/* SAT Vocab — design system.
   Thesis: the word is the content, so it is set like a dictionary headword —
   a serif display face with a monospace eyebrow and a hairline rule. Indigo
   accent with an amber counterpoint. System fonts only (no external CDNs). */

:root {
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Charter, Georgia, ui-serif, serif;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

  --paper: #fafafc;
  --surface: #ffffff;
  --surface-2: #f2f2f7;
  --ink: #1b1b2a;
  --ink-soft: #55566b;
  --ink-faint: #8a8ba0;
  --line: #e5e5ee;

  --accent: #5a48e6;
  --accent-ink: #ffffff;
  --accent-soft: #ece9fd;
  --amber: #e8a33d;

  --known: #2fa36b;
  --not_familiar: #3b82c4;
  --learning: #8b7be8;
  --failing: #e5484d;
  --untested: #9aa0ae;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(27, 27, 42, .04), 0 6px 24px rgba(27, 27, 42, .06);
  --ring: 0 0 0 3px var(--accent-soft), 0 0 0 4px var(--accent);
  --wrap: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121223;
    --surface: #1c1c33;
    --surface-2: #24243f;
    --ink: #ececf5;
    --ink-soft: #adaecb;
    --ink-faint: #7b7c9c;
    --line: #2e2e4d;

    --accent: #7c6dff;
    --accent-ink: #14142a;
    --accent-soft: #2a2755;
    --amber: #f0b45e;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 30px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  font-size: 17px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--ink); }

h1, h2, h3 { font-family: var(--font-serif); line-height: 1.15; font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: clamp(1.8rem, 1.3rem + 2.4vw, 2.6rem); margin: 0 0 .3em; }
h2 { font-size: 1.3rem; margin: 0 0 .5em; }

p { margin: 0 0 1rem; }

/* ---------- Layout ---------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 5vw, 2rem);
  border-bottom: 1px solid var(--line);
}
.wordmark {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -.01em;
}
.wordmark b { color: var(--accent); }
.wordmark .mark {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-left: .5rem;
}
.site-main {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 2.75rem) clamp(1rem, 5vw, 2rem) 3rem;
  flex: 1;
}
.site-footer {
  padding: 1.5rem clamp(1rem, 5vw, 2rem);
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: .82rem;
  font-family: var(--font-mono);
  letter-spacing: .02em;
}

/* ---------- Headword signature ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 .35rem;
}
.headword {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 1.6rem + 5vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0;
  overflow-wrap: break-word;
}
.rule { height: 1px; background: var(--line); border: 0; margin: 1.1rem 0 1.6rem; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.1rem, 3vw, 1.6rem);
  box-shadow: var(--shadow);
}
.stack > * + * { margin-top: 1.1rem; }

/* ---------- Buttons ---------- */
.btn, button.plain {
  font: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .72rem 1.35rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  text-decoration: none;
  transition: transform .12s ease, filter .12s ease, box-shadow .12s ease;
}
.btn:hover { filter: brightness(1.06); transform: translateY(-1px); color: var(--accent-ink); }
.btn:active { transform: translateY(0); }
.btn--block { width: 100%; }
.btn--lg { padding: .9rem 1.6rem; font-size: 1.05rem; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem .9rem;
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font: inherit; font-weight: 500;
  text-decoration: none; cursor: pointer;
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-faint); }

/* ---------- Forms ---------- */
label { display: block; font-weight: 600; margin-bottom: .4rem; font-size: .95rem; }
input[type="text"], input[type="password"], input:not([type]) {
  font: inherit;
  width: 100%;
  padding: .7rem .85rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
input::placeholder { color: var(--ink-faint); }
input:focus-visible, .btn:focus-visible, .btn-ghost:focus-visible,
a:focus-visible, .choice:focus-within, button:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

/* Lookup field (landing) — a dictionary-style search line */
.lookup { display: flex; gap: .6rem; align-items: stretch; flex-wrap: wrap; }
.lookup input { flex: 1 1 12rem; }

/* Type-in "definition line" */
.answer-line input {
  border: 0;
  border-bottom: 2px solid var(--accent);
  border-radius: 0;
  padding: .5rem .2rem;
  font-size: 1.3rem;
  font-family: var(--font-serif);
  background: transparent;
}
.answer-line input:focus-visible { box-shadow: none; border-bottom-color: var(--amber); }

/* ---------- Choice options ---------- */
.choices { display: grid; gap: .6rem; margin: 0 0 1.4rem; }
.choice {
  display: flex; align-items: center; gap: .75rem;
  padding: .85rem 1rem;
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color .12s ease, background .12s ease;
}
.choice:hover { border-color: var(--accent); }
.choice input { position: absolute; opacity: 0; width: 0; height: 0; }
.choice .dot {
  flex: none; width: 1.1rem; height: 1.1rem; border-radius: 50%;
  border: 2px solid var(--ink-faint); transition: border-color .12s ease;
}
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.choice:has(input:checked) .dot { border-color: var(--accent); background: var(--accent); box-shadow: inset 0 0 0 3px var(--surface); }

/* ---------- Pills ---------- */
.pill {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--font-mono);
  font-size: .72rem; letter-spacing: .04em;
  padding: .28rem .6rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink-soft);
  white-space: nowrap;
}
.pill .num { font-weight: 700; color: var(--ink); }
.pill::before { content: ""; width: .55rem; height: .55rem; border-radius: 50%; background: var(--untested); }
.pill--known::before { background: var(--known); }
.pill--not_familiar::before { background: var(--not_familiar); }
.pill--learning::before { background: var(--learning); }
.pill--failing::before { background: var(--failing); }
.pill--untested::before { background: var(--untested); }
.pills { display: flex; flex-wrap: wrap; gap: .5rem; }

.tag {
  font-family: var(--font-mono); font-size: .65rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--amber);
  border: 1px solid var(--amber); border-radius: 999px; padding: .1rem .45rem;
}

/* ---------- Mastery ring ---------- */
.ring-wrap { display: flex; align-items: center; gap: 1.4rem; flex-wrap: wrap; }
.ring { width: 132px; height: 132px; flex: none; }
.ring .track { fill: none; stroke: var(--line); stroke-width: 11; }
.ring .value { fill: none; stroke: var(--accent); stroke-width: 11; stroke-linecap: round;
  transform: rotate(-90deg); transform-origin: 50% 50%;
  transition: stroke-dasharray .9s cubic-bezier(.4, 0, .2, 1); }
.ring .num { font-family: var(--font-serif); font-weight: 600; font-size: 34px; fill: var(--ink); }
.ring .cap { font-family: var(--font-mono); font-size: 9px; letter-spacing: .18em; fill: var(--ink-faint); }

/* ---------- Progress bar ---------- */
.progress { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.6rem; }
.progress .label { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; color: var(--ink-faint); text-transform: uppercase; }
.progress-bar { flex: 1; height: 6px; background: var(--line); border-radius: 999px; overflow: hidden; }
.progress-bar__fill { height: 100%; background: var(--accent); border-radius: 999px; transition: width .3s ease; }

/* ---------- Verdict (feedback) ---------- */
.verdict { font-family: var(--font-mono); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: .8rem;
  display: inline-flex; align-items: center; gap: .5rem; padding: .35rem .7rem; border-radius: 999px; margin: 0 0 1rem; }
.verdict.correct { color: var(--known); background: color-mix(in srgb, var(--known) 14%, transparent); }
.verdict.incorrect { color: var(--failing); background: color-mix(in srgb, var(--failing) 14%, transparent); }
.entry { font-family: var(--font-serif); font-size: 1.25rem; }

/* ---------- Tables ---------- */
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
thead th {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-faint); text-align: left; font-weight: 600;
  padding: .5rem .6rem; border-bottom: 1px solid var(--line);
}
tbody td { padding: .6rem .6rem; border-bottom: 1px solid var(--line); }
tbody tr:last-child td { border-bottom: 0; }
.num-cell { font-variant-numeric: tabular-nums; }
.res-yes { color: var(--known); font-weight: 600; }
.res-no { color: var(--failing); font-weight: 600; }

/* ---------- History list ---------- */
.history { list-style: none; margin: 0; padding: 0; }
.history li { display: grid; grid-template-columns: minmax(6.5rem, 1fr) auto minmax(3rem, .5fr); align-items: center; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--line); }
.history li:last-child { border-bottom: 0; }
.history .when { color: var(--ink-soft); font-size: .9rem; }
.history .sc { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.history .history__header { padding-top: 0; }
.history__header .when,
.history__header .num-cell,
.history__header .sc {
  color: var(--ink-faint); font-family: var(--font-mono); font-size: .68rem;
  font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
}

.muted { color: var(--ink-soft); }
.error { color: var(--failing); font-weight: 500; }
.center { text-align: center; }
.big-score { font-family: var(--font-serif); font-size: clamp(3rem, 2rem + 6vw, 5rem); font-weight: 600; line-height: 1; }
.code { font-family: var(--font-mono); font-size: .85em; background: var(--surface-2); padding: .1rem .4rem; border-radius: 6px; }
.toolbar { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; margin-top: 1.4rem; }

/* ---------- Click-to-reveal word (words page) ---------- */
.word-reveal {
  font-family: var(--font-serif); font-size: inherit; color: var(--ink);
  background: none; border: 0; padding: 0; cursor: pointer;
  border-bottom: 1px dashed var(--ink-faint); border-radius: 0;
  transition: color .15s ease, border-color .15s ease;
}
.word-reveal:hover { color: var(--accent); border-bottom-color: var(--accent); transform: none; filter: none; }

.answer-dialog {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); color: var(--ink);
  box-shadow: var(--shadow); padding: 1.6rem; max-width: 32rem; width: calc(100% - 2rem);
}
.answer-dialog::backdrop { background: rgba(27, 27, 42, .4); }
.answer-dialog__word { font-family: var(--font-serif); margin: 0 0 .6rem; }
.answer-dialog__body { color: var(--ink-soft); margin: 0 0 1.2rem; line-height: 1.5; }

/* ---------- Question timer ---------- */
.timer {
  display: inline-flex; align-items: baseline; gap: .1rem;
  font-family: var(--font-mono); font-variant-numeric: tabular-nums;
  font-size: 1.1rem; color: var(--ink-soft);
  padding: .25rem .6rem; border: 1px solid var(--line); border-radius: 999px;
  margin-bottom: 1.4rem;
}
.timer__unit { font-size: .8rem; color: var(--ink-faint); }
.timer--urgent { color: var(--failing); border-color: var(--failing); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}