:root {
  --bg: #faf9f6;
  --ink: #282b25;
  --muted: #70766a;
  --line: #e2e5db;
  --accent: #356b56;
  --accent-soft: #e7f0e8;
  --review: #526b92;
  --review-soft: #eaf0f8;
  font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}
* { box-sizing: border-box; }
/* Keep native scrolling and pinch zoom, without double-tap page zoom. */
html { touch-action: manipulation; }
body { margin: 0; }
button, input { font: inherit; }
button { cursor: pointer; -webkit-tap-highlight-color: transparent; }
button:disabled { cursor: default; opacity: .4; }
button:focus-visible, summary:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
button:hover:not(:disabled) { color: var(--accent); }
[hidden] { display: none !important; }
p { margin-top: 0; }
h1 { font-size: clamp(32px, 4vw, 44px); font-weight: 400; letter-spacing: -1.6px; line-height: 1.2; margin: 20px 0; }
h2 { font-size: 14px; font-weight: 500; margin: 0 0 20px; }
.shell { max-width: 1040px; margin: auto; min-height: 100svh; padding: 24px 40px; display: flex; flex-direction: column; }
.top { display: flex; align-items: center; justify-content: space-between; min-height: 44px; }
.brand { border: 0; padding: 10px 0; background: none; font-weight: 600; font-size: 19px; letter-spacing: -.9px; color: var(--ink); }
.brand span { color: var(--accent); }
.top nav { display: flex; align-items: center; }
.plain { border: 0; background: none; color: var(--muted); padding: 12px 0; font-size: 12px; min-height: 44px; }
.icon { display: grid; place-items: center; width: 44px; height: 44px; }
main { flex: 1; display: flex; flex-direction: column; justify-content: center; }
.concept, .quiz { width: min(100%, 640px); margin: 52px auto; }
/* A quiet paper surface for the active lesson; keep its original content width. */
.concept, .quiz.typed, .recall-ready {
  width: min(100%, 722px);
  padding: 30px 40px 26px;
  border: 1px solid #e5e3da;
  border-radius: 16px;
  background: linear-gradient(160deg, #fffefa, #f7f6ef);
  box-shadow: 0 2px 3px #282b2504, 0 12px 32px #282b2507;
}
.study-head { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.eyebrow, .badge { font-size: 11px; font-weight: 500; letter-spacing: 1px; text-transform: uppercase; color: var(--muted); }
.eyebrow { margin: 0; }
.round-label { margin-left: 8px; color: var(--muted); font-weight: 400; }
.counter { font-size: 11px; font-variant-numeric: tabular-nums; color: var(--muted); letter-spacing: .5px; }
.counter span { color: var(--muted); }
.concept-body { padding: 44px 0 40px; }
.grammar-topic { color: var(--muted); font-size: 12px; font-weight: 400; line-height: 1.4; margin: 0 0 12px; }
.quiz .grammar-topic { margin-top: 28px; }
.word { font-size: clamp(42px, 6.5vw, 72px); font-weight: 400; line-height: 1.15; letter-spacing: -.045em; margin: 0 0 42px; overflow-wrap: anywhere; }
.translations { display: grid; grid-template-columns: repeat(auto-fit, minmax(155px, 1fr)); gap: 24px; }
.translation h3 { font-size: clamp(20px, 2.2vw, 25px); font-weight: 400; letter-spacing: -.5px; line-height: 1.45; margin: 12px 0 0; }
.translation-value { display: flex; align-items: baseline; gap: 10px; }
.translation [data-speak] { position: relative; border: 0; background: none; color: var(--muted); padding: 10px 5px; min-width: 32px; min-height: 40px; flex-shrink: 0; }
.translation [data-speak]::after { content: ''; position: absolute; right: 1px; top: 5px; width: 5px; height: 5px; border-radius: 50%; opacity: 0; }
.translation [data-speak][data-audio-state="loading"]::after { opacity: 1; border: 1px solid var(--accent); }
.translation [data-speak][data-audio-state="playing"]::after { opacity: 1; background: var(--accent); }
#audio-status:empty { display: none; }
.actions { display: flex; justify-content: space-between; align-items: center; gap: 20px; border-top: 1px solid var(--line); padding-top: 20px; }
.primary { border: 0; border-radius: 7px; background: var(--accent); color: #fff; min-height: 44px; padding: 12px 19px; font-size: 13px; display: inline-flex; align-items: center; justify-content: center; gap: 30px; }
.primary:hover:not(:disabled) { background: #285440; color: #fff; }
.secondary { background: none; border: 1px solid var(--line); border-radius: 7px; color: var(--ink); min-height: 44px; padding: 12px 16px; font-size: 12px; }
.hint { font-size: 11px; color: var(--muted); line-height: 1.6; }
.muted { color: var(--muted); font-size: 13px; line-height: 1.7; }
.footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--muted); font-size: 10px; }
.footer .plain { font-size: 11px; }
.note { margin-top: 22px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.note summary { cursor: pointer; width: fit-content; padding: 5px 0; }
.note p { max-width: 500px; margin: 8px 0 0; }
/* Recall: the prompt and input share one visual axis. */
.typed .word { margin: 42px 0 38px; }
.typed-answer { display: block; width: 100%; border: 0; border-bottom: 1px solid #aab19f; border-radius: 0; background: none; color: var(--ink); font: inherit; font-size: clamp(22px, 3vw, 28px); line-height: 1.5; padding: 12px 0; margin-top: 4px; }
.typed-answer:focus-visible { outline: none; border-bottom: 2px solid var(--accent); padding-bottom: 11px; }
.typed-answer::placeholder { color: #92998a; font-weight: 400; }
.typed-answer.correct { border-color: var(--accent); }
.typed-answer.incorrect { border-color: #ad7863; }
#recall-form { position: relative; }
.input-tools { margin-top: 8px; width: fit-content; max-width: 100%; }
.input-tools summary { cursor: pointer; color: var(--muted); font-size: 11px; list-style: none; padding: 12px 0; }
.input-tools summary::-webkit-details-marker { display: none; }
.input-tools summary span { margin-left: 10px; }
.input-tools[open] summary span { display: none; }
.accent-keys { display: flex; flex-wrap: wrap; gap: 6px; padding-bottom: 8px; }
.accent-keys button { border: 1px solid var(--line); border-radius: 5px; background: none; color: var(--ink); min-width: 38px; min-height: 38px; font-size: 15px; }
.accent-keys button:hover:not(:disabled) { background: #edf0e7; }
.input-hint { margin: 0; position: absolute; right: 0; top: 108px; pointer-events: none; }
.typed-feedback { min-height: 70px; padding: 16px 0; font-size: 13px; line-height: 1.5; }
.typed-feedback strong { display: block; font-size: 23px; font-weight: 400; letter-spacing: -.3px; margin-top: 4px; }
.typed-feedback.is-correct { color: var(--accent); }
.typed .actions { min-height: 65px; }
.typed .actions .hint { max-width: 270px; }
.typed:has(.typed-answer[readonly]) .input-hint { display: none; }
.key-hint { font-size: 15px; color: #c9d1c1; }
/* Secondary screens */
.settings { width: min(100%, 520px); margin: 40px auto; }
.back { margin-bottom: 16px; }
.settings-section { padding: 24px 0; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.langs { display: flex; gap: 8px; flex-wrap: wrap; }
.lang { border: 1px solid var(--line); border-radius: 6px; background: none; padding: 12px; color: var(--muted); font-size: 12px; flex: 1; display: flex; gap: 14px; justify-content: space-between; min-height: 44px; }
.lang.selected { color: var(--accent); border-color: #a6c5b1; background: var(--accent-soft); }
.routine { padding: 7px 0 24px; border-bottom: 1px solid var(--line); }
.routine summary { cursor: pointer; font-size: 13px; padding: 8px 0; }
.routine summary span { float: right; color: var(--muted); font-size: 11px; }
.routine > p { margin-top: 20px; }
.counts { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.counts label { font-size: 12px; color: var(--muted); }
.counts input { display: block; width: 100%; padding: 12px; margin-top: 8px; border: 1px solid var(--line); border-radius: 5px; background: none; color: var(--ink); }
.stat { display: flex; justify-content: space-between; gap: 20px; font-size: 12px; }
.center { text-align: center; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 28px 0; padding: 24px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metric { font-size: 12px; color: var(--muted); }
.metric strong { display: block; font-size: 28px; font-weight: 400; color: var(--accent); margin-bottom: 6px; }
.intro { margin-top: 40px; }
.history-row { padding: 18px 0; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; gap: 15px; font-size: 13px; }
.empty { padding: 60px 0; }
.error { font-size: 12px; color: #9b5943; }
.card { border: 0; background: none; }
.summary-view .eyebrow { margin-bottom: 24px; }
@media (max-width: 600px) {
  .shell { padding: 16px 24px; }
  .concept, .quiz { margin: 36px auto; }
  .concept, .quiz.typed, .recall-ready { padding: 24px 20px 20px; border-radius: 12px; }
  .concept-body { padding: 34px 0 30px; }
  .word { font-size: 48px; margin-bottom: 30px; }
  .translations { grid-template-columns: 1fr; gap: 12px; }
  .translation { display: grid; grid-template-columns: 78px 1fr; align-items: center; gap: 12px; }
  .translation h3 { margin: 0; font-size: 22px; }
  .translation-value { justify-content: space-between; }
  .badge { font-size: 10px; letter-spacing: .7px; }
  .actions { gap: 14px; padding-top: 16px; }
  .primary { padding: 12px 16px; gap: 22px; }
  .footer { font-size: 9px; }
  .typed .word { margin: 32px 0; }
  .input-hint { position: static; margin-top: 0; font-size: 10px; }
  .typed-feedback { min-height: 62px; }
  .typed .actions .hint { max-width: 140px; }
  .settings { margin: 24px auto; }
  .metrics { gap: 12px; }
  .metric strong { font-size: 25px; }
  .stat { font-size: 11px; }
  .lang { padding: 10px; }
}
/* Keep the prompt and actions in place when the helper controls give way to feedback. */
.typed:has(.typed-answer[readonly]) .typed-feedback { min-height: 118px; }
@media (max-width: 600px) {
  .typed:has(.typed-answer[readonly]) .typed-feedback { min-height: 126px; }
}

.prompt-cue { color: var(--muted); font-size: .62em; letter-spacing: -.025em; white-space: nowrap; }

.prompt-note { display: inline-block; color: var(--muted); font-size: .34em; letter-spacing: 0; vertical-align: middle; }

.translation .translation-text, .correct-translation .translation-text { border: 0; border-bottom: 1px solid transparent; background: none; padding: 0; color: inherit; text-align: left; font: inherit; letter-spacing: inherit; line-height: inherit; }
.translation-text:hover, .translation-text[aria-expanded="true"] { border-bottom-color: var(--line); color: var(--accent); }
.explanation { position: fixed; z-index: 20; width: min(300px, calc(100vw - 24px)); max-height: calc(100dvh - 24px); overflow-y: auto; padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); box-shadow: 0 8px 28px #282b2518; }
.explanation-head { display: flex; align-items: center; justify-content: space-between; }
.explanation-head .plain { padding: 0; min-width: 32px; min-height: 32px; font-size: 20px; }
.explanation-meaning { font-size: 17px; margin: 4px 0 6px; }
.explanation .muted { margin-bottom: 8px; }
.explanation-more summary { width: fit-content; cursor: pointer; color: var(--muted); font-size: 12px; padding: 8px 0; }
.explanation-more p { margin-top: 6px; max-width: 520px; }

.translation-text { white-space: normal; }
.meaning-cue { color: var(--muted); font-size: .8em; }

.details-overlay { position: fixed; inset: 0; margin: auto; width: min(680px, calc(100vw - 32px)); max-width: calc(100vw - 32px); height: fit-content; max-height: min(760px, calc(100dvh - 48px)); border: 1px solid var(--line); border-radius: 16px; padding: 0 28px 28px; background: var(--bg); color: var(--ink); overflow-y: auto; overscroll-behavior: contain; box-shadow: 0 20px 70px #282b2526; }
.details-overlay::backdrop { background: #282b2526; }
.details-header { position: sticky; top: 0; z-index: 2; background: var(--bg); padding: 12px 0; display: flex; align-items: center; justify-content: space-between; }
.details-header [data-close] { font-size: 24px; min-width: 44px; }
.details-overlay h2 { font-size: 30px; margin: 22px 0 8px; }
.details-overlay h3 { font-size: 13px; font-weight: 600; margin: 0 0 12px; }
.details-overlay h4 { font-size: 15px; font-weight: 500; margin: 20px 0 8px; }
.details-overlay p { font-size: 14px; line-height: 1.65; }
.details-overlay .details-gloss { font-size: 20px; }
.details-overlay section { border-top: 1px solid var(--line); padding: 22px 0; }
.details-context { font-size: 18px !important; }
.word-picker { display: flex; flex-wrap: wrap; gap: 8px; }
.word-picker button { padding: 10px 14px; background: none; border: 1px solid var(--line); border-radius: 6px; color: var(--ink); }
.word-picker button[aria-pressed="true"] { background: #edf0e7; border-color: var(--accent); }
.details-overlay dl { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; font-size: 13px; }
.details-overlay dt { color: var(--muted); }.details-overlay dd { margin: 0; }
.details-overlay table { width: 100%; border-collapse: collapse; text-align: left; font-size: 13px; }
.details-overlay th,.details-overlay td { padding: 10px 6px; border-bottom: 1px solid var(--line); }
.details-overlay caption { text-align: left; caption-side: bottom; padding-top: 10px; }
.detail-sources { margin-top: 20px; font-size: 12px; }.detail-sources summary { cursor: pointer; padding: 10px 0; }.detail-sources a { color: var(--accent); }

.details-overlay .selected-form { background: #edf0e7; font-weight: 500; }


.report-dialog { width: min(480px, calc(100vw - 24px)); max-height: calc(100dvh - 24px); overflow: auto; border: 1px solid var(--line); border-radius: 12px; padding: 24px; background: var(--bg); color: var(--ink); }
.report-dialog::backdrop { background: #282b2540; }
.report-dialog h2 { font-size: 21px; }
.report-dialog label { display: block; margin: 20px 0 8px; }
.report-dialog textarea { width: 100%; padding: 10px; resize: vertical; font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; }
.report-dialog .actions { flex-wrap: wrap; gap: 12px; }

.course-units { display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,280px),1fr)); gap: 16px; margin: 24px 0; }
.course-unit { padding: 20px; border: 1px solid var(--line); border-radius: 8px; }
.course-unit h2 { font-size: 18px; }
.course-unit p { line-height: 1.5; }
.footer > div { display: flex; gap: 20px; }

.contrast-choices {display:grid;gap:12px;margin:28px 0;}
.contrast-choices button {text-align:left;white-space:normal;}
.course-unit > button {margin:8px 12px 0 0;}

/* C5: optional, brief motion. No timers or animation-dependent interactions. */
@media (prefers-reduced-motion: no-preference) {
  button { transition: color 120ms ease-out, background-color 120ms ease-out, border-color 120ms ease-out; }
  .explanation:not([hidden]), .report-dialog[open] { animation: reveal 140ms ease-out; }
  .details-overlay[open] { animation: details-enter 180ms ease-out; }
  .details-overlay[open]::backdrop, .report-dialog[open]::backdrop { animation: reveal 140ms ease-out; }
  .typed-feedback:not(:empty) { animation: reveal 140ms ease-out; }
}
@keyframes reveal { from { opacity: 0; } to { opacity: 1; } }
@keyframes details-enter { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateX(0); } }

/* Learning-card movement only; no transform while a fixed popover is open. */
@media (prefers-reduced-motion: no-preference) {
  .concept.card-next:not(:has(.explanation:not([hidden]))) { animation: card-up 240ms cubic-bezier(.2,.7,.3,1); }
  .concept.card-prev:not(:has(.explanation:not([hidden]))) { animation: card-down 240ms cubic-bezier(.2,.7,.3,1); }
}
@keyframes card-up { from { opacity: .35; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes card-down { from { opacity: .35; transform: translateY(-24px); } to { opacity: 1; transform: translateY(0); } }

/* Equal navigation halves form the bottom edge of the learning card. */
.concept, .recall-ready { padding-bottom: 0; }
.learning-navigation { display: grid; grid-template-columns: 1fr 1fr; margin: 0 -40px; border-top: 1px solid var(--line); }
.learning-navigation button { min-height: 64px; border: 0; background: #e7f0e880; color: var(--accent); font-size: 26px; line-height: 1; }
.learning-navigation button:first-child { border-right: 1px solid var(--line); border-radius: 0 0 0 15px; }
.learning-navigation button:last-child { border-radius: 0 0 15px 0; }
.learning-navigation button:hover:not(:disabled) { background: #dceade; }
.learning-navigation button:focus-visible { outline-offset: -6px; }
@media (max-width: 600px) {
  .learning-navigation { margin-inline: -20px; }
  .learning-navigation button { min-height: 60px; }
  .learning-navigation button:first-child { border-bottom-left-radius: 11px; }
  .learning-navigation button:last-child { border-bottom-right-radius: 11px; }
}

.ready-body { padding: 40px 0 56px; }

/* Color marks learning state without adding controls or relying on color alone. */
.study-label { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; min-width: 0; }
.study-head > .counter { flex-shrink: 0; }
.phase-badge { display: inline-flex; align-items: center; gap: 6px; padding: 5px 9px; border-radius: 20px; font-size: 10px; font-weight: 600; line-height: 1.2; letter-spacing: .7px; text-transform: uppercase; vertical-align: middle; }
.phase-badge::before { content: ''; width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.phase-new { color: var(--accent); background: var(--accent-soft); }
.phase-review { color: var(--review); background: var(--review-soft); }
.concept { border-color: #d8e4d8; background: linear-gradient(155deg, #fffefa 35%, #edf3e9); }
.review-card { border-color: #d9e1ed; background: linear-gradient(155deg, #fffefa 35%, #eef2f8); }
.review-card .study-head > .eyebrow { color: var(--review); }
.course-unit { background: #fffefa; border-top: 3px solid #b8cdbb; }

/* IPA stays secondary to the translation, and is available in recall only after submission. */
.ipa-guide { margin: 8px 0 0; color: var(--muted); font-family: 'DejaVu Sans', 'Arial', sans-serif; font-size: 13px; line-height: 1.65; overflow-wrap: anywhere; }
.ipa-label { font-family: Inter, sans-serif; font-size: 9px; letter-spacing: .5px; white-space: nowrap; }
.explanation .ipa-guide { margin: 2px 0 10px; }
.ipa-help { margin: 12px 0 20px; color: var(--muted); font-size: 12px; }
.ipa-help summary { cursor: pointer; padding: 6px 0; }
.ipa-help a { color: var(--accent); }
@media (max-width: 600px) { .translation > .ipa-guide { grid-column: 2; margin-top: -6px; } }

.sound-reference { margin: 14px 0 24px; border: 1px solid var(--line); border-radius: 10px; padding: 0 12px; }
.sound-reference > summary { cursor: pointer; padding: 14px 0; color: var(--accent); font-size: 13px; }
.sound-controls { display: flex; flex-wrap: wrap; gap: 14px; margin: 12px 0; }
.sound-kinds { display: flex; gap: 6px; }
.sound-kinds button { border: 1px solid var(--line); border-radius: 6px; padding: 10px; background: none; color: var(--ink); }
.sound-kinds button[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.sound-controls label { font-size: 12px; display: flex; align-items: center; gap: 8px; }
.sound-controls select { font: inherit; color: var(--ink); background: var(--bg); padding: 8px; border: 1px solid var(--line); border-radius: 5px; max-width: 170px; }
.ipa-table-scroll { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; }
.ipa-table-scroll:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.details-overlay .ipa-chart-table { font-size: 10px; }
.ipa-chart-table th { font-weight: 500; color: var(--muted); }
.ipa-chart-table td { min-width: 50px; }
.ipa-chart-table button { display: inline-block; min-width: 44px; min-height: 44px; padding: 4px; font: 23px 'DejaVu Sans',Arial,sans-serif; color: var(--ink); border: 0; border-radius: 6px; background: none; }
.ipa-chart-table button:hover,.ipa-chart-table button[data-playing] { background: var(--accent-soft); color: var(--accent); }
.ipa-chart-table button:focus-visible { outline-offset: -2px; }
.details-overlay .ipa-chart-table caption { font-size: 10px; padding: 10px; }
.ipa-selection { padding-top: 14px; }
.ipa-selection > strong { font: 25px 'DejaVu Sans',Arial,sans-serif; color: var(--accent); }
.details-overlay .ipa-selection p { font-size: 12px; margin: 6px 0; }
.ipa-selection a { color: var(--accent); }
.ipa-credits { margin: 14px 0; font-size: 12px; color: var(--muted); }
.ipa-credits summary { cursor: pointer; }

.details-overlay .sound-reference .hint { font-size: 11px; line-height: 1.6; }
.details-overlay .ipa-chart-table td,.details-overlay .ipa-chart-table th { padding: 4px 6px; }

/* Details expand into a floating panel; sound exploration replaces its contents. */
[data-sounds-view] .sound-reference { border: 0; padding: 0; margin: 0; }
[data-sounds-view] .sound-reference > summary { display: none; }
.details-overlay [data-explore-sounds] { margin-bottom: 20px; }
.details-overlay h2 { overflow-wrap: anywhere; }
@media (max-width: 600px) {
 .details-overlay { width: calc(100vw - 24px); max-width: calc(100vw - 24px); max-height: calc(100dvh - 24px); padding: 0 18px 20px; border-radius: 12px; }
}

button.ipa-guide { display: block; padding: 2px 0; border: 0; background: transparent; text-align: left; cursor: pointer; text-decoration: underline; text-decoration-style: dotted; text-underline-offset: 4px; }
button.ipa-guide:hover { color: var(--ink); }
.pronunciation-overlay .ipa-help { margin-bottom: 22px; }

/* Compact meaning and on-demand grammar help. */
.explanation-head { justify-content: flex-end; height: 16px; }
.grammar-link { font: inherit; color: inherit; padding: 0; border: 0; background: none; text-decoration: underline dotted; text-underline-offset: 3px; cursor: pointer; }
.grammar-definition:not([hidden]) { display: block; padding: 10px 12px; margin: 8px 0; border-left: 2px solid var(--accent); background: var(--accent-soft); color: var(--ink); font-size: 13px; font-weight: 400; }
.ipa-transcription { font: 24px/1.8 'DejaVu Sans',Arial,sans-serif; margin: 8px 0 20px; white-space: pre-wrap; }
.ipa-transcription button { font: inherit; color: inherit; padding: 1px 2px; border: 0; border-radius: 4px; background: transparent; cursor: pointer; }
.ipa-transcription button:hover,.ipa-transcription button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); }
.sound-controls { justify-content: space-between; align-items: center; }
.vowel-chart { position: relative; height: 290px; margin: 32px 8px 20px 0; }
.vowel-chart svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.vowel-chart path { fill: none; stroke: var(--line); stroke-width: .4; }
.vowel-pair { position: absolute; transform: translate(-50%,-50%); display: flex; white-space: nowrap; background: var(--bg); border-radius: 5px; }
.sound-reference [data-ipa-sound] { font: 23px 'DejaVu Sans',Arial,sans-serif; min-width: 30px; min-height: 36px; padding: 3px; color: var(--ink); border: 0; border-radius: 5px; background: none; cursor: pointer; }
.sound-reference [data-ipa-sound]:hover,.sound-reference [data-ipa-sound][aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); }
.axis { position: absolute; font-size: 10px; color: var(--muted); }
.axis.front { left: 18%; top: -20px; transform: translateX(-50%); }
.axis.central { left: 53%; top: -20px; transform: translateX(-50%); }
.axis.back { left: 88%; top: -20px; transform: translateX(-50%); }
.axis.height { left: 0; transform: translateY(-50%); }
.consonant-pair { display: grid; grid-template-columns: 1fr 1fr; min-width: 64px; }
.consonant-pair > span { min-width: 30px; }
.supplemental-sounds { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.supplemental-sounds > span { font-size: 11px; color: var(--muted); margin-right: 12px; }
.ipa-selection:empty,[data-ipa-error]:empty { display: none; }
.ipa-selection { font-size: 12px; color: var(--muted); }
.sound-credit { display: inline; margin-left: 8px; font-size: 11px; }
.sound-credit > summary { display: inline; cursor: pointer; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@media(max-width:600px){ .vowel-chart { height: 250px; } .vowel-pair [data-ipa-sound] { min-width: 24px; font-size: 21px; } }

/* Quick meaning has two direct routes: transcription and grammar cue. */
.explanation { padding: 12px 16px; }
.explanation-head { position: absolute; top: 3px; right: 5px; height: auto; }
.explanation .explanation-meaning { margin: 0 24px 5px 0; }
.explanation .ipa-guide { margin: 0 0 7px; }
.quick-grammar { display: block; padding: 0; border: 0; background: none; color: var(--muted); font: inherit; font-size: 12px; text-align: left; text-decoration: underline dotted; text-underline-offset: 3px; cursor: pointer; }
.quick-grammar:hover { color: var(--ink); }
/* Preserve the full consonant grid at desktop widths without horizontal scrolling. */
.details-overlay .ipa-chart-table { table-layout: fixed; font-size: 9px; }
.details-overlay .ipa-chart-table th { overflow-wrap: anywhere; }
.details-overlay .ipa-chart-table th:first-child { width: 76px; }
.details-overlay .ipa-chart-table td,.details-overlay .ipa-chart-table th { min-width: 0; padding: 4px 2px; }
.consonant-pair { min-width: 0; }
.consonant-pair > span { min-width: 0; }
.sound-reference [data-ipa-sound] { font-size: 18px; min-width: 24px; min-height: 30px; padding: 2px; }
.ipa-chart-table [data-ipa-sound] { font-size: 17px; min-width: 20px; min-height: 30px; padding: 1px; }
@media(max-width:600px){
 .vowel-pair [data-ipa-sound] { font-size: 18px; min-width: 24px; }
 .details-overlay .ipa-chart-table { min-width: 520px; }
}

/* Keep overlays dense enough to read without a long scroll. */
.details-overlay { padding-bottom: 18px; }
.details-header { padding: 4px 0; }
.details-header [data-close] { min-height: 36px; padding: 4px; }
.details-overlay h2 { font-size: 26px; margin: 4px 0 6px; }
.details-overlay h3 { margin-bottom: 8px; }
.details-overlay h4 { margin: 10px 0 5px; }
.details-overlay p { margin: 6px 0; line-height: 1.45; }
.details-overlay .details-gloss { font-size: 18px; }
.details-overlay section { padding: 12px 0; }
.details-overlay dl { gap: 3px 12px; margin: 8px 0; }
.details-overlay th,.details-overlay td { padding: 6px; }
.word-picker { gap: 5px; }
.word-picker button { padding: 6px 10px; }
.sentence-context,.article-guide { margin: 10px 0; font-size: 13px; }
.sentence-context > summary,.article-guide summary { cursor: pointer; color: var(--accent); padding: 4px 0; }
.article-guide[open] { border-left: 2px solid var(--line); padding-left: 12px; }
.article-kind { display: flex; align-items: center; gap: 8px; margin: 10px 0 6px; }
.article-kind select { font: inherit; max-width: 100%; }
.details-overlay .article-table { font-size: 12px; }
.article-table th { font-weight: 500; }
.details-overlay .article-example { margin-top: 10px; }
.pronunciation-title { display: flex; align-items: center; gap: 10px; }
.pronunciation-title h2 { margin-bottom: 0; }
.overlay-speaker { position: relative; border: 0; background: none; color: var(--muted); min-width: 36px; min-height: 36px; padding: 8px; flex-shrink: 0; }
.overlay-speaker::after { content: ''; position: absolute; right: 2px; top: 3px; width: 5px; height: 5px; border-radius: 50%; opacity: 0; }
.overlay-speaker[data-audio-state="loading"]::after { opacity: 1; border: 1px solid var(--accent); }
.overlay-speaker[data-audio-state="playing"]::after { opacity: 1; background: var(--accent); }
[data-word-audio-error]:empty { display: none; }
.ipa-transcription { margin: 4px 0 12px; }

/* Help floats above its parent; opening it never expands the parent layout. */
.help-link { display: block; width: fit-content; margin: 9px 0; padding: 2px 0; border: 0; background: transparent; color: var(--accent); font: inherit; font-size: 13px; text-align: left; cursor: pointer; text-decoration: underline dotted; text-underline-offset: 3px; }
.help-overlay.help-small { width: min(460px, calc(100vw - 32px)); }
.help-overlay h2 { font-size: 20px; margin-bottom: 12px; }
.help-overlay::backdrop { background: #282b251c; }
.ipa-selection .help-link { display: inline-block; margin: 0 0 0 8px; font-size: 12px; }

/* C7: animate feedback only after a new submission, never restored feedback. */
.answer-sound { font-size: 12px; margin-bottom: 12px; }
@media (prefers-reduced-motion: no-preference) {
  .answer-correct #answer-feedback, .answer-correct .contrast-choices { animation: answer-lift 240ms ease-out; }
  .answer-incorrect #answer-feedback, .answer-incorrect .contrast-choices { animation: answer-nudge 240ms ease-out; }
}
@keyframes answer-lift { 50% { transform: translateY(-3px); } }
@keyframes answer-nudge { 25% { transform: translateX(-3px); } 75% { transform: translateX(3px); } }

.correct-translation { display: flex; align-items: center; gap: 10px; }
.correct-translation strong { min-width: 0; overflow-wrap: anywhere; }
.correct-translation > button { flex-shrink: 0; display: inline-flex; align-items: center; padding: 8px; }

.top .restart-day { margin-right: 18px; }

#account-form { display: grid; gap: 12px; max-width: 360px; }
#account-form input { width: 100%; border: 1px solid var(--line); border-radius: 6px; padding: 12px; background: var(--bg); color: var(--ink); font: inherit; }
.account-actions { display: flex; gap: 18px; flex-wrap: wrap; }

/* Settings: everyday preferences first, maintenance on demand. */
.settings { width: min(100%, 560px); margin: 28px auto 48px; }
.settings .back { margin-bottom: 12px; }
.settings-heading { margin-bottom: 28px; }
.settings-heading h1 { margin: 8px 0 10px; }
.settings-heading p { font-size: 14px; }
.settings-section { margin: 0 0 12px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 14px; background: #fffefa; }
.settings-section h2 { margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.settings-section .hint { line-height: 1.6; margin-bottom: 16px; }
.settings-section p:last-child { margin-bottom: 0; }
.settings .langs { gap: 8px; }
.settings .lang { border-radius: 8px; padding: 12px; }
.sound-setting { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.sound-setting .hint { margin: 0; }
.sound-toggle { flex: 0 0 48px; height: 44px; padding: 8px 0; border: 0; background: transparent; position: relative; }
.sound-toggle::before { content: ''; position: absolute; inset: 9px 0; border-radius: 20px; background: #d6d9d0; }
.sound-toggle span { display: block; position: relative; width: 20px; height: 20px; margin-left: 3px; border-radius: 50%; background: white; box-shadow: 0 1px 3px #0002; }
.sound-toggle[aria-checked="true"]::before { background: var(--accent); }
.sound-toggle[aria-checked="true"] span { transform: translateX(22px); }
.account-identity { font-size: 14px; overflow-wrap: anywhere; margin: 0 0 10px; }
.account-status { color: var(--muted); font-size: 12px; line-height: 1.6; margin: 0 0 12px; }
.account-actions { gap: 8px 18px; }
.account-actions .secondary { font-size: 12px; padding: 11px 15px; border-radius: 8px; }
.account-options { border-top: 1px solid var(--line); margin-top: 16px; padding-top: 4px; }
.account-options summary { font-size: 12px; color: var(--muted); cursor: pointer; padding: 14px 0 8px; }
.account-options .hint { margin: 12px 0 0; }
.settings > .routine { padding: 0 4px; }
.settings > .routine summary { padding: 20px 0; font-size: 13px; }
.settings > .routine[open] { padding-bottom: 20px; }
.settings > .routine > p { margin-top: 0; font-size: 13px; line-height: 1.7; }
.settings > .routine .counts { margin: 20px 0; }
.session-facts { display: grid; gap: 12px; margin-top: 24px; color: var(--muted); }
@media (max-width: 540px) {
  .settings-section { padding: 18px; }
  .settings .lang { gap: 8px; padding: 12px 10px; }
  .account-actions .secondary { flex: 1; }
}

.account-actions .provider-button { padding: 0; border: 0; background: transparent; height: 44px; border-radius: 4px; flex: none; }
.provider-button img { display: block; height: 44px; width: auto; }
.provider-button:hover:not(:disabled) { box-shadow: 0 0 0 2px #282b2518; }
.report-inbox { width: min(760px, calc(100vw - 32px)); }
.inbox-report { border-top: 1px solid var(--line); padding: 20px 0; }
.inbox-report h3 { font-size: 17px; font-weight: 500; margin: 16px 0 8px; }
.inbox-meta { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 12px; color: var(--muted); }
.inbox-meta select { padding: 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); }
.report-note { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.6; }
.inbox-report summary { cursor: pointer; font-size: 12px; color: var(--muted); }
.inbox-report pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 11px; max-height: 300px; overflow: auto; }

/* Mobile navigation stays reachable while the lesson itself scrolls normally. */
.mobile-nav-label { display: none; }
@media (max-width: 600px) {
  .shell:has(.learning-navigation) { padding-bottom: calc(104px + env(safe-area-inset-bottom, 0px)); }
  .concept, .recall-ready { padding-bottom: 20px; }
  .learning-navigation {
    position: fixed; z-index: 10; left: 0; right: 0; bottom: 0;
    margin: 0; gap: 12px;
    padding: 12px max(16px, env(safe-area-inset-right, 0px)) calc(12px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
    background: var(--bg); box-shadow: 0 -4px 20px #282b2508;
  }
  .learning-navigation button:first-child, .learning-navigation button:last-child {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    min-height: 56px; border: 1px solid var(--line); border-radius: 10px;
  }
  .learning-navigation button:last-child { background: var(--accent); color: white; border-color: var(--accent); }
  .learning-navigation button:last-child:hover { background: #285440; color: white; }
  .mobile-nav-label { display: inline; font-size: 14px; font-weight: 500; line-height: 1.3; }
  .shell:has(.explanation:not([hidden])) .learning-navigation { visibility: hidden; }
  /* Transform only the content: a transformed card would trap its fixed toolbar. */
  .concept.card-next, .concept.card-prev { animation: none !important; }
}
@media (max-width: 600px) and (prefers-reduced-motion: no-preference) {
  .concept.card-next .concept-body { animation: card-up 240ms cubic-bezier(.2,.7,.3,1); }
  .concept.card-prev .concept-body { animation: card-down 240ms cubic-bezier(.2,.7,.3,1); }
}

/* Regional pronunciation stays separate from general settings. */
.top nav { display:flex; align-items:center; gap:12px; }
.pronunciation-control { display:inline-flex; align-items:center; justify-content:center; min-width:44px; min-height:44px; border:1px solid var(--line); border-radius:50%; }
.pronunciation-control:hover,.pronunciation-control[aria-expanded="true"] { background:var(--line); }
/* Compact, quiet rows: native menus retain familiar keyboard/mobile behavior. */
.accent-panel { position:fixed; inset:82px max(20px,calc((100vw - 960px)/2)) auto auto; margin:0; width:310px; max-width:calc(100vw - 32px); max-height:calc(100dvh - 110px); overflow:auto; box-sizing:border-box; border:1px solid #dce2d7; border-radius:20px; padding:8px; background:var(--bg); color:var(--ink); box-shadow:0 16px 48px #25372b18,0 2px 6px #25372b08; }
.accent-panel::backdrop { background:#20282008; }
.accent-row { display:grid; grid-template-columns:30px 100px minmax(0,1fr); align-items:center; gap:4px; padding:6px 8px; }
.accent-row + .accent-row { border-top:1px solid var(--line); }
.accent-row > span { font-size:11px; font-weight:600; letter-spacing:.06em; color:var(--muted); }
.accent-row select { appearance:none; min-height:44px; min-width:0; width:100%; padding:8px 20px 8px 10px; border:0; border-radius:10px; background:transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='m3 4.5 3 3 3-3' fill='none' stroke='%23758375' stroke-width='1.2'/%3E%3C/svg%3E") no-repeat right 6px center; color:var(--ink); font:inherit; font-size:13px; cursor:pointer; }
.accent-row select:hover { background-color:#eaf0e5; }
.accent-row select:focus-visible { outline:2px solid var(--accent); outline-offset:0; background-color:#eaf0e5; }
@media(max-width:600px) { .accent-panel { inset:76px 16px auto auto; } .top nav { gap:8px; } .top .restart-day { margin-right:0; } }

/* Settings: one calm list, with secondary information kept in disclosures. */
.settings { max-width:620px; margin:0 auto; }
.settings-heading { margin:24px 0 32px; }
.settings-heading h1 { font-size:32px; letter-spacing:-1px; font-weight:500; }
.settings-section { margin:0; padding:24px 0; border:0; border-bottom:1px solid var(--line); border-radius:0; background:transparent; }
.settings-section h2 { font-size:14px; font-weight:500; margin:0 0 12px; }
.sound-setting h2 { margin:0 0 4px; }
.settings .langs { display:flex; gap:8px; margin:0; }
.settings .lang { flex:1; min-height:48px; border:1px solid transparent; border-radius:12px; background:#eef0e8; padding:12px 14px; font-size:13px; }
.settings .lang.selected { background:#e0ebdf; border-color:#b9ccbb; color:var(--accent); }
.settings .lang span { font-size:12px; }
.settings > .routine { padding:0; }
.settings > .routine summary { padding:22px 0; font-size:13px; }
.settings .account-identity { font-weight:500; }
.settings .account-status { margin-bottom:12px; }
.settings .account-options { border:0; margin-top:4px; padding-top:0; }
.settings .account-options summary { padding:10px 0; }
@media(max-width:540px) { .settings-heading { margin-top:18px; margin-bottom:20px; } .settings-section { padding:22px 0; } .settings .lang { padding:12px 10px; } }