:root {
  --bg: #0f1115;
  --card: #181b22;
  --card2: #20242d;
  --line: #2a2f3a;
  --text: #f2f3f5;
  --muted: #8d94a3;
  --accent: #ffce3a;
  --on-accent: #1a1500;
  --ok: #3ecf8e;
  --bad: #ff6b6b;
  --radius: 18px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f4ef;
    --card: #ffffff;
    --card2: #f0eee7;
    --line: #e2dfd5;
    --text: #17181c;
    --muted: #6b7080;
    --accent: #f5b800;
    --ok: #16a868;
    --bad: #e04848;
    color-scheme: light;
  }
}
* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}
html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.45 system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
}
body {
  min-height: 100dvh;
}
#app {
  max-width: 560px;
  margin: 0 auto;
  padding: calc(18px + env(safe-area-inset-top)) 16px
    calc(96px + env(safe-area-inset-bottom));
}
body[data-view="session"] #app,
body[data-view="summary"] #app {
  padding-bottom: calc(24px + env(safe-area-inset-bottom));
}
body[data-view="session"] #tabs,
body[data-view="summary"] #tabs {
  display: none;
}
button,
input,
select {
  font: inherit;
  color: inherit;
}
button {
  cursor: pointer;
  border: 0;
  background: none;
}
h1 {
  font-size: 30px;
  letter-spacing: -0.02em;
  margin: 0;
}
h1 span {
  color: var(--accent);
}
h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 26px 0 10px;
}
.sub {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.streak {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 8px 12px;
  text-align: center;
  line-height: 1.1;
  flex: none;
}
.streak b {
  display: block;
  font-size: 20px;
  color: var(--accent);
}
.streak span {
  font-size: 11px;
  color: var(--muted);
}

/* levels */
.levels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.lvl {
  text-align: left;
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  transition:
    border-color 0.15s,
    transform 0.1s;
}
.lvl:active {
  transform: scale(0.98);
}
.lvl b {
  font-size: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.lvl b::after {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--line);
}
.lvl.on {
  border-color: var(--accent);
}
.lvl.on b::after {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: inset 0 0 0 4px var(--card);
}
.lvl span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin: 2px 0 10px;
}
.bar {
  display: block;
  height: 6px;
  border-radius: 6px;
  background: var(--card2);
  overflow: hidden;
}
.bar i {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 6px;
  transition: width 0.3s;
}

.stats3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 18px 0;
}
.stats3 div {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 8px;
  text-align: center;
}
.stats3 b {
  display: block;
  font-size: 24px;
}
.stats3 span {
  font-size: 12px;
  color: var(--muted);
}

.primary,
.ghost {
  display: block;
  width: 100%;
  border-radius: 16px;
  padding: 15px 18px;
  font-weight: 650;
  font-size: 17px;
  transition:
    transform 0.1s,
    opacity 0.15s;
}
.primary {
  background: var(--accent);
  color: var(--on-accent);
}
.ghost {
  background: var(--card);
  border: 1px solid var(--line);
}
.primary:active,
.ghost:active {
  transform: scale(0.98);
}
.primary + .ghost,
.ghost + .ghost {
  margin-top: 10px;
}
.note {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  margin: 14px 0 0;
}

/* session */
.sbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.sbar .bar {
  flex: 1;
  height: 8px;
}
.x {
  font-size: 26px;
  line-height: 1;
  color: var(--muted);
  padding: 4px 8px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px 20px;
  animation: in 0.22s ease-out;
}
@keyframes in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}
.tag {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.word {
  font-size: 34px;
  font-weight: 750;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.mean {
  margin: 4px 0 18px;
  font-size: 18px;
  color: var(--muted);
}
.sent {
  font-size: 22px;
  line-height: 1.35;
  font-weight: 550;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  justify-content: space-between;
}
mark {
  background: none;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}
.blank {
  display: inline-block;
  width: 3.2em;
  border-bottom: 2.5px solid var(--accent);
  transform: translateY(2px);
}
.trans {
  margin: 8px 0 0;
  color: var(--muted);
}
.spk {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card2);
  display: grid;
  place-items: center;
  color: var(--accent);
}
.spk svg {
  width: 22px;
  height: 22px;
}
.spk.big {
  width: 96px;
  height: 96px;
  margin: 10px auto 6px;
  background: var(--accent);
  color: var(--on-accent);
}
.spk.big svg {
  width: 44px;
  height: 44px;
}
.spk:active {
  transform: scale(0.94);
}
.center {
  text-align: center;
}
.opts {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}
.opt {
  text-align: left;
  background: var(--card2);
  border: 1.5px solid transparent;
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 17px;
  transition:
    transform 0.1s,
    border-color 0.15s;
}
.opt:not(:disabled):active {
  transform: scale(0.98);
}
.opt.ok {
  border-color: var(--ok);
  color: var(--ok);
}
.opt.bad {
  border-color: var(--bad);
  color: var(--bad);
}
.opt:disabled:not(.ok):not(.bad) {
  opacity: 0.45;
}
.typer {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}
.typer input {
  background: var(--card2);
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 18px;
  width: 100%;
  outline: none;
}
.typer input:focus {
  border-color: var(--accent);
}
.link {
  color: var(--muted);
  font-size: 14px;
  padding: 8px;
  text-decoration: underline;
}
.actions {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 10px;
  margin-top: 24px;
}
.actions .ghost {
  margin: 0;
  font-size: 15px;
  padding: 15px 8px;
}
.fb {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  animation: in 0.2s ease-out;
}
.fb strong {
  font-size: 18px;
}
.fb.ok strong {
  color: var(--ok);
}
.fb.bad strong {
  color: var(--bad);
}
.pair {
  margin: 6px 0 16px;
}
.pair span {
  color: var(--muted);
}

/* summary */
.score {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1;
  margin: 8px 0 4px;
}
.rows {
  margin: 14px 0 20px;
  display: grid;
  gap: 8px;
}
.row {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
}
.row .grow {
  flex: 1;
  min-width: 0;
}
.row b,
.row small,
.row .ex {
  display: block;
}
.row small {
  color: var(--muted);
  font-size: 14px;
}
.row .ex {
  margin: 8px 0 0;
  font-size: 15px;
}
.row .ex em {
  display: block;
  color: var(--muted);
  font-style: normal;
  font-size: 14px;
}
.st {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
  background: var(--line);
}
.st.learning {
  background: var(--accent);
}
.st.mastered {
  background: var(--ok);
}
.st.miss {
  background: var(--bad);
}

/* words + settings */
.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 14px 0 10px;
}
.chip {
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: 999px;
  padding: 7px 14px;
  font-weight: 600;
  font-size: 14px;
}
.chip.on {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.search {
  width: 100%;
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  outline: none;
}
.search:focus {
  border-color: var(--accent);
}
.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--muted);
  margin: 10px 2px 0;
}
.legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.set {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 16px;
}
.set label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}
.set label:last-child {
  border: 0;
}
.set select {
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 8px;
  max-width: 55%;
}
.set input[type="range"] {
  accent-color: var(--accent);
  width: 50%;
}
.set input[type="checkbox"] {
  width: 22px;
  height: 22px;
  accent-color: var(--accent);
}
.danger {
  color: var(--bad);
}

#tabs {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: center;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--line);
  padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
}
#tabs button {
  flex: 1;
  max-width: 180px;
  padding: 8px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  display: grid;
  gap: 3px;
  justify-items: center;
}
#tabs svg {
  width: 24px;
  height: 24px;
}
#tabs button.on {
  color: var(--accent);
}