:root {
  --ink: #211f1c;
  --ink-soft: #58534b;
  --paper: #faf7f2;
  --paper-raised: #ffffff;
  --line: #e3ddd2;
  --accent: #a3402f;
  --accent-soft: #f1ddd6;
  --good: #3f7d5c;
  --good-soft: #e1efe6;
  --bad: #a3402f;
  --bad-soft: #f6e2de;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(33, 31, 28, 0.06), 0 1px 2px rgba(33, 31, 28, 0.08);
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3 { font-family: var(--font-display); margin: 0; }

/* Header */
.site-header {
  padding: 2.25rem 1.5rem 0;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}
.site-header__inner { margin-bottom: 1.5rem; }
.site-title {
  font-size: 2.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.site-title__accent { color: var(--accent); }
.site-subtitle {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
  font-size: 1rem;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  border-bottom: 1px solid var(--line);
}
.tab-btn {
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.7rem 1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  transform: translateY(1px);
}
.tab-btn:hover:not(:disabled) { color: var(--ink); }
.tab-btn.is-active {
  color: var(--ink);
  border-bottom-color: var(--accent);
  font-weight: 600;
}
.tab-btn:disabled { color: #c9c2b4; cursor: not-allowed; }
.tab-btn--ghost { margin-left: auto; }
.soon {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  margin-left: 0.3rem;
  vertical-align: middle;
}

/* Main / views */
main#app {
  flex: 1;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
  padding: 1.75rem 1.5rem 4rem;
}
.view { display: none; }
.view.is-active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.panel {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}
.panel h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.panel--row {
  display: flex;
  gap: 2rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: space-between;
}
.hint {
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin: 0 0 1rem;
}

/* Chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-size: 0.87rem;
  cursor: pointer;
  user-select: none;
  transition: border-color 0.15s, background 0.15s;
}
.chip:has(input:checked) {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}
.chip input { accent-color: var(--accent); }
.chip-actions { margin-top: 0.75rem; display: flex; gap: 1rem; }
.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}
.link-btn:hover { text-decoration: underline; }

/* Mode cards */
.mode-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }
.mode-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  cursor: pointer;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  transition: border-color 0.15s, background 0.15s;
}
.mode-card:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.mode-card input { margin-top: 0.25rem; accent-color: var(--accent); }
.mode-card__body { display: flex; flex-direction: column; gap: 0.2rem; }
.mode-card__body strong { font-size: 0.95rem; }
.mode-card__body span { font-size: 0.8rem; color: var(--ink-soft); line-height: 1.35; }

/* Length row */
.length-row { display: flex; align-items: center; gap: 0.75rem; margin: 0.5rem 0; }
.length-row input[type="range"] { accent-color: var(--accent); width: 220px; }
#lengthValue { font-weight: 600; font-size: 0.9rem; min-width: 5.5rem; }
.checkbox-inline { font-size: 0.87rem; color: var(--ink-soft); display: flex; gap: 0.4rem; align-items: center; }
.checkbox-inline input { accent-color: var(--accent); }

.setup-summary {
  font-size: 0.85rem;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  min-width: 220px;
  line-height: 1.5;
}
.setup-summary strong { color: var(--ink); }

.start-row { display: flex; align-items: center; gap: 1rem; margin-top: 0.5rem; }
.start-warning { color: var(--accent); font-size: 0.85rem; }

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: #3a3630; }
.btn--primary:disabled { background: #cfc9bc; cursor: not-allowed; }
.btn--ghost { background: none; border-color: var(--line); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); }

/* Practice view */
.practice-topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.progress-track {
  flex: 1;
  height: 6px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill { height: 100%; background: var(--accent); width: 0%; transition: width 0.3s ease; }
.score-pill {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.card-stage {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
  perspective: 1600px;
}

.art-card {
  width: 100%;
  max-width: 560px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.art-card__image-wrap {
  background: #1c1a17;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  max-height: 460px;
  overflow: hidden;
}
.art-card__image-wrap img {
  width: 100%;
  height: 100%;
  max-height: 460px;
  object-fit: contain;
}
.art-card__image-wrap.no-image {
  color: #8a8478;
  font-size: 0.9rem;
  padding: 2rem;
  text-align: center;
}
.art-card__body { padding: 1.25rem 1.4rem 1.5rem; }
.art-card__question {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.art-card__answer-block {
  border-top: 1px dashed var(--line);
  margin-top: 1rem;
  padding-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.art-card__answer-row {
  font-size: 0.95rem;
}
.art-card__answer-row .label {
  color: var(--ink-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 0.5rem;
}

/* Why it matters (significance fact) */
.funfact-slot:not(:empty) { margin-top: 1rem; }
.funfact-block {
  background: linear-gradient(135deg, #fbf3e3, #f6ecd8);
  border: 1px solid #e8d9b5;
  border-radius: 10px;
  padding: 0.85rem 1rem;
}
.funfact-block__label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: #8a6d1f;
  margin-bottom: 0.35rem;
}
.funfact-block__text {
  font-size: 0.9rem;
  color: #4a3f24;
  line-height: 1.55;
  margin: 0;
}
.browse-card .funfact-block { margin: 0.6rem 0 0; padding: 0.6rem 0.75rem; border-radius: 8px; }
.browse-card .funfact-block__label { font-size: 0.66rem; }
.browse-card .funfact-block__text { font-size: 0.78rem; }

/* Provenance / ownership history */
.provenance-slot:not(:empty) { margin-top: 0.9rem; }
.provenance-details {
  border-top: 1px dashed var(--line);
  padding-top: 0.7rem;
}
.provenance-details summary {
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
}
.provenance-details summary::-webkit-details-marker { display: none; }
.provenance-details summary::before {
  content: "\25B8";
  display: inline-block;
  margin-right: 0.4rem;
  transition: transform 0.15s;
}
.provenance-details[open] summary::before { transform: rotate(90deg); }
.provenance-text {
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.55;
  margin: 0.5rem 0 0;
}
.provenance-text a { color: var(--accent); }
.browse-card .provenance-details { padding: 0.5rem 0.75rem 0.6rem; border-top: none; }
.browse-card .provenance-details summary { font-size: 0.75rem; }
.browse-card .provenance-text { font-size: 0.78rem; }

/* Practice controls */
.practice-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}
.reveal-btn, .grade-row, .mc-options, .type-row {
  width: 100%;
  max-width: 560px;
}
.reveal-btn { text-align: center; }
.grade-row {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
}
.grade-btn {
  flex: 1;
  padding: 0.7rem 0.5rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
}
.grade-btn--again { color: var(--bad); }
.grade-btn--again:hover { background: var(--bad-soft); border-color: var(--bad); }
.grade-btn--good { color: var(--good); }
.grade-btn--good:hover { background: var(--good-soft); border-color: var(--good); }

.mc-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}
.mc-option {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  cursor: pointer;
  text-align: left;
  font-size: 0.92rem;
}
.mc-option:hover { border-color: var(--ink); }
.mc-option.is-correct { background: var(--good-soft); border-color: var(--good); color: var(--good); font-weight: 600; }
.mc-option.is-wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); font-weight: 600; }
.mc-option:disabled { cursor: default; }

.type-row {
  display: flex;
  gap: 0.6rem;
}
.type-row input {
  flex: 1;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  font-size: 0.95rem;
  font-family: var(--font-body);
}
.type-row input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.type-feedback {
  max-width: 560px;
  width: 100%;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem;
  border-radius: 10px;
}
.type-feedback.correct { color: var(--good); background: var(--good-soft); }
.type-feedback.incorrect { color: var(--bad); background: var(--bad-soft); }

.next-btn { align-self: center; }

.post-answer-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
}
.learn-more-btn {
  text-decoration: none;
  padding: 0.65rem 1.1rem;
  font-size: 0.88rem;
}

/* Summary */
.summary-panel { text-align: center; padding: 2.5rem 1.6rem; }
.summary-score { font-size: 1.4rem; font-weight: 600; margin: 0.5rem 0 1.5rem; }
.missed-list {
  text-align: left;
  max-width: 480px;
  margin: 0 auto 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.missed-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.4rem;
}
.missed-item .m-answer { color: var(--ink-soft); }

/* Browse */
.browse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}
.browse-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--paper-raised);
}
.browse-card__img {
  height: 140px;
  background: #1c1a17;
  display: flex;
  align-items: center;
  justify-content: center;
}
.browse-card__img img { width: 100%; height: 100%; object-fit: contain; }
.browse-card__body { padding: 0.6rem 0.75rem 0.8rem; }
.browse-card__title { font-size: 0.85rem; font-weight: 600; line-height: 1.3; margin-bottom: 0.15rem; }
.browse-card__meta { font-size: 0.75rem; color: var(--ink-soft); }

.compete-panel { text-align: center; padding: 3rem 1.6rem; color: var(--ink-soft); }

/* Segmented control (study source) */
.segmented { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.segmented__btn {
  font-family: var(--font-body);
  font-size: 0.87rem;
  font-weight: 600;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
}
.segmented__btn:hover { border-color: var(--ink); color: var(--ink); }
.segmented__btn.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
#movementPanel.is-disabled { opacity: 0.45; pointer-events: none; }

/* Favorite / practice-later toggles on cards */
.bookmark-row {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  display: flex;
  gap: 0.4rem;
  z-index: 2;
}
.bookmark-btn {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  border: none;
  background: rgba(28, 26, 23, 0.55);
  color: #cfc9bc;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, background 0.15s, color 0.15s;
}
.bookmark-btn:hover { transform: scale(1.08); }
.bookmark-btn.is-active-fav { color: #f2c14e; background: rgba(28, 26, 23, 0.75); }
.bookmark-btn.is-active-later { color: #7fb3d5; background: rgba(28, 26, 23, 0.75); }

.art-card__image-wrap { position: relative; }
.browse-card__img { position: relative; }

/* Browse filter row */
.browse-filter-row { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.filter-chip {
  font-family: var(--font-body);
  font-size: 0.83rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
}
.filter-chip:hover { border-color: var(--ink); }
.filter-chip.is-active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

/* Bug report FAB + modal */
.bug-fab {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  font-size: 1.4rem;
  cursor: pointer;
  filter: grayscale(1) opacity(0.55);
  transition: filter 0.15s, transform 0.15s;
  box-shadow: var(--shadow);
  z-index: 50;
}
.bug-fab:hover { filter: grayscale(0) opacity(1); transform: scale(1.06); }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 18, 15, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}
.modal-overlay[hidden] { display: none; }
.modal {
  background: var(--paper-raised);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 440px;
  width: 100%;
  box-shadow: var(--shadow);
}
.modal h3 { font-size: 1.15rem; margin-bottom: 1rem; }
.bug-type-row { display: flex; gap: 1.25rem; margin-bottom: 1rem; font-size: 0.88rem; }
.radio-inline { display: flex; align-items: center; gap: 0.4rem; cursor: pointer; }
.radio-inline input { accent-color: var(--accent); }
.bug-card-info {
  background: var(--paper);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.9rem;
  line-height: 1.5;
}
.bug-card-info strong { color: var(--ink); }
.bug-label { display: block; font-size: 0.82rem; font-weight: 600; margin-bottom: 0.4rem; }
.modal textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: 0.9rem;
  resize: vertical;
}
.modal textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.bug-hint { font-size: 0.8rem; color: var(--ink-soft); min-height: 1.1em; margin: 0.5rem 0 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 0.6rem; margin-top: 1rem; }

.site-footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding: 1.5rem;
}
.site-footer code { background: var(--line); padding: 0.1rem 0.35rem; border-radius: 4px; }

@media (max-width: 640px) {
  .mode-cards { grid-template-columns: 1fr; }
  .mc-options { grid-template-columns: 1fr; }
  .panel--row { flex-direction: column; align-items: stretch; }
}