@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap');

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

:root {
  /* Color Palette - Train themed */
  --primary: #2c3e50;
  --primary-dark: #1a252f;
  --accent: #e74c3c;
  --accent-hover: #c0392b;
  --secondary: #3498db;
  --background: #ecf0f1;
  --card-bg: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --border: #bdc3c7;
  --success: #27ae60;
  --warning: #f39c12;
  --danger: #c0392b;
  --danger-hover: #992d22;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
}

html {
  font-size: 62.5%;
}

body {
  font-family: Inter, Arial, sans-serif;
  font-size: 1.6rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background);
  min-height: 100vh;
}

/* Buttons */
.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.4rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.175s ease;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-secondary:hover {
  background: #2980b9;
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
}

.danger-zone {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 2px dotted var(--danger);
  border-radius: var(--radius-sm);
  color: var(--danger);
  background: #fdecea;

  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.danger-zone p {
  font-weight: 500;
  font-size: 1.4rem;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-danger:hover {
  background: var(--danger-hover);
  box-shadow: var(--shadow-md);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.empty-state-icon {
  font-size: 8rem;
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

.empty-state-message {
  font-size: 1.6rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .page-title {
    font-size: 3rem;
  }

  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-bar select,
  .filter-bar input {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .filter-bar {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  .filter-bar div {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }

  .filter-bar select,
  .filter-bar input {
    min-width: 0;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }
}