:root {
  color-scheme: dark;

  --bg: #0d0b09;
  --surface: #1a1613;
  --surface-raised: #262019;
  --border: #332b23;
  --border-strong: #4d4235;
  --text: #f7f3ec;
  --text-muted: #a89b8a;

  --accent: #ffb020;
  --accent-strong: #ffc457;
  --accent-ink: #1a1206;
  --accent-tint: #3a2c11;

  --danger: #ff8a75;
  --danger-surface: #2e1a15;
  --danger-border: #6e2a24;

  --code-bg: #ffffff;
  --code-ink: #000000;

  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-md: 0 6px 16px -6px rgb(0 0 0 / 0.5), 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 18px 40px -14px rgb(0 0 0 / 0.65);

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --gap: 12px;
  --tap: 48px;

  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  background-color: var(--bg);
  color: var(--text);
  accent-color: var(--accent);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

::selection {
  background-color: var(--accent);
  color: var(--accent-ink);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

#app {
  max-width: 720px;
  margin: 0 auto;
  padding: calc(16px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right))
    calc(96px + env(safe-area-inset-bottom)) calc(16px + env(safe-area-inset-left));
}

h1 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.search {
  display: block;
  width: 100%;
  min-height: var(--tap);
  margin-bottom: 16px;
  padding: 12px 14px;
  font: inherit;
  color: inherit;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.search::placeholder {
  color: var(--text-muted);
}

.search:focus {
  border-color: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--gap);
}

.tile {
  --card-color: var(--surface-raised);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  aspect-ratio: 1.6;
  overflow: hidden;
  padding: 12px;
  font: inherit;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-align: left;
  overflow-wrap: anywhere;
  color: #ffffff;
  text-shadow: 0 1px 2px rgb(0 0 0 / 0.4);
  background:
    linear-gradient(180deg, rgb(0 0 0 / 0) 42%, rgb(0 0 0 / 0.58) 100%),
    linear-gradient(
      145deg,
      color-mix(in srgb, var(--card-color) 88%, #ffffff) 0%,
      var(--card-color) 52%,
      color-mix(in srgb, var(--card-color) 84%, #000000) 100%
    );
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm), inset 0 0 0 1px rgb(255 255 255 / 0.12);
  cursor: pointer;
}

.tile:active {
  transform: scale(0.98);
}

.tile--skeleton {
  background: var(--surface);
  box-shadow: none;
  animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {
  50% { opacity: 0.45; }
}

.empty,
.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 48px 8px;
  text-align: center;
}

.empty-text {
  max-width: 34ch;
  color: var(--text-muted);
}

.button {
  min-height: var(--tap);
  padding: 12px 18px;
  font: inherit;
  font-weight: 600;
  color: inherit;
  background-color: var(--surface-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  cursor: pointer;
}

.button:active {
  background-color: var(--surface);
  transform: scale(0.97);
}

.button--ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--text-muted);
}

.button--ghost:active {
  background-color: var(--surface);
}

.button--big {
  min-height: 56px;
  padding: 16px 26px;
  font-size: 18px;
  color: var(--accent-ink);
  background-color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.button--big:active {
  background-color: var(--accent-strong);
}

.button--danger {
  color: var(--danger);
  background-color: var(--danger-surface);
  border-color: var(--danger-border);
}

.detail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: stretch;
}

.detail > .button {
  align-self: flex-start;
}

.code-box {
  /* Vynucené barvy systému (Windows high contrast, tisk) by pruhy přebarvily a čtečka by kód nepřečetla. */
  forced-color-adjust: none;
  print-color-adjust: exact;
  color-scheme: light;
  overflow-x: auto;
  padding: 20px 12px;
  color: var(--code-ink);
  background-color: var(--code-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.code-box > svg,
.code-box > div {
  display: block;
  width: max-content;
  margin: 0 auto;
}

.code-box .hint {
  color: #a11c10;
}

.hint {
  font-size: 14px;
  color: var(--text-muted);
}

.actions {
  display: flex;
  gap: var(--gap);
  flex-wrap: wrap;
}

.card-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

.field input,
.field select {
  min-height: var(--tap);
  padding: 12px 14px;
  font: inherit;
  font-size: 16px;
  font-weight: 400;
  color: var(--text);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-tint);
}

.field input[type='color'] {
  width: 72px;
  padding: 6px;
}

.card-form .hint:empty {
  display: none;
}

.card-form .hint {
  color: var(--danger);
}

@media (prefers-reduced-motion: reduce) {
  .tile--skeleton {
    animation: none;
  }
  .tile:active,
  .button:active {
    transform: none;
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 720px;
  margin: 0 auto;
  padding: calc(16px + env(safe-area-inset-top)) 16px 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand img {
  border-radius: 7px;
}

.share-hero {
  --card-color: var(--surface-raised);
  padding: 14px 18px;
  color: #ffffff;
  text-shadow: 0 1px 2px rgb(0 0 0 / 0.4);
  background:
    linear-gradient(180deg, rgb(0 0 0 / 0) 40%, rgb(0 0 0 / 0.5) 100%),
    linear-gradient(
      145deg,
      color-mix(in srgb, var(--card-color) 88%, #ffffff) 0%,
      var(--card-color) 52%,
      color-mix(in srgb, var(--card-color) 84%, #000000) 100%
    );
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm), inset 0 0 0 1px rgb(255 255 255 / 0.12);
}

.add-card {
  width: 100%;
  margin-top: var(--gap);
}

.tile-label {
  font-weight: 600;
}

.tile-note {
  font-size: 12px;
  opacity: 0.75;
}

.card-form .hint--ok {
  color: var(--text-muted);
}