/* ==========================================================================
   NORTHSTAR COMMERCE - BASE STYLES & RESET
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

::selection {
  background-color: #121316;
  color: #ffffff;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Screen reader utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
}

.font-serif {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.01em;
}

.font-mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-md); }

p {
  color: var(--color-text-secondary);
}

.text-lead {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-text-secondary);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-2xs { font-size: var(--text-2xs); }
.text-semibold { font-weight: 600; }
.text-bold { font-weight: 700; }

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--text-xs);
  font-weight: 600;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

.container-narrow {
  width: 100%;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

/* Button Component System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.85rem 1.75rem;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  border-radius: var(--radius-xs);
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
  position: relative;
  text-align: center;
  min-height: 44px; /* Accessible touch target */
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-dark);
}

.btn-secondary:hover {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text-primary);
  background-color: var(--color-surface);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid transparent;
  padding: 0.5rem 0.75rem;
}

.btn-ghost:hover {
  background-color: rgba(18, 19, 22, 0.05);
}

.btn-link {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-text-primary);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 4px;
  min-height: auto;
}

.btn-link:hover {
  opacity: 0.7;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-xs);
  min-height: 36px;
}

.btn-xs {
  padding: 0.25rem 0.5rem;
  font-size: var(--text-2xs);
  min-height: 28px;
}

.btn-lg {
  padding: 1.1rem 2.25rem;
  font-size: var(--text-base);
  min-height: 52px;
}

.btn-full {
  width: 100%;
}

.btn:disabled, .btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-icon {
  width: 42px;
  height: 42px;
  min-width: 42px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  border-color: var(--color-text-primary);
  background-color: var(--color-surface-hover);
}

/* Form Controls */
.form-group {
  margin-bottom: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  font-size: var(--text-sm);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.form-input::placeholder, .form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input.error, .form-select.error, .form-textarea.error {
  border-color: var(--color-danger);
}

.form-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  cursor: pointer;
  user-select: none;
}

.form-checkbox {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  background-color: var(--color-surface);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.form-checkbox:checked {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.form-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  font-size: var(--text-2xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  white-space: nowrap;
}

.badge-dark {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.badge-sale {
  background-color: var(--color-accent-burgundy);
  color: var(--color-text-inverse);
}

.badge-gold {
  background-color: var(--color-accent-gold-light);
  color: var(--color-accent-gold);
  border: 1px solid rgba(179, 139, 77, 0.3);
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-muted {
  background-color: var(--color-bg-alt);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.badge-soldout {
  background-color: #e5e5e5;
  color: #737373;
}

/* Dividers & Borders */
.divider {
  height: 1px;
  background-color: var(--color-border);
  width: 100%;
  margin: var(--space-6) 0;
}

.divider-subtle {
  height: 1px;
  background-color: var(--color-border-subtle);
  width: 100%;
  margin: var(--space-4) 0;
}

/* Grid Utilities */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* List View for Catalog */
.grid-list-view {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.grid-list-view .product-card {
  flex-direction: row;
  height: auto;
  align-items: center;
}

.grid-list-view .product-card-image-wrap {
  width: 180px;
  min-width: 180px;
  padding-top: 0;
  height: 220px;
}

.grid-list-view .product-card-body {
  padding: var(--space-6);
  flex: 1;
}

@media (max-width: 640px) {
  .grid-list-view .product-card {
    flex-direction: column;
  }
  .grid-list-view .product-card-image-wrap {
    width: 100%;
    min-width: 100%;
    height: 280px;
  }
}

@media (max-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
}

/* Flex Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Animation Utility */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.3s var(--ease-out-expo) forwards;
}

/* Reduced Motion Override for Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}