* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: radial-gradient(ellipse at top, #9cd4ff 0%, #6eb1e8 40%, #4f8bc2 100%);
  color: #1a2b1a;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  overflow: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 14px;
  max-width: 1000px;
  margin: 0 auto;
}

/* ── HUD ─────────────────────────────────────── */
.hud {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: linear-gradient(180deg, #2d3d24, #1c2818);
  color: #f3f7ea;
  border-radius: 14px;
  box-shadow: 0 6px 0 rgba(0,0,0,0.18), 0 12px 24px rgba(0,0,0,0.25);
  border: 2px solid #14200f;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.3px;
  text-shadow: 0 2px 0 rgba(0,0,0,0.35);
  white-space: nowrap;
}

.logo-small {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 2px 0 rgba(0,0,0,0.25));
}

.logo-big {
  width: 120px;
  height: 120px;
  object-fit: contain;
  margin: 0 auto 4px;
  display: block;
  filter: drop-shadow(0 4px 0 rgba(0,0,0,0.2));
}

.stats {
  display: flex;
  gap: 8px;
  flex: 1;
  justify-content: center;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 10px;
  font-size: 14px;
}

.stat-label { opacity: 0.75; }
.stat-value { font-weight: 700; min-width: 42px; text-align: right; }

.combo-stat { background: rgba(255, 150, 50, 0.22); border-color: rgba(255, 180, 80, 0.5); }
.combo-stat .stat-label { opacity: 1; }
.combo-stat .stat-value { color: #ffe290; }
.level-stat .stat-value { min-width: 90px; }

.actions { display: flex; gap: 8px; }

/* ── Buttons ────────────────────────────────── */
button {
  font: 600 14px system-ui, sans-serif;
  padding: 8px 14px;
  border-radius: 10px;
  border: 2px solid #1a281a;
  background: #e6eadf;
  color: #1a281a;
  cursor: pointer;
  box-shadow: 0 3px 0 #1a281a;
  transition: transform 80ms ease, box-shadow 80ms ease, background 80ms ease;
}
button:hover:not(:disabled) { background: #f4f6ea; }
button:active:not(:disabled) { transform: translateY(2px); box-shadow: 0 1px 0 #1a281a; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

button.primary { background: #f0b63a; color: #2c1a00; border-color: #6e4a00; box-shadow: 0 3px 0 #6e4a00; }
button.primary:hover:not(:disabled) { background: #f8c657; }
button.primary:active:not(:disabled) { box-shadow: 0 1px 0 #6e4a00; }

button.big { font-size: 18px; padding: 12px 24px; }

.hidden { display: none !important; }

/* ── Stage ──────────────────────────────────── */
.stage {
  position: relative;
  width: 100%;
  max-width: 960px;
  aspect-ratio: 960 / 600;
  border-radius: 14px;
  overflow: hidden;
  box-shadow:
    0 8px 0 rgba(0,0,0,0.18),
    0 18px 40px rgba(0,0,0,0.3),
    inset 0 0 0 3px #14200f;
}
#game {
  display: block;
  width: 100%;
  height: 100%;
  background: #6a9a46;
}

/* ── Overlays ──────────────────────────────── */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(18, 30, 16, 0.6);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  overflow: auto;
  padding: 12px;
}
.overlay-card {
  background: #fdf7e2;
  border-radius: 18px;
  padding: 22px 28px;
  text-align: center;
  max-width: 520px;
  box-shadow: 0 8px 0 rgba(0,0,0,0.25), 0 24px 40px rgba(0,0,0,0.35);
  border: 3px solid #3a2a10;
}
.overlay-card.wide { max-width: 720px; width: 100%; }
.overlay-card h1 { margin: 0 0 6px; font-size: 28px; }
.overlay-card h2 { margin: 0 0 8px; font-size: 26px; }
.overlay-card .tagline { margin: 0 0 10px; color: #4a3c18; }
.overlay-card p { color: #4a3c18; margin: 6px 0; }

.overlay-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 12px;
}

.section-label {
  font-weight: 700;
  color: #5a3e10;
  text-align: left;
  margin: 6px 0 6px;
  font-size: 13px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* Level select */
.level-picker { margin: 4px 0 12px; }
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
}
.level-card {
  background: #fff7df;
  border: 2px solid #8c6a24;
  border-radius: 12px;
  padding: 8px 6px;
  cursor: pointer;
  text-align: center;
  box-shadow: 0 3px 0 #6e4a00;
  transition: transform 80ms ease, box-shadow 80ms ease, background 80ms ease;
  font-size: 13px;
}
.level-card .level-tag { font-size: 26px; line-height: 1; }
.level-card .level-name { font-weight: 700; color: #3a2a10; margin-top: 4px; }
.level-card .level-sub  { color: #7a5a18; font-size: 11px; }
.level-card .level-best { color: #1a6a20; font-weight: 700; font-size: 11px; margin-top: 2px; }
.level-card:hover:not(.locked):not(.selected) { background: #fff1c4; }
.level-card.selected {
  background: #ffdb73;
  border-color: #4a2f00;
  box-shadow: 0 3px 0 #4a2f00, 0 0 0 3px rgba(255,210,80,0.55);
}
.level-card.locked {
  opacity: 0.55;
  cursor: not-allowed;
  filter: grayscale(0.6);
}
.level-card.locked::after {
  content: '🔒';
  display: block;
  margin-top: 2px;
}

/* Difficulty row */
.difficulty-picker { margin: 0 0 14px; }
.difficulty-row {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
}
.diff-chip {
  padding: 6px 12px;
  border: 2px solid #8c6a24;
  border-radius: 999px;
  background: #fff7df;
  font-weight: 700;
  color: #3a2a10;
  cursor: pointer;
  font-size: 13px;
  transition: background 80ms ease;
}
.diff-chip:hover { background: #fff1c4; }
.diff-chip.selected {
  background: #ffb84a;
  border-color: #6e4a00;
  color: #2a1800;
}

/* How to play collapsible */
.how-to-details {
  text-align: left;
  margin: 10px auto 14px;
  max-width: 480px;
  border: 1px dashed #b39355;
  border-radius: 10px;
  padding: 6px 12px;
  background: rgba(255, 245, 210, 0.6);
}
.how-to-details summary {
  cursor: pointer;
  font-weight: 700;
  color: #5a3e10;
  padding: 4px 0;
}
.how-to {
  margin: 4px 0 4px;
  padding-left: 20px;
  color: #3a2e10;
  line-height: 1.5;
}
.how-to li { margin: 3px 0; font-size: 13px; }

kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid #8a7240;
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #fff4d0;
  font: 600 12px system-ui, sans-serif;
  color: #3a2a10;
}

/* ── Powers bar ───────────────────────────── */
.powers-bar {
  width: 100%;
  display: flex;
  gap: 10px;
  padding: 8px 14px;
  background: linear-gradient(180deg, #453318, #2c1f0a);
  border-radius: 14px;
  border: 2px solid #1a0f04;
  box-shadow: 0 4px 0 rgba(0,0,0,0.18);
}
.power-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  background: #fff0cf;
  border-radius: 12px;
  border: 2px solid #4a2f00;
  box-shadow: 0 3px 0 #4a2f00;
  text-align: left;
  position: relative;
  overflow: hidden;
  min-height: 48px;
}
.power-btn .power-emoji { font-size: 26px; line-height: 1; }
.power-btn .power-info  { display: flex; flex-direction: column; flex: 1; gap: 2px; }
.power-btn .power-name  { font-weight: 700; color: #3a2a10; }
.power-btn .power-blurb { font-size: 11px; color: #6a4a10; }
.power-btn .power-cd    {
  font-weight: 800;
  color: #6a4a00;
  padding: 4px 10px;
  background: #ffe99a;
  border-radius: 8px;
  font-size: 12px;
  min-width: 58px;
  text-align: center;
}
.power-btn.ready .power-cd { color: #1a6a20; background: #c0f0a8; }
.power-btn.cooling::before {
  content: '';
  position: absolute; inset: 0;
  background: rgba(180, 120, 50, 0.28);
  width: var(--cd, 0%);
  transition: width 100ms linear;
  z-index: 0;
  pointer-events: none;
}
.power-btn > * { position: relative; z-index: 1; }
.power-btn.active {
  background: #ffb84a;
  box-shadow: 0 3px 0 #4a2f00, 0 0 0 3px rgba(255,160,60,0.6);
}
.power-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Tower Tray ─────────────────────────────── */
.tray {
  width: 100%;
  display: flex;
  align-items: stretch;
  gap: 12px;
  padding: 10px 14px;
  background: linear-gradient(180deg, #2d3d24, #1c2818);
  border-radius: 14px;
  border: 2px solid #14200f;
  box-shadow: 0 6px 0 rgba(0,0,0,0.18);
}
.tray-towers {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  flex: 1;
}
.tower-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: #f5eed0;
  border-radius: 10px;
  border: 2px solid #2b1f0a;
  box-shadow: 0 3px 0 #2b1f0a;
  text-align: left;
  min-width: 0;
  overflow: hidden;
}
.tower-btn .tb-emoji { font-size: 22px; line-height: 1; flex-shrink: 0; }
.tower-btn .tb-info { display: flex; flex-direction: column; flex: 1; gap: 1px; min-width: 0; overflow: hidden; }
.tower-btn .tb-name { font-weight: 700; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tower-btn .tb-blurb { font-size: 11px; color: #4a3c18; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tower-btn .tb-cost { font-weight: 700; color: #6e4a00; font-size: 12px; flex-shrink: 0; }
.tower-btn.active {
  background: #fdd566;
  border-color: #6e4a00;
  box-shadow: 0 3px 0 #6e4a00, 0 0 0 3px rgba(255,210,80,0.5);
}
.tower-btn.cant-afford {
  opacity: 0.55;
  filter: grayscale(0.4);
}

.tray-controls { display: flex; gap: 8px; align-items: center; }

@media (max-width: 900px) {
  .tower-btn .tb-blurb { display: none; }
}
@media (max-width: 720px) {
  .brand { display: none; }
  .stat { padding: 4px 8px; font-size: 12px; }
  .tray-towers { grid-template-columns: repeat(3, 1fr); }
  .powers-bar { flex-direction: column; }
}