:root {
  --bg: #FAF6F0;
  --text: #3A3A3A;
  --muted: #888481;
  --card-0: #D6EADF;
  --card-1: #F7D7C4;
  --card-2: #E0D7F0;
  --card-3: #F5E6B8;
  --accent: #6F8C84;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 1.4rem 1rem 0.6rem;
  text-align: center;
}
.brand {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--text);
}

main {
  flex: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem;
}

h1 { font-size: 1.7rem; margin: 0.4rem 0 0.8rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.4rem; }
p { margin: 0.5rem 0; }

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

.intro { margin-bottom: 1.8rem; }

.groups {
  display: grid;
  gap: 0.9rem;
}

.card {
  display: block;
  padding: 1.1rem 1.2rem;
  border-radius: 14px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}
.card-0 { background: var(--card-0); }
.card-1 { background: var(--card-1); }
.card-2 { background: var(--card-2); }
.card-3 { background: var(--card-3); }

.card .desc { margin: 0.3rem 0 0.4rem; }
.card .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.55rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.45rem 0 0.2rem;
}
.tag {
  background: rgba(255,255,255,0.55);
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--text);
}

.group-header h1 { margin-bottom: 0.25rem; }
.group-header .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.3rem;
}

.actions {
  display: flex;
  gap: 0.6rem;
  margin: 1.6rem 0 1rem;
  flex-wrap: wrap;
}

button {
  background: var(--card-0);
  border: none;
  padding: 0.7rem 1.2rem;
  border-radius: 10px;
  font: inherit;
  color: var(--text);
  cursor: pointer;
  transition: filter 0.12s ease;
}
button:hover:not(:disabled) { filter: brightness(0.96); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

#btn-list { background: var(--card-2); }

#btn-clear {
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.2rem;
  font-size: 0.85rem;
  margin-top: 0.5rem;
}
#btn-clear:hover:not(:disabled) { color: var(--text); filter: none; }

#counter {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.question-display {
  background: var(--card-3);
  padding: 2rem 1.4rem;
  border-radius: 14px;
  font-size: 1.25rem;
  min-height: 5rem;
  text-align: center;
  margin: 0.6rem 0 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.question-display:empty::before {
  content: "Klikněte na „Náhodná otázka“";
  color: var(--muted);
  font-size: 0.95rem;
}

.exhausted {
  background: var(--card-1);
  padding: 0.8rem 1rem;
  border-radius: 10px;
  text-align: center;
  margin: 0.6rem 0;
}

.question-list { display: grid; gap: 0.6rem; margin-top: 1rem; }
.q-card {
  background: var(--card-1);
  padding: 0.9rem 1.1rem;
  border-radius: 10px;
}
.q-card:nth-child(4n+2) { background: var(--card-0); }
.q-card:nth-child(4n+3) { background: var(--card-2); }
.q-card:nth-child(4n+4) { background: var(--card-3); }

footer {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}
footer a { color: var(--accent); }

@media (max-width: 480px) {
  h1 { font-size: 1.45rem; }
  .question-display { font-size: 1.1rem; padding: 1.5rem 1rem; }
}