:root {
  --bg: transparent;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(15, 23, 42, 0.12);
  --ring: rgba(15, 23, 42, 0.35);
  --accent: #0f172a;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
}

.app {
  max-width: 1020px;
  margin: 0 auto;
  padding: 16px;
}

.header {
  margin: 0 0 12px 0;
}

.title {
  font-size: 20px;
  line-height: 1.2;
  margin: 0 0 4px 0;
}

.subtitle {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

@media (min-width: 540px) {
  .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 860px) {
  .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  padding: 10px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  text-align: left;
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.tile:focus { outline: none; box-shadow: 0 0 0 4px rgba(15,23,42,0.15); }

.tile:hover { transform: translateY(-1px); border-color: var(--ring); }

.tile.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.12);
}

.square {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(2, 6, 23, 0.03);
}

.square img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.tile-label {
  font-size: 14px;
  font-weight: 600;
}

.check {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 120ms ease, transform 120ms ease;
}

.tile.selected .check {
  opacity: 1;
  transform: scale(1);
}

.check svg { width: 16px; height: 16px; }

.controls {
  display: flex;
  gap: 10px;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.btn:hover { transform: translateY(-1px); border-color: var(--ring); }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.form {
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  font-size: 13px;
  font-weight: 600;
}

input, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font: inherit;
}

textarea { min-height: 96px; resize: vertical; }

.helper {
  font-size: 12px;
  color: var(--muted);
}

.hidden { display: none !important; }

.notice {
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.03);
  color: var(--text);
}

.small {
  font-size: 12px;
  color: var(--muted);
}