oklch(0.18 0.012 60);
    --paper-2: oklch(0.21 0.014 60);
    --paper-3: oklch(0.25 0.016 60);
    --card: oklch(0.23 0.013 60);
    --card-sunk: oklch(0.20 0.012 60);
    --ink: oklch(0.96 0.012 80);
    --ink-2: oklch(0.82 0.012 80);
    --ink-3: oklch(0.64 0.013 70);
    --ink-4: oklch(0.48 0.013 65);
    --line: oklch(0.33 0.016 60);
    --line-2: oklch(0.28 0.014 60);
    --accent: oklch(0.72 0.10 150);
    --accent-2: oklch(0.82 0.09 150);
    --accent-soft: oklch(0.30 0.05 150);
    --accent-ring: oklch(0.72 0.10 150 / 0.30);
    --on-accent: oklch(0.18 0.03 150);
    --coin: oklch(0.80 0.12 80);
    --coin-ink: oklch(0.88 0.11 85);
    --coin-soft: oklch(0.30 0.05 80);
  }
}

html[data-theme="dark"] {
  --paper: oklch(0.18 0.012 60);
  --paper-2: oklch(0.21 0.014 60);
  --paper-3: oklch(0.25 0.016 60);
  --card: oklch(0.23 0.013 60);
  --card-sunk: oklch(0.20 0.012 60);
  --ink: oklch(0.96 0.012 80);
  --ink-2: oklch(0.82 0.012 80);
  --ink-3: oklch(0.64 0.013 70);
  --ink-4: oklch(0.48 0.013 65);
  --line: oklch(0.33 0.016 60);
  --line-2: oklch(0.28 0.014 60);
  --accent: oklch(0.72 0.10 150);
  --accent-2: oklch(0.82 0.09 150);
  --accent-soft: oklch(0.30 0.05 150);
  --accent-ring: oklch(0.72 0.10 150 / 0.30);
  --on-accent: oklch(0.18 0.03 150);
  --coin: oklch(0.80 0.12 80);
  --coin-ink: oklch(0.88 0.11 85);
  --coin-soft: oklch(0.30 0.05 80);
}

/* ─── Base ─── */
* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  font-family: var(--font-ui);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
  line-height: 1.5;
}

body { background: var(--paper); min-height: 100vh; }

/* Type helpers */
.t-display { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.015em; line-height: 1.1; }
.t-serif-it { font-family: var(--font-display); font-style: italic; }
.t-mono { font-family: var(--font-mono); font-feature-settings: "tnum", "ss01"; }
.t-ui { font-family: var(--font-ui); }

.t-eyebrow {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3);
}

/* ─── Surfaces ─── */
.surface { background: var(--card); border-radius: var(--radius-lg); }
.surface-sunk { background: var(--card-sunk); border-radius: var(--radius-lg); }
.hairline { border: 1px solid var(--line); }

/* ─── Buttons ─── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s var(--ease), background 0.15s, border-color 0.15s;
  background: transparent;
  color: var(--ink);
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: scale(0.98); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-2); }
.btn-secondary { background: var(--card); border-color: var(--line); color: var(--ink); }
.btn-ghost { color: var(--ink-2); }
.btn-ghost:hover { background: var(--card-sunk); }
.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: var(--ink-2); }
.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-lg { padding: 16px 28px; font-size: 16px; }

/* ─── Pills / chips ─── */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--card-sunk);
  color: var(--ink-2);
  font-size: 12px; font-weight: 500;
  border: 1px solid transparent;
}
.chip-accent { background: var(--accent-soft); color: var(--accent-2); }
.chip-coin { background: var(--coin-soft); color: var(--coin-ink); }

/* ─── Coin pill ─── */
.coin-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px 3px 4px;
  border-radius: var(--radius-pill);
  background: var(--coin-soft);
  color: var(--coin-ink);
  font-family: var(--font-mono); font-weight: 500;
  font-size: 12px;
  border: 1px solid oklch(from var(--coin) l c h / 0.25);
}
.coin-dot {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--coin);
  display: inline-block; flex-shrink: 0;
  box-shadow: inset 0 -1px 0 oklch(from var(--coin) calc(l - 0.1) c h / 0.4);
}

/* ─── Progress bar ─── */
.xp-bar {
  height: 6px;
  background: var(--card-sunk);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}
.xp-bar > i {
  position: absolute; inset: 0 auto 0 0;
  background: var(--accent);
  border-radius: var(--radius-pill);
}
.xp-bar.thick { height: 10px; }

/* ─── Reduced motion ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}