/* reset y tokens */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* base */
  --bg: #808080;
  --card: #f0f0f0;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #d1d5db;
  --white: #ffffff;
  --black: #000000;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --radius: 0px;
  --mono: 'Courier New', 'Consolas', 'Monaco', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* escala de espacio */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;

  /* tamaños */
  --logo-size: 200px;
  --board-gap: 1px;

  /* botones */
  --btn-pad-y: var(--space-4);
  --btn-pad-x: var(--space-6);
  --btn-font-size: 1rem;
  --btn-small-pad-y: var(--space-2);
  --btn-small-pad-x: var(--space-4);
  --btn-small-font-size: 0.875rem;
  --touch-btn-size: 64px;
  --touch-btn-font-size: 0.9rem;
  --touch-btn-bg: #fbfbfb;
  --touch-btn-active-bg: #606060;
  --touch-btn-border: 3px;
  --touch-btn-border-active: 5px;
  --touch-btn-border-color: #f0f0f0;
  --touch-btn-border-active-color: #4a4a4a;
  --touch-btn-shadow-light: var(--white);
  --touch-btn-shadow-dark: #565656;

  /* header + stats */
  --game-header-inset: var(--space-4);
  --game-header-pad: var(--space-4);
  --stats-gap: var(--space-6);
  --stat-label-size: 0.75rem;
  --stat-value-size: 1.25rem;

  /* pantalla final */
  --end-padding: var(--space-6);
  --end-title-size: 2rem;
  --end-title-margin: var(--space-5);
  --end-stats-margin: var(--space-5);
  --end-stat-gap: var(--space-2);
  
  /* colores clásicos de minesweeper */
  --color-1: #00bfff; /* turquesa */
  --color-2: #00ff00; /* verde */
  --color-3: #ff0000; /* rojo */
  --color-4: #ff00ff; /* magenta */
  --color-5: #ff8c00; /* naranja */
  --color-6: #00ffff; /* cyan */
  --color-7: #808080; /* gris */
  --color-8: #000000; /* negro */
  
  /* colores del tablero */
  --cell-unrevealed: #c0c0c0;
  --cell-unrevealed-hover: #d3d3d3;
  --cell-revealed: #f5f5f5;
  --cell-mine: #8b0000;
  --cell-flag: #ffd700;
  --cell-flag-correct: #1f4d2a;
  --cell-flag-correct-text: #27c24c;
  --cell-flag-wrong: #4a4a4a;
  --cell-flag-wrong-text: var(--black);
  --cell-question: #8b5cf6;
  --cell-question-text: var(--black);
  --cell-mine-text: var(--white);
  --cell-bevel: var(--white);
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.container {
  width: 100dvw;
  height: 100dvh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* pantallas */
.screen {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.screen.active {
  opacity: 1;
  pointer-events: all;
}

#gameScreen {
  min-width: 70dvw;
}

/* logo */
.logo {
  width: var(--logo-size);
  height: var(--logo-size);
  cursor: pointer;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

/* menú */
.menu {
  display: flex;
  flex-direction: row;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* botones */
.btn {
  padding: var(--btn-pad-y) var(--btn-pad-x);
  background: var(--card);
  border: 2px solid var(--text);
  border-radius: var(--radius);
  font-size: var(--btn-font-size);
  font-weight: 600;
  font-family: var(--mono);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: lowercase;
}

.btn:hover {
  background: var(--text);
  color: var(--card);
  transform: translateY(-2px);
}

.btn-small {
  padding: var(--btn-small-pad-y) var(--btn-small-pad-x);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--btn-small-font-size);
  font-weight: 600;
  font-family: var(--sans);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-small:hover {
  background: var(--border);
}

#backBtn {
  border: none;
  background: transparent;
  box-shadow: none;
}

#backBtn:hover {
  background: var(--border);
}

/* controles táctiles */
.touch-controls {
  display: none;
  gap: var(--space-3);
  align-items: center;
  justify-content: center;
}

.touch-btn {
  width: var(--touch-btn-size);
  height: var(--touch-btn-size);
  padding: 0;
  border: var(--touch-btn-border) solid var(--touch-btn-border-color);
  background: var(--touch-btn-bg);
  font-size: var(--touch-btn-font-size);
  text-transform: lowercase;
  box-shadow:
    inset -4px -4px 0 var(--touch-btn-shadow-light),
    inset 4px 4px 0 var(--touch-btn-shadow-dark),
    0 3px 0 rgba(0, 0, 0, 0.25);
}

.touch-btn.active {
  border-width: var(--touch-btn-border-active);
  border-color: var(--touch-btn-border-active-color);
  background: var(--touch-btn-active-bg);
  box-shadow:
    inset 4px 4px 0 var(--touch-btn-shadow-dark),
    inset -4px -4px 0 var(--touch-btn-shadow-light);
}

/* header del juego */
.game-header {
  position: absolute;
  top: var(--game-header-inset);
  left: var(--game-header-inset);
  right: var(--game-header-inset);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card);
  padding: var(--game-header-pad);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat-label {
  font-size: var(--stat-label-size);
  color: var(--text-muted);
  text-transform: lowercase;
  font-family: var(--sans);
}

.stat-value {
  font-size: var(--stat-value-size);
  font-weight: 700;
  font-family: var(--mono);
  color: var(--text);
}

/* tablero */
.board {
  display: grid;
  gap: var(--board-gap);
  background: var(--border);
  padding: var(--board-gap);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.cell {
  background: var(--cell-unrevealed);
  border: 2px outset var(--cell-bevel);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.1s ease;
  user-select: none;
}

.cell:hover:not(.revealed):not(.flagged):not(.question) {
  background: var(--cell-unrevealed-hover);
  transform: scale(0.95);
}

.cell.revealed {
  background: var(--cell-revealed);
  border: 1px solid var(--border);
  cursor: default;
}

.cell.flagged {
  background: var(--cell-flag);
  border: 2px inset var(--cell-bevel);
}

.cell.question {
  background: var(--cell-question);
  border: 2px inset var(--cell-bevel);
  color: var(--cell-question-text);
}

.cell.flagged-correct {
  background: var(--cell-flag-correct);
  color: var(--cell-flag-correct-text);
}

.cell.flagged-wrong {
  background: var(--cell-flag-wrong);
  color: var(--cell-flag-wrong-text);
}

.cell.question-correct {
  background: var(--cell-flag-correct);
  color: var(--cell-flag-correct-text);
}

.cell.question-wrong {
  background: var(--cell-flag-wrong);
  color: var(--cell-flag-wrong-text);
}

.cell.mine {
  background: var(--cell-mine);
  color: var(--cell-mine-text);
}

/* colores de números */
.cell[data-number="1"] { color: var(--color-1); }
.cell[data-number="2"] { color: var(--color-2); }
.cell[data-number="3"] { color: var(--color-3); }
.cell[data-number="4"] { color: var(--color-4); }
.cell[data-number="5"] { color: var(--color-5); }
.cell[data-number="6"] { color: var(--color-6); }
.cell[data-number="7"] { color: var(--color-7); }
.cell[data-number="8"] { color: var(--color-8); }

/* pantalla de fin */
.end-overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: all;
  z-index: 5;
}

.end-overlay.active {
  display: flex;
}

.end-message {
  background: var(--card);
  padding: var(--end-padding);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 400px;
}

.end-message h2 {
  font-size: var(--end-title-size);
  margin-bottom: var(--end-title-margin);
  font-family: var(--mono);
  text-transform: lowercase;
}

.end-stats {
  margin-bottom: var(--end-stats-margin);
  font-family: var(--mono);
}

.end-stats p {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--end-stat-gap);
  font-size: 1rem;
}

.end-stats span:first-child {
  color: var(--text-muted);
}

.end-stats span:last-child {
  font-weight: 700;
  color: var(--text);
}

/* branding */
.branding {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.875rem;
  font-weight: 600;
}

.branding a {
  color: var(--text);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.branding a:hover {
  opacity: 0.7;
}

/* responsive */
@media (max-width: 768px) {
  :root {
    --logo-size: 150px;
    --game-header-pad: var(--space-3);
    --stats-gap: var(--space-3);
    --stat-label-size: 0.65rem;
    --stat-value-size: 0.95rem;
  }

  .menu {
    flex-direction: column;
    align-items: center;
  }

  #gameScreen {
    display: grid;
    grid-template-rows: 1fr auto 1fr;
    grid-template-columns: 1fr;
    align-items: center;
    justify-items: center;
  }

  #gameScreen .game-header {
    position: static;
    width: min(70dvw, 520px);
    padding: 0.75rem;
    flex-direction: row;
    gap: 0.75rem;
    justify-content: space-between;
    align-items: center;
    grid-row: 1;
  }

  #gameScreen #board {
    grid-row: 2;
  }

  #gameScreen .touch-controls {
    grid-row: 3;
    display: flex;
    transform: translateY(-8px);
  }

  .stats {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --btn-pad-y: 0.75rem;
    --btn-pad-x: 1.5rem;
    --btn-font-size: 0.875rem;
    --end-padding: var(--space-5);
    --end-title-size: 1.5rem;
  }
}