:root {
  color-scheme: light;
  --ink: #162126;
  --muted: #5c6870;
  --paper: #f5f0e6;
  --panel: #fffaf0;
  --line: #d8cdbb;
  --accent: #0f766e;
  --accent-2: #b45309;
  --good: #157f3b;
  --bad: #b42318;
  --shadow: 0 16px 40px rgba(28, 24, 18, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(115deg, rgba(15, 118, 110, 0.14), transparent 38%),
    linear-gradient(250deg, rgba(180, 83, 9, 0.16), transparent 42%),
    var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
a {
  font: inherit;
}

.topbar {
  border-bottom: 1px solid rgba(22, 33, 38, 0.12);
  background: rgba(255, 250, 240, 0.82);
  backdrop-filter: blur(10px);
}

.topbar nav {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  gap: 12px;
  padding: 12px 0;
}

.topbar a {
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.56);
}

.shell {
  width: min(1120px, calc(100% - 28px));
  margin: 0 auto;
  padding: 28px 0 38px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 360px);
  gap: 22px;
  align-items: end;
}

.kicker {
  margin: 0 0 8px;
  color: var(--accent-2);
  font-size: 0.84rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 10px;
  font-size: clamp(2.1rem, 5vw, 4.7rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 8px;
  font-size: 1rem;
}

.lede {
  max-width: 700px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.55;
}

.scoreboard,
.briefing,
.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 250, 240, 0.9);
  box-shadow: var(--shadow);
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  overflow: hidden;
}

.scoreboard div {
  padding: 16px;
  border-left: 1px solid var(--line);
}

.scoreboard div:first-child {
  border-left: 0;
}

.scoreboard span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.scoreboard strong {
  font-size: 1.45rem;
}

.briefing {
  margin: 24px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  padding: 18px;
  align-items: center;
}

#ruleText,
#feedback {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.45;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.96);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

#newBtn {
  color: var(--ink);
  background: #eadfcf;
}

.lab {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 22px;
  align-items: start;
}

.tray {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.specimen {
  min-height: 142px;
  border: 2px solid transparent;
  border-radius: 8px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 8px 22px rgba(28, 24, 18, 0.11);
  color: var(--ink);
  text-align: left;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 8px;
}

.specimen.selected {
  border-color: var(--accent);
  background: #effdf8;
}

.specimen.correct {
  border-color: var(--good);
}

.specimen.wrong {
  border-color: var(--bad);
}

.sample-id {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.sample-art {
  display: grid;
  place-items: center;
  min-height: 50px;
}

.cell {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(22, 33, 38, 0.2);
  background: var(--sample-color);
}

.shape-disc .cell {
  border-radius: 50%;
}

.shape-spear .cell {
  width: 28px;
  transform: skew(-16deg);
}

.shape-tile .cell {
  border-radius: 8px;
}

.shape-arch .cell {
  border-radius: 26px 26px 8px 8px;
}

.traits {
  display: grid;
  gap: 4px;
  font-size: 0.88rem;
  line-height: 1.25;
}

.traits span:last-child {
  color: var(--muted);
}

.panel {
  padding: 18px;
}

.log {
  margin: 14px 0 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.4;
}

.log li + li {
  margin-top: 8px;
}

@media (max-width: 820px) {
  .intro,
  .briefing,
  .lab {
    grid-template-columns: 1fr;
  }

  .actions {
    justify-content: stretch;
  }

  .actions button {
    flex: 1 1 150px;
  }

  .tray {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 460px) {
  .shell {
    width: min(100% - 20px, 1120px);
    padding-top: 18px;
  }

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

  .scoreboard div,
  .scoreboard div:first-child {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .scoreboard div:first-child {
    border-top: 0;
  }

  .tray {
    gap: 10px;
  }

  .specimen {
    min-height: 132px;
    padding: 10px;
  }
}