/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #1c2333;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --gold: #f0c040;
  --red: #f85149;
  --green: #3fb950;
  --blue: #58a6ff;
  --purple: #bc8cff;
  --orange: #d29922;
  --cyan: #39d2c0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* === OVERLAY (difficulty / game over) === */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  overflow-y: auto;
  padding: 20px;
}
.overlay-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  max-width: 600px;
  width: 100%;
  text-align: center;
  max-height: 90vh;
  overflow-y: auto;
}
.overlay-box h1 { font-size: 2.2rem; margin-bottom: 10px; }
.overlay-box .subtitle { color: var(--blue); font-size: 1.1rem; margin-bottom: 6px; }
.overlay-box .desc { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 24px; line-height: 1.5; }

/* Difficulty buttons */
.diff-choices { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 30px; }
.diff-btn {
  padding: 12px 24px;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--surface2);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 600;
}
.diff-btn:hover { transform: translateY(-2px); border-color: var(--blue); }
.diff-easy:hover { border-color: var(--green); }
.diff-normal:hover { border-color: var(--gold); }
.diff-hard:hover { border-color: var(--red); }
.diff-insane:hover { border-color: var(--purple); }

/* Game over inputs */
#go-nickname {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  width: 200px;
  margin-right: 8px;
}
#go-submit-btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: var(--green);
  color: #000;
  font-weight: 700;
  cursor: pointer;
  font-size: 1rem;
}
#go-submit-btn:hover { opacity: 0.85; }
#go-message { color: var(--gold); margin-top: 8px; min-height: 20px; }

/* === LEADERBOARD === */
#leaderboard-section, #go-leaderboard { margin-top: 30px; }
#leaderboard-section h2, #go-leaderboard h2 { margin-bottom: 12px; font-size: 1.3rem; }

.lb-filters { display: flex; gap: 6px; justify-content: center; margin-bottom: 12px; flex-wrap: wrap; }
.lb-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface2);
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}
.lb-btn:hover, .lb-btn.active { border-color: var(--blue); color: var(--text); background: var(--bg); }

.lb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.lb-table th {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 2px solid var(--border);
  color: var(--text-dim);
  font-size: 0.8rem;
  text-transform: uppercase;
}
.lb-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
}
.lb-table .top-1 td { color: var(--gold); font-weight: 700; }
.lb-table .top-2 td { color: #c0c0c0; font-weight: 600; }
.lb-table .top-3 td { color: #cd7f32; font-weight: 600; }

.diff-badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}
.diff-easy { background: #1a3a1a; color: var(--green); }
.diff-normal { background: #3a3a1a; color: var(--gold); }
.diff-hard { background: #3a1a1a; color: var(--red); }
.diff-insane { background: #2a1a3a; color: var(--purple); }

.lb-empty { color: var(--text-dim); font-style: italic; padding: 20px; }

/* === GAME LAYOUT === */
#game-wrapper {
  display: flex;
  height: 100vh;
  gap: 0;
}
#game-area {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  background: #0a0e14;
  overflow: auto;
  min-width: 0;
  padding: 10px;
}
#gameCanvas {
  display: block;
  image-rendering: pixelated;
}

/* === SIDE PANEL === */
#side-panel {
  width: 260px;
  min-width: 260px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
#side-panel h2 { font-size: 1.2rem; text-align: center; }
#side-panel h3 { font-size: 0.95rem; color: var(--text-dim); margin-bottom: 4px; }
#side-panel hr { border: none; border-top: 1px solid var(--border); }

.info-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  padding: 2px 0;
}
.info-label { color: var(--text-dim); }

/* Tower buttons */
#tower-buttons { display: flex; flex-direction: column; gap: 6px; }
.tower-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
  font-size: 0.85rem;
}
.tower-btn:hover { border-color: var(--blue); }
.tower-btn.selected { border-color: var(--gold); background: #2a2518; }
.tower-btn.disabled { opacity: 0.4; cursor: not-allowed; }
.tower-btn .t-icon {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.tower-btn .t-info { flex: 1; text-align: left; }
.tower-btn .t-name { font-weight: 600; display: block; }
.tower-btn .t-cost { color: var(--gold); font-size: 0.8rem; }

/* Tower info panel */
#tower-info-panel { font-size: 0.85rem; }
#tower-info-details { margin-bottom: 8px; line-height: 1.6; }
#upgrade-btn, #sell-btn {
  width: 100%;
  padding: 8px;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 4px;
  font-size: 0.85rem;
}
#upgrade-btn { background: var(--blue); color: #000; }
#upgrade-btn:hover { opacity: 0.85; }
#sell-btn { background: var(--red); color: #fff; }
#sell-btn:hover { opacity: 0.85; }

#wave-btn {
  margin-top: auto;
  padding: 14px;
  border: 2px solid var(--green);
  border-radius: 10px;
  background: transparent;
  color: var(--green);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}
#wave-btn:hover { background: var(--green); color: #000; }

#controls-help ul {
  list-style: none;
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.7;
}
#controls-help ul b { color: var(--text); }

/* Mobile floating button */
#mobile-panel-btn{
  display:none;
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 1200;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  border: 2px solid var(--green);
  background: rgba(12, 20, 14, 0.92);
  color: var(--green);
  font-size: 20px;
  font-weight: 900;
  cursor: grab;
  user-select: none;
  touch-action: none;
  box-shadow: 0 10px 24px rgba(0,0,0,0.45);
}
#mobile-panel-btn:active{cursor: grabbing;}

#mobile-topbar{
  display:none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1150;
  padding: 10px 10px;
  background: rgba(10, 14, 20, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}
#mobile-topbar .mt-left, #mobile-topbar .mt-right{display:flex;gap:8px;align-items:center}
#mobile-topbar .mt-left{justify-content:flex-start}
#mobile-topbar .mt-right{justify-content:flex-end}
#mobile-topbar{justify-content:space-between;align-items:center;gap:10px}
.mt-pill{display:inline-flex;gap:6px;align-items:center;padding:6px 10px;border:1px solid var(--border);border-radius:999px;background: rgba(22,27,34,0.85);font-weight:800;font-size:0.92rem}

/* Mobile compact bottom bar (for tile actions/build) */
#mobile-bottombar{
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1170;
  background: rgba(10, 14, 20, 0.94);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(6px);
  padding: 10px;
}
#mbb-inner{display:flex; flex-direction:column; gap:8px}
#mbb-row1{display:flex; align-items:center; justify-content:space-between; gap:10px}
#mbb-title{font-weight:900; font-size:0.98rem; line-height:1.05; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
#mbb-row2{
  color: var(--text-dim);
  font-size:0.82rem;
  line-height:1.15;
  white-space:normal;
  overflow:hidden;
  display:-webkit-box;
  -webkit-box-orient:vertical;
  -webkit-line-clamp:2; /* max 2 lines */
}
#mbb-row3{display:block}

#mbb-actions{display:flex; gap:8px; align-items:center; flex-wrap:nowrap; overflow-x:auto; padding-bottom:2px}
#mbb-actions .tower-btn{flex:0 0 auto; padding:8px 10px; touch-action: manipulation}
#mbb-actions .diff-btn{flex:0 0 auto; padding:8px 10px; touch-action: manipulation}

@media (max-width: 420px){
  #mbb-title{font-size:0.95rem}
  #mbb-row2{font-size:0.78rem}
}

@media (max-width: 900px){
  /* keep bottom bar from covering content: leave breathing room */
  #game-area{ padding-bottom: 90px; }
}

/* === RESPONSIVE === */
@media (max-width: 900px) {
  #mobile-panel-btn{display:block;}
  #mobile-topbar{display:flex;}

  #game-wrapper { flex-direction: column; height: auto; }

  /* Hide the desktop side panel; mobile uses tap-to-open tile menu */
  #side-panel { display:none; }

  /* Leave space for the fixed top bar */
  #game-area { height: calc(100vh - 64px); padding-top: 64px; overflow:auto; align-items:flex-start; }
}