:root {
  --bg: #f4f6f2;
  --surface: #ffffff;
  --text: #1f2a1f;
  --muted: #5f6b5f;
  --border: #d9dfd6;
  --accent: #2f7a3e;
  --accent-soft: #e4f2e6;
  --warn: #b7791f;
  --warn-soft: #fbf1dc;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161a16;
    --surface: #212621;
    --text: #e8ece6;
    --muted: #a1aa9f;
    --border: #3a423a;
    --accent: #5fc46f;
    --accent-soft: #223a27;
    --warn: #e0a84c;
    --warn-soft: #3d3220;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1 {
  font-size: 1.15rem;
  margin: 0;
  font-weight: 600;
}

.topbar, .navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.navbar {
  border-bottom: 0;
  border-top: 1px solid var(--border);
  position: sticky;
  bottom: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.score {
  color: var(--muted);
  font-size: 0.9rem;
}

.list-picker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

.list-picker select {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 8px;
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(300px, 2fr);
  gap: 24px;
  padding: 20px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.gallery { min-width: 0; }

.image-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.image-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.image-card:first-child:nth-last-child(odd) {
  grid-column: 1 / -1;
}

.image-card:first-child:nth-last-child(odd) img { aspect-ratio: 2.4 / 1; }

.image-card img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  cursor: zoom-in;
  background: var(--border);
}

.part-label {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.credit {
  font-size: 0.7rem;
  color: var(--muted);
  padding: 5px 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.credit a { color: inherit; }

.empty {
  grid-column: 1 / -1;
  padding: 40px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  align-self: start;
  position: sticky;
  top: 20px;
}

.progress {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 18px;
}

.field { margin-bottom: 22px; }

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-row input {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}

.input-row input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.input-row input.correct {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.input-row input.partial {
  border-color: var(--warn);
  background: var(--warn-soft);
}

.check {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 700;
  flex-shrink: 0;
}

.hint {
  min-height: 1.2em;
  font-size: 0.85rem;
  color: var(--warn);
  margin-top: 4px;
}

.answer {
  margin-top: 4px;
  font-size: 0.95rem;
  color: var(--accent);
  min-height: 1.3em;
}

.botanical-answer { font-style: italic; }

.note {
  font-size: 0.85rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0 0 12px;
}

.note:empty { display: none; }

.tips {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

kbd {
  font: 0.8em ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 5px;
}

.btn {
  font: inherit;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover { border-color: var(--accent); }

.btn:disabled { opacity: 0.4; cursor: default; border-color: var(--border); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-ghost {
  font-size: 0.85rem;
  padding: 6px 12px;
}

.btn-reveal {
  font-size: 0.85rem;
  padding: 8px 12px;
  flex-shrink: 0;
}

.btn-nav { min-width: 140px; }

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  cursor: zoom-out;
  padding: 24px;
}

.lightbox[hidden] { display: none; }

.lightbox img {
  max-width: 100%;
  max-height: calc(100vh - 90px);
  object-fit: contain;
  border-radius: 6px;
}

.lightbox-caption {
  color: #ccc;
  font-size: 0.8rem;
  margin-top: 10px;
}

.lightbox-caption a { color: #fff; }

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 16px;
  }
  .panel { position: static; }
  .image-grid { grid-template-columns: 1fr; }
  .image-card:first-child:nth-last-child(odd) img { aspect-ratio: 4 / 3; }
  .btn-nav { min-width: 0; flex: 1; }
  .topbar { flex-wrap: wrap; }
}