/* ── Variables ──────────────────────────────────────────────────────────────── */

:root {
  --bg: #c0c0c0;
  --border-light: #ffffff;
  --border-dark: #808080;
  --border-darker: #404040;
  --cell-size: 28px;
  --cell-size-sm: 22px;
  --lcd-bg: #000;
  --lcd-fg: #ff0000;
  --font-mono: 'Courier New', Courier, monospace;
  --radius: 2px;
}

/* ── Reset ───────────────────────────────────────────────────────────────────── */

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

body {
  background: #9e9e9e;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 14px;
  min-height: 100dvh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 12px;
}

/* ── App shell ──────────────────────────────────────────────────────────────── */

#app {
  background: var(--bg);
  border-top: 3px solid var(--border-light);
  border-left: 3px solid var(--border-light);
  border-right: 3px solid var(--border-darker);
  border-bottom: 3px solid var(--border-darker);
  padding: 12px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 100%;
}

/* ── Header ─────────────────────────────────────────────────────────────────── */

.app-header {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  justify-content: center;
}

.app-header h1 {
  font-size: 1.2rem;
  font-weight: bold;
  letter-spacing: 0.05em;
}

.lang-btn {
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-right: 2px solid var(--border-darker);
  border-bottom: 2px solid var(--border-darker);
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: bold;
  cursor: pointer;
  min-width: 32px;
}

.lang-btn:hover {
  filter: brightness(1.05);
}

/* ── Difficulty buttons ─────────────────────────────────────────────────────── */

.difficulty-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
}

.diff-btn {
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-right: 2px solid var(--border-darker);
  border-bottom: 2px solid var(--border-darker);
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
}

.diff-btn.active {
  border-top: 2px solid var(--border-darker);
  border-left: 2px solid var(--border-darker);
  border-right: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-light);
  background: #b0b0b0;
}

.diff-btn:hover:not(.active) {
  filter: brightness(1.05);
}

/* ── Custom form ─────────────────────────────────────────────────────────────── */

.custom-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  background: #b8b8b8;
  border-top: 2px solid var(--border-darker);
  border-left: 2px solid var(--border-darker);
  border-right: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-light);
  padding: 6px 10px;
  width: 100%;
}

.custom-form label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
}

.custom-form input[type="number"] {
  width: 52px;
  padding: 2px 4px;
  font-size: 0.8rem;
  border-top: 2px solid var(--border-darker);
  border-left: 2px solid var(--border-darker);
  border-right: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-light);
  background: white;
}

#custom-apply {
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-right: 2px solid var(--border-darker);
  border-bottom: 2px solid var(--border-darker);
  padding: 3px 10px;
  font-size: 0.8rem;
  cursor: pointer;
}

#custom-apply:hover {
  filter: brightness(1.05);
}

/* ── Status bar ──────────────────────────────────────────────────────────────── */

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 6px 8px;
  background: var(--bg);
  border-top: 3px solid var(--border-darker);
  border-left: 3px solid var(--border-darker);
  border-right: 3px solid var(--border-light);
  border-bottom: 3px solid var(--border-light);
}

.lcd-display {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--lcd-bg);
  padding: 2px 6px;
  border-top: 2px solid var(--border-darker);
  border-left: 2px solid var(--border-darker);
  border-right: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-light);
  min-width: 70px;
}

.lcd-icon {
  font-size: 0.9rem;
}

.lcd-num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--lcd-fg);
  letter-spacing: 2px;
  min-width: 36px;
  text-align: right;
}

.smiley-btn {
  font-size: 1.4rem;
  background: var(--bg);
  border-top: 3px solid var(--border-light);
  border-left: 3px solid var(--border-light);
  border-right: 3px solid var(--border-darker);
  border-bottom: 3px solid var(--border-darker);
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
}

.smiley-btn:active {
  border-top: 3px solid var(--border-darker);
  border-left: 3px solid var(--border-darker);
  border-right: 3px solid var(--border-light);
  border-bottom: 3px solid var(--border-light);
}

/* ── Grid ────────────────────────────────────────────────────────────────────── */

.grid {
  display: grid;
  grid-template-columns: repeat(var(--cols, 9), var(--cell-size));
  border-top: 3px solid var(--border-darker);
  border-left: 3px solid var(--border-darker);
  border-right: 3px solid var(--border-light);
  border-bottom: 3px solid var(--border-light);
  overflow-x: auto;
  max-width: calc(100vw - 40px);
}

/* ── Cells ───────────────────────────────────────────────────────────────────── */

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  font-size: 0.8rem;
  font-weight: bold;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  padding: 0;
  line-height: 1;
  transition: filter 0.05s;
  position: relative;
}

.cell:focus {
  outline: 2px solid #0056b3;
  outline-offset: -2px;
  z-index: 1;
}

/* Unrevealed: classic raised button look */
.cell.unrevealed {
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-right: 2px solid var(--border-darker);
  border-bottom: 2px solid var(--border-darker);
}

.cell.unrevealed:hover {
  filter: brightness(1.08);
}

.cell.unrevealed:active {
  border-top: 1px solid var(--border-dark);
  border-left: 1px solid var(--border-dark);
  border-right: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
  background: #b8b8b8;
}

/* Revealed: flat */
.cell.revealed {
  background: #c8c8c8;
  border: 1px solid var(--border-dark);
}

/* Mine */
.cell.mine {
  background: #ff4040;
  border: 1px solid var(--border-dark);
  font-size: 1rem;
}

/* Flagged */
.cell.flagged {
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-right: 2px solid var(--border-darker);
  border-bottom: 2px solid var(--border-darker);
}

/* Wrong flag on loss */
.cell.wrong-flag {
  background: #ffb0b0;
  border: 1px solid var(--border-dark);
}

/* Number colors — classic minesweeper palette */
.cell.n1 { color: #0000ff; } /* blue */
.cell.n2 { color: #008000; } /* green */
.cell.n3 { color: #ff0000; } /* red */
.cell.n4 { color: #000080; } /* dark blue */
.cell.n5 { color: #800000; } /* maroon */
.cell.n6 { color: #008080; } /* teal */
.cell.n7 { color: #000000; } /* black */
.cell.n8 { color: #808080; } /* gray */

/* ── Best times ──────────────────────────────────────────────────────────────── */

.best-times {
  background: #b8b8b8;
  border-top: 2px solid var(--border-darker);
  border-left: 2px solid var(--border-darker);
  border-right: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-light);
  padding: 8px 16px;
  width: 100%;
  font-size: 0.8rem;
}

.best-times h3 {
  font-size: 0.85rem;
  margin-bottom: 6px;
  text-align: center;
  letter-spacing: 0.05em;
}

.best-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 2px 0;
}

.best-label {
  font-weight: bold;
}

.best-val {
  font-family: var(--font-mono);
  color: #222;
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */

.app-footer {
  font-size: 0.72rem;
  color: #444;
  text-align: center;
}

.app-footer a {
  color: #333;
}

/* ── Responsive ─────────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
  :root {
    --cell-size: var(--cell-size-sm);
  }

  .cell {
    font-size: 0.7rem;
  }

  .cell.mine {
    font-size: 0.85rem;
  }

  .lcd-num {
    font-size: 1rem;
  }
}