/* Theme system: color palette + dark mode + settings panel */

:root {
  --page-bg: #faf8ef;
  --text-color: #776e65;
  --link-color: #776e65;
  --hr-color: #d8d4d0;
  --board-bg: #bbada0;
  --cell-bg: #cdc1b4;
  --cell-shadow: inset 0 2px 5px rgba(90, 80, 70, 0.35), inset 0 -1px 0 rgba(255, 255, 255, 0.22);
  --combo-color: #f65e3b;
  --combo-color-hot: #edc22e;
  --score-label: #eee4da;
  --score-addition: rgba(119, 110, 101, 0.9);
  --button-bg: #8f7a66;
  --button-text: #f9f6f2;
  --message-bg: rgba(238, 228, 218, 0.73);
  --message-text: #776e65;
  --message-win-bg: rgba(237, 194, 46, 0.55);
  --message-win-text: #f9f6f2;
  --panel-bg: #ffffff;
  --panel-border: rgba(119, 110, 101, 0.18);
  --panel-shadow: 0 12px 40px rgba(60, 50, 40, 0.18);
  --control-bg: #8f7a66;
  --control-hover: #7a6856;
  --swatch-ring: #776e65;
  --tile-text-dark: #776e65;
  --tile-text-light: #f9f6f2;
  --joker-tray-bg: #f3efe6;
  --joker-tray-border: rgba(119, 110, 101, 0.1);
  --joker-tray-shadow: 0 4px 16px rgba(60, 50, 40, 0.06);
  --joker-btn-bg: #e4d8c4;
  --joker-btn-hover: #d7c7ad;
  --joker-icon-color: #ffffff;
  --joker-charge-filled: #776e65;
  --joker-charge-empty: rgba(119, 110, 101, 0.18);
  --joker-tooltip-bg: #5c534a;
}

html[data-theme="bloom"] {
  --page-bg: #fbf5fa;
  --text-color: #6b4a6e;
  --link-color: #6b4a6e;
  --hr-color: #e8d5e6;
  --board-bg: #9e7eb8;
  --cell-bg: #b89ac8;
  --cell-shadow: inset 0 2px 5px rgba(70, 40, 90, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.2);
  --combo-color: #e85aad;
  --combo-color-hot: #8f36de;
  --score-label: #efe0f8;
  --score-addition: rgba(107, 74, 110, 0.9);
  --button-bg: #b45aa0;
  --button-text: #fff7fc;
  --message-bg: rgba(250, 230, 245, 0.78);
  --message-text: #6b4a6e;
  --message-win-bg: rgba(160, 80, 200, 0.55);
  --message-win-text: #fff7fc;
  --panel-bg: #fff8fc;
  --panel-border: rgba(180, 90, 160, 0.22);
  --panel-shadow: 0 12px 40px rgba(120, 50, 110, 0.16);
  --control-bg: #b45aa0;
  --control-hover: #9a4a88;
  --swatch-ring: #b45aa0;
  --joker-tray-bg: #f7eaf4;
  --joker-tray-border: rgba(180, 90, 160, 0.14);
  --joker-tray-shadow: 0 4px 16px rgba(120, 50, 110, 0.08);
  --joker-btn-bg: #d9b3d4;
  --joker-btn-hover: #c99ac3;
  --joker-icon-color: #ffffff;
  --joker-charge-filled: #6b4a6e;
  --joker-charge-empty: rgba(107, 74, 110, 0.18);
  --joker-tooltip-bg: #5a3d5c;
}

html[data-mode="dark"] {
  --page-bg: #16141c;
  --text-color: #d8d2c8;
  --link-color: #e4ddd2;
  --hr-color: #3a3644;
  --board-bg: #3d3848;
  --cell-bg: #2a2633;
  --cell-shadow: inset 0 3px 6px rgba(0, 0, 0, 0.55), inset 0 -1px 0 rgba(255, 255, 255, 0.06);
  --combo-color: #f67c5f;
  --combo-color-hot: #edc22e;
  --score-label: #b8b0a4;
  --score-addition: rgba(232, 220, 200, 0.9);
  --button-bg: #6b5f52;
  --button-text: #f5f0e8;
  --message-bg: rgba(16, 14, 22, 0.9);
  --message-text: #f3eee6;
  --message-win-bg: rgba(180, 140, 40, 0.62);
  --message-win-text: #fff8e8;
  --panel-bg: #221f2b;
  --panel-border: rgba(255, 255, 255, 0.1);
  --panel-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  --control-bg: #6b5f52;
  --control-hover: #7d7164;
  --swatch-ring: #d8d2c8;
  --tile-text-dark: #3c3640;
  --joker-tray-bg: #2a2633;
  --joker-tray-border: rgba(255, 255, 255, 0.08);
  --joker-tray-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
  --joker-btn-bg: #4a4456;
  --joker-btn-hover: #5a5468;
  --joker-icon-color: #ffffff;
  --joker-charge-filled: #d8d2c8;
  --joker-charge-empty: rgba(216, 210, 200, 0.2);
  --joker-tooltip-bg: #3a3644;
}

html[data-theme="bloom"][data-mode="dark"] {
  --page-bg: #17121c;
  --text-color: #e8d5ea;
  --link-color: #f0d8f2;
  --hr-color: #3d2f42;
  --board-bg: #4a3550;
  --cell-bg: #342038;
  --cell-shadow: inset 0 3px 6px rgba(0, 0, 0, 0.55), inset 0 -1px 0 rgba(255, 180, 230, 0.08);
  --combo-color: #ff4d8d;
  --combo-color-hot: #c040ff;
  --score-label: #d8b8d4;
  --score-addition: rgba(240, 200, 235, 0.9);
  --button-bg: #9a4a8e;
  --button-text: #fff5fb;
  --message-bg: rgba(18, 10, 24, 0.92);
  --message-text: #fbeaf7;
  --message-win-bg: rgba(150, 70, 200, 0.62);
  --message-win-text: #fff5fb;
  --panel-bg: #241828;
  --panel-border: rgba(220, 140, 200, 0.18);
  --panel-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  --control-bg: #9a4a8e;
  --control-hover: #b055a0;
  --swatch-ring: #e8b8e0;
  --joker-tray-bg: #2a1c30;
  --joker-tray-border: rgba(220, 140, 200, 0.14);
  --joker-tray-shadow: 0 6px 18px rgba(0, 0, 0, 0.32);
  --joker-btn-bg: #5a3a58;
  --joker-btn-hover: #6c4868;
  --joker-icon-color: #ffffff;
  --joker-charge-filled: #e8b8e0;
  --joker-charge-empty: rgba(232, 184, 224, 0.2);
  --joker-tooltip-bg: #3a243c;
}

html, body {
  background: var(--page-bg);
  color: var(--text-color);
  transition: background-color 220ms ease, color 220ms ease;
}

a {
  color: var(--link-color);
}

hr {
  border-bottom-color: var(--hr-color);
}

.score-container,
.best-container {
  background: var(--board-bg);
}

.score-container:after,
.best-container:after {
  color: var(--score-label);
}

.score-container .score-addition,
.best-container .score-addition {
  color: var(--score-addition);
}

.game-container {
  background: var(--board-bg);
}

.grid-cell {
  background: var(--cell-bg);
  box-shadow: var(--cell-shadow);
}

.restart-button,
.game-message a {
  background: var(--button-bg);
  color: var(--button-text);
}

.game-container .game-message {
  background: var(--message-bg);
  color: var(--message-text, var(--text-color));
  backdrop-filter: blur(2px);
}

.game-container .game-message p {
  color: var(--message-text, var(--text-color));
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

.game-container .game-message.game-won {
  background: var(--message-win-bg);
  color: var(--message-win-text, var(--button-text));
}

.game-container .game-message.game-won p {
  color: var(--message-win-text, var(--button-text));
}

.game-container .game-message.game-over {
  background: var(--message-bg);
  color: var(--message-text, var(--text-color));
}

html[data-mode="dark"] .game-container .game-message p {
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}

html[data-mode="dark"] .game-container .game-message a {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
}

/* ---- Bloom tile palette: pink → purple ---- */
html[data-theme="bloom"] .tile .tile-inner {
  color: var(--tile-text-dark);
  background: #ffd6ec;
}

html[data-theme="bloom"] .tile.tile-2 .tile-inner {
  background: #ffe3f2;
  box-shadow: none;
}

html[data-theme="bloom"] .tile.tile-4 .tile-inner {
  background: #ffc4e4;
  box-shadow: none;
}

html[data-theme="bloom"] .tile.tile-8 .tile-inner {
  color: var(--tile-text-light);
  background: #ff9ad0;
}

html[data-theme="bloom"] .tile.tile-16 .tile-inner {
  color: var(--tile-text-light);
  background: #f577bc;
}

html[data-theme="bloom"] .tile.tile-32 .tile-inner {
  color: var(--tile-text-light);
  background: #e85aad;
}

html[data-theme="bloom"] .tile.tile-64 .tile-inner {
  color: var(--tile-text-light);
  background: #d445b0;
}

html[data-theme="bloom"] .tile.tile-128 .tile-inner {
  color: var(--tile-text-light);
  background: #c040c8;
  box-shadow: 0 0 30px 10px rgba(192, 64, 200, 0.22), inset 0 0 0 1px rgba(255, 255, 255, 0.14);
}

html[data-theme="bloom"] .tile.tile-256 .tile-inner {
  color: var(--tile-text-light);
  background: #a83dd4;
  box-shadow: 0 0 30px 10px rgba(168, 61, 212, 0.28), inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}

html[data-theme="bloom"] .tile.tile-512 .tile-inner {
  color: var(--tile-text-light);
  background: #8f36de;
  box-shadow: 0 0 30px 10px rgba(143, 54, 222, 0.34), inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

html[data-theme="bloom"] .tile.tile-1024 .tile-inner {
  color: var(--tile-text-light);
  background: #7630d0;
  box-shadow: 0 0 30px 10px rgba(118, 48, 208, 0.4), inset 0 0 0 1px rgba(255, 255, 255, 0.26);
}

html[data-theme="bloom"] .tile.tile-2048 .tile-inner {
  color: var(--tile-text-light);
  background: #5e28c4;
  box-shadow: 0 0 30px 10px rgba(94, 40, 196, 0.48), inset 0 0 0 1px rgba(255, 255, 255, 0.3);
}

html[data-theme="bloom"] .tile.tile-super .tile-inner {
  color: var(--tile-text-light);
  background: #3a1478;
}

/* Dark mode: soft original tiles stay readable */
html[data-mode="dark"][data-theme="original"] .tile.tile-2 .tile-inner,
html[data-mode="dark"][data-theme="original"] .tile.tile-4 .tile-inner {
  color: var(--tile-text-dark);
}

html[data-mode="dark"][data-theme="original"] .tile.tile-2 .tile-inner {
  background: #e8dcc8;
}

html[data-mode="dark"][data-theme="original"] .tile.tile-4 .tile-inner {
  background: #e0d0b0;
}

/* ---- Settings control (top-right) ---- */
.theme-controls {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  font-family: "Nunito", "Clear Sans", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 12px;
  background: var(--control-bg);
  color: var(--button-text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
  transition: background-color 180ms ease, transform 180ms ease;
}

.theme-toggle:hover {
  background: var(--control-hover);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--swatch-ring);
  outline-offset: 3px;
}

.theme-toggle svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.theme-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 240px;
  padding: 14px;
  border-radius: 14px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  box-shadow: var(--panel-shadow);
  color: var(--text-color);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.98);
  transform-origin: top right;
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
  pointer-events: none;
}

.theme-panel.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.theme-panel-section {
  margin-bottom: 14px;
}

.theme-panel-section:last-child {
  margin-bottom: 0;
}

.theme-panel-label {
  display: block;
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-bottom: 8px;
}

.theme-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.theme-option {
  border: 2px solid transparent;
  border-radius: 10px;
  padding: 8px 6px;
  background: transparent;
  cursor: pointer;
  color: inherit;
  font: inherit;
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.theme-option:hover {
  background: rgba(127, 127, 127, 0.08);
}

.theme-option.is-active {
  border-color: var(--swatch-ring);
}

.theme-swatch {
  display: block;
  height: 28px;
  border-radius: 6px;
  margin-bottom: 6px;
}

.theme-swatch-original {
  background: linear-gradient(90deg, #eee4da 0%, #f2b179 40%, #edc22e 100%);
}

.theme-swatch-bloom {
  background: linear-gradient(90deg, #ffe3f2 0%, #e85aad 45%, #5e28c4 100%);
}

.mode-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  font-weight: bold;
}

.mode-switch {
  position: relative;
  width: 48px;
  height: 28px;
  flex-shrink: 0;
}

.mode-switch input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  cursor: pointer;
  z-index: 2;
}

.mode-switch-track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: rgba(127, 127, 127, 0.28);
  transition: background-color 160ms ease;
}

.mode-switch-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition: transform 160ms ease;
}

.mode-switch input:checked + .mode-switch-track {
  background: var(--control-bg);
}

.mode-switch input:checked + .mode-switch-track .mode-switch-thumb {
  transform: translateX(20px);
}

.mode-switch input:focus-visible + .mode-switch-track {
  outline: 2px solid var(--swatch-ring);
  outline-offset: 2px;
}

@media screen and (max-width: 520px) {
  .theme-controls {
    top: 10px;
    right: 10px;
  }

  .theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 10px;
  }

  .theme-panel {
    width: 220px;
  }
}