:root,
[data-theme="lamp"] {
  color-scheme: light;
  --bg: #e4d2b4;
  --panel: rgba(247, 241, 228, 0.9);
  --line: rgba(42, 33, 24, 0.14);
  --line-strong: rgba(42, 33, 24, 0.4);
  --ink: #2a2118;
  --muted: #6d5c48;
  --paper: #f7f1e4;
  --input: #fffaf1;
  --lamp: #2f6b4f;
  --brass: #b8862b;
  --ok: #2c6b4a;
  --bad: #8a2f2f;
  --shadow: 0 22px 60px rgba(70, 46, 18, 0.16);
  --radius: 20px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Segoe UI", "Helvetica Neue", system-ui, sans-serif;
  --sky-top: #f4e6cc;
  --sky-bot: #d7c09a;
  --glow: rgba(243, 213, 138, 0.55);
  --wood: rgba(90, 62, 28, 0.35);
}

[data-theme="night"] {
  color-scheme: dark;
  --bg: #16110d;
  --panel: rgba(36, 28, 22, 0.9);
  --line: rgba(240, 230, 210, 0.14);
  --line-strong: rgba(240, 230, 210, 0.4);
  --ink: #f0e6d2;
  --muted: #b3a48c;
  --paper: #241c16;
  --input: #140f0b;
  --lamp: #4ea37a;
  --brass: #d4a84b;
  --ok: #8fddb5;
  --bad: #f0a0a0;
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.5);
  --sky-top: #221910;
  --sky-bot: #0e0b08;
  --glow: rgba(232, 184, 74, 0.22);
  --wood: rgba(212, 168, 75, 0.28);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

[hidden] {
  display: none !important;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.sky {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 6%, var(--glow), transparent 28%),
    linear-gradient(180deg, var(--sky-top), var(--sky-bot));
}

.lamp-glow {
  position: absolute;
  width: 42vw;
  height: 42vw;
  right: 4%;
  top: -8%;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--brass) 35%, transparent), transparent 68%);
}

.desk-rule {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6%;
  width: 100%;
  height: 18vh;
}

.desk-rule .wood,
.desk-rule .inlay {
  fill: none;
  stroke: var(--wood);
  stroke-width: 3;
}

.desk-rule .inlay {
  stroke-width: 1.4;
  opacity: 0.7;
}

.desk-rule .blotter rect {
  fill: color-mix(in srgb, var(--lamp) 18%, transparent);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  background: var(--lamp);
  color: var(--paper);
  padding: 0.5rem 0.8rem;
  font-weight: 700;
}

.skip-link:focus {
  top: 1rem;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 2.2rem 1.2rem 3rem;
}

.masthead {
  margin-bottom: 1.4rem;
}

.masthead-row,
.toolbar,
.pager,
.actions,
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

.masthead-row {
  justify-content: space-between;
}

.eyebrow,
.kicker,
.prompt-kicker {
  margin: 0;
  color: var(--lamp);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 700;
}

.wordmark,
.panel-title,
h1, h2 {
  font-family: var(--serif);
  letter-spacing: -0.03em;
}

.wordmark {
  display: block;
  margin: 0.35rem 0 0.6rem;
  color: inherit;
  text-decoration: none;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 700;
}

.lede,
.copy {
  max-width: 42rem;
  color: var(--muted);
}

.lede {
  margin: 0 0 1.1rem;
  font-size: 1.08rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.site-nav a,
.chip,
.mode-btn,
.choice,
.option,
.term-face,
.def-face,
.unit-chip {
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  font: inherit;
  cursor: pointer;
}

.site-nav a[aria-current="page"],
.chip.is-on,
.mode-btn.is-on,
.choice.is-on,
.option.is-on,
.unit-chip.is-on {
  background: var(--lamp);
  color: var(--paper);
  border-color: transparent;
}

.theme-btn,
.btn {
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: inherit;
  border-radius: 999px;
  padding: 0.5rem 0.95rem;
  font: inherit;
  cursor: pointer;
}

.theme-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.theme-mark {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #f3d58a, var(--lamp));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brass) 35%, transparent);
}

.btn.primary {
  background: var(--lamp);
  color: var(--paper);
  border-color: transparent;
}

.btn.ghost {
  background: transparent;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem 1.2rem 1.3rem;
  margin-bottom: 1rem;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.panel-title {
  margin: 0 0 0.35rem;
  font-size: 1.7rem;
}

.subhead {
  margin: 1.1rem 0 0.55rem;
  font-family: var(--serif);
  font-size: 1.15rem;
}

.field-block + .field-block {
  margin-top: 1.4rem;
}

.course-grid,
.choice-grid,
.unit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.course-card,
.choice,
.path-card {
  display: block;
  text-align: left;
  text-decoration: none;
  color: inherit;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.95rem 1rem;
  cursor: pointer;
  font: inherit;
}

.course-card:hover,
.choice:hover,
.path-card:hover,
.option:hover,
.term-face:hover,
.def-face:hover {
  border-color: var(--brass);
}

.course-card .kicker,
.path-card .kicker {
  margin-bottom: 0.35rem;
}

.course-card h3,
.path-card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.25rem;
}

.quiet,
.note {
  color: var(--muted);
  margin: 0.35rem 0 0;
}

.note {
  font-size: 0.95rem;
}

.choice-grid-compact {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.choice.is-on,
.path-card.is-on {
  outline: 2px solid var(--lamp);
}

.controls-row,
.lex-controls,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: end;
  margin: 0.8rem 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.82rem;
  color: var(--muted);
  min-width: 12rem;
  flex: 1;
}

.field input,
.field select,
.answer-row input {
  border: 1px solid var(--line-strong);
  background: var(--input);
  color: var(--ink);
  border-radius: 12px;
  padding: 0.55rem 0.7rem;
  font: inherit;
}

.term-list {
  display: grid;
  gap: 0.7rem;
}

.term-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem 1rem;
}

.term-card.is-flip .term-def {
  display: none;
}

.term-card.is-flip.is-open .term-def {
  display: block;
}

.term-top {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: baseline;
}

.term-name {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
}

.unit-badge {
  flex: none;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--lamp);
}

.term-def {
  margin: 0.45rem 0 0;
}

.stats {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.stats li {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.45rem 0.75rem;
  min-width: 6.5rem;
}

.stats span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.prompt {
  font-family: var(--serif);
  font-size: 1.35rem;
  margin: 0.2rem 0 0.8rem;
}

.detail {
  color: var(--muted);
  margin: -0.4rem 0 0.9rem;
}

.options,
.match-board {
  display: grid;
  gap: 0.55rem;
}

.options {
  grid-template-columns: 1fr;
}

.option,
.term-face,
.def-face {
  border-radius: 14px;
  text-align: left;
}

.option.is-right,
.term-face.is-right,
.def-face.is-right {
  background: color-mix(in srgb, var(--ok) 22%, var(--paper));
  border-color: var(--ok);
}

.option.is-wrong,
.term-face.is-wrong,
.def-face.is-wrong {
  background: color-mix(in srgb, var(--bad) 18%, var(--paper));
  border-color: var(--bad);
}

.match-board {
  grid-template-columns: 1fr 1fr;
}

.feedback {
  margin: 0.8rem 0;
  font-weight: 600;
}

.feedback.is-ok { color: var(--ok); }
.feedback.is-bad { color: var(--bad); }

.answer-row {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
  margin: 0.4rem 0 0.8rem;
}

.answer-row input {
  flex: 1;
  min-width: 12rem;
}

.kbd-hint,
.site-footer {
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  margin-top: 1.6rem;
}

.site-footer a {
  color: var(--lamp);
}

.records {
  padding-left: 1.1rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.7rem;
  padding: 0;
  list-style: none;
}

.summary-grid li {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.7rem 0.85rem;
}

.review {
  margin: 1rem 0;
  display: grid;
  gap: 0.55rem;
}

.review article {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.85rem;
  background: var(--paper);
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: rgba(20, 14, 8, 0.45);
  display: grid;
  place-items: center;
  padding: 1rem;
}

.overlay-card {
  background: var(--paper);
  color: var(--ink);
  border-radius: 18px;
  padding: 1.2rem;
  max-width: 24rem;
  box-shadow: var(--shadow);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.error {
  color: var(--bad);
}

@media (max-width: 640px) {
  .match-board {
    grid-template-columns: 1fr;
  }

  .wordmark {
    font-size: 2.1rem;
  }
}