:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #666;
  --border: #e0e0e0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #4b5563;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --guess-bg: #f3f4f6;
  --guess-text: #6b7280;
  --maybe-bg: #fef3c7;
  --maybe-text: #92400e;
  --certain-bg: #dcfce7;
  --certain-text: #166534;
  --consensus-bg: #eff6ff;
  --correct-bg: #dcfce7;
  --incorrect-bg: #fee2e2;
}

/* Dark theme: blue-grey tones */
[data-theme="dark"] {
  --bg: #141820;
  --surface: #222936;
  --text: #d8dce4;
  --text-muted: #8892a0;
  --border: #3a4358;
  --primary: #5b9cf5;
  --primary-hover: #4888e0;
  --secondary: #41679d;
  --guess-bg: #2c3340;
  --guess-text: #8892a0;
  --maybe-bg: #3a3828;
  --maybe-text: #d4b560;
  --certain-bg: #253828;
  --certain-text: #6cc070;
  --consensus-bg: #242e40;
  --correct-bg: #253828;
  --incorrect-bg: #3e2428;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

input, select, textarea {
  background: var(--surface);
  color: var(--text);
}

/* Layout */
.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-actions button,
.header-actions a {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
  cursor: pointer;
}

.header-actions button:hover,
.header-actions a:hover {
  background: var(--bg);
}

/* Split pane (desktop) */
.split-pane {
  display: flex;
  height: calc(100vh - 49px);
}

.image-pane {
  width: 40%;
  min-width: 300px;
  max-width: 500px;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: 1rem;
  position: sticky;
  top: 49px;
  height: calc(100vh - 49px);
}

.image-pane img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  cursor: zoom-in;
}

.image-pane img.zoomed {
  cursor: zoom-out;
  width: auto;
  max-width: none;
}

.answer-toggle-btn {
  width: 100%;
  padding: 0.6rem;
  margin: 1.5rem 0;
  background: var(--danger);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.answer-toggle-btn:hover {
  opacity: 0.85;
}

.quiz-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.image-pane .image-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 1rem 0 0.5rem;
}

.image-pane .quiz-title + .image-label {
  margin-top: 0;
}

.answers-pane {
  flex: 1;
  overflow: auto;
  padding: 1rem;
  height: calc(100vh - 49px);
}

/* Score bar */
.score-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}

.score-bar .score {
  font-size: 1.5rem;
  color: var(--primary);
}

/* Answer grid table */
.answer-grid {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  table-layout: fixed;
  font-size: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
}

.answer-grid thead {
  position: sticky;
  top: 0;
  z-index: 10;
}

.answer-grid th {
  background: color-mix(in srgb, var(--primary) 19%, var(--bg));
  color: var(--secondary);
  border-bottom: 2px solid var(--border);
  border-left: 1px solid var(--border);
  padding: 0.5rem 0.6rem;
  text-align: left;
  font-weight: 700;
  font-size: 0.8rem;
  white-space: nowrap;
}

.answer-grid th:first-child {
  border-left: none;
}

.answer-grid td {
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  padding: 0.35rem 0.5rem;
  vertical-align: middle;
}

.answer-grid td:first-child {
  border-left: none;
}

.answer-grid tr:last-child td {
  border-bottom: none;
}

.col-participant.col-even {
  background: color-mix(in srgb, var(--bg) 55%, var(--surface));
}

th.col-participant.col-even {
  background: color-mix(in srgb, var(--primary) 12%, var(--bg));
  color: var(--secondary);
}

.answer-grid tr:hover td {
  background: color-mix(in srgb, var(--bg) 50%, var(--surface));
}

th.col-q {
  text-align: center;
}

.col-q {
  width: 3rem;
  text-align: center;
  font-weight: 700;
  color: var(--text-muted);
}

.col-participant {
  overflow: hidden;
  text-overflow: ellipsis;
}

.col-me {
  background: color-mix(in srgb, var(--primary) 5%, var(--surface));
}

th.col-me {
  background: color-mix(in srgb, var(--primary) 25%, var(--surface));
  color: var(--primary);
}

.col-consensus {
  min-width: 140px;
  background: color-mix(in srgb, var(--primary) 5%, var(--surface));
}

th.col-consensus {
  background: color-mix(in srgb, var(--primary) 12%, var(--bg));
  color: var(--success);
}

.col-consensus.correct {
  background: var(--correct-bg);
}

.col-consensus.incorrect {
  background: var(--incorrect-bg);
}

/* Cell contents */
.cell-answer {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.cell-text {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cell-empty {
  color: var(--text-muted);
}

.cell-input {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.cell-input input {
  flex: 1;
  min-width: 80px;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.85rem;
}

.save-all-btn {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.save-all-btn:hover {
  background: var(--primary-hover);
}

/* Consensus cell */
.consensus-cell {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.consensus-cell.correct {
  background: var(--correct-bg);
}

.consensus-cell.incorrect {
  background: var(--incorrect-bg);
}

.consensus-input {
  flex: 1;
  min-width: 0;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.85rem;
}

.mark-buttons {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.mark-btn {
  padding: 0.15rem 0.35rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.7rem;
}

.mark-btn.correct-active {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.mark-btn.incorrect-active {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.confidence-badge {
  padding: 0.1rem 0.4rem;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  white-space: nowrap;
}

.confidence-guess {
  background: var(--guess-bg);
  color: var(--guess-text);
}

.confidence-maybe {
  background: var(--maybe-bg);
  color: var(--maybe-text);
}

.confidence-certain {
  background: var(--certain-bg);
  color: var(--certain-text);
}

.confidence-select {
  padding: 0.15rem 0.3rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  cursor: pointer;
}

.confidence-select.conf-guess {
  background: var(--guess-bg);
  color: var(--guess-text);
}

.confidence-select.conf-maybe {
  background: var(--maybe-bg);
  color: var(--maybe-text);
}

.confidence-select.conf-certain {
  background: var(--certain-bg);
  color: var(--certain-text);
}

.confidence-select:focus {
  background: var(--surface);
  color: var(--text);
}

.vote-controls {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  white-space: nowrap;
}

.vote-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.1rem;
  color: var(--text-muted);
  line-height: 1;
}

.vote-btn:hover {
  color: var(--text);
}

.vote-btn.active-up {
  color: var(--success);
}

.vote-btn.active-down {
  color: var(--danger);
}

.vote-score {
  font-size: 0.8rem;
  font-weight: 600;
  min-width: 1.5em;
  text-align: center;
}


/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: var(--surface);
  border-radius: 12px;
  padding: 2rem;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal h2 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.modal input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.modal button {
  width: 100%;
  padding: 0.6rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
}

.modal button:hover {
  background: var(--primary-hover);
}

.modal .error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

/* Admin panel */
.admin-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.admin-panel h3 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.admin-panel input[type="text"],
.admin-panel input[type="password"],
.admin-panel input[type="file"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.admin-panel button {
  padding: 0.4rem 0.8rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
}

.admin-panel button:hover {
  background: var(--primary-hover);
}

.admin-panel .admin-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}

/* No quiz state */
.no-quiz {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.no-quiz h2 {
  margin-bottom: 0.5rem;
  color: var(--text);
}


/* Toast notifications */
.toast {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-size: 0.9rem;
  z-index: 2000;
  animation: fadeIn 0.2s ease;
}

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

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

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Mobile: collapsible image panel */
.mobile-image-toggle {
  display: none;
  width: 100%;
  padding: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}

/* Legend */
.legend {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.4rem 0.6rem;
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.legend-vote {
  font-size: 0.85rem;
}

/* Mobile column slider */
.mobile-slider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
}

.slider-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text);
}

.slider-btn:hover {
  background: var(--border);
}

.slider-label {
  font-weight: 600;
  font-size: 0.9rem;
  min-width: 80px;
  text-align: center;
}

@media (max-width: 768px) {
  .split-pane {
    flex-direction: column;
    height: auto;
  }

  .image-pane {
    width: 100%;
    max-width: none;
    min-width: auto;
    position: relative;
    top: auto;
    height: auto;
    max-height: 50vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .image-pane.collapsed {
    display: none;
  }

  .mobile-image-toggle {
    display: block;
  }

  .answers-pane {
    height: auto;
    padding: 0.5rem;
    overflow-x: auto;
  }

  .answer-grid {
    font-size: 0.75rem;
  }

  .col-participant {
    min-width: 90px;
  }

  .col-consensus {
    min-width: 100px;
  }
}

/* Archive page */
.archive-list {
  max-width: 600px;
  margin: 1rem auto;
  padding: 0 1rem;
}

.archive-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  color: var(--text);
}

.archive-item:hover {
  border-color: var(--primary);
}

.archive-item .quiz-title {
  font-weight: 600;
}

.archive-item .quiz-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.archive-item .quiz-score {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.archive-item .quiz-score.locked {
  color: var(--success);
}

/* Locked banner */
.locked-banner {
  background: var(--warning);
  color: white;
  padding: 0.5rem 1rem;
  text-align: center;
  font-weight: 600;
  font-size: 0.85rem;
}