:root {
  --bg: #f7f5f0;
  --panel: #ffffff;
  --ink: #1d1d22;
  --muted: #6b6a70;
  --line: #e4e0d8;
  --blue: #1f4fd1;
  --blue-soft: #e8eefc;
  --red: #c8323a;
  --red-soft: #fbe9ea;
  --green: #1d8a4e;
  --green-soft: #e4f4ea;
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15161a;
    --panel: #1f2026;
    --ink: #ecebe8;
    --muted: #9b9aa2;
    --line: #2f3038;
    --blue: #7c9cff;
    --blue-soft: #232c49;
    --red: #ff7a80;
    --red-soft: #3a2226;
    --green: #5fd394;
    --green-soft: #1d3428;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}

a {
  color: var(--blue);
}

h1 {
  font-size: 2rem;
  line-height: 1.15;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 32px 0 10px;
}

h3 {
  margin: 18px 0 8px;
  font-size: 1rem;
}

.kicker {
  margin: 0 0 4px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--red);
  font-weight: 600;
}

.lede {
  margin: 0;
  color: var(--muted);
}

.muted {
  color: var(--muted);
}

header {
  margin-bottom: 20px;
}

header.hub {
  margin: 16px 0 24px;
}

nav.top {
  margin-bottom: 18px;
}

nav.top a {
  text-decoration: none;
  font-weight: 500;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover {
  border-color: var(--blue);
  transform: translateY(-1px);
}

.card .t {
  font-weight: 600;
}

.card .e {
  color: var(--muted);
  font-size: 0.9rem;
}

.card .best {
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--green);
  font-weight: 600;
}

.feature {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card.big {
  padding: 20px;
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.card.big .e {
  color: rgba(255, 255, 255, 0.85);
}

.card.big .t {
  font-size: 1.25rem;
}

.card.big.alt {
  background: var(--panel);
  border-color: var(--line);
  color: var(--ink);
}

.card.big.alt .e {
  color: var(--muted);
}

@media (prefers-color-scheme: dark) {
  .card.big:not(.alt) {
    color: #0f1630;
  }

  .card.big:not(.alt) .e {
    color: rgba(15, 22, 48, 0.8);
  }
}

details.notes {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 0 0 18px;
}

details.notes summary {
  cursor: pointer;
  padding: 12px 16px;
  font-weight: 600;
}

details.notes > div {
  padding: 0 16px 12px;
  border-top: 1px solid var(--line);
}

details.notes p,
details.notes ul {
  margin: 10px 0;
}

table.conj {
  border-collapse: collapse;
  margin: 10px 0;
}

table.conj td,
table.conj th {
  padding: 4px 14px 4px 0;
  vertical-align: top;
  text-align: left;
}

table.conj th {
  font-weight: 600;
  color: var(--muted);
  font-size: 0.85rem;
}

.alpha {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 4px 10px;
}

.progress {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.bar {
  height: 4px;
  background: var(--line);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 14px;
}

.bar i {
  display: block;
  height: 100%;
  background: var(--blue);
  transition: width 0.3s;
}

.qcard {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.tag {
  margin: 0 0 8px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.prompt {
  font-size: 1.45rem;
  font-weight: 500;
  line-height: 1.35;
}

.prompt.word {
  font-size: 2.2rem;
  font-weight: 600;
  text-align: center;
}

.prompt u {
  text-decoration-color: var(--red);
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
}

.blank {
  color: var(--muted);
  font-weight: 400;
}

.qcard .sub {
  margin: 6px 0 0;
  color: var(--muted);
}

.prompt.word + .sub,
.qcard .hint {
  text-align: center;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 12px 0 0;
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
  margin-top: 18px;
}

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.opt {
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  font-size: 1.05rem;
  transition: border-color 0.1s, background 0.1s;
}

.opt:hover:not(:disabled) {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.opt:disabled {
  cursor: default;
}

.opt kbd {
  font: 600 0.72rem ui-monospace, monospace;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 6px;
  background: var(--panel);
}

.options.two .opt {
  justify-content: center;
  padding: 18px;
  font-size: 1.15rem;
  font-weight: 600;
}

.opt.right {
  border-color: var(--green);
  background: var(--green-soft);
}

.opt.wrong {
  border-color: var(--red);
  background: var(--red-soft);
}

form.answer {
  display: flex;
  gap: 8px;
  margin-top: 18px;
}

form.answer input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 1.15rem;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--ink);
}

form.answer input:focus {
  outline: 2px solid var(--blue);
  outline-offset: -1px;
}

form.answer input.right {
  border-color: var(--green);
  background: var(--green-soft);
}

form.answer input.wrong {
  border-color: var(--red);
  background: var(--red-soft);
}

.primary,
.btn {
  display: inline-block;
  padding: 11px 18px;
  border-radius: 10px;
  border: 1px solid var(--blue);
  background: var(--blue);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}

.btn {
  background: transparent;
  color: var(--blue);
}

@media (prefers-color-scheme: dark) {
  .primary {
    color: #0f1630;
  }
}

.primary:disabled {
  opacity: 0.5;
  cursor: default;
}

.accents {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 8px;
}

.accents button {
  min-width: 34px;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
}

.accents button:hover {
  border-color: var(--blue);
}

.feedback:empty {
  display: none;
}

.feedback {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 10px;
}

.feedback.ok {
  background: var(--green-soft);
}

.feedback.bad {
  background: var(--red-soft);
}

.feedback p {
  margin: 0 0 6px;
}

.feedback .next {
  margin-top: 8px;
}

b.ok {
  color: var(--green);
}

.bad,
b.bad {
  color: var(--red);
}

.why {
  color: var(--ink);
  opacity: 0.85;
}

.speak {
  font-size: 1.2rem;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--blue);
  background: var(--blue-soft);
}

.results {
  text-align: left;
}

.big-score {
  font-size: 3rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.03em;
}

ol.missed {
  padding-left: 22px;
}

ol.missed li {
  margin-bottom: 14px;
}

ol.missed .mq {
  font-weight: 500;
}

ol.missed .sub {
  font-size: 0.85rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.modes {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.modes button {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 0.9rem;
}

.modes button[aria-selected="true"] {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.quiz {
  margin-bottom: 20px;
}

.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

ul.nlist {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul.nlist li {
  padding: 3px 0;
  border-bottom: 1px solid var(--line);
}

@media (max-width: 560px) {
  main {
    padding: 18px 14px 60px;
  }

  h1 {
    font-size: 1.6rem;
  }

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

  .qcard {
    padding: 18px 16px;
  }

  .prompt {
    font-size: 1.25rem;
  }
}

.srs-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.srs-stats b {
  color: var(--ink);
}

.srs-stats .new b {
  color: var(--blue);
}

.srs-stats .learn b,
.srs-stats .due b {
  color: var(--red);
}

.srs-stats .known b {
  color: var(--green);
}

.grades {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-top: 16px;
}

.grade {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 6px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  font-weight: 600;
}

.grade:hover:not(:disabled) {
  border-color: var(--blue);
}

.grade:disabled {
  opacity: 0.35;
  cursor: default;
}

.grade kbd {
  font: 600 0.72rem ui-monospace, monospace;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0 5px;
}

@media (max-width: 560px) {
  .grade kbd {
    display: none;
  }

  /* Room for a wrapped result so the buttons never shift. */
  .answer-line {
    min-height: 3em;
  }
}

.srs-footer {
  margin: -8px 0 18px;
  text-align: right;
}

button.link {
  border: 0;
  background: none;
  padding: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-decoration: underline;
}

button.link:hover {
  color: var(--red);
}