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

:root {
  --bg-color: #0f0f17;
  --text-color: #e0e0e0;
  --title-color: #7aa2f7;
  --title-shadow: rgba(122, 162, 247, 0.5);
  --board-border: #2a2a3a;
  --board-bg: #1a1a25;
  --grid-line-color: #22222e;
  --label-color: #555570;
  --value-color: #7aa2f7;
  --controls-color: #888;
  --kbd-bg: #22223a;
  --kbd-border: #3a3a5a;
  --kbd-color: #aaa;
  --overlay-bg: rgba(10, 10, 20, 0.75);
  --overlay-title-color: #e57373;
  --overlay-score-color: #7aa2f7;
  --restart-bg: #7aa2f7;
  --restart-color: #0f0f17;
  --restart-hover: #9bbdff;
  --toggle-bg: #22223a;
  --toggle-border: #3a3a5a;
  --toggle-knob: #7aa2f7;
  --record-accent: #ffd54f;
  --record-row-bg: rgba(255, 238, 88, 0.16);
}

body.light {
  --bg-color: #f2f3f7;
  --text-color: #2b2b38;
  --title-color: #3a5fcd;
  --title-shadow: rgba(58, 95, 205, 0.25);
  --board-border: #ccccdc;
  --board-bg: #ffffff;
  --grid-line-color: #e2e2ec;
  --label-color: #8888a0;
  --value-color: #3a5fcd;
  --controls-color: #666677;
  --kbd-bg: #e6e6f0;
  --kbd-border: #ccccdc;
  --kbd-color: #444455;
  --overlay-bg: rgba(240, 240, 248, 0.85);
  --overlay-title-color: #d32f2f;
  --overlay-score-color: #3a5fcd;
  --restart-bg: #3a5fcd;
  --restart-color: #ffffff;
  --restart-hover: #5a7ee0;
  --toggle-bg: #e6e6f0;
  --toggle-border: #ccccdc;
  --toggle-knob: #3a5fcd;
  --record-accent: #a56a00;
  --record-row-bg: rgba(255, 193, 7, 0.18);
}

body {
  background: var(--bg-color);
  color: var(--text-color);
  font-family: system-ui, -apple-system, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  user-select: none;
  transition: background 0.2s, color 0.2s;
}

.wrapper {
  position: relative;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.game-title {
  text-align: center;
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 8px;
  color: var(--title-color);
  text-shadow: 0 0 20px var(--title-shadow);
}

.game-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  box-shadow: 0 0 16px var(--title-shadow);
}

.title-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.1;
}

.game-subtitle {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--controls-color);
}

/* ---- Theme toggle ---- */
.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.theme-toggle .label {
  color: var(--controls-color);
}

.switch {
  position: relative;
  display: inline-block;
  width: 42px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch .slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  border-radius: 22px;
  transition: background 0.2s, border-color 0.2s;
}

.switch .slider::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  top: 2px;
  background: var(--toggle-knob);
  border-radius: 50%;
  transition: transform 0.2s;
}

.switch input:checked + .slider::before {
  transform: translateX(20px);
}

/* ---- Selector de skin ---- */
.skin-picker {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.skin-picker .label {
  color: var(--controls-color);
}

#skin-select {
  background: var(--toggle-bg);
  color: var(--text-color);
  border: 1px solid var(--toggle-border);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
}

#skin-select:focus-visible {
  outline: 2px solid var(--toggle-knob);
  outline-offset: 1px;
}

/* Ajustes de página por skin (el fondo de los canvas lo pinta game.js) */
body.skin-neon #board,
body.skin-neon #next-canvas,
body.skin-neon #hold-canvas {
  background: #000;
  border-color: #00f0ff;
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.45), inset 0 0 12px rgba(0, 240, 255, 0.15);
}

body.skin-neon .game-title {
  color: #00f0ff;
  text-shadow: 0 0 8px #00f0ff, 0 0 24px #d500f9;
}

body.skin-pastel #board,
body.skin-pastel #next-canvas,
body.skin-pastel #hold-canvas {
  background: #2e2a3e;
  border-color: #b8a9d9;
  border-radius: 12px;
}

body.skin-pastel .game-title {
  color: #f7b2b7;
  text-shadow: 0 0 16px rgba(215, 184, 243, 0.6);
}

body.skin-pixel #board,
body.skin-pixel #next-canvas,
body.skin-pixel #hold-canvas {
  background: #141428;
  border: 3px solid #bcbcbc;
  border-radius: 0;
  image-rendering: pixelated;
}

body.skin-pixel .game-title {
  font-family: 'Courier New', Courier, monospace;
  color: #f8b800;
  text-shadow: 3px 3px 0 #f83800;
}

.game-container {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

#board {
  display: block;
  border: 1px solid var(--board-border);
  background: var(--board-bg);
  border-radius: 4px;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.6);
}

/* ---- Panel lateral ---- */
.panel {
  width: 160px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 4px;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--label-color);
  font-weight: 600;
}

.value {
  font-family: 'Courier New', Courier, monospace;
  font-size: 26px;
  font-weight: 700;
  color: var(--value-color);
  letter-spacing: 1px;
}

.combo-value {
  color: #ffee58;
}

#next-canvas,
#hold-canvas {
  display: block;
  border: 1px solid var(--board-border);
  background: var(--board-bg);
  border-radius: 4px;
}

#hold-section {
  transition: opacity 0.2s ease, filter 0.2s ease;
}

#hold-section.locked {
  opacity: 0.35;
  filter: grayscale(1);
}

/* ---- Barra de energía ---- */
.energy-bar {
  width: 100%;
  height: 14px;
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 7px;
  overflow: hidden;
}

.energy-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--title-color), #4dd0e1);
  transition: width 0.2s ease-out;
}

.energy-fill.full {
  animation: energy-pulse 0.6s ease-in-out infinite alternate;
}

@keyframes energy-pulse {
  from { filter: brightness(1); }
  to { filter: brightness(1.7); box-shadow: 0 0 12px #ffd54f; }
}

/* ---- Preview extendido ---- */
.preview-list {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.preview-chip {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

/* ---- Controles ---- */
.controls ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.controls li {
  font-size: 12px;
  color: var(--controls-color);
  display: flex;
  align-items: center;
  gap: 4px;
}

kbd {
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 3px;
  padding: 1px 6px;
  font-size: 11px;
  font-family: inherit;
  color: var(--kbd-color);
}

/* ---- Overlay ---- */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--overlay-bg);
  backdrop-filter: blur(4px);
  border-radius: 4px;
}

.overlay.hidden {
  display: none;
}

.overlay-box {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

#overlay-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--overlay-title-color);
}

#overlay-score {
  font-family: 'Courier New', Courier, monospace;
  font-size: 18px;
  font-weight: 700;
  color: var(--overlay-score-color);
}

#restart-btn {
  background: var(--restart-bg);
  color: var(--restart-color);
  border: none;
  border-radius: 6px;
  padding: 10px 28px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 1px;
  transition: background 0.15s;
}

#restart-btn:hover {
  background: var(--restart-hover);
}

.overlay-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

#change-mode-btn {
  background: transparent;
  color: var(--restart-bg);
  border: 1px solid var(--restart-bg);
  border-radius: 6px;
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: background 0.15s, color 0.15s;
}

#change-mode-btn:hover {
  background: var(--restart-bg);
  color: var(--restart-color);
}

/* ---- Desafío HUD ---- */
.challenge-hud.hidden {
  display: none;
}

.challenge-name {
  font-size: 14px !important;
  letter-spacing: 0.5px;
}

.challenge-progress {
  font-family: 'Courier New', Courier, monospace;
  font-size: 11px;
  color: var(--controls-color);
}

/* ---- Selección de desafío ---- */
.challenge-select-box {
  max-width: 640px;
  padding: 12px;
}

.start-layout {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.start-modes {
  width: 340px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.challenge-select-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--title-color);
  margin-bottom: 6px;
}

.challenge-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 60vh;
  overflow-y: auto;
}

.challenge-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 6px;
  padding: 10px 14px;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}

.challenge-item:hover {
  border-color: var(--restart-bg);
  background: var(--toggle-bg);
}

.challenge-item-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--value-color);
}

.challenge-item-desc {
  font-size: 11px;
  color: var(--controls-color);
}

/* ---- Menú de habilidades ---- */
.ability-box {
  max-width: 320px;
  padding: 0 24px;
}

.ability-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--overlay-score-color);
}

.ability-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
  text-align: left;
  width: 100%;
}

.ability-list li {
  display: flex;
  gap: 8px;
  align-items: center;
  cursor: pointer;
  padding: 8px 10px;
  border-radius: 6px;
  background: rgba(122, 162, 247, 0.08);
  color: var(--text-color);
  font-size: 13px;
  transition: background 0.15s;
}

.ability-list li:hover {
  background: rgba(122, 162, 247, 0.22);
}

/* ---- Menú de pausa ---- */
.pause-view.hidden {
  display: none;
}

.pause-box {
  min-width: 260px;
}

.pause-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--title-color);
}

.pause-view {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.pause-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  background: var(--kbd-bg);
  color: var(--text-color);
  border: 1px solid var(--kbd-border);
  border-radius: 6px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.pause-item:focus {
  outline: none;
}

.pause-item.selected {
  border-color: var(--restart-bg);
  background: var(--restart-bg);
  color: var(--restart-color);
}

.pause-level {
  justify-content: space-between;
  cursor: default;
}

.level-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.level-btn {
  background: transparent;
  color: inherit;
  border: 1px solid currentColor;
  border-radius: 4px;
  width: 24px;
  height: 24px;
  font-size: 10px;
  cursor: pointer;
  line-height: 1;
}

.level-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.level-value {
  font-family: 'Courier New', Courier, monospace;
  font-size: 18px;
  min-width: 24px;
  text-align: center;
}

.pause-hint {
  font-size: 11px;
  color: var(--controls-color);
}

.pause-controls-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
  margin-bottom: 6px;
}

.pause-controls-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-color);
}

.pause-controls-list li > span:first-child {
  display: inline-flex;
  gap: 3px;
  min-width: 96px;
  justify-content: flex-end;
  color: var(--controls-color);
}

.pause-nav-hint {
  font-size: 11px;
  color: var(--controls-color);
  margin-top: 4px;
}

/* ---- Tabla de récords ---- */
.records {
  width: 260px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 14px;
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 6px;
}

.records.hidden,
.record-entry.hidden,
.record-form.hidden {
  display: none;
}

.records-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--title-color);
}

.records-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.records-row {
  display: grid;
  grid-template-columns: 18px 1fr auto;
  column-gap: 8px;
  align-items: baseline;
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-color);
}

.records-pos {
  font-weight: 700;
  color: var(--label-color);
}

.records-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.records-score {
  font-family: 'Courier New', Courier, monospace;
  font-weight: 700;
  color: var(--value-color);
}

.records-detail {
  grid-column: 2 / 4;
  font-size: 10px;
  color: var(--controls-color);
}

.records-row.highlight {
  background: var(--record-row-bg);
  outline: 1px solid var(--record-accent);
  animation: record-pulse 0.8s ease-in-out infinite alternate;
}

.records-row.highlight .records-pos,
.records-row.highlight .records-score {
  color: var(--record-accent);
}

@keyframes record-pulse {
  from { box-shadow: 0 0 0 rgba(255, 238, 88, 0); }
  to { box-shadow: 0 0 10px rgba(255, 238, 88, 0.45); }
}

.records-empty {
  font-size: 12px;
  color: var(--controls-color);
  padding: 4px 0;
}

.records-stats {
  font-family: 'Courier New', Courier, monospace;
  font-size: 11px;
  color: var(--controls-color);
  text-align: left;
}

.records-reset-btn {
  align-self: flex-start;
  background: transparent;
  color: var(--overlay-title-color);
  border: 1px solid var(--overlay-title-color);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.records-reset-btn:hover {
  background: var(--overlay-title-color);
  color: var(--bg-color);
}

.record-entry {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.record-msg {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--controls-color);
  white-space: pre-line;
}

.record-msg.new {
  color: var(--record-accent);
}

.record-form {
  display: flex;
  gap: 6px;
}

#record-name {
  width: 150px;
  background: var(--board-bg);
  color: var(--text-color);
  border: 1px solid var(--kbd-border);
  border-radius: 4px;
  padding: 6px 8px;
  font-size: 13px;
  font-family: inherit;
  user-select: text;
}

#record-name:focus {
  outline: none;
  border-color: var(--restart-bg);
}

#record-save-btn {
  background: var(--restart-bg);
  color: var(--restart-color);
  border: none;
  border-radius: 4px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

#record-save-btn:hover {
  background: var(--restart-hover);
}