/* ── TMNT Shell Smash! ── */

:root {
  --leo-blue: #2962ff;
  --raph-red: #d32f2f;
  --donnie-purple: #7b1fa2;
  --mikey-orange: #ff8f00;
  --ooze-green: #00e676;
  --sewer-dark: #0d1a0f;
  --sewer-mid: #162a18;
  --sewer-light: #1f3d22;
  --text-main: #e0f7e0;
  --text-dim: #5a8a5e;
  --accent: #00e676;
  --board-bg: #0a140c;
  --tile-bg: #162a18;
  --tile-border: #2e5432;
}

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

body {
  background: var(--sewer-dark);
  color: var(--text-main);
  font-family: 'Rubik', 'Segoe UI', sans-serif;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.8s ease;
}

/* ── Sewer texture background ── */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background:
    repeating-linear-gradient(
      0deg,
      transparent 0px,
      transparent 38px,
      rgba(0, 230, 118, 0.03) 38px,
      rgba(0, 230, 118, 0.03) 40px
    ),
    repeating-linear-gradient(
      90deg,
      transparent 0px,
      transparent 38px,
      rgba(0, 230, 118, 0.03) 38px,
      rgba(0, 230, 118, 0.03) 40px
    ),
    radial-gradient(ellipse at 50% 100%, rgba(0,230,118,0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

#app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 500px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Screens ── */
.screen {
  display: none;
  width: 100%;
  padding: 20px;
}

.screen.active {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Title Screen ── */
.title-content {
  text-align: center;
  width: 100%;
}

.turtle-heads {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.turtle-icon {
  font-size: 2.2rem;
  display: inline-flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 3px solid;
  transition: transform 0.3s;
}

.turtle-icon:hover { transform: scale(1.15) rotate(-8deg); }

.turtle-icon.leo { border-color: var(--leo-blue); background: rgba(41,98,255,0.15); }
.turtle-icon.raph { border-color: var(--raph-red); background: rgba(211,47,47,0.15); }
.turtle-icon.donnie { border-color: var(--donnie-purple); background: rgba(123,31,162,0.15); }
.turtle-icon.mikey { border-color: var(--mikey-orange); background: rgba(255,143,0,0.15); }

.game-title {
  font-family: 'Bangers', cursive;
  font-size: 3.2rem;
  letter-spacing: 4px;
  color: var(--ooze-green);
  text-shadow:
    0 0 20px rgba(0,230,118,0.4),
    3px 3px 0 rgba(0,0,0,0.5);
  margin-bottom: 2px;
}

.game-subtitle {
  font-family: 'Rubik', sans-serif;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-dim);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.game-tagline {
  font-size: 0.8rem;
  color: var(--mikey-orange);
  font-style: italic;
  margin-bottom: 28px;
}

/* ── Buttons ── */
.tmnt-btn {
  display: block;
  width: 100%;
  max-width: 280px;
  margin: 8px auto;
  padding: 14px 24px;
  font-family: 'Bangers', cursive;
  font-size: 1.2rem;
  letter-spacing: 3px;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
}

.tmnt-btn.primary {
  background: var(--ooze-green);
  color: #0d1a0f;
  border-radius: 6px;
  box-shadow: 0 4px 15px rgba(0,230,118,0.3);
}

.tmnt-btn.primary:hover {
  background: #69f0ae;
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0,230,118,0.4);
}

.tmnt-btn.outline {
  background: transparent;
  color: var(--ooze-green);
  border: 2px solid var(--ooze-green);
  border-radius: 6px;
}

.tmnt-btn.outline:hover {
  background: rgba(0,230,118,0.1);
}

.tmnt-btn:active { transform: scale(0.97); }

/* ── How to Play ── */
.howto-content {
  width: 100%;
  max-width: 420px;
}

.howto-content h2 {
  font-family: 'Bangers', cursive;
  font-size: 1.8rem;
  color: var(--ooze-green);
  letter-spacing: 4px;
  text-align: center;
  margin-bottom: 16px;
}

.howto-body {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.howto-body p { margin-bottom: 10px; }
.howto-body strong { color: var(--text-main); }

.howto-body ul {
  list-style: none;
  margin: 8px 0;
}

.howto-body li {
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.gem-preview {
  font-size: 1.2rem;
  width: 28px;
  text-align: center;
}

/* ── Game Screen ── */
.game-layout {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── HUD ── */
.game-hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 400px;
  padding: 8px 0;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--tile-border);
}

.hud-block {
  text-align: center;
  min-width: 80px;
}

.hud-block.center { flex: 1; }

.hud-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 3px;
  font-weight: 800;
}

.hud-value {
  font-family: 'Bangers', cursive;
  font-size: 1.8rem;
  color: var(--ooze-green);
  letter-spacing: 2px;
}

.hud-value.combo {
  color: var(--mikey-orange);
  font-size: 1.4rem;
  min-height: 1.4em;
  transition: transform 0.1s;
}

.hud-value.combo.flash {
  animation: comboFlash 0.6s ease-out;
}

.hud-value.combo.flash-big {
  animation: comboFlashBig 0.8s ease-out;
}

@keyframes comboFlash {
  0%   { transform: scale(1.8); text-shadow: 0 0 12px currentColor; }
  40%  { transform: scale(1.3); }
  100% { transform: scale(1); text-shadow: none; }
}

@keyframes comboFlashBig {
  0%   { transform: scale(2.4); text-shadow: 0 0 20px currentColor, 0 0 40px currentColor; }
  30%  { transform: scale(1.6); }
  60%  { transform: scale(1.2); text-shadow: 0 0 8px currentColor; }
  100% { transform: scale(1); text-shadow: none; }
}

/* ── Level Bar ── */
.hud-level-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  max-width: 400px;
  padding: 4px 0 2px;
}

.hud-level-name {
  font-family: 'Bangers', cursive;
  font-size: 0.85rem;
  letter-spacing: 4px;
  color: var(--accent);
  transition: color 0.6s;
}

.hud-level-pips {
  display: flex;
  gap: 5px;
}

.hud-level-pips .pip {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--text-dim);
  background: transparent;
  transition: background 0.4s, border-color 0.4s, box-shadow 0.4s;
}

.hud-level-pips .pip.active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

/* ── Goal Bar ── */
.goal-bar {
  width: 100%;
  max-width: 400px;
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  margin-bottom: 10px;
  overflow: hidden;
}

.goal-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.4s ease, background 0.4s;
  box-shadow: 0 0 6px var(--accent);
}

.hud-value.goal {
  font-size: 1.3rem;
}

/* ── Board ── */
.board-container {
  background: var(--board-bg);
  border: 3px solid var(--tile-border);
  border-radius: 8px;
  padding: 4px;
  box-shadow:
    0 0 30px rgba(0,230,118,0.05),
    inset 0 0 20px rgba(0,0,0,0.5);
  touch-action: none;
  transition: border-color 0.8s, box-shadow 0.8s;
}

#game-canvas {
  display: block;
  border-radius: 4px;
}

/* ── Results ── */
.results-content {
  text-align: center;
  width: 100%;
}

.results-content h2 {
  font-family: 'Bangers', cursive;
  font-size: 2.4rem;
  color: var(--ooze-green);
  letter-spacing: 4px;
  margin-bottom: 16px;
  text-shadow: 0 0 20px rgba(0,230,118,0.3);
}

.results-score-area {
  margin-bottom: 8px;
}

.results-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 3px;
  font-weight: 800;
}

.results-score {
  font-family: 'Bangers', cursive;
  font-size: 3rem;
  color: var(--ooze-green);
  letter-spacing: 4px;
  text-shadow: 0 0 30px rgba(0,230,118,0.4);
}

.results-rank {
  font-family: 'Bangers', cursive;
  font-size: 1.3rem;
  color: var(--mikey-orange);
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.results-stats {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  letter-spacing: 1px;
}

/* ── Responsive ── */
@media (max-width: 420px) {
  .game-title { font-size: 2.4rem; }
  .turtle-icon { width: 42px; height: 42px; font-size: 1.6rem; }
}