/* ============================================
   KOVA — Global Design System
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

/* ---------- CSS Variables ---------- */
:root {
  /* Colors — Primary */
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F5F5F5;
  --color-bg-tertiary: #FAFAFA;

  /* Colors — Text */
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #6B6B6B;
  --color-text-muted: #999999;

  /* Colors — Borders */
  --color-border: #E5E5E5;
  --color-border-hover: #CCCCCC;

  /* Colors — Accent */
  --color-accent: #FF6B00;
  --color-accent-hover: #E55F00;

  /* Colors — Status */
  --color-success: #00A67E;
  --color-error: #E53935;
  --color-warning: #F9A825;
  --color-sale: #E53935;

  /* Colors — Badges */
  --color-new-badge: #000000;
  --color-sale-badge: #E53935;
  --color-trending-badge: #FF6B00;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Layout */
  --header-height: 64px;
  --header-height-mobile: 56px;
  --announcement-height: 36px;
  --container-max: 1440px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* Border Radius */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-full: 9999px;
}

/* ---------- Focus Visible (a11y) ---------- */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
}

h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size-md); }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-lg); }
}

@media (min-width: 1024px) {
  .container { padding: 0 40px; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-weight: 500;
  font-size: var(--font-size-base);
  line-height: 1;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

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

.btn-primary:hover {
  background-color: #333333;
}

.btn-primary:disabled {
  background-color: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-black);
  border: 1px solid var(--color-black);
}

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

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

.btn-outline:hover {
  border-color: var(--color-black);
}

.btn-full {
  width: 100%;
}

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  padding: 3px 8px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  line-height: 1.3;
}

.badge-new {
  background-color: var(--color-new-badge);
  color: var(--color-white);
}

.badge-sale {
  background-color: var(--color-sale-badge);
  color: var(--color-white);
}

.badge-trending {
  background-color: var(--color-trending-badge);
  color: var(--color-white);
}

.badge-low-stock {
  background-color: var(--color-warning);
  color: var(--color-black);
}

/* ---------- Form Elements ---------- */
.input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-md);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.input:focus {
  border-color: var(--color-black);
}

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

.input-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

/* ---------- Utilities ---------- */
.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;
}

.text-center { text-align: center; }
.text-uppercase { text-transform: uppercase; }
.text-muted { color: var(--color-text-muted); }
.text-sale { color: var(--color-sale); }
.text-strikethrough { text-decoration: line-through; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.grid { display: grid; }

.relative { position: relative; }

.hidden { display: none; }

/* ---------- Overlay ---------- */
.overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ---------- Section Spacing ---------- */
.section {
  padding: var(--space-3xl) 0;
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-xl);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-hover);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}