/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #10b981;
  --color-accent-dark: #059669;
  --color-danger: #dc2626;
  --color-danger-light: #fee2e2;
  --color-warning: #d97706;
  --color-warning-light: #fef3c7;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;

  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-border-focus: #2563eb;

  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-text-inverse: #ffffff;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --header-height: 64px;
  --container-max: 1200px;
  --transition: 150ms ease;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  min-height: 100vh;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: underline; }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, select, textarea { font: inherit; }
h1, h2, h3, h4, h5, h6 { line-height: 1.2; font-weight: 600; }

/* ===== ACCESSIBILITY ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-md);
  z-index: 9999;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: var(--spacing-md); }
:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }
:focus:not(:focus-visible) { outline: none; }

/* ===== LAYOUT ===== */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--spacing-md); }
@media (min-width: 640px) { .container { padding: 0 var(--spacing-lg); } }
@media (min-width: 1024px) { .container { padding: 0 var(--spacing-xl); } }
.page-wrapper { display: flex; flex-direction: column; min-height: 100vh; }
.page-main { flex: 1; padding: var(--spacing-xl) 0; }

/* ===== GRID ===== */
.grid { display: grid; gap: var(--spacing-md); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 640px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ===== TYPOGRAPHY UTILITIES ===== */
.text-muted { color: var(--color-text-secondary); }
.text-center { text-align: center; }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-sm);
  padding: 10px 20px; border-radius: var(--radius); font-size: 0.9375rem; font-weight: 500;
  text-decoration: none; cursor: pointer; transition: all var(--transition);
  border: 2px solid transparent; white-space: nowrap; min-height: 44px;
}
.btn--primary { background: var(--color-primary); color: var(--color-text-inverse); border-color: var(--color-primary); }
.btn--primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); color: var(--color-text-inverse); }
.btn--secondary { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--secondary:hover { background: var(--color-primary-light); color: var(--color-primary); }
.btn--ghost { background: transparent; color: var(--color-text-secondary); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-border); color: var(--color-text); }
.btn--sm { padding: 6px 14px; font-size: 0.875rem; min-height: 36px; }
.btn--lg { padding: 14px 28px; font-size: 1.0625rem; min-height: 52px; }

/* ===== HEADER ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-surface); border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm); min-height: var(--header-height);
}
.header__inner {
  display: flex; align-items: center; gap: var(--spacing-md);
  padding: 0 var(--spacing-md); height: var(--header-height);
  max-width: var(--container-max); margin: 0 auto;
}
.header__logo { display: flex; align-items: center; gap: var(--spacing-sm); text-decoration: none; flex-shrink: 0; }
.header__logo img { height: 40px; width: auto; object-fit: contain; }
.header__logo-text { font-size: 1.25rem; font-weight: 700; color: var(--color-text); white-space: nowrap; }
.header__nav { display: none; }
@media (min-width: 768px) { .header__nav { display: flex; align-items: center; gap: var(--spacing-lg); } }
.header__nav-link {
  font-size: 0.9375rem; font-weight: 500; color: var(--color-text-secondary);
  text-decoration: none; padding: 6px 4px; border-bottom: 2px solid transparent;
  transition: all var(--transition);
}
.header__nav-link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.header__nav-link.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.header__actions { display: flex; align-items: center; gap: var(--spacing-sm); margin-left: auto; }
.header__cart-btn {
  position: relative; background: none; border: none; cursor: pointer;
  padding: 8px; border-radius: var(--radius); color: var(--color-text-secondary);
  font-size: 1.25rem; display: flex; align-items: center; min-height: 44px; min-width: 44px;
  justify-content: center; transition: all var(--transition); text-decoration: none;
}
.header__cart-btn:hover { color: var(--color-primary); background: var(--color-primary-light); }
.header__menu-btn {
  display: flex; align-items: center; justify-content: center;
  padding: 8px; border-radius: var(--radius); min-height: 44px; min-width: 44px;
  color: var(--color-text-secondary); font-size: 1.25rem; transition: all var(--transition);
}
.header__menu-btn:hover { background: var(--color-border); }
@media (min-width: 768px) { .header__menu-btn { display: none; } }

/* ===== MOBILE MENU ===== */
.mobile-menu {
  display: none; flex-direction: column; gap: 0;
  background: var(--color-surface); border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
}
.mobile-menu.open { display: flex; }
.mobile-menu__link {
  padding: var(--spacing-sm) var(--spacing-md); font-size: 1rem; font-weight: 500;
  color: var(--color-text); text-decoration: none; display: block;
  transition: background var(--transition);
}
.mobile-menu__link:hover { background: var(--color-bg); }
.mobile-menu__divider { height: 1px; background: var(--color-border); margin: var(--spacing-sm) 0; }

/* ===== FOOTER ===== */
.footer { background: var(--color-text); color: #d1d5db; padding: var(--spacing-2xl) 0 var(--spacing-lg); margin-top: auto; }
.footer__grid { display: grid; gap: var(--spacing-2xl); grid-template-columns: 1fr; }
@media (min-width: 640px) { .footer__grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer__brand { display: flex; flex-direction: column; gap: var(--spacing-md); }
.footer__logo { font-size: 1.25rem; font-weight: 700; color: white; text-decoration: none; }
.footer__tagline { color: #9ca3af; font-size: 0.9rem; }
.footer__heading { font-size: 0.875rem; font-weight: 600; color: white; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--spacing-md); }
.footer__link { display: block; color: #9ca3af; text-decoration: none; font-size: 0.9rem; padding: 4px 0; transition: color var(--transition); }
.footer__link:hover { color: white; }
.footer__bottom {
  border-top: 1px solid #374151; margin-top: var(--spacing-2xl); padding-top: var(--spacing-lg);
  display: flex; flex-wrap: wrap; gap: var(--spacing-md); justify-content: space-between; align-items: center;
}
.footer__copy { font-size: 0.875rem; color: #6b7280; }

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white; padding: var(--spacing-3xl) 0; text-align: center;
}
.hero__title { font-size: 2rem; font-weight: 800; margin-bottom: var(--spacing-md); line-height: 1.2; }
@media (min-width: 640px) { .hero__title { font-size: 2.75rem; } }
@media (min-width: 1024px) { .hero__title { font-size: 3.5rem; } }
.hero__subtitle { font-size: 1.125rem; opacity: 0.9; margin-bottom: var(--spacing-xl); max-width: 600px; margin-left: auto; margin-right: auto; }
.hero__actions { display: flex; gap: var(--spacing-md); justify-content: center; flex-wrap: wrap; }
.hero__btn-primary { background: white; color: var(--color-primary); font-weight: 700; }
.hero__btn-primary:hover { background: #f0f0f0; color: var(--color-primary); }
.hero__btn-secondary { border: 2px solid rgba(255,255,255,0.7); color: white; background: transparent; }
.hero__btn-secondary:hover { border-color: white; background: rgba(255,255,255,0.1); color: white; }

/* ===== SECTION ===== */
.section { padding: var(--spacing-2xl) 0; }
.section-title { font-size: 1.5rem; font-weight: 700; margin-bottom: var(--spacing-lg); }
@media (min-width: 640px) { .section-title { font-size: 1.875rem; } }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--spacing-lg); flex-wrap: wrap; gap: var(--spacing-sm); }

/* ===== PRODUCT CARD ===== */
.product-card {
  background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow);
  overflow: hidden; display: flex; flex-direction: column; transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none; color: inherit;
}
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.product-card__image-wrapper { position: relative; aspect-ratio: 4/3; overflow: hidden; }
.product-card__image-placeholder {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  font-size: 3rem; color: var(--color-text-muted);
}
.product-card__body { padding: var(--spacing-md); display: flex; flex-direction: column; flex: 1; gap: var(--spacing-sm); }
.product-card__name { font-weight: 600; font-size: 0.9375rem; color: var(--color-text); }
.product-card__price-row { display: flex; align-items: center; gap: var(--spacing-sm); margin-top: auto; }
.product-card__price { font-size: 1.125rem; font-weight: 700; color: var(--color-text); }
.product-card__compare { font-size: 0.875rem; color: var(--color-text-muted); text-decoration: line-through; }
.product-card__add { margin-top: var(--spacing-sm); }
.product-card__add .btn { width: 100%; }

/* ===== BADGE ===== */
.badge {
  display: inline-flex; align-items: center; padding: 3px 10px;
  border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 600; line-height: 1;
}
.badge--sale { background: var(--color-danger); color: white; }
.badge--new { background: var(--color-accent); color: white; }
.badge--featured { background: var(--color-warning); color: white; }
.product-card__badges { position: absolute; top: var(--spacing-sm); left: var(--spacing-sm); display: flex; flex-direction: column; gap: 4px; }

/* ===== CATEGORY CARD ===== */
.category-card {
  background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow);
  overflow: hidden; text-decoration: none; display: block; transition: all var(--transition);
}
.category-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.category-card__placeholder {
  width: 100%; aspect-ratio: 16/9;
  display: flex; align-items: center; justify-content: center; font-size: 3rem;
}
.category-card__body { padding: var(--spacing-md); }
.category-card__name { font-weight: 600; font-size: 1.0625rem; color: var(--color-text); }
.category-card__desc { font-size: 0.875rem; color: var(--color-text-secondary); margin-top: 4px; }

/* ===== COMING SOON ===== */
.coming-soon {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: var(--spacing-3xl) var(--spacing-md);
  min-height: 400px;
}
.coming-soon__icon { font-size: 4rem; margin-bottom: var(--spacing-lg); }
.coming-soon__title { font-size: 2rem; font-weight: 800; color: var(--color-text); margin-bottom: var(--spacing-md); }
.coming-soon__subtitle { font-size: 1.125rem; color: var(--color-text-secondary); max-width: 480px; margin-bottom: var(--spacing-xl); line-height: 1.7; }
.coming-soon__actions { display: flex; gap: var(--spacing-md); justify-content: center; flex-wrap: wrap; }

/* ===== NOTIFY FORM ===== */
.notify-form { display: flex; gap: var(--spacing-sm); flex-wrap: wrap; justify-content: center; margin-top: var(--spacing-md); }
.notify-form input[type="email"] {
  padding: 10px 16px; border: 2px solid var(--color-border); border-radius: var(--radius);
  font-size: 1rem; min-width: 260px; min-height: 44px; outline: none;
  transition: border-color var(--transition);
}
.notify-form input[type="email"]:focus { border-color: var(--color-border-focus); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }

/* ===== PLACEHOLDER GRADIENTS ===== */
.placeholder-blue { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); }
.placeholder-green { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.placeholder-purple { background: linear-gradient(135deg, #ede9fe 0%, #c4b5fd 100%); }
.placeholder-orange { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); }
.placeholder-pink { background: linear-gradient(135deg, #fce7f3 0%, #fbcfe8 100%); }
.placeholder-teal { background: linear-gradient(135deg, #ccfbf1 0%, #99f6e4 100%); }