:root {
  /* Colors */
  --bg-dark: #0f172a; /* Slate 900 */
  --bg-dark-accent: #1e293b; /* Slate 800 */
  
  --primary: #3b82f6; /* Blue 500 */
  --primary-hover: #2563eb; /* Blue 600 */
  --primary-glow: rgba(59, 130, 246, 0.5);
  
  --accent: #8b5cf6; /* Violet 500 */
  --accent-glow: rgba(139, 92, 246, 0.4);

  --success: #10b981; /* Emerald 500 */
  --danger: #ef4444; /* Red 500 */
  --warning: #f59e0b; /* Amber 500 */

  --text-main: #f8fafc; /* Slate 50 */
  --text-muted: #94a3b8; /* Slate 400 */

  /* Glassmorphism */
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: 
    radial-gradient(circle at 15% 50%, var(--primary-glow), transparent 25%),
    radial-gradient(circle at 85% 30%, var(--accent-glow), transparent 25%);
  background-attachment: fixed;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

/* Utilities */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: 16px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-danger {
  background: var(--danger);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  transition: opacity 0.2s;
}
.btn-danger:hover {
  opacity: 0.8;
}

.input-glass {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-glass:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
  outline: none;
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-secondary:hover:not(:disabled) {
  background: rgba(255,255,255,0.1);
}
.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.icon-btn {
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
  padding: 8px;
  border-radius: 8px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover {
  background: var(--primary);
  color: white;
}
.icon-btn.danger:hover {
  background: var(--danger);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}