:root {
  --game-bg: #101316;
  --game-surface: rgba(19, 25, 30, 0.94);
  --game-surface-2: rgba(31, 40, 47, 0.92);
  --game-line: rgba(220, 231, 238, 0.16);
  --game-text: #f4f7f8;
  --game-muted: #b9c7ce;
  --game-primary: #22a6f2;
  --game-primary-strong: #0d7fd1;
  --game-accent: #32d17d;
  --game-warn: #f4bf45;
  --game-danger: #ef5350;
  --game-radius: 8px;
  --game-shadow: 0 14px 38px rgba(0, 0, 0, 0.36);
  --game-font: "Segoe UI", Roboto, Arial, sans-serif;
}

html,
body {
  background:
    linear-gradient(180deg, #151b20 0%, #0f1215 100%);
  color: var(--game-text);
  font-family: var(--game-font);
}

button,
.btn,
select,
input,
textarea {
  font: inherit;
}

button,
.btn {
  min-height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--game-radius);
  background: linear-gradient(180deg, #24313a, #172127);
  color: var(--game-text);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
  cursor: pointer;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease;
}

button:hover,
.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(34, 166, 242, 0.55);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
}

button:active,
.btn:active {
  transform: translateY(0);
  box-shadow: 0 5px 12px rgba(0, 0, 0, 0.2);
}

button:disabled,
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

#controls button,
.controls .btn,
.topbar .controls button,
#hud .controls .btn {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--game-radius);
  background: linear-gradient(180deg, #24313a, #172127);
  color: var(--game-text);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
}

button.primary,
.btn.primary,
#btn-new-game,
#btnRestart,
#restart-btn,
#btn-next-level,
#btnNextLevel,
#btnApplySettings,
#save-score {
  background: linear-gradient(180deg, var(--game-primary), var(--game-primary-strong));
  border-color: rgba(255, 255, 255, 0.18);
  color: #061219;
  font-weight: 800;
}

button.danger,
.btn.danger,
#lb-clear,
#btnResetHS,
#btn-resume-delete {
  background: linear-gradient(180deg, #f06b68, #ca3d3a);
  color: #fff;
}

select,
input[type="text"],
input[type="number"],
textarea {
  border: 1px solid var(--game-line);
  border-radius: var(--game-radius);
  background: rgba(255, 255, 255, 0.05);
  color: var(--game-text);
  outline: none;
}

select:focus,
input:focus,
textarea:focus {
  border-color: rgba(34, 166, 242, 0.85);
  box-shadow: 0 0 0 3px rgba(34, 166, 242, 0.18);
}

option {
  background: #141b20;
  color: var(--game-text);
}

.hidden {
  display: none !important;
}

.topbar,
#controls,
#game-root > #hud {
  background: linear-gradient(180deg, rgba(20, 27, 32, 0.96), rgba(13, 18, 22, 0.94));
  border: 1px solid var(--game-line);
  border-radius: var(--game-radius);
  box-shadow: var(--game-shadow);
}

.topbar,
#controls.topbar,
#hud.topbar {
  position: fixed;
  left: 12px;
  right: 12px;
  top: 12px;
  z-index: 10003;
  width: auto;
  max-width: none;
  margin: 0;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.topbar #hud {
  background: transparent;
  border: 0;
  box-shadow: none;
}

#controls,
.controls,
.topbar .controls,
#hud .controls {
  gap: 8px;
}

.topbar .controls,
#controls.topbar .controls,
#hud.topbar .controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-left: auto;
}

.top-select {
  min-height: 40px;
  padding: 8px 10px;
  border-radius: var(--game-radius);
}

.hud-row,
#hud .status,
.status {
  gap: 8px;
}

.hud-item,
#hud .status > div,
.game-hud-pill {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--game-line);
  border-radius: var(--game-radius);
  background: rgba(255, 255, 255, 0.055);
  color: var(--game-text);
  font-weight: 700;
  white-space: nowrap;
}

.hud-value,
.game-level-value {
  color: var(--game-warn);
  font-weight: 900;
}

.game-level-name {
  color: var(--game-accent);
  font-weight: 800;
}

.game-progress {
  width: 96px;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
}

.game-progress > span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--game-primary), var(--game-accent));
  transition: width 220ms ease;
}

.modal,
.modal-inner,
.over-inner,
.settings {
  border: 1px solid var(--game-line);
  border-radius: var(--game-radius);
  background: linear-gradient(180deg, rgba(21, 28, 33, 0.98), rgba(12, 17, 21, 0.98));
  color: var(--game-text);
  box-shadow: var(--game-shadow);
}

.modal h2,
.modal h3,
.modal-inner h3,
.settings h3 {
  color: var(--game-text);
}

.modal label,
.settings label,
.modal .hs-meta,
.modal-notice {
  color: var(--game-muted);
}

.modal-actions,
.setting-actions,
.over-actions {
  gap: 8px;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 10px 0;
}

.settings-row {
  display: block;
  margin-top: 10px;
}

.overlay,
.modal-overlay,
#settings-modal,
#leaderboard-modal,
#game-over {
  backdrop-filter: blur(6px);
}

#timer,
#progress,
#preloadBar {
  border-radius: 999px;
}

#progress {
  background: linear-gradient(90deg, var(--game-primary), var(--game-accent), var(--game-warn));
}

canvas,
#board,
.tile {
  border-radius: var(--game-radius);
}

.tile {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.tile.selected {
  outline-color: rgba(34, 166, 242, 0.9);
  box-shadow: 0 0 0 4px rgba(34, 166, 242, 0.16);
}

@media (max-width: 720px) {
  button,
  .btn {
    min-height: 38px;
    padding: 8px 10px;
  }

  .hud-item,
  #hud .status > div,
  .game-hud-pill {
    min-height: 34px;
    padding: 7px 9px;
    font-size: 13px;
  }

  .game-progress {
    width: 72px;
  }
}

/* Shared finishing pass for game surfaces. */
.topbar .controls button,
.topbar .controls select,
#controls.topbar button,
#controls.topbar select,
#hud.topbar button,
#hud.topbar select {
  min-height: 42px;
}

.topbar .controls button,
#controls.topbar button,
#hud.topbar button {
  font-weight: 800;
}

.modal input,
.modal-inner input,
.over-inner input,
.settings input[type="text"],
.settings input[type="number"] {
  min-height: 40px;
  padding: 8px 10px;
}

.modal input[type="checkbox"],
.modal-inner input[type="checkbox"],
.settings input[type="checkbox"] {
  min-height: 0;
}

#leaderboard-list,
#highscores,
.hs-list {
  scrollbar-width: thin;
  scrollbar-color: rgba(34, 166, 242, 0.8) rgba(255, 255, 255, 0.08);
}

@media (max-width: 560px) {
  .topbar,
  #controls.topbar,
  #hud.topbar {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    border-radius: 0;
  }

  .topbar .controls button,
  .topbar .controls select,
  #controls.topbar button,
  #controls.topbar select,
  #hud.topbar button,
  #hud.topbar select {
    flex: 1 1 120px;
  }

  .modal-actions button,
  .setting-actions button,
  .over-actions button {
    flex: 1 1 120px;
  }
}