:root {
  --bg: #f5f6f8;
  --panel-bg: #ffffff;
  --text: #1a1d23;
  --muted: #6b7280;
  --border: #e2e5ea;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --yes: #16a34a;
  --no: #dc2626;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --panel-bg: #1f2229;
    --text: #eef0f3;
    --muted: #9aa1ac;
    --border: #2c3038;
    --accent: #3b82f6;
    --accent-text: #ffffff;
    --yes: #22c55e;
    --no: #ef4444;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

.hidden { display: none !important; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  padding: calc(1rem + env(safe-area-inset-top)) calc(1.25rem + env(safe-area-inset-right)) 1rem calc(1.25rem + env(safe-area-inset-left));
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  margin: 0;
  font-size: 1.15rem;
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.25rem calc(1.25rem + env(safe-area-inset-right)) calc(1.25rem + env(safe-area-inset-bottom)) calc(1.25rem + env(safe-area-inset-left));
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 0.6rem;
  font-size: 1rem;
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.panel-header-row h2 { margin: 0; }

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.stat-tile {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.7rem 0.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-tile .value {
  font-size: 1.3rem;
  font-weight: 700;
}

.stat-tile .label {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.category-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.category-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.4rem 1rem;
}

.category-list label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
}

.mode-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.mode-option {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  cursor: pointer;
}

.mode-option input { margin-top: 0.25rem; }

.mode-option span { display: flex; flex-direction: column; }
.mode-option small { color: var(--muted); }

.primary-btn {
  display: block;
  width: 100%;
  padding: 0.85rem 1rem;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 1rem;
}

.primary-btn:active { opacity: 0.85; }

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
}

.link-btn.danger { color: var(--no); }

.progress-breakdown {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.progress-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.progress-row .row-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}

.progress-row .row-label small { color: var(--muted); }

.progress-bar {
  height: 8px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
  display: flex;
}

.progress-bar .seg-mastered { background: var(--yes); height: 100%; }
.progress-bar .seg-active { background: var(--accent); height: 100%; }

.session-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.card {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.card-category {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.box-level {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.box-level small {
  color: var(--muted);
  font-size: 0.75rem;
}

.box-dots {
  display: inline-flex;
  gap: 0.3rem;
}

.box-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  display: inline-block;
}

.box-dot.filled { background: var(--yes); }

.card-danish {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  word-break: break-word;
}

.card-answer {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
  min-height: 1.4rem;
}

.card-answer.concealed { visibility: hidden; }

.answer-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.answer-btn {
  padding: 0.9rem 0.5rem;
  border-radius: 10px;
  border: none;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  color: #fff;
}

.yes-btn { background: var(--yes); }
.no-btn { background: var(--no); }

.round-card p {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem 0.75rem;
}

.match-column {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.match-item {
  font: inherit;
  background: var(--panel-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 0.6rem;
  font-size: 0.95rem;
  text-align: center;
  box-shadow: var(--shadow);
  cursor: pointer;
  word-break: break-word;
}

.match-item.selected { border-color: var(--accent); border-width: 2px; }

.match-item.matched {
  border-color: var(--yes);
  color: var(--yes);
  cursor: default;
  opacity: 0.65;
}

.match-item.wrong {
  border-color: var(--no);
  color: var(--no);
  border-width: 2px;
  animation: match-shake 0.4s ease;
}

@keyframes match-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

@media (max-width: 420px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .card-danish { font-size: 1.6rem; }
  .match-item { padding: 0.6rem 0.4rem; font-size: 0.85rem; }
}