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

:root {
  --bg: #0a0a0a;
  --bg-card: #151515;
  --bg-input: #1a1a1a;
  --text: #e8e8e8;
  --text-muted: #777;
  --accent: #00ffff;
  --accent-hover: #66ffff;
  --green: #2ecc71;
  --red: #e74c3c;
  --blue: #3498db;
  --yellow: #f1c40f;
  --purple: #9b59b6;
  --orange: #e67e22;
  --alt-0: #e74c3c;
  --alt-1: #3498db;
  --alt-2: #f1c40f;
  --alt-3: #2ecc71;
  --alt-4: #9b59b6;
  --alt-5: #e67e22;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --transition: 0.2s ease;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
}

button:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: #000;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid #333;
}
.btn-secondary:hover { background: #252525; }

.btn-danger {
  background: var(--red);
  color: white;
}
.btn-danger:hover { background: #c0392b; }

.btn-success {
  background: var(--green);
  color: white;
}
.btn-success:hover { background: #27ae60; }

input, select, textarea {
  font-family: var(--font);
  background: var(--bg-input);
  border: 1px solid #333;
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  width: 100%;
  transition: border-color var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.hidden { display: none !important; }

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes confetti-fall {
  0% { transform: translateY(-100vh) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

.fade-in { animation: fadeIn 0.3s ease forwards; }
.slide-up { animation: slideUp 0.5s ease forwards; }