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

:root {
  --primary: #ff6b35;
  --secondary: #004e89;
  --accent: #f7c948;
  --dark: #1a1a2e;
  --darker: #0f0f1a;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 107, 53, 0.15);
  --card-hover: rgba(255, 107, 53, 0.08);
  --light: #f0f0f0;
  --green: #4caf50;
  --red: #e74c3c;
  --gold: #ffd700;
  --purple: #9b59b6;
  --cyan: #00bcd4;
  --pink: #e91e63;
  --blue: #1da1f2;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--darker);
  color: var(--light);
  overflow-x: hidden;
  min-height: 100vh;
  user-select: none;
  -webkit-user-select: none;
}

h2, h3 { font-family: 'Bangers', cursive; letter-spacing: 1.5px; }

.hidden { display: none !important; }

/* ===== TOP BAR ===== */
.top-bar {
  position: fixed; top: 0; left: 0; right: 0;
  height: 48px;
  background: rgba(15, 15, 26, 0.95);
  border-bottom: 1px solid var(--card-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1rem; z-index: 100;
  backdrop-filter: blur(10px);
}

.back-link {
  color: var(--primary); text-decoration: none;
  font-weight: 600; font-size: 0.85rem;
  white-space: nowrap;
}
.back-link:hover { text-decoration: underline; }

.top-center { display: flex; gap: 0.8rem; align-items: center; flex-wrap: wrap; }

.gold-display, .lives-display, .wave-display, .kills-display {
  font-size: 0.85rem; font-weight: 700;
  padding: 2px 10px; border-radius: 20px;
  font-family: 'JetBrains Mono', monospace;
}

.gold-display {
  background: rgba(247, 201, 72, 0.15);
  color: var(--accent); border: 1px solid rgba(247, 201, 72, 0.3);
}

.lives-display {
  background: rgba(231, 76, 60, 0.15);
  color: var(--red); border: 1px solid rgba(231, 76, 60, 0.3);
}

.wave-display {
  background: rgba(155, 89, 182, 0.15);
  color: var(--purple); border: 1px solid rgba(155, 89, 182, 0.3);
}

.kills-display {
  background: rgba(255, 107, 53, 0.15);
  color: var(--primary); border: 1px solid rgba(255, 107, 53, 0.3);
}

.top-right { display: flex; align-items: center; gap: 1rem; }

.score-display {
  color: #888; font-size: 0.85rem; white-space: nowrap;
}
.score-display strong {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
}

.speed-controls { display: flex; gap: 0.3rem; }

.speed-btn {
  padding: 4px 10px; background: var(--card);
  border: 1px solid var(--card-border);
  color: #888; font-size: 0.75rem; font-weight: 700;
  border-radius: 6px; cursor: pointer; transition: all 0.15s;
}
.speed-btn.active {
  background: rgba(255, 107, 53, 0.15);
  color: var(--primary); border-color: var(--primary);
}
.speed-btn:hover { color: var(--light); }

/* ===== GAME CONTAINER ===== */
.game-container {
  display: grid;
  grid-template-columns: 240px 1fr 260px;
  min-height: 100vh;
  padding-top: 48px;
  position: relative; z-index: 1;
}

/* ===== TOWER SHOP (LEFT) ===== */
.tower-shop {
  background: rgba(15, 15, 26, 0.92);
  border-right: 1px solid var(--card-border);
  display: flex; flex-direction: column;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
}

.shop-title {
  padding: 0.8rem; font-size: 1.1rem;
  border-bottom: 1px solid var(--card-border);
  color: var(--primary);
}

.tower-list { padding: 0.5rem; }

.tower-shop-item {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 0.5rem 0.6rem;
  margin-bottom: 0.4rem;
  cursor: pointer;
  transition: all 0.15s;
  display: flex; align-items: center; gap: 0.5rem;
}
.tower-shop-item:hover {
  background: var(--card-hover);
  border-color: var(--primary);
  transform: translateX(3px);
}
.tower-shop-item.selected {
  background: rgba(255, 107, 53, 0.12);
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.2);
}
.tower-shop-item.cannot-afford {
  opacity: 0.35; cursor: not-allowed;
}
.tower-shop-item.cannot-afford:hover {
  transform: none; border-color: var(--card-border);
}

.tsi-icon { font-size: 1.5rem; flex-shrink: 0; width: 32px; text-align: center; }
.tsi-info { flex: 1; min-width: 0; }
.tsi-name {
  font-weight: 700; font-size: 0.78rem; color: var(--light);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tsi-desc {
  font-size: 0.65rem; color: #666; margin-top: 1px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tsi-cost {
  font-size: 0.72rem; color: var(--accent); font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

/* ===== GAME AREA (CENTER) ===== */
.game-area {
  display: flex; align-items: center; justify-content: center;
  background: var(--darker);
  position: relative; overflow: hidden;
  min-height: calc(100vh - 48px);
}

.canvas-wrapper {
  position: relative;
  width: 1000px; max-width: 100%;
  aspect-ratio: 1000 / 600;
}

#gameCanvas {
  width: 100%; height: 100%;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  cursor: crosshair;
  image-rendering: auto;
}

/* ===== OVERLAYS ===== */
.overlay {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(10, 10, 20, 0.7);
  z-index: 10; border-radius: 8px;
  backdrop-filter: blur(3px);
}

.overlay-box {
  background: rgba(26, 26, 46, 0.95);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 2rem 2.5rem;
  text-align: center;
  max-width: 420px;
}

.overlay-box h1 {
  font-family: 'Bangers', cursive;
  font-size: 2rem; color: var(--primary);
  letter-spacing: 2px; margin-bottom: 0.8rem;
}
.overlay-box h2 {
  font-size: 1.8rem; color: var(--red);
  margin-bottom: 0.5rem;
}
.overlay-box p {
  color: #aaa; font-size: 0.9rem; line-height: 1.5;
  margin-bottom: 1rem;
}

.big-btn {
  padding: 0.8rem 2.5rem;
  background: linear-gradient(135deg, var(--primary), #ff8f5e);
  border: none; border-radius: 12px;
  color: white; font-family: 'Bangers', cursive;
  font-size: 1.3rem; letter-spacing: 1px;
  cursor: pointer; transition: all 0.2s;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}
.big-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 25px rgba(255, 107, 53, 0.6);
}

.wave-btn {
  padding: 0.7rem 2rem;
  background: linear-gradient(135deg, var(--green), #66bb6a);
  border: none; border-radius: 10px;
  color: white; font-family: 'Bangers', cursive;
  font-size: 1.1rem; letter-spacing: 1px;
  cursor: pointer; transition: all 0.2s;
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
}
.wave-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 25px rgba(76, 175, 80, 0.6);
}

/* Game Over */
.game-over-box { max-width: 450px; }

.go-stats {
  display: flex; gap: 1rem; justify-content: center;
  margin-bottom: 1.2rem;
}
.go-stat {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 10px; padding: 0.6rem 1rem;
  text-align: center;
}
.go-stat span { display: block; font-size: 0.7rem; color: #888; }
.go-stat strong {
  display: block; font-family: 'Bangers', cursive;
  font-size: 1.3rem; color: var(--accent);
}

.go-submit {
  display: flex; gap: 0.5rem; margin-bottom: 0.8rem;
}
.go-input {
  flex: 1; padding: 0.6rem 0.8rem;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 8px; color: var(--light);
  font-size: 0.85rem; outline: none;
}
.go-input:focus { border-color: var(--primary); }

.submit-btn {
  padding: 0.6rem 1.2rem;
  background: var(--primary); border: none;
  border-radius: 8px; color: white;
  font-weight: 700; font-size: 0.85rem;
  cursor: pointer; transition: all 0.15s;
}
.submit-btn:hover { background: #ff8f5e; }

.submit-status {
  font-size: 0.8rem; padding: 0.4rem;
  border-radius: 6px; margin-bottom: 0.8rem;
}
.submit-status.success { background: rgba(76,175,80,0.15); color: var(--green); }
.submit-status.error { background: rgba(231,76,60,0.15); color: var(--red); }

.retry-btn {
  padding: 0.6rem 1.5rem;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 8px; color: var(--light);
  font-weight: 700; cursor: pointer; transition: all 0.15s;
}
.retry-btn:hover {
  background: var(--card-hover); border-color: var(--primary);
}

/* Wave announcement */
.wave-announce {
  position: absolute; top: 15%; left: 50%;
  transform: translateX(-50%);
  font-family: 'Bangers', cursive;
  font-size: 2.5rem; color: var(--primary);
  text-shadow: 0 0 20px rgba(255, 107, 53, 0.6), 0 2px 4px rgba(0,0,0,0.8);
  z-index: 5; pointer-events: none;
  animation: waveAnnounce 2s ease-out forwards;
}
@keyframes waveAnnounce {
  0% { opacity: 0; transform: translateX(-50%) scale(0.5); }
  20% { opacity: 1; transform: translateX(-50%) scale(1.1); }
  40% { transform: translateX(-50%) scale(1); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translateX(-50%) translateY(-30px) scale(0.9); }
}

.boss-warning {
  position: absolute; top: 8%; left: 50%;
  transform: translateX(-50%);
  font-family: 'Bangers', cursive;
  font-size: 1.8rem; color: var(--red);
  text-shadow: 0 0 20px rgba(231, 76, 60, 0.8), 0 2px 4px rgba(0,0,0,0.8);
  z-index: 5; pointer-events: none;
  animation: bossWarn 1.5s ease-in-out infinite;
}
@keyframes bossWarn {
  0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
  50% { opacity: 0.6; transform: translateX(-50%) scale(1.05); }
}

/* ===== INFO PANEL (RIGHT) ===== */
.info-panel {
  background: rgba(15, 15, 26, 0.92);
  border-left: 1px solid var(--card-border);
  display: flex; flex-direction: column;
  max-height: calc(100vh - 48px);
}

.info-tabs {
  display: flex; border-bottom: 1px solid var(--card-border);
  flex-shrink: 0;
}
.info-tab {
  flex: 1; padding: 0.6rem 0.3rem;
  background: none; border: none; color: #888;
  font-size: 0.75rem; font-weight: 700; cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.info-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: rgba(255, 107, 53, 0.05);
}
.info-tab:hover { color: var(--light); }

.info-tab-content {
  display: none; overflow-y: auto; flex: 1;
  padding: 0.8rem;
}
.info-tab-content.active { display: block; }

.panel-title {
  font-size: 1rem; color: var(--primary);
  margin-bottom: 0.8rem;
}

.info-placeholder {
  text-align: center; color: #555;
  padding: 2rem 1rem;
  font-size: 0.85rem; line-height: 1.6;
}
.info-placeholder p:first-child { font-size: 2rem; margin-bottom: 0.5rem; }

/* Tower info panel */
.tower-detail { display: block; }
.tower-detail-header {
  display: flex; align-items: center; gap: 0.6rem;
  margin-bottom: 0.8rem;
}
.tower-detail-icon { font-size: 2rem; }
.tower-detail-name {
  font-family: 'Bangers', cursive; font-size: 1.2rem;
  color: var(--light);
}
.tower-detail-level {
  font-size: 0.7rem; color: var(--accent);
  background: rgba(247,201,72,0.15);
  padding: 2px 8px; border-radius: 10px;
}

.tower-stats {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 8px; padding: 0.6rem;
  margin-bottom: 0.8rem;
}
.tower-stat-row {
  display: flex; justify-content: space-between;
  padding: 0.25rem 0; font-size: 0.78rem;
}
.tower-stat-row span:first-child { color: #888; }
.tower-stat-row strong {
  color: var(--light);
  font-family: 'JetBrains Mono', monospace;
}

.tower-desc {
  font-size: 0.78rem; color: #888;
  line-height: 1.4; margin-bottom: 0.8rem;
  font-style: italic;
}

.tower-actions {
  display: flex; flex-direction: column; gap: 0.4rem;
}

.upgrade-btn, .sell-btn {
  padding: 0.5rem 0.8rem; border: none;
  border-radius: 8px; font-weight: 700;
  font-size: 0.8rem; cursor: pointer;
  transition: all 0.15s;
}
.upgrade-btn {
  background: linear-gradient(135deg, var(--green), #66bb6a);
  color: white;
}
.upgrade-btn:hover { filter: brightness(1.15); }
.upgrade-btn:disabled {
  opacity: 0.4; cursor: not-allowed;
  filter: grayscale(0.5);
}
.sell-btn {
  background: rgba(231, 76, 60, 0.15);
  color: var(--red); border: 1px solid rgba(231,76,60,0.3);
}
.sell-btn:hover { background: rgba(231, 76, 60, 0.25); }

.targeting-select {
  display: flex; gap: 0.3rem; margin-bottom: 0.6rem;
}
.target-btn {
  flex: 1; padding: 0.35rem 0.3rem;
  background: var(--card); border: 1px solid var(--card-border);
  color: #888; font-size: 0.65rem; font-weight: 700;
  border-radius: 6px; cursor: pointer; transition: all 0.15s;
}
.target-btn.active {
  background: rgba(255, 107, 53, 0.15);
  color: var(--primary); border-color: var(--primary);
}

/* Wave info */
.wave-info-list { display: block; }
.wave-info-item {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 8px; padding: 0.5rem 0.6rem;
  margin-bottom: 0.4rem;
}
.wave-info-item.current {
  border-color: var(--primary);
  background: rgba(255, 107, 53, 0.08);
}
.wave-info-item.completed {
  opacity: 0.4;
}
.wave-info-header {
  font-weight: 700; font-size: 0.8rem;
  color: var(--light); margin-bottom: 0.3rem;
}
.wave-info-header .boss-tag {
  color: var(--red); font-size: 0.7rem;
  margin-left: 0.3rem;
}
.wave-info-enemies {
  font-size: 0.7rem; color: #888;
}

/* Leaderboard */
.leaderboard-list { margin-bottom: 0.5rem; }
.leaderboard-loading { color: #555; font-size: 0.85rem; text-align: center; padding: 1rem; }

.lb-entry {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 0.78rem;
}
.lb-rank {
  width: 24px; text-align: center; font-weight: 900;
  color: var(--accent); font-family: 'Bangers', cursive;
  font-size: 0.95rem;
}
.lb-rank.gold { color: #ffd700; }
.lb-rank.silver { color: #c0c0c0; }
.lb-rank.bronze { color: #cd7f32; }

.lb-name { flex: 1; font-weight: 700; color: var(--light); overflow: hidden; text-overflow: ellipsis; }
.lb-score {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent); font-weight: 700; font-size: 0.75rem;
}
.lb-wave {
  font-size: 0.7rem; color: var(--purple);
  margin-left: 0.3rem;
}

.refresh-btn {
  width: 100%; padding: 0.5rem;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 8px; color: #888;
  font-weight: 700; font-size: 0.8rem;
  cursor: pointer; transition: all 0.15s;
}
.refresh-btn:hover {
  background: var(--card-hover); color: var(--light);
}

/* ===== MOBILE NAV ===== */
.mobile-nav {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0;
  background: rgba(15, 15, 26, 0.98);
  border-top: 1px solid var(--card-border);
  z-index: 100; padding: 0.3rem;
  justify-content: center; gap: 0.5rem;
}
.mobile-nav-btn {
  flex: 1; max-width: 100px;
  padding: 0.5rem; background: none; border: none;
  color: #888; font-size: 1.2rem; cursor: pointer;
  border-radius: 8px; transition: all 0.15s;
}
.mobile-nav-btn.active {
  background: rgba(255, 107, 53, 0.1);
  color: var(--primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1200px) {
  .game-container {
    grid-template-columns: 200px 1fr 220px;
  }
}

@media (max-width: 900px) {
  .game-container {
    grid-template-columns: 1fr;
  }
  .tower-shop, .info-panel {
    display: none;
    position: fixed; top: 48px; bottom: 44px;
    width: 100%; z-index: 50;
    max-height: none;
    background: rgba(15, 15, 26, 0.98);
  }
  .tower-shop { left: 0; }
  .info-panel { right: 0; border-left: none; }

  .tower-shop.mobile-show,
  .info-panel.mobile-show {
    display: flex;
  }

  .mobile-nav { display: flex; }

  .game-area {
    min-height: auto;
    padding-bottom: 44px;
  }

  .top-center { gap: 0.4rem; }
  .gold-display, .lives-display, .wave-display, .kills-display {
    font-size: 0.72rem; padding: 2px 6px;
  }
  .score-display { font-size: 0.75rem; }
  .speed-btn { padding: 3px 7px; font-size: 0.7rem; }
}

@media (max-width: 500px) {
  .top-bar { padding: 0 0.5rem; height: 42px; }
  .back-link { font-size: 0.75rem; }
  .kills-display { display: none; }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 107, 53, 0.2);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 107, 53, 0.4); }