/* ── Reset & variables ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --border: #334155;
  --cell: 52px;
  --gap: 3px;
  --black: #0f172a;
  --white: #f8fafc;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --success: #4ade80;
  --danger: #f87171;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --radius: 8px;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

/* ── Container ── */
.container {
  text-align: center;
  padding: 2rem 1rem;
  max-width: 370px;
  width: 100%;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0.4rem 0 1.5rem;
}

/* ── Game layout ── */
.game-wrapper {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

/* Row labels left column */
.row-labels {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  margin-right: auto;
  align-items: flex-end;
  /* padding-top: calc(2 * (var(--cell) + var(--gap))); offset for 2 clue rows */
  padding-top: 90px;
}

.clue-row {
  min-width: 20px;
  height: var(--cell);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  padding-right: 4px;
}

/* Right block: column clues + grid */
.right-side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.col-labels-row {
  display: flex;
  gap: var(--gap);
}

.clue-col {
  width: var(--cell);
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ── Grid ── */
.grid {
  display: grid;
  grid-template-columns: repeat(5, var(--cell));
  grid-template-rows: repeat(5, var(--cell));
  gap: var(--gap);
  background: var(--border);
  padding: var(--gap);
  border-radius: var(--radius);
  margin-top: var(--gap);
}

/* ── Cells ── */
.cell {
  background: var(--white);
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
  user-select: none;
}

.cell:hover {
  background: #e2e8f0;
  transform: scale(1.05);
}

.cell.black {
  background: var(--black);
  box-shadow: inset 0 0 0 2px var(--border);
}

.cell.black:hover {
  background: #1e293b;
}

/* ── Buttons ── */
.controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.btn {
  padding: 0.6rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent);
  color: var(--black);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

#resetBtn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

#resetBtn:hover {
  background: #334155;
}

/* ── Message ── */
.message {
  min-height: 1.6rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
}

.message.success {
  color: var(--success);
}

.message.error {
  color: var(--danger);
}