:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  color: #fff;
}

.btn-primary { background: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #dc2626; }
.btn-success { background: var(--success); }
.btn-success:hover { background: #16a34a; }
.btn-warning { background: var(--warning); }
.btn-warning:hover { background: #d97706; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 4px 12px; font-size: 12px; }
.btn-lg { padding: 14px 32px; font-size: 18px; }

input, select {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}

input:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-overlay.active { display: flex; }

.modal {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
}

.modal h3 { margin-bottom: 20px; }

.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  z-index: 2000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.toast.show { opacity: 1; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }