:root {
  --bg: #f5f3ef;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #5d6270;
  --line: #e3e0d9;
  --accent: #c8102e;
  --accent-soft: #fbe7ea;
  --bar: #a9aebb;
  --chip: #ecebe6;
  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1729;
    --surface: #17213a;
    --text: #eef1f7;
    --muted: #9aa4ba;
    --line: #26314d;
    --accent: #ff5a6e;
    --accent-soft: #3a1f2c;
    --bar: #4a5677;
    --chip: #1f2a46;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
}

a { color: inherit; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

main, .top, .foot {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- hlavička ---------- */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.brand span { color: var(--accent); }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.share {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: 6px 16px;
  font-weight: 600;
}
.share:hover { border-color: var(--muted); }

.top-actions { display: flex; align-items: center; gap: 8px; }

/* ---------- hero ---------- */

.hero {
  text-align: center;
  padding: 24px 0 40px;
}

.mode-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
}

.play {
  flex: none;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--chip);
  color: var(--text);
}
.play:hover { color: var(--accent); }
.play svg { width: 20px; height: 20px; fill: currentColor; }
.play .icon-play,
.play[aria-pressed="true"] .icon-pause { display: none; }
.play[aria-pressed="true"] .icon-play { display: block; }
.play[aria-pressed="true"] { color: var(--accent); }
.play:disabled { opacity: 0.4; cursor: default; color: var(--text); }
.play-top,
.mode-select { display: none; }

.mode-select select {
  width: 100%;
  appearance: none;
  padding: 12px 40px 12px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 14px center / 16px;
  color: var(--text);
  font: inherit;
  font-weight: 600;
}

.modes {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
  padding: 4px;
  background: var(--chip);
  border-radius: 999px;
}

.modes button {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 8px 16px;
  font-weight: 600;
  color: var(--muted);
}
.modes button[aria-checked="true"] {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.12);
}

.hero-label {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--muted);
}

.counter {
  margin: 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.4rem, 7.5vw, 4.5rem);
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1.1;
  word-break: break-word;
}

/* Každý znak má vlastní okénko; měnící se číslice vyjede ve směru změny. */
.slide-counter { display: inline-flex; justify-content: center; }
.slot {
  position: relative;
  display: inline-block;
  overflow: hidden;
  height: 1.15em;
  line-height: 1.15em;
  vertical-align: top;
}
.slot > span { display: block; }
.slot > span.out { position: absolute; inset: 0; }

.counter-sub {
  margin: 12px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.badge {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  vertical-align: 2px;
}

.mode-note,
.estimate,
.context {
  margin: 6px auto 0;
  max-width: 560px;
  font-size: 0.9rem;
  color: var(--muted);
}
.estimate { margin-top: 8px; font-size: 0.82rem; }
.estimate.warn {
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--text);
}
.context {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--text);
}

/* ---------- dlaždice ---------- */

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.tile,
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.tile { padding: 16px; }

.tile-label {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.tile-value {
  margin: 4px 0 0;
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.tile-note {
  margin: 2px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---------- karty ---------- */

.card {
  padding: 24px 20px;
  margin-bottom: 24px;
}

.card h2 {
  margin: 0 0 4px;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.card-sub {
  margin: 0 0 16px;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- kalkulačka ---------- */

.calc {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin: 16px 0 20px;
}

.calc label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

.stepper {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  width: max-content;
}
.stepper button {
  width: 40px;
  height: 40px;
  border: 0;
  background: transparent;
  font-size: 1.2rem;
  border-radius: 999px;
}
.stepper button:hover { background: var(--chip); }
.stepper output {
  min-width: 2.5ch;
  text-align: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.calc-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* ---------- grafy ---------- */

.toggle {
  display: inline-flex;
  gap: 2px;
  margin: 8px 0 12px;
  padding: 3px;
  background: var(--chip);
  border-radius: 999px;
}
.toggle button {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}
.toggle button[aria-checked="true"] {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.12);
}

.chart svg { display: block; width: 100%; height: auto; }
.chart .bar { fill: var(--bar); }
.chart .bar.now { fill: var(--accent); }
.chart .axis { fill: var(--muted); font-size: 11px; }
.chart .grid { stroke: var(--line); }
.chart .value { fill: var(--text); font-size: 12px; font-weight: 700; }

.chart-tip {
  min-height: 1.5em;
  margin: 8px 0 0;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.bars { display: grid; gap: 10px; }

.bar-row {
  display: grid;
  grid-template-columns: 7.5rem 1fr 3.5rem;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
}
.bar-row .track { height: 14px; background: var(--chip); border-radius: 999px; overflow: hidden; }
.bar-row .fill { display: block; height: 100%; background: var(--bar); border-radius: 999px; }
.bar-row.cz { font-weight: 700; }
.bar-row.cz .fill { background: var(--accent); }
.bar-row .num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- FAQ, zdroje ---------- */

.faq details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 8px 0 0; color: var(--muted); }
.faq .defs,
.about .defs { margin: 8px 0 0; padding: 0; list-style: none; color: var(--muted); }
.faq .defs li + li,
.about .defs li + li { margin-top: 6px; }
.about p { margin: 8px 0 0; }

.sources ul { margin: 12px 0 16px; padding-left: 20px; }
.sources li { margin: 4px 0; }

.foot {
  padding-top: 8px;
  padding-bottom: 40px;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.noscript { text-align: center; padding: 16px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  .modes,
  .play-hero { display: none; }
  .mode-select { display: block; flex: 1; }
  .mode-bar { margin-bottom: 24px; }
  .play-top { display: grid; width: 36px; height: 36px; }
  .play-top svg { width: 16px; height: 16px; }

  /* Dlaždice 2 × 2: kratší stránka, čísla vedle sebe jdou lépe porovnat. */
  .tiles { grid-template-columns: 1fr 1fr; gap: 8px; }
  .tile { padding: 12px; }
  .tile-label { font-size: 0.78rem; line-height: 1.3; }
  .tile-value { font-size: 1.15rem; }
  .tile-note { font-size: 0.72rem; line-height: 1.35; }

  .bar-row { grid-template-columns: 6rem 1fr 3rem; }
}