/* ==========================================================================
   NekoAdvance - Main Stylesheet & Global Design System
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-primary: #51407e;
  --bg-darker: #2f2549;
  --bg-surface: #241d38;
  --bg-card: rgba(47, 37, 73, 0.85);
  --bg-card-hover: rgba(65, 52, 100, 0.9);
  
  --accent-purple: #8b5cf6;
  --accent-light: #a78bfa;
  --accent-glow: rgba(167, 139, 250, 0.4);
  --accent-cyan: #38bdf8;
  --accent-pink: #ec4899;
  --accent-green: #34d399;
  --accent-gold: #fbbf24;
  --accent-danger: #f87171;

  --cat-body: #1c1a20;
  --cat-body-border: #353040;
  --cat-accent: #51407e;
  
  --btn-dark: #2a2536;
  --btn-border: #4d4461;
  --btn-active: #1a1622;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-retro: 'Press Start 2P', cursive, monospace;

  /* Transitions & Shadows */
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--accent-glow);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background-color: #51407e;
  background: #51407e;
  color: var(--text-main);
  font-family: var(--font-sans);
  touch-action: none;
}

/* App Root Container */
#app {
  width: 100vw;
  height: 100%;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

/* Drag and drop overlay */
.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(30, 24, 48, 0.92);
  backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease-smooth);
  border: 4px dashed var(--accent-light);
  border-radius: 24px;
  margin: 20px;
}

.drop-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.drop-overlay .icon {
  width: 80px;
  height: 80px;
  color: var(--accent-light);
  animation: bounce 1.5s infinite;
}

.drop-overlay h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
}

.drop-overlay p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb {
  background: var(--accent-purple);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-light);
}