:root {
  color-scheme: light;
  --bg: #f6f7f2;
  --paper: #ffffff;
  --ink: #17201b;
  --muted: #607068;
  --line: #d9dfd6;
  --leaf: #2f7d52;
  --leaf-dark: #225b3c;
  --amber: #b87322;
  --blue: #2d6f91;
  --berry: #8f3150;
  --wrong: #b3423a;
  --right: #1f7a46;
  --shadow: 0 18px 46px rgba(28, 38, 31, 0.13);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(47, 125, 82, 0.08), rgba(246, 247, 242, 0) 260px),
    var(--bg);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1420px, 100%);
  margin: 0 auto;
  padding: 18px;
}

.topbar,
.mode-tabs,
.source-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar {
  padding: 10px 2px 16px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--leaf-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 5vw, 3.75rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.35rem, 3.2vw, 2.25rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.score-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  max-width: 560px;
}

.score-strip span,
.badge {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.score-strip strong {
  color: var(--ink);
  margin-right: 4px;
}

.mode-tabs {
  justify-content: flex-start;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 112px;
  min-height: 46px;
  padding: 8px 14px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--muted);
  font-weight: 800;
}

.tab.active {
  color: var(--leaf-dark);
  border-bottom-color: var(--leaf);
}

.tab svg,
button svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.quiz-view,
.compare-layout {
  display: none;
  grid-template-columns: minmax(230px, 280px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.quiz-view.active,
.compare-view.active .compare-layout {
  display: grid;
}

.control-panel,
.quiz-card,
.learn-toolbar,
.compare-table-wrap {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.control-panel {
  position: sticky;
  top: 14px;
  display: grid;
  gap: 14px;
  padding: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label,
.toggle-row label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

select,
input[type="search"] {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  padding: 8px 10px;
}

.toggle-row {
  display: grid;
  gap: 10px;
}

.toggle-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--leaf);
}

.secondary-btn,
.icon-btn,
.choice-btn,
.next-btn,
.flag-btn {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--paper);
  color: var(--ink);
}

.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 8px 12px;
  font-weight: 800;
}

.secondary-btn:hover,
.icon-btn:hover,
.choice-btn:hover,
.flag-btn:hover {
  border-color: var(--leaf);
}

.quiz-card {
  overflow: hidden;
}

.image-frame {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  min-height: 360px;
  height: clamp(360px, 54vh, 620px);
  background:
    linear-gradient(45deg, rgba(47, 125, 82, 0.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(47, 125, 82, 0.08) 25%, transparent 25%),
    #f9fbf7;
  background-size: 24px 24px;
}

.image-frame img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: contain;
  padding: 14px;
  transition: opacity 160ms ease;
}

.image-frame img[src=""] {
  opacity: 0;
}

.image-fallback {
  position: absolute;
  inset: 0;
  display: none;
  place-items: center;
  color: var(--muted);
  font-weight: 800;
}

.image-fallback.active {
  display: grid;
}

.flag-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 7px 10px;
  font-size: 0.84rem;
  font-weight: 800;
}

.image-frame .flag-btn,
.card-flag {
  position: absolute;
  right: 12px;
  bottom: 12px;
  z-index: 2;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 24px rgba(23, 32, 27, 0.16);
}

.flag-btn.active {
  color: #ffffff;
  background: var(--wrong);
  border-color: var(--wrong);
}

.question-bar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 18px;
  border-top: 1px solid var(--line);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
}

.choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 0 18px 18px;
}

.choice-btn {
  display: grid;
  gap: 3px;
  min-height: 78px;
  padding: 12px;
  text-align: left;
}

.choice-btn strong,
.species-card h3 {
  font-size: 1rem;
  line-height: 1.15;
}

.choice-btn span {
  color: var(--muted);
  font-size: 0.86rem;
  font-style: italic;
}

.choice-btn.correct {
  border-color: rgba(31, 122, 70, 0.65);
  background: rgba(31, 122, 70, 0.1);
}

.choice-btn.wrong {
  border-color: rgba(179, 66, 58, 0.65);
  background: rgba(179, 66, 58, 0.08);
}

.feedback {
  margin: 0 18px 18px;
  padding: 14px;
  border-left: 5px solid var(--leaf);
  border-radius: 6px;
  background: #f1f6ef;
}

.feedback.wrong {
  border-left-color: var(--wrong);
  background: #fbf0ee;
}

.feedback-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.feedback h3 {
  margin: 0;
}

.next-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 6px 10px;
  color: var(--paper);
  background: var(--leaf-dark);
  border-color: var(--leaf-dark);
  font-weight: 800;
}

.trait-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
}

.trait-row .badge:nth-child(3n + 1) {
  border-color: rgba(47, 125, 82, 0.28);
}

.trait-row .badge:nth-child(3n + 2) {
  border-color: rgba(184, 115, 34, 0.32);
}

.trait-row .badge:nth-child(3n) {
  border-color: rgba(45, 111, 145, 0.32);
}

.source-line {
  color: var(--muted);
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

.source-line a {
  color: var(--blue);
}

.learn-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(170px, 240px) minmax(150px, 200px) minmax(150px, 200px);
  gap: 12px;
  margin-bottom: 16px;
  padding: 14px;
}

.species-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 14px;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 22px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
  font-weight: 800;
  text-align: center;
}

.species-card {
  display: grid;
  grid-template-rows: auto 1fr;
  align-content: start;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 10px 28px rgba(28, 38, 31, 0.09);
}

.species-card.flagged-card {
  border-color: rgba(179, 66, 58, 0.58);
}

.card-image {
  position: relative;
  min-height: 190px;
  background: #f9fbf7;
}

.species-card img {
  display: block;
  width: 100%;
  height: 190px;
  object-fit: contain;
  padding: 10px;
  background: #f9fbf7;
}

.card-flag {
  min-height: 34px;
  padding: 6px 9px;
}

.species-card-body {
  display: grid;
  gap: 8px;
  padding: 12px;
}

.species-card h3 {
  margin: 0;
}

.latin {
  color: var(--muted);
  font-size: 0.88rem;
  font-style: italic;
}

.compare-table-wrap {
  overflow: auto;
}

.compare-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

.compare-table th,
.compare-table td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #edf3ec;
  color: var(--leaf-dark);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.compare-thumb {
  width: 86px;
  height: 62px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f9fbf7;
}

.flagged-row {
  background: rgba(179, 66, 58, 0.05);
}

.flag-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  color: var(--wrong);
  font-size: 0.8rem;
  font-weight: 800;
}

.flag-note svg {
  width: 15px;
  height: 15px;
}

.source-footer {
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 22px;
  padding: 16px 0 4px;
  color: var(--muted);
  font-size: 0.84rem;
}

@media (max-width: 820px) {
  .app-shell {
    padding: 12px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .score-strip {
    justify-content: flex-start;
  }

  .mode-tabs {
    overflow-x: auto;
  }

  .tab {
    min-width: 96px;
  }

  .quiz-view.active,
  .compare-view.active .compare-layout {
    display: grid;
    grid-template-columns: 1fr;
  }

  .control-panel {
    position: static;
    grid-template-columns: 1fr 1fr;
  }

  .toggle-row,
  .secondary-btn {
    grid-column: 1 / -1;
  }

  .image-frame {
    min-height: 300px;
    height: 48vh;
  }

  .choices {
    grid-template-columns: 1fr;
  }

  .learn-toolbar {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .app-shell {
    padding: 10px;
  }

  .score-strip span {
    min-height: 28px;
    font-size: 0.82rem;
  }

  .control-panel {
    grid-template-columns: 1fr;
  }

  .image-frame {
    min-height: 260px;
    height: 42vh;
  }

  .question-bar {
    padding: 14px;
  }

  .choices {
    padding: 0 14px 14px;
  }

  .feedback {
    margin: 0 14px 14px;
  }

  .species-grid {
    grid-template-columns: 1fr;
  }
}

/* WV county range map */
.range-map {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 2px 0 2px;
}

.wv-map {
  width: 116px;
  height: auto;
  flex: 0 0 auto;
  display: block;
}

.wv-county {
  fill: #e8ece6;
  stroke: #c2ccc3;
  stroke-width: 1.1;
  vector-effect: non-scaling-stroke;
}

.wv-county.on {
  fill: var(--leaf);
  stroke: var(--leaf-dark);
}

.range-label {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.3;
}

.range-map.feedback-map .wv-map {
  width: 140px;
}

/* Tree info: summary + quick facts */
.tree-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 4px 0 2px;
}

.tree-summary {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
}

.summary-src {
  color: var(--leaf-dark);
  white-space: nowrap;
}

.info-columns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  align-items: flex-start;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 14px;
  flex: 1 1 230px;
  min-width: 0;
}

.fact {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 12.5px;
  padding: 3px 0;
  border-bottom: 1px solid var(--line);
}

.fact-label {
  color: var(--muted);
}

.fact-value {
  color: var(--ink);
  font-weight: 600;
  text-align: right;
}

/* In the quiz feedback panel, give the facts a touch more room */
.feedback .tree-info {
  margin-top: 6px;
}

/* Multi-image gallery in Learn cards */
.card-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  padding: 10px 10px 0;
}

.gallery-item {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gallery-img {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 10px;
  overflow: hidden;
  background: var(--line);
}

.gallery-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.gallery-item figcaption {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.gallery-item .card-flag {
  position: absolute;
  top: 6px;
  right: 6px;
  font-size: 11px;
  padding: 3px 7px;
}

.gallery-item.flagged-card .gallery-img {
  outline: 2px solid var(--berry);
  outline-offset: -2px;
}

.source-line.tiny {
  font-size: 10.5px;
  line-height: 1.3;
  margin: 0;
  overflow-wrap: anywhere;
}

.no-thumb {
  color: var(--muted);
  font-size: 18px;
}

/* Invasive species view */
.invasive-intro {
  margin-bottom: 14px;
}
.invasive-intro h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 6px;
  color: var(--berry);
}
.invasive-intro p {
  margin: 0;
  color: var(--muted);
  max-width: 70ch;
  line-height: 1.5;
}
.invasive-species-card {
  border-top: 3px solid var(--berry);
}
.origin-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--berry);
  background: rgba(143, 49, 80, 0.08);
  padding: 3px 9px;
  border-radius: 999px;
}
.origin-badge svg { width: 13px; height: 13px; }
.id-clues {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 13px;
  line-height: 1.45;
}
.id-clues strong { color: var(--leaf-dark); }
.invasive-note, .removal-note {
  font-size: 13px;
  line-height: 1.5;
  padding: 9px 11px;
  border-radius: 10px;
}
.invasive-note {
  background: rgba(143, 49, 80, 0.07);
}
.removal-note {
  background: rgba(47, 125, 82, 0.08);
}
.removal-note strong, .invasive-note strong { display: inline-flex; align-items: center; gap: 5px; }
.removal-note svg, .invasive-note svg { width: 14px; height: 14px; }