:root {
  /* Ultra-modern dark cosmic palette */
  --bg-primary: #030308;
  --bg-secondary: #0a0b14;
  --bg-panel: rgba(13, 14, 26, 0.7);
  --bg-card: rgba(20, 22, 40, 0.4);
  --bg-card-hover: rgba(35, 40, 70, 0.6);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 229, 255, 0.4);
  
  /* Text */
  --text-primary: #f0f2f5;
  --text-secondary: #a0a5b5;
  --text-muted: #606575;

  /* Accents */
  --essence-cyan: #00e5ff;
  --essence-glow: rgba(0, 229, 255, 0.5);
  --golden-amber: #ffb300;
  --golden-glow: rgba(255, 179, 0, 0.4);
  --prestige-violet: #d500f9;
  --prestige-glow: rgba(213, 0, 249, 0.4);
  --danger-red: #ff1744;
  --success-green: #00e676;

  /* Generator tier tints (neon brights) */
  --tier-1: #00e5ff;
  --tier-2: #2979ff;
  --tier-3: #651fff;
  --tier-4: #d500f9;
  --tier-5: #f50057;
  --tier-6: #ff1744;
  --tier-7: #ff9100;
  --tier-8: #ffea00;
  --tier-9: #76ff03;
  --tier-10: #00e676;
  --tier-11: #1de9b6;
  --tier-12: #ffffff;

  /* Typography */
  --font-display: 'Exo 2', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-body: 'Exo 2', system-ui, sans-serif;

  /* Dimensions & Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap-md: 16px;
  --gap-lg: 24px;
  --gap-xl: 32px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--essence-cyan); }

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  z-index: 1;
}

#game-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: var(--gap-lg);
  padding: var(--gap-lg);
  flex: 1;
  overflow: hidden;
  max-width: 1800px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 1199px) {
  #game-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    overflow-y: auto;
    padding: var(--gap-md);
  }
}

#orb-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  padding: var(--gap-xl);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
  position: relative;
  overflow: hidden;
}

#orb-panel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--essence-cyan), transparent);
  opacity: 0.5;
}

@media (max-width: 1199px) {
  #orb-panel {
    flex-direction: row;
    padding: var(--gap-md);
    justify-content: space-around;
  }
}

#content-panel {
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
  overflow: hidden;
}

#tab-bar {
  display: flex;
  background: rgba(0, 0, 0, 0.4);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--gap-sm) var(--gap-md);
  overflow-x: auto;
  gap: var(--gap-sm);
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: var(--gap-sm) var(--gap-lg);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.tab-btn.active {
  color: #000;
  background: var(--essence-cyan);
  box-shadow: 0 0 15px var(--essence-glow);
}

#dark-arts-tab-btn.active {
  background: var(--prestige-violet);
  box-shadow: 0 0 15px var(--prestige-glow);
  color: #fff;
}

#tab-content {
  flex: 1;
  padding: var(--gap-lg);
  overflow-y: auto;
  position: relative;
}

.tab-page {
  display: none;
  animation: fadeIn var(--transition-normal);
}
.tab-page.active { display: block; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

#game-footer {
  padding: var(--gap-md) var(--gap-lg);
  background: rgba(0,0,0,0.6);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  backdrop-filter: blur(10px);
}

.hidden { display: none !important; }
button { cursor: pointer; font-family: var(--font-body); }
button:disabled { cursor: not-allowed; opacity: 0.5; filter: grayscale(1); }

.btn-primary {
  background: linear-gradient(135deg, var(--essence-cyan), #00b0ff);
  color: #000;
  border: none;
  padding: var(--gap-md) var(--gap-xl);
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 229, 255, 0.3);
  transition: var(--transition-fast);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.5);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  padding: var(--gap-md) var(--gap-xl);
  border-radius: var(--radius-md);
  font-weight: 700;
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}
.btn-secondary:hover:not(:disabled) {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
}

/* Ripples */
.tab-btn::after, .btn-primary::after, .buy-btn::after, .btn-secondary::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 5px; height: 5px;
  background: rgba(255, 255, 255, 0.6);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%, -50%);
  transform-origin: 50% 50%;
}
.tab-btn:active::after, .btn-primary:active::after, .buy-btn:active::after, .btn-secondary:active::after {
  animation: ripple 0.4s ease-out;
}
@keyframes ripple {
  0% { transform: scale(0, 0); opacity: 0.5; }
  100% { transform: scale(40, 40); opacity: 0; }
}

/* Modals */
#modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 8, 0.85);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; backdrop-filter: blur(10px);
}
#modal-box {
  background: var(--bg-panel);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--gap-xl);
  max-width: 500px; width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255,255,255,0.1);
  animation: modalIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
#modal-title { margin-bottom: var(--gap-md); color: var(--essence-cyan); font-family: var(--font-display); font-size: 1.8rem; text-shadow: 0 0 15px var(--essence-glow); font-weight: 900; }
#modal-body { margin-bottom: var(--gap-xl); line-height: 1.6; color: var(--text-primary); font-size: 1.05rem; }
#modal-actions { display: flex; justify-content: flex-end; gap: var(--gap-md); }