:root {
  --bg: #f4f1ea;
  --card: #fffaf2;
  --ink: #1f2933;
  --muted: #697386;
  --line: #ded6c8;
  --accent: #1d6f63;
  --accent-dark: #12483f;
  --danger: #a73535;
  --danger-bg: #f8e7e7;
  --success: #20724e;
  --success-bg: #e3f4ec;
  --warning-bg: #fff2cc;
  --shadow: 0 16px 50px rgba(31, 41, 51, 0.10);
  --page-x: clamp(18px, 4vw, 56px);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top left, #fff8e6 0, var(--bg) 38%, #ece7dc 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}

button, select, input { font: inherit; }

button, select, .option-btn {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

button, select {
  min-height: 44px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  padding: 32px var(--page-x) 18px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.2rem);
  letter-spacing: -0.06em;
  line-height: 0.95;
}

.header-actions, .nav-row { display: flex; gap: 10px; flex-wrap: wrap; }

.layout {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: 18px;
  padding: 0 var(--page-x) 32px;
  align-items: start;
}

.card {
  background: rgba(255, 250, 242, 0.92);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.controls {
  position: sticky;
  top: 18px;
  padding: 0;
  display: block;
  overflow: hidden;
}

.controls details {
  width: 100%;
}

.controls-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  justify-content: stretch;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.controls-summary::-webkit-details-marker { display: none; }

.summary-arrow {
  display: inline-block;
  color: var(--accent-dark);
  font-weight: 900;
  transition: transform .16s ease;
}

.controls details[open] .summary-arrow {
  transform: rotate(180deg);
}

.summary-title {
  font-weight: 900;
  color: var(--ink);
}

.summary-stats {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  min-width: 0;
}

.summary-stats span {
  white-space: nowrap;
}

.summary-actions {
  display: inline-flex;
  gap: 8px;
  align-items: center;
}

.summary-btn {
  min-height: 36px;
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 0.82rem;
}

.controls-content {
  padding: 0 18px 18px;
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
  font-weight: 750;
  color: #39424e;
}

select {
  width: 100%;
  border: 1px solid var(--line);
  background: white;
  border-radius: 14px;
  padding: 11px 12px;
  color: var(--ink);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}

.checkbox-row input { width: 18px; height: 18px; accent-color: var(--accent); }

.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.score-grid div {
  background: white;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
}

.score-grid span {
  display: block;
  font-size: 1.45rem;
  font-weight: 850;
  letter-spacing: -0.04em;
}

.score-grid small {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 800;
}

.language-scores {
  display: grid;
  gap: 9px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.language-scores h2 {
  margin: 0 0 2px;
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.language-scores div {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  background: white;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 12px;
}

.language-scores strong { font-size: 0.9rem; }
.language-scores span { color: var(--accent-dark); font-weight: 850; }

.quiz { padding: clamp(18px, 3vw, 34px); min-height: 620px; }

.loading, .empty { color: var(--muted); padding: 32px; text-align: center; }

.question-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  margin-bottom: 8px;
}

.question-meta > span:not(.pill)::after {
  content: "·";
  margin-left: 6px;
  color: #b2aa9d;
}

.question-meta > span:last-of-type::after,
.question-meta > .pill::after {
  content: none;
}

.question-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 360px);
  gap: 24px;
  align-items: start;
}

.question-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: #efe8dc;
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 900;
  padding: 7px 10px;
}

button.small {
  padding: 8px 11px;
  border-radius: 999px;
  font-size: 0.86rem;
}

.question-text {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 3.2vw, 3rem);
  line-height: 1.06;
  letter-spacing: -0.045em;
}

.question-text.ca {
  color: var(--accent-dark);
  font-size: clamp(1.25rem, 2.3vw, 2.1rem);
}

.question-copy {
  display: flex;
  flex-direction: column;
}

body[data-language-mode="both"] .question-text.ca {
  order: 1;
  color: var(--ink);
  font-size: clamp(1.55rem, 3.2vw, 3rem);
}

body[data-language-mode="both"] .question-text:not(.ca) {
  order: 2;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.35rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 650;
}

.asset {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
}

.asset img {
  width: 100%;
  display: block;
  object-fit: contain;
  max-height: 290px;
  background: #f8f8f8;
}

.asset figcaption {
  color: var(--muted);
  font-size: 0.84rem;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
}

.options {
  display: grid;
  gap: 12px;
  margin: 26px 0 20px;
}

.option-btn {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
  border-radius: 18px;
  padding: 16px 18px;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  transition: transform .12s ease, border .12s ease, background .12s ease;
}

@media (hover: hover) and (pointer: fine) {
  .option-btn:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--accent); }
}
@media (hover: none), (pointer: coarse) {
  button:hover,
  button.ghost:hover,
  .option-btn:hover,
  .option-btn:hover:not(:disabled) {
    transform: none;
  }

  .option-btn:hover,
  .option-btn:hover:not(:disabled) {
    border-color: var(--line);
    background: white;
    color: var(--ink);
  }
}
.option-btn:focus:not(:focus-visible) { outline: none; }
.option-btn:disabled { cursor: default; }

.option-letter {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: #efe8dc;
  font-weight: 900;
}

.option-main { display: grid; gap: 5px; }
.option-en { font-weight: 800; }
.option-ca { color: var(--accent-dark); }

body[data-language-mode="both"] .option-ca {
  order: 1;
  color: var(--ink);
  font-weight: 850;
}

body[data-language-mode="both"] .option-en {
  order: 2;
  color: var(--muted);
  font-size: 0.92em;
  font-weight: 620;
}

.option-btn.correct {
  border-color: var(--success);
  background: var(--success-bg);
}
.option-btn.incorrect {
  border-color: var(--danger);
  background: var(--danger-bg);
}
.option-btn.dimmed { opacity: 0.65; }

.feedback {
  border-radius: 18px;
  padding: 15px 16px;
  font-weight: 800;
  margin-bottom: 14px;
}
.feedback.correct { background: var(--success-bg); color: var(--success); }
.feedback.incorrect { background: var(--danger-bg); color: var(--danger); }
.feedback.note { background: var(--warning-bg); color: #7a5a00; }

.explanation {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: white;
  padding: 14px 16px;
  margin: 14px 0 20px;
}

.explanation summary { cursor: pointer; font-weight: 850; }
.explanation div { color: #414b57; margin-top: 12px; line-height: 1.55; }
.explanation-block + .explanation-block { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); }
.explanation-block h4 { margin: 0 0 6px; color: var(--accent-dark); font-size: 0.86rem; text-transform: uppercase; letter-spacing: 0.05em; }
.explanation-block p { margin: 0; }

body[data-language-mode="both"] .explanation-block:first-child p {
  color: var(--ink);
  font-weight: 650;
}

body[data-language-mode="both"] .explanation-block:nth-child(2) p {
  color: var(--muted);
  font-size: 0.94em;
}

button {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  color: white;
  background: var(--accent);
  font-weight: 850;
  cursor: pointer;
}
@media (hover: hover) and (pointer: fine) {
  button:hover { background: var(--accent-dark); }
  button.ghost:hover { border-color: var(--accent); color: var(--accent-dark); }
}
button.ghost {
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
  color: var(--ink);
}
button.danger { color: var(--danger); }
button:disabled { opacity: .45; cursor: not-allowed; }

.nav-row { justify-content: space-between; margin-top: 22px; }

.hidden { display: none !important; }

.toast {
  position: fixed;
  left: 50%;
  top: max(14px, env(safe-area-inset-top));
  z-index: 50;
  transform: translate(-50%, -14px) scale(0.98);
  opacity: 0;
  pointer-events: none;
  border-radius: 999px;
  padding: 11px 16px;
  box-shadow: 0 12px 34px rgba(31, 41, 51, 0.22);
  font-weight: 900;
  transition: opacity .18s ease, transform .18s ease;
}

.toast.success {
  background: var(--success);
  color: white;
}

.toast.visible {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

.footer {
  padding: 0 var(--page-x) 28px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 850px) {
  .app-header { flex-direction: column; }
  .layout { grid-template-columns: 1fr; }
  .controls { position: static; }
  .question-body { grid-template-columns: 1fr; }
  .quiz { min-height: auto; }
}

@media (max-width: 640px) {
  :root {
    --page-x: 10px;
    --shadow: 0 8px 24px rgba(31, 41, 51, 0.08);
  }

  body {
    background: var(--bg);
  }

  .app-header {
    gap: 10px;
    padding-top: max(10px, env(safe-area-inset-top));
    padding-bottom: 8px;
  }

  .eyebrow {
    font-size: 0.62rem;
    letter-spacing: 0.045em;
    margin-bottom: 4px;
  }

  h1 {
    font-size: clamp(1.55rem, 8.2vw, 2.15rem);
    max-width: none;
    letter-spacing: -0.05em;
  }

  .header-actions {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .header-actions button {
    width: 100%;
    min-height: 42px;
    padding: 9px 12px;
  }

  .layout {
    gap: 10px;
    padding-bottom: calc(96px + env(safe-area-inset-bottom));
  }

  .card {
    border-radius: 18px;
  }

  .controls {
    padding: 0;
    display: block;
  }

  .controls-summary {
    grid-template-columns: minmax(0, 1fr) auto auto;
    padding: 8px 9px;
    min-height: 44px;
    gap: 6px;
  }

  .summary-title {
    min-width: 0;
    font-size: 0.76rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .summary-stats {
    display: grid;
    justify-items: end;
    gap: 1px;
    font-size: 0.62rem;
    line-height: 1.05;
  }

  .summary-actions {
    gap: 5px;
  }

  .summary-btn {
    min-height: 34px;
    padding: 6px 8px;
    font-size: 0.72rem;
  }

  .controls-content {
    padding: 0 10px 10px;
    gap: 10px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
  }

  .controls-content > label:not(.checkbox-row) {
    min-width: 0;
    font-size: 0.78rem;
    gap: 5px;
  }

  .controls-content > label:nth-of-type(1),
  .controls-content > label:nth-of-type(2) {
    display: grid;
  }

  .checkbox-row {
    grid-column: 1 / -1;
    font-size: 0.86rem;
    gap: 8px;
  }

  .checkbox-row input {
    width: 22px;
    height: 22px;
  }

  select {
    padding: 8px 30px 8px 9px;
    font-size: 0.86rem;
    min-height: 40px;
    border-radius: 12px;
  }

  .score-grid {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }

  .score-grid div {
    padding: 8px 6px;
    border-radius: 12px;
    text-align: center;
  }

  .score-grid span {
    font-size: 1rem;
  }

  .score-grid small {
    font-size: 0.58rem;
    letter-spacing: 0.035em;
  }

  .language-scores {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    padding-top: 8px;
  }

  .language-scores h2 {
    grid-column: 1 / -1;
    font-size: 0.62rem;
    margin: 0;
  }

  .language-scores div {
    display: grid;
    justify-content: stretch;
    text-align: center;
    gap: 2px;
    padding: 7px 4px;
    border-radius: 11px;
    font-size: 0.72rem;
  }

  .language-scores strong {
    font-size: 0.7rem;
  }

  .language-scores span {
    white-space: nowrap;
    font-size: 0.7rem;
  }

  .quiz {
    padding: 13px;
    border-radius: 18px;
  }

  .question-meta {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 6px;
    font-size: 0.68rem;
    line-height: 1.1;
  }

  .question-body {
    gap: 12px;
  }

  .question-tools {
    gap: 8px;
    margin-bottom: 10px;
  }

  .pill {
    font-size: 0.72rem;
    padding: 6px 9px;
  }

  button.small {
    font-size: 0.78rem;
    padding: 7px 10px;
    min-height: 38px;
  }

  .question-text {
    font-size: clamp(1.35rem, 7vw, 2rem);
    line-height: 1.12;
    letter-spacing: -0.035em;
    margin-bottom: 10px;
  }

  .question-text.ca {
    font-size: clamp(1.08rem, 5.6vw, 1.55rem);
  }

  .asset {
    border-radius: 14px;
    max-width: 100%;
  }

  .asset img {
    max-height: min(34vh, 230px);
  }

  .asset figcaption {
    font-size: 0.72rem;
    padding: 7px 9px;
  }

  .options {
    gap: 9px;
    margin: 16px 0 14px;
  }

  .option-btn {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 10px;
    padding: 13px 12px;
    border-radius: 15px;
    min-height: 58px;
  }

  .option-letter {
    width: 30px;
    height: 30px;
    font-size: 0.9rem;
  }

  .option-main {
    gap: 4px;
    min-width: 0;
  }

  .option-en,
  .option-ca {
    overflow-wrap: anywhere;
    line-height: 1.28;
  }

  .option-en { font-size: 0.96rem; }
  .option-ca { font-size: 0.91rem; }

  body[data-language-mode="both"] .question-text.ca {
    font-size: clamp(1.35rem, 7vw, 2rem);
  }

  body[data-language-mode="both"] .question-text:not(.ca) {
    font-size: 0.95rem;
    line-height: 1.3;
  }

  body[data-language-mode="both"] .option-ca {
    font-size: 0.96rem;
  }

  body[data-language-mode="both"] .option-en {
    font-size: 0.86rem;
  }

  .feedback {
    padding: 12px;
    border-radius: 14px;
    font-size: 0.93rem;
  }

  .explanation {
    border-radius: 14px;
    padding: 12px;
    margin-bottom: 14px;
  }

  .explanation div {
    font-size: 0.92rem;
    line-height: 1.48;
  }

  .explanation-block + .explanation-block {
    margin-top: 12px;
    padding-top: 12px;
  }

  .nav-row {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 20;
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 8px;
    margin: 0;
    padding: 10px max(10px, env(safe-area-inset-left)) calc(10px + env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-right));
    background: rgba(244, 241, 234, 0.94);
    border-top: 1px solid var(--line);
    backdrop-filter: blur(12px);
  }

  .nav-row button {
    width: 100%;
    min-height: 50px;
  }

  .footer {
    display: none;
  }
}

@media (max-width: 380px) {
  .score-grid small {
    font-size: 0.52rem;
  }

  .language-scores div {
    font-size: 0.78rem;
  }

  .question-text {
    font-size: clamp(1.22rem, 7vw, 1.65rem);
  }

  .option-btn {
    padding: 12px 10px;
  }
}