:root {
  --paper: #edf1ef;
  --panel: #f8faf9;
  --ink: #18241f;
  --ink-2: #4b5b55;
  --ink-3: #6b7a75;
  --line: #c8d2ce;
  --accent: #3454a6; /* cornflower, the national flower of Estonia */
  --accent-ink: #ffffff;
  --accent-soft: #dfe6f6;
  --good: #2c7148;
  --good-soft: #dcefe2;
  --bad: #a93f2a;
  --bad-soft: #f6e0da;
  --serif: 'Alegreya', Georgia, serif;
  --sans: 'Alegreya Sans', system-ui, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #111816;
    --panel: #18211e;
    --ink: #e4ebe8;
    --ink-2: #aab8b3;
    --ink-3: #8a9893;
    --line: #2e3a36;
    --accent: #93abea;
    --accent-ink: #0f1a33;
    --accent-soft: #232f4a;
    --good: #7ccb98;
    --good-soft: #1c3326;
    --bad: #f0927b;
    --bad-soft: #3b211b;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 18px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

main, footer, .topbar {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 16px;
}

.topbar { display: flex; justify-content: flex-end; padding-top: 0.75rem; }
#ui-toggle {
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--ink-2);
  font: 500 0.9rem var(--sans);
  cursor: pointer;
}
#ui-toggle:hover { border-color: var(--accent); color: var(--accent); }

main { padding-top: 1rem; padding-bottom: 3rem; min-height: 80vh; }
footer { padding-bottom: 2rem; color: var(--ink-3); font-size: 0.85rem; }

h1, h2, .reveal-name { font-family: var(--serif); font-weight: 500; line-height: 1.1; margin: 0; }
h1 { font-size: 3.4rem; letter-spacing: -0.01em; }
h2 { font-size: 1.55rem; margin: 2.5rem 0 0.5rem; }
i { font-family: var(--serif); }
a { color: var(--accent); text-underline-offset: 0.18em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 36rem; margin: 0.75rem 0 1.25rem; }
.note { color: var(--ink-3); font-size: 0.9rem; margin: 0 0 0.75rem; }
.prose { max-width: 38rem; margin: 0; }
.loading { color: var(--ink-2); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
kbd { font: inherit; font-size: 0.8em; color: var(--ink-3); }

.button {
  display: inline-flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.6rem 1.1rem;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  font: 500 1rem var(--sans);
  text-decoration: none;
  cursor: pointer;
}
.button kbd { color: inherit; opacity: 0.75; }

.crumbs {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  color: var(--ink-3);
}
.crumbs span a { margin-left: 1rem; }

/* Home */
.masthead h1 { font-size: 4.2rem; }

.settings { display: grid; gap: 0.4rem; margin: 1.5rem 0 0; }
.settings fieldset { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; align-items: baseline; }
.settings legend { float: left; width: 7rem; color: var(--ink-3); }
.settings label { cursor: pointer; }
.settings input { accent-color: var(--accent); }

.toc { list-style: none; padding: 0; margin: 0; }
.toc a {
  display: grid;
  grid-template-columns: 2.6rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 0.7rem 0.5rem;
  margin: 0 -0.5rem;
  border-radius: 6px;
  color: inherit;
  text-decoration: none;
}
.toc a:hover { background: var(--panel); }
.toc-num { font: 500 1.5rem var(--serif); color: var(--ink-3); text-align: right; }
.toc-title { font-family: var(--serif); font-size: 1.3rem; line-height: 1.25; }
.toc-sub { display: block; font: 0.9rem var(--sans); color: var(--ink-3); margin-top: 0.15rem; }
.toc-meta { color: var(--ink-3); font-size: 0.85rem; text-align: right; white-space: nowrap; }
.toc-meta meter { display: block; width: 7rem; height: 4px; margin: 0.35rem 0 0 auto; }

meter { appearance: none; background: var(--line); border-radius: 2px; }
meter::-webkit-meter-bar { background: var(--line); border: 0; border-radius: 2px; height: 4px; }
meter::-webkit-meter-optimum-value, meter::-webkit-meter-suboptimum-value, meter::-webkit-meter-even-less-good-value { background: var(--accent); border-radius: 2px; }
meter::-moz-meter-bar { background: var(--accent); border-radius: 2px; }

/* Chapter */
.chapter-title { font-size: 3rem; }

.group h2 { margin-top: 2.75rem; }
.group-sub { display: block; font: 0.95rem var(--sans); color: var(--ink-3); margin-top: 0.2rem; }

.grid {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(10.5rem, 1fr));
  gap: 1.5rem 1rem;
}
.grid a { display: block; color: inherit; text-decoration: none; }
.grid a:hover .grid-name { color: var(--accent); }
.thumb { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 4px; background: var(--panel); }
.grid-name { display: block; font: 500 1.15rem/1.2 var(--serif); margin-top: 0.45rem; }
.grid-sub { display: block; color: var(--ink-3); font-size: 0.9rem; }
.learned { color: var(--good); font-family: var(--sans); font-size: 0.9rem; }
.grid .rare .thumb { opacity: 0.6; }
.grid .rare .grid-name { color: var(--ink-2); }

/* Species */
.species-head h1 { font-size: 3.6rem; }
.names { font-size: 1.25rem; color: var(--ink-2); margin: 0.35rem 0 0; }
.names i { margin-left: 0.4rem; }

.hero { margin: 1.5rem 0 0; }
.hero-img { display: block; width: 100%; max-height: 70vh; object-fit: contain; background: var(--panel); border-radius: 4px; }
figcaption { color: var(--ink-3); font-size: 0.85rem; margin-top: 0.4rem; }

.strip { list-style: none; padding: 0; margin: 0.75rem 0 0; display: flex; gap: 6px; overflow-x: auto; }
.strip button { padding: 0; border: 0; background: none; cursor: pointer; width: 5.5rem; flex: none; }

.sounds { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.75rem; }
.sounds li { display: grid; gap: 0.15rem; }
.sounds audio { width: 100%; max-width: 26rem; height: 2.25rem; }
.sounds .note { display: block; margin: 0; }

.season { margin: 0; max-width: 36rem; }
.season svg { display: block; width: 100%; height: auto; overflow: visible; }
.season line { stroke: var(--line); }
.season .bar { fill: var(--accent); }
.season .hit { fill: transparent; }
.season g:hover .bar { fill: var(--ink); }
.season text { fill: var(--ink-3); font: 9px var(--sans); text-anchor: middle; }

.facts { display: grid; grid-template-columns: max-content 1fr; gap: 0.35rem 1.25rem; margin: 0; }
.facts dt { color: var(--ink-3); }
.facts dd { margin: 0; }

/* Practice */
.stage { margin: 0; }
.stage-img { display: block; width: 100%; height: min(58vh, 34rem); object-fit: contain; background: var(--panel); border-radius: 4px; }
.stage.sound { display: grid; place-items: center; height: 12rem; background: var(--panel); border-radius: 4px; }
.play {
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  border: 0;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 1.8rem;
  cursor: pointer;
}

.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; margin-top: 1rem; }
.choices button {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.75rem;
  text-align: left;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink);
  font: 500 1.2rem var(--serif);
  cursor: pointer;
}
.choices button:hover:not(:disabled) { border-color: var(--accent); }
.choices button:disabled { cursor: default; color: var(--ink-3); }
.choices button.right { border-color: var(--good); background: var(--good-soft); color: var(--ink); }
.choices button.wrong { border-color: var(--bad); background: var(--bad-soft); color: var(--ink); }
.mark { font: 500 0.85rem var(--sans); margin-left: auto; }
.right .mark { color: var(--good); }
.wrong .mark { color: var(--bad); }

.reveal:not(:empty) { margin-top: 1.5rem; animation: reveal 280ms ease-out; }
.reveal-photo { margin: 0 0 1rem; }
.verdict { font-weight: 700; margin: 0; }
.verdict.right { color: var(--good); }
.verdict.wrong { color: var(--bad); }
.reveal-name { font-size: 3.6rem; margin-top: 0.15rem; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.5rem; margin-top: 1.25rem; }

@keyframes reveal {
  from { opacity: 0; transform: translateY(8px); }
}

@media (prefers-reduced-motion: reduce) {
  .reveal:not(:empty) { animation: none; }
}

@media (max-width: 560px) {
  body { font-size: 17px; }
  h1, .species-head h1, .reveal-name { font-size: 2.6rem; }
  .masthead h1 { font-size: 3rem; }
  .chapter-title { font-size: 2.3rem; }
  .choices { grid-template-columns: 1fr; }
  .toc a { grid-template-columns: 2rem 1fr; }
  .toc-meta { grid-column: 2; text-align: left; }
  .toc-meta meter { margin-left: 0; }
}