/* Adaptive Typing Trainer — theme-aware styling. */

:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #eceef1;
  --text: #1d2129;
  --muted: #6b7280;
  --border: #d7dbe0;
  --accent: #3b82f6;
  --accent-contrast: #ffffff;
  --pace: #f59e0b;
  --done: #9aa3af;
  --error: #ef4444;
  --good: #16a34a;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 6px 24px rgba(0,0,0,.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a; --surface: #1e2127; --surface-2: #262a31; --text: #e7eaee;
    --muted: #9aa3af; --border: #333842; --accent: #4f9dff; --accent-contrast: #0b0d10;
    --done: #5b616b; --shadow: 0 1px 3px rgba(0,0,0,.4), 0 8px 30px rgba(0,0,0,.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14161a; --surface: #1e2127; --surface-2: #262a31; --text: #e7eaee;
  --muted: #9aa3af; --border: #333842; --accent: #4f9dff; --accent-contrast: #0b0d10;
  --done: #5b616b; --shadow: 0 1px 3px rgba(0,0,0,.4), 0 8px 30px rgba(0,0,0,.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.4;
}

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  flex-wrap: wrap; padding: .8rem 1.2rem; background: var(--surface);
  border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
}
.topbar h1 { font-size: 1.15rem; margin: 0; }
.controls { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; }
.ctl { font-size: .82rem; color: var(--muted); display: inline-flex; align-items: center; gap: .35rem; }
.ctl.toggle { cursor: pointer; }
select {
  font: inherit; font-size: .85rem; padding: .3rem .4rem; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
}
button { font: inherit; cursor: pointer; border-radius: 10px; border: 1px solid transparent; }
button.primary { background: var(--accent); color: var(--accent-contrast); padding: .55rem 1.1rem; font-weight: 600; }
button.primary.running { background: var(--error); }
button.ghost { background: var(--surface-2); color: var(--text); border-color: var(--border); padding: .45rem .8rem; }

main { max-width: 960px; margin: 0 auto; padding: 1.2rem; }

/* ---- stage + HUD ---- */
.stage-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: .8rem; }
.stage { color: var(--muted); font-size: .9rem; }
.hud { display: flex; gap: 1.4rem; }
.hud-item { text-align: center; }
.hud-item label { display: block; font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.hud-item b { font-size: 1.3rem; font-variant-numeric: tabular-nums; }

/* ---- prompt ---- */
.prompt {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.4rem 1.6rem; min-height: 3.4rem; box-shadow: var(--shadow);
  font-size: 1.9rem; letter-spacing: .04em; font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  display: flex; flex-wrap: wrap; align-items: center; gap: .1rem .15rem; line-height: 2.1;
}
.tok { padding: 0 .05em; border-radius: 6px; transition: color .1s, background .1s; }
.tok-pending { color: var(--muted); }
.tok-done { color: var(--done); }
.tok-current { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--text); box-shadow: inset 0 -3px 0 var(--accent); }
.tok-error { background: color-mix(in srgb, var(--error) 30%, transparent); color: var(--text); }
.tok-space.tok-pending { color: color-mix(in srgb, var(--muted) 45%, transparent); }
/* push-mode pacer: an amber bar on TOP so it never collides with tok-current's bottom bar */
.tok-pacer { box-shadow: inset 0 3px 0 var(--pace); border-radius: 6px 6px 0 0; }
.tok-pacer.tok-current { box-shadow: inset 0 3px 0 var(--pace), inset 0 -3px 0 var(--accent); }
.prompt.pacer-caught { animation: pacer-flash .45s ease; }
@keyframes pacer-flash {
  40% { border-color: var(--pace); box-shadow: 0 0 0 3px color-mix(in srgb, var(--pace) 35%, transparent); }
}
.tok-keycap {
  font-size: .8em; font-family: inherit; border: 1px solid var(--border);
  background: var(--surface-2); padding: .05em .4em; border-radius: 6px; margin: 0 .1em;
  box-shadow: 0 1px 0 var(--border);
}
.finger-hint { text-align: center; color: var(--accent); font-weight: 600; min-height: 1.4em; margin: .5rem 0 1rem; }

/* ---- Mac shortcuts mode ---- */
.shortcut-card { text-align: center; padding: .4rem 0 .2rem; }
.sc-q { font-size: 1.5rem; font-weight: 700; margin: .2rem 0 .1rem; }
.sc-sub { color: var(--muted); font-size: .85rem; margin: .1rem 0 .8rem; }
.sc-hint-keys { color: var(--accent); font-weight: 600; }
.sc-keycaps { display: flex; gap: .4rem; justify-content: center; margin: .5rem 0 .8rem; }
.sc-keycaps.hidden { visibility: hidden; }
.sc-keycaps .keycap {
  min-width: 2rem; padding: .35rem .5rem; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface-2); font-size: 1.2rem; font-weight: 700; box-shadow: 0 2px 0 var(--border);
}
.sc-options { list-style: none; margin: .4rem auto 0; padding: 0; max-width: 30rem; display: grid; gap: .5rem; }
.sc-option {
  display: flex; align-items: center; gap: .6rem; padding: .55rem .8rem; text-align: left;
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface); cursor: pointer;
  font-size: 1rem; transition: background .1s;
}
.sc-option:hover { background: var(--surface-2); }
.sc-num { display: inline-flex; width: 1.5rem; height: 1.5rem; align-items: center; justify-content: center;
  border-radius: 6px; background: var(--surface-2); font-weight: 700; font-size: .85rem; }
.sc-option.sc-correct { border-color: var(--good); background: color-mix(in srgb, var(--good) 15%, var(--surface)); }
.sc-option.sc-chosen-wrong { border-color: var(--error); background: color-mix(in srgb, var(--error) 15%, var(--surface)); }
.shortcut-card.sc-right .sc-q, .shortcut-card.sc-right .sc-keycaps .keycap { color: var(--good); }
.shortcut-card.sc-wrong .sc-keycaps .keycap { border-color: var(--error); }
.sc-note { color: var(--muted); font-size: .75rem; font-style: italic; margin: .8rem 0 0; }
/* Finger guidance is scaffolding — hide the text hint when toggled off; key tints stay. */
body.no-fingers .finger-hint { visibility: hidden; }

/* ---- transient notice banner ---- */
.notice {
  width: max-content; max-width: 100%; margin: .1rem auto .5rem; min-height: 2.1rem;
  padding: .4rem .95rem; border-radius: 999px; text-align: center;
  font-size: .88rem; font-weight: 600; color: var(--text);
  background: color-mix(in srgb, var(--accent) 15%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  opacity: 0; transform: translateY(-4px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.notice.show { opacity: 1; transform: translateY(0); }

/* ---- keyboard ---- */
.keyboard { display: flex; flex-direction: column; gap: 6px; user-select: none; }
.kb-row { display: flex; gap: 6px; }
.kb-key {
  flex: 1 1 0; min-width: 0; position: relative; border: 1px solid var(--border);
  border-radius: 8px; height: 46px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; font-size: .95rem;
  background: var(--surface); box-shadow: 0 1px 0 var(--border);
}
.kb-special { font-size: .68rem; color: var(--muted); text-transform: lowercase; }
.kb-main { line-height: 1; }
.kb-sub { position: absolute; top: 3px; left: 6px; font-size: .6rem; color: var(--muted); }
.kb-key.kb-next {
  outline: 3px solid var(--finger, var(--accent)); outline-offset: -1px;
  background: var(--finger, var(--accent)); color: #10141a; font-weight: 700; z-index: 2;
  filter: saturate(1.2);
}
.kb-key.kb-next-shift { outline: 3px dashed var(--accent); outline-offset: -1px; font-weight: 700; }
.kb-key.kb-error { background: var(--error) !important; color: #fff; }
/* Per-key mastery: a fill that rises from the bottom in the key's finger colour. */
.kb-key .kb-mastery {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 0;
  height: calc(var(--mastery, 0) * 100%);
  background: var(--finger, var(--accent)); opacity: .28;
  border-radius: 0 0 7px 7px; pointer-events: none; transition: height .4s ease;
}
.kb-key .kb-main, .kb-key .kb-sub { position: relative; z-index: 1; }
/* Ring the key currently being introduced (box-shadow so it composes with kb-next's outline). */
.kb-key.kb-target { box-shadow: inset 0 0 0 2px var(--accent), 0 1px 0 var(--border); }

.legend { display: flex; flex-wrap: wrap; gap: .6rem 1rem; margin: .8rem 0 1.4rem; justify-content: center; font-size: .78rem; color: var(--muted); }
.legend-item { display: inline-flex; align-items: center; gap: .35rem; }
.swatch { width: 14px; height: 14px; border-radius: 4px; display: inline-block; border: 1px solid rgba(0,0,0,.15); }

/* ---- panel ---- */
.panel { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; }
.panel-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1rem; box-shadow: var(--shadow); }
.panel-card h2 { font-size: .82rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 0 0 .7rem; }
.streak { font-size: 1.3rem; font-weight: 700; margin: .2rem 0; }
.goal { color: var(--muted); font-size: .85rem; }
.chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.chip { background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; padding: .15rem .5rem; font-family: "SF Mono", Menlo, monospace; font-size: .9rem; }
.bars { display: flex; align-items: flex-end; gap: 3px; height: 70px; }
.bar { flex: 1 1 0; background: var(--accent); border-radius: 3px 3px 0 0; min-height: 4px; opacity: .85; }
.hint { color: var(--muted); font-size: .75rem; margin: .5rem 0 0; }
.panel-card.danger .ghost { color: var(--error); border-color: color-mix(in srgb, var(--error) 40%, var(--border)); }

/* ---- modal ---- */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: none; align-items: center; justify-content: center; padding: 1rem; }
.modal.open { display: flex; }
.modal-card { background: var(--surface); border-radius: 16px; padding: 1.6rem; max-width: 460px; width: 100%; box-shadow: var(--shadow); text-align: center; }
.summary-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .8rem; margin: 1rem 0; }
.summary-grid .big { font-size: 1.8rem; font-weight: 700; display: block; font-variant-numeric: tabular-nums; }
.summary-grid label { font-size: .68rem; text-transform: uppercase; color: var(--muted); }
.advanced { color: var(--good); font-weight: 600; }
.weak-line { color: var(--muted); font-size: .9rem; }
.weak-line .chip { color: var(--text); }
.modal-card .primary { margin-top: .6rem; }

/* ---- richer session summary ---- */
.trend { font-size: .95rem; margin: .4rem 0; }
.trend.baseline { color: var(--muted); }
.delta { font-weight: 700; font-variant-numeric: tabular-nums; }
.delta.up { color: var(--good); }
.delta.down { color: var(--muted); }
.delta.flat { color: var(--muted); }
.pb { color: var(--good); font-weight: 700; margin-left: .3rem; }
.progress { font-size: .92rem; margin: .5rem 0 .1rem; }
.progress-count { font-size: .8rem; color: var(--muted); margin: 0 0 .4rem; font-variant-numeric: tabular-nums; }
.encourage { font-size: .9rem; color: var(--text); margin: .6rem 0 .2rem; font-style: italic; }
/* mastered keys read as positive (green-tinted chips + count) */
.chip.good { background: color-mix(in srgb, var(--good) 18%, var(--surface-2)); border-color: color-mix(in srgb, var(--good) 45%, var(--border)); color: var(--text); }
.count { font-size: .72rem; font-weight: 600; color: var(--good); font-variant-numeric: tabular-nums; }

@media (max-width: 620px) {
  .prompt { font-size: 1.4rem; }
  .kb-key { height: 38px; font-size: .8rem; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
}