:root {
  --bg-top: #4F8EF7;
  --bg-bottom: #A55CF0;
  --game-bg-top: #1B1F3B;
  --game-bg-bottom: #3A2C5C;

  --accent-yellow: #FFD93D;
  --correct-green: #29C46F;
  --wrong-red: #FF5A5F;

  --text-primary: #FFFFFF;
  --text-secondary: #D8D8F0;

  --card-bg: #FFFFFF;
  --card-text: #2D2360;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #000;
}

.screen {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* ============ HOME SCREEN ============ */

.home-screen {
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, var(--bg-top), var(--bg-bottom));
}

.home-header {
  padding: 28px 28px 0 28px;
  flex-shrink: 0;
}

.home-header h1 {
  margin: 0;
  color: var(--text-primary);
  font-size: 36px;
  font-weight: 800;
}

.tagline {
  margin: 4px 0 0 0;
  color: var(--text-secondary);
  font-size: 16px;
}

.tab-row {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.tab {
  padding: 12px 20px;
  border-radius: 24px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  user-select: none;
}

.tab.selected {
  background: var(--card-bg);
  color: var(--card-text);
}

.home-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 0 28px 28px 28px;
}

.level-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 20px;
}

.level-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  border: none;
  text-align: left;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15);
  transition: transform 0.08s ease;
}

.level-card:active {
  transform: scale(0.98);
}

.level-card-text {
  flex: 1;
  min-width: 0;
}

.level-name {
  margin: 0;
  color: var(--card-text);
  font-size: 22px;
  font-weight: 700;
}

.level-desc {
  margin: 4px 0 0 0;
  color: var(--card-text);
  opacity: 0.65;
  font-size: 15px;
}

.level-best {
  color: var(--card-text);
  opacity: 0.5;
  font-size: 14px;
  white-space: nowrap;
}

.level-play-icon {
  width: 0;
  height: 0;
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  border-left: 20px solid var(--bg-bottom);
  flex-shrink: 0;
}

/* ============ GAME SCREENS (shared) ============ */

.game-screen, .race-screen {
  background: var(--game-bg-top);
  display: flex;
  flex-direction: column;
}

.hud {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px;
  flex-shrink: 0;
  z-index: 5;
}

.hud-level {
  flex: 1;
  color: var(--text-secondary);
  font-size: 18px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hud-combo {
  color: var(--accent-yellow);
  font-weight: 700;
  font-size: 18px;
  min-width: 90px;
}

.hud-score, .hud-time {
  color: var(--text-primary);
  font-weight: 700;
  font-size: 20px;
}

.hud-time { color: var(--text-secondary); font-weight: 400; }

.hud-lives {
  color: var(--wrong-red);
  font-weight: 700;
  font-size: 20px;
}

.hud-accuracy { color: var(--text-primary); font-weight: 700; font-size: 20px; }
.hud-wpm { color: var(--accent-yellow); font-weight: 700; font-size: 20px; }

.icon-button {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pause-icon {
  width: 4px;
  height: 16px;
  background: var(--text-primary);
  box-shadow: 8px 0 0 var(--text-primary);
}

.icon-button:active {
  background: rgba(255, 255, 255, 0.15);
}

.stage {
  flex: 1;
  position: relative;
  min-height: 0;
}

#gameCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ============ TYPING RACE ============ */

.race-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 48px;
  gap: 20px;
}

.race-progress {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}

.sentence-card {
  background: var(--card-bg);
  border-radius: 24px;
  padding: 36px;
  width: 100%;
  max-width: 1000px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.sentence-text {
  margin: 0;
  font-family: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 30px;
  line-height: 1.5;
  color: var(--card-text);
  word-spacing: 0.1em;
}

.sentence-text .typed { color: var(--correct-green); }
.sentence-text .cursor { background: var(--accent-yellow); color: var(--card-text); }
.sentence-text .cursor.mistake { background: var(--wrong-red); color: #fff; }

/* ============ OVERLAYS ============ */

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

#gameOverOverlay, #sessionCompleteOverlay {
  background: rgba(0, 0, 0, 0.75);
}

.panel {
  width: 320px;
  background: #2D2360;
  border-radius: 32px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.panel h2 {
  margin: 0;
  color: var(--text-primary);
  font-size: 28px;
  font-weight: 700;
}

.panel-score {
  margin: 12px 0 0 0;
  color: var(--accent-yellow);
  font-size: 22px;
}

.panel-best {
  margin: 4px 0 0 0;
  color: var(--correct-green);
  font-weight: 700;
}

.btn {
  width: 100%;
  border: none;
  border-radius: 28px;
  padding: 16px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
  margin-top: 12px;
}

.btn-primary {
  background: var(--accent-yellow);
  color: var(--card-text);
  margin-top: 24px;
}

.btn-text {
  background: transparent;
  color: var(--text-secondary);
}

[hidden] { display: none !important; }