:root,
:root[data-theme="dark"] {
  --bg: #111827;
  --panel: #182235;
  --panel-2: #202d44;
  --text: #f8fafc;
  --muted: #a9b7cc;
  --line: #314158;
  --accent: #70d6ff;
  --accent-2: #b8f7d4;
  --danger: #ff8a8a;
  --success: #8ef0b1;
  --warning: #ffe58a;
  --body-bg: radial-gradient(circle at top left, #213a5c 0, #111827 34%, #0b1020 100%);
  --panel-bg: rgba(24, 34, 53, .86);
  --badge-bg: rgba(11, 16, 32, .74);
  --field-bg: #111a2b;
  --soft-bg: rgba(255, 255, 255, .05);
  --soft-bg-2: rgba(255, 255, 255, .08);
  --soft-bg-3: rgba(255, 255, 255, .045);
  --accent-soft-bg: rgba(112, 214, 255, .08);
  --accent-focus: rgba(112, 214, 255, .18);
  --overlay-bg: rgba(0, 0, 0, .44);
  --overlay-card-bg: rgba(24, 34, 53, .96);
  --overlay-ok-bg: linear-gradient(135deg, rgba(27, 64, 47, .96), rgba(24, 34, 53, .96));
  --overlay-ng-bg: linear-gradient(135deg, rgba(82, 34, 42, .96), rgba(24, 34, 53, .96));
  --button-text: #07111f;
  --shadow: 0 18px 45px rgba(0, 0, 0, .28);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-2: #eef3f8;
  --text: #172033;
  --muted: #5c6a7f;
  --line: #cfdae8;
  --accent: #2563eb;
  --accent-2: #16a34a;
  --danger: #dc2626;
  --success: #059669;
  --warning: #b45309;
  --body-bg: radial-gradient(circle at top left, #dbeafe 0, #f5f7fb 42%, #edf2f7 100%);
  --panel-bg: rgba(255, 255, 255, .9);
  --badge-bg: rgba(255, 255, 255, .78);
  --field-bg: #ffffff;
  --soft-bg: rgba(37, 99, 235, .055);
  --soft-bg-2: rgba(37, 99, 235, .085);
  --soft-bg-3: rgba(15, 23, 42, .035);
  --accent-soft-bg: rgba(37, 99, 235, .08);
  --accent-focus: rgba(37, 99, 235, .17);
  --overlay-bg: rgba(15, 23, 42, .24);
  --overlay-card-bg: rgba(255, 255, 255, .96);
  --overlay-ok-bg: linear-gradient(135deg, rgba(220, 252, 231, .97), rgba(255, 255, 255, .97));
  --overlay-ng-bg: linear-gradient(135deg, rgba(254, 226, 226, .97), rgba(255, 255, 255, .97));
  --button-text: #ffffff;
  --shadow: 0 18px 45px rgba(15, 23, 42, .12);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--body-bg);
  color: var(--text);
}

button,
input,
select {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

button {
  touch-action: manipulation;
}

button:disabled,
input:disabled {
  cursor: default;
  opacity: .6;
}

.version-badge {
  position: fixed;
  top: max(14px, env(safe-area-inset-top));
  right: max(14px, env(safe-area-inset-right));
  z-index: 20;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--badge-bg);
  backdrop-filter: blur(10px);
  font-size: .8rem;
}

.app-shell {
  width: min(1120px, calc(100% - 28px));
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 34px 0 max(24px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
}

.hero {
  display: grid;
  gap: 12px;
  margin: 14px 0 18px;
  padding-right: 78px;
}

body.is-quiz-active .hero {
  display: none;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: -.05em;
}

h2 {
  margin-bottom: 4px;
  font-size: 1.18rem;
}

.lead,
.section-title p,
.reference-header p,
.score-note,
.question-text {
  color: var(--muted);
  line-height: 1.75;
}

.lead,
.section-title p,
.reference-header p {
  margin-bottom: 0;
}

.panel {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel-bg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.section-title {
  margin-bottom: 18px;
}

.top-page-link {
  position: absolute;
  top: max(14px, env(safe-area-inset-top));
  left: max(14px, env(safe-area-inset-left));
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  color: var(--text);
  background: var(--badge-bg);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
  font-size: .9rem;
  font-weight: 800;
  text-decoration: none;
}

.top-page-link::before {
  content: "←";
  color: var(--accent);
  font-weight: 900;
}

.top-page-link:hover,
.top-page-link:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft-bg);
  outline: none;
}

body.is-quiz-active .top-page-link {
  display: none;
}

body:not(.is-quiz-active) .app-shell {
  padding-top: max(74px, calc(58px + env(safe-area-inset-top)));
}


.controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(150px, 1fr));
  gap: 12px;
  align-items: end;
}

.control-group label,
.control-label,
.label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: .9rem;
}

select,
input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0 12px;
  color: var(--text);
  background: var(--field-bg);
  outline: none;
}

select:focus,
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-focus);
}

.fixed-value {
  min-height: 70px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--soft-bg-3);
}

.fixed-value strong {
  display: block;
  font-size: 1.25rem;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 14px;
  padding: 0 16px;
  color: var(--button-text);
  background: var(--accent);
  font-weight: 750;
}

button:hover:not(:disabled) {
  filter: brightness(1.06);
}

.primary {
  background: var(--accent-2);
}

.ghost {
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--soft-bg);
}

.ad-panel {
  margin-top: 14px;
  padding: 12px;
  border: 1px dashed var(--line);
  border-radius: 18px;
  background: var(--soft-bg-3);
}

.ad-label {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-align: center;
  text-transform: uppercase;
}

.ad-mount {
  min-height: 90px;
}

.ad-mount .adsbygoogle {
  min-height: 90px;
}

.start-btn {
  width: min(360px, 100%);
  min-height: 56px;
  margin-top: 18px;
  font-size: 1rem;
}

.score-note {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid rgba(112, 214, 255, .22);
  border-radius: 16px;
  background: var(--accent-soft-bg);
}

.quiz-layout {
  position: relative;
  display: grid;
  gap: 0;
}

.quiz-layout.is-countdown .quiz-card,
.quiz-layout.is-countdown .reference-panel {
  display: none;
}

.quiz-layout.is-countdown {
  min-height: 360px;
}

.quiz-layout.is-countdown .progress-panel {
  opacity: .72;
}

.progress-panel {
  padding: 14px;
}

.progress-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.progress-title {
  color: var(--muted);
  font-size: .95rem;
  font-weight: 800;
  letter-spacing: .04em;
}

.retire-btn {
  min-height: 42px;
  padding-inline: 16px;
  border-color: rgba(255, 138, 138, .72);
  color: var(--danger);
  background: rgba(255, 138, 138, .12);
  font-size: .95rem;
  font-weight: 900;
}

.retire-btn:hover:not(:disabled),
.retire-btn:focus-visible {
  border-color: var(--danger);
  background: rgba(255, 138, 138, .2);
  filter: none;
}

.progress-head {
  display: grid;
  grid-template-columns: repeat(4, minmax(90px, 1fr));
  gap: 8px;
}

.progress-head > div {
  padding: 12px 10px;
  border-radius: 16px;
  background: var(--soft-bg);
  text-align: center;
}

.progress-head strong {
  display: block;
  font-size: clamp(1.2rem, 4vw, 1.8rem);
}

.progress-bar {
  height: 8px;
  margin-top: 12px;
  border-radius: 999px;
  background: var(--soft-bg-2);
  overflow: hidden;
}

.progress-bar span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .25s ease;
}

.quiz-card {
  padding: clamp(18px, 4vw, 34px);
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.question-meta span {
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--accent-soft-bg);
  color: var(--accent);
  font-size: .9rem;
}

.question-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  gap: 14px;
  margin-bottom: 18px;
}

.question-block {
  min-width: 0;
  padding: clamp(16px, 4vw, 28px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--soft-bg-3);
}

.question-block.accent {
  background: linear-gradient(135deg, rgba(112, 214, 255, .2), rgba(184, 247, 212, .1));
}

.label {
  text-transform: uppercase;
  letter-spacing: .08em;
}

.question-block strong {
  display: block;
  overflow-wrap: anywhere;
  font-size: clamp(2.3rem, 10vw, 6rem);
  line-height: 1;
}

.question-text {
  margin-bottom: 18px;
}

.choices {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.choice-btn {
  min-height: 64px;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--panel-2);
  font-size: clamp(1rem, 3vw, 1.35rem);
  line-height: 1.25;
}

.choice-btn.correct {
  border-color: rgba(142, 240, 177, .85);
  color: #052414;
  background: var(--success);
}

.choice-btn.wrong {
  border-color: rgba(255, 138, 138, .8);
  color: #300606;
  background: var(--danger);
}

.typing-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.reference-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 8px;
}

.ref-cell {
  padding: 10px 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft-bg-3);
  text-align: center;
}

.ref-cell .degree {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: .9rem;
}

.ref-cell .note {
  display: block;
  font-size: 1.2rem;
  font-weight: 800;
}

.ref-cell.active {
  border-color: var(--accent);
  background: var(--accent-soft-bg);
}

.countdown-overlay {
  position: absolute;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 18px;
  background: transparent;
  backdrop-filter: none;
}

.countdown-card {
  width: min(360px, 100%);
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: clamp(28px, 8vw, 48px);
  text-align: center;
  background: var(--overlay-card-bg);
  box-shadow: 0 24px 70px rgba(0, 0, 0, .28);
}

.countdown-label {
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 800;
  letter-spacing: .08em;
}

.countdown-number {
  margin-bottom: 0;
  font-size: clamp(4rem, 22vw, 8rem);
  font-weight: 950;
  line-height: .9;
  color: var(--accent);
}

.result-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 18px;
  background: var(--overlay-bg);
  backdrop-filter: blur(3px);
}

.overlay-card {
  width: min(520px, 100%);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: clamp(24px, 6vw, 40px);
  text-align: center;
  background: var(--overlay-card-bg);
  box-shadow: 0 24px 70px rgba(0, 0, 0, .42);
}

.overlay-card.ok {
  border-color: rgba(142, 240, 177, .74);
  background: var(--overlay-ok-bg);
}

.overlay-card.ng {
  border-color: rgba(255, 138, 138, .72);
  background: var(--overlay-ng-bg);
}

.overlay-title {
  margin-bottom: 10px;
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 900;
  line-height: 1;
}

.overlay-answer,
.overlay-score {
  margin-bottom: 0;
  color: var(--text);
  line-height: 1.7;
}

.overlay-score {
  margin-top: 12px;
  color: var(--muted);
}

.overlay-card button {
  width: min(260px, 100%);
  margin-top: 22px;
}

.summary-panel {
  text-align: center;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(90px, 1fr));
  gap: 10px;
  margin: 20px 0;
}

.summary-grid div {
  padding: 18px 10px;
  border-radius: 18px;
  background: var(--soft-bg);
}

.summary-grid span {
  display: block;
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 900;
}

.summary-grid small {
  color: var(--muted);
}


.summary-settings {
  margin: 4px auto 18px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--soft-bg-3);
  text-align: left;
}

.summary-settings h3 {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: .92rem;
}

.summary-setting-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.summary-setting-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--soft-bg);
}

.summary-setting-chip span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 800;
}

.summary-setting-chip strong {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: .9rem;
}

.summary-detail-block {
  margin: 18px 0 20px;
}

.summary-detail-block > button {
  width: min(320px, 100%);
}

.summary-details {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  text-align: left;
}

.summary-detail-item {
  position: relative;
  overflow: hidden;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--soft-bg-3);
}

.summary-detail-item::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--line);
}

.summary-detail-item.correct {
  border-color: rgba(142, 240, 177, .62);
  background: color-mix(in srgb, var(--success) 9%, var(--soft-bg-3));
}

.summary-detail-item.correct::before {
  background: var(--success);
}

.summary-detail-item.wrong {
  border-color: rgba(255, 138, 138, .72);
  background: color-mix(in srgb, var(--danger) 10%, var(--soft-bg-3));
}

.summary-detail-item.wrong::before {
  background: var(--danger);
}

.summary-detail-head {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 6px;
  align-items: center;
  color: var(--muted);
  font-size: .8rem;
}

.summary-detail-head strong {
  color: var(--text);
  font-size: .96rem;
}

.summary-result-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.5em;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 900;
}

.summary-result-badge.correct {
  color: #052414;
  background: var(--success);
}

.summary-result-badge.wrong {
  color: #300606;
  background: var(--danger);
}

.summary-detail-score {
  justify-self: end;
}

.summary-question-grid {
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  gap: 6px;
  margin: 8px 0;
}

.summary-question-box {
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft-bg);
}

.summary-question-box.accent {
  background: linear-gradient(135deg, rgba(112, 214, 255, .18), rgba(184, 247, 212, .1));
}

.summary-question-box strong {
  display: block;
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: clamp(1.08rem, 4vw, 1.8rem);
  line-height: 1.1;
}

.summary-detail-answers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin: 0;
}

.summary-detail-answers > div {
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft-bg);
}

.summary-detail-answers > div.wrong {
  border-color: rgba(255, 138, 138, .72);
  background: color-mix(in srgb, var(--danger) 10%, var(--soft-bg));
}

.summary-detail-answers > div.correct,
.summary-detail-answers > .correct-answer {
  border-color: rgba(142, 240, 177, .62);
  background: color-mix(in srgb, var(--success) 10%, var(--soft-bg));
}

.summary-detail-answers dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 800;
}

.summary-detail-answers dd {
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: 1rem;
  font-weight: 900;
}

.empty-detail {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.summary-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.footer {
  margin-top: auto;
  padding-top: 24px;
  text-align: center;
  color: var(--muted);
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.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;
}

[hidden] {
  display: none !important;
}

@media (max-width: 920px) {
  .question-main,
  .typing-form {
    grid-template-columns: 1fr;
  }

  .controls,
  .progress-head {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .choices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .reference-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .version-badge {
    top: max(8px, env(safe-area-inset-top));
    right: max(8px, env(safe-area-inset-right));
    font-size: .76rem;
  }

  .top-page-link {
    top: max(8px, env(safe-area-inset-top));
    left: max(8px, env(safe-area-inset-left));
    padding: 6px 10px;
    font-size: .82rem;
  }

  .app-shell {
    width: min(100% - 16px, 1120px);
    padding-top: max(48px, calc(28px + env(safe-area-inset-top)));
  }

  body:not(.is-quiz-active) .app-shell {
    padding-top: max(68px, calc(54px + env(safe-area-inset-top)));
  }

  body.is-quiz-active .app-shell {
    padding-top: max(6px, env(safe-area-inset-top));
  }

  body.is-quiz-active .panel {
    margin-top: 8px;
  }

  .hero {
    padding-right: 58px;
    margin-top: 8px;
  }

  .lead {
    font-size: .95rem;
  }

  .panel {
    border-radius: 18px;
    padding: 14px;
  }

  .progress-panel {
    position: sticky;
    top: max(6px, env(safe-area-inset-top));
    z-index: 15;
    padding: 8px;
  }

  .progress-topline {
    align-items: center;
    flex-direction: row;
    gap: 8px;
    margin-bottom: 6px;
  }

  .progress-title {
    font-size: .82rem;
    letter-spacing: .02em;
  }

  .retire-btn {
    width: auto;
    min-height: 36px;
    margin-left: auto;
    padding-inline: 10px;
    font-size: .8rem;
  }

  .controls,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .progress-head {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 5px;
  }

  .progress-head > div {
    padding: 6px 4px;
    border-radius: 12px;
  }

  .progress-head .label {
    margin-bottom: 2px;
    font-size: .6rem;
    letter-spacing: .04em;
  }

  .progress-head strong {
    font-size: 1rem;
  }

  .progress-bar {
    height: 6px;
    margin-top: 6px;
  }

  select,
  input,
  button {
    min-height: 50px;
    font-size: 1rem;
  }

  .quiz-card {
    padding: 12px;
  }

  .question-meta {
    gap: 6px;
    margin-bottom: 8px;
  }

  .question-meta span {
    padding: 4px 8px;
    font-size: .82rem;
  }

  .question-main {
    gap: 8px;
    margin-bottom: 8px;
  }

  .question-block {
    padding: 10px;
    border-radius: 16px;
  }

  .question-block .label {
    margin-bottom: 4px;
    font-size: .76rem;
    letter-spacing: .05em;
  }

  .question-block strong {
    font-size: 2.05rem;
  }

  .question-block.accent strong {
    font-size: 1.95rem;
  }

  .question-text {
    margin-bottom: 8px;
    line-height: 1.45;
  }

  .choices,
  .reference-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 7px;
  }

  .choice-btn {
    min-height: 56px;
    padding: 0 8px;
    border-radius: 12px;
    font-size: 1rem;
  }

  .choices[data-choice-count="7"] {
    gap: 6px;
  }

  .choices[data-choice-count="7"] .choice-btn {
    min-height: 52px;
    font-size: .95rem;
  }

  .reference-header {
    align-items: stretch;
    flex-direction: column;
  }

  .ref-cell {
    padding: 8px 6px;
  }

  .summary-actions button {
    width: 100%;
  }

  .summary-detail-head,
  .summary-detail-answers,
  .summary-question-grid {
    grid-template-columns: 1fr;
  }

  .summary-detail-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .result-overlay {
    padding: 12px;
  }

  .overlay-card,
  .countdown-card {
    border-radius: 20px;
  }
}

@media (max-width: 560px) and (max-height: 700px) {
  .progress-panel {
    position: static;
  }
}

@media (orientation: landscape) and (max-height: 560px) {
  .app-shell {
    width: min(100% - 16px, 1120px);
    padding-top: max(4px, env(safe-area-inset-top));
    padding-bottom: max(8px, env(safe-area-inset-bottom));
  }

  body.is-quiz-active .panel {
    margin-top: 6px;
  }

  .panel {
    border-radius: 16px;
  }

  .quiz-layout.is-countdown {
    min-height: 250px;
  }

  .progress-panel {
    position: static;
    padding: 6px 8px;
  }

  .progress-topline {
    align-items: center;
    gap: 8px;
    margin-bottom: 5px;
  }

  .progress-title {
    font-size: .76rem;
    letter-spacing: 0;
  }

  .retire-btn {
    min-height: 30px;
    padding-inline: 8px;
    border-radius: 10px;
    font-size: .72rem;
  }

  .progress-head {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 5px;
  }

  .progress-head > div {
    padding: 5px 4px;
    border-radius: 10px;
  }

  .progress-head .label {
    margin-bottom: 1px;
    font-size: .56rem;
    letter-spacing: .03em;
  }

  .progress-head strong {
    font-size: .95rem;
  }

  .progress-bar {
    height: 4px;
    margin-top: 5px;
  }

  .quiz-card {
    display: grid;
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    grid-template-areas:
      "meta choices"
      "main choices"
      "text choices";
    gap: 8px 10px;
    padding: 10px;
  }

  .question-meta {
    grid-area: meta;
    gap: 5px;
    margin-bottom: 0;
  }

  .question-meta span {
    padding: 3px 7px;
    font-size: .76rem;
  }

  .question-main {
    grid-area: main;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
    margin-bottom: 0;
  }

  .question-block {
    padding: 8px;
    border-radius: 14px;
  }

  .question-block .label {
    margin-bottom: 3px;
    font-size: .68rem;
    letter-spacing: .04em;
  }

  .question-block strong {
    font-size: 1.75rem;
  }

  .question-block.accent strong {
    font-size: 1.55rem;
  }

  .question-text {
    grid-area: text;
    margin-bottom: 0;
    font-size: .84rem;
    line-height: 1.35;
  }

  .choices {
    grid-area: choices;
    align-self: stretch;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .choice-btn {
    min-height: 46px;
    padding: 0 6px;
    border-radius: 11px;
    font-size: .94rem;
  }

  .choices[data-choice-count="7"] .choice-btn {
    min-height: 42px;
    font-size: .9rem;
  }

  .reference-panel {
    padding: 10px;
  }

  .reference-header {
    align-items: center;
    flex-direction: row;
  }

  .reference-header p {
    display: none;
  }
}

@media (hover: none) and (pointer: coarse) {
  button:hover:not(:disabled) {
    filter: none;
  }

  .choice-btn {
    min-height: 60px;
  }
}