/* =====================================================================
   AE PERFORMANCE SUPPLY — Design System
   Light steel-gray surface, technical/spec-sheet character.
   Mobile-first; breakpoints at 640 / 960 / 1280.
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@600;700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* Color */
  --bg:            #F4F5F6;
  --surface:       #FFFFFF;
  --surface-sunk:  #EBEDEF;
  --ink:           #15191D;
  --ink-muted:     #565F68;
  --ink-faint:     #8A929A;
  --border:        #DADFE3;
  --border-strong: #C3C9CE;

  --accent:        #FF5A1F;
  --accent-dark:   #C7430F;
  --accent-ink:    #FFFFFF;
  --accent-tint:   #FFEDE4;

  --secondary:     #1C4E80;
  --secondary-tint:#E6EEF6;

  --success:       #1F8A55;
  --success-tint:  #E4F5EC;
  --warning:       #B4790A;
  --warning-tint:  #FBF0DC;
  --danger:        #C6293B;
  --danger-tint:   #FCE8EA;

  /* Type */
  --font-display: 'Barlow Condensed', 'Arial Narrow', sans-serif;
  --font-body:    'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  /* Scale */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 2px rgba(21,25,29,0.05), 0 4px 14px rgba(21,25,29,0.06);
  --shadow-pop:  0 8px 28px rgba(21,25,29,0.14);
  --max-width: 1280px;
  --header-h: 64px;
}

/* Reset ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--secondary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; cursor: pointer; }
:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.05;
  margin: 0;
  color: var(--ink);
}
.mono { font-family: var(--font-mono); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -48px;
  background: var(--ink); color: #fff; padding: 10px 16px;
  border-radius: var(--radius-sm); z-index: 200; transition: top 0.15s ease;
}
.skip-link:focus { top: 12px; }

/* =====================================================================
   Utility bar + header + mega-nav
   ===================================================================== */

.utility-bar {
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  text-align: center;
  padding: 7px 12px;
  letter-spacing: 0.02em;
}
.utility-bar strong { color: var(--accent); }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.site-header__row {
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: var(--ink);
}
.logo span { color: var(--accent); }

.main-nav { flex: 1; display: none; }
.main-nav__list { display: flex; align-items: center; gap: 4px; }
.main-nav__link {
  display: flex; align-items: center; gap: 6px;
  color: var(--ink);
  font-weight: 600; font-size: 14.5px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}
.main-nav__link:hover, .main-nav__link:focus-visible { background: var(--surface-sunk); text-decoration: none; }
.main-nav__link .chev { width: 9px; height: 9px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg); margin-top: -3px; transition: transform 0.15s ease; }
.nav-item.is-open .main-nav__link .chev { transform: rotate(-135deg); margin-top: 3px; }

.header-actions { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  background: transparent; border: none; color: var(--ink);
  position: relative;
}
.icon-btn:hover { background: var(--surface-sunk); }
.icon-btn svg { width: 20px; height: 20px; }
.cart-count {
  position: absolute; top: 2px; right: 2px;
  background: var(--accent); color: #fff;
  font-size: 10px; font-weight: 700; line-height: 1;
  min-width: 16px; height: 16px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
}
.menu-toggle { display: inline-flex; }

/* Mega nav panel */
.mega-panel {
  display: none;
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-pop);
}
.nav-item.is-open .mega-panel { display: block; }
.mega-panel__grid {
  max-width: var(--max-width); margin: 0 auto;
  padding: 28px 20px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.mega-col__title {
  font-family: var(--font-display);
  font-size: 14px; font-weight: 700; letter-spacing: 0.04em;
  color: var(--accent-dark);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.mega-col__list li { margin-bottom: 2px; }
.mega-col__list a {
  display: block; color: var(--ink); font-size: 14px; padding: 5px 2px;
  border-radius: var(--radius-sm);
}
.mega-col__list a:hover { color: var(--accent-dark); text-decoration: none; padding-left: 6px; }

@media (min-width: 960px) {
  .main-nav { display: block; }
  .menu-toggle { display: none; }
}

/* Mobile drawer nav */
.mobile-nav {
  display: none;
  position: fixed; inset: 0; z-index: 150;
  background: rgba(21,25,29,0.4);
}
.mobile-nav.is-open { display: block; }
.mobile-nav__panel {
  position: absolute; top: 0; left: 0; bottom: 0; width: 86%; max-width: 360px;
  background: var(--surface); overflow-y: auto; padding: 16px;
  box-shadow: var(--shadow-pop);
}
.mobile-nav__close { margin-left: auto; display: block; }
.mobile-cat { border-bottom: 1px solid var(--border); }
.mobile-cat__btn {
  width: 100%; display: flex; justify-content: space-between; align-items: center;
  background: none; border: none; padding: 14px 4px; font-weight: 600; text-align: left;
  color: var(--ink);
}
.mobile-cat__panel { display: none; padding: 0 4px 14px 12px; }
.mobile-cat.is-open .mobile-cat__panel { display: block; }
.mobile-cat__panel a { display: block; padding: 8px 0; color: var(--ink-muted); font-size: 14.5px; }

/* =====================================================================
   Breadcrumb
   ===================================================================== */
.breadcrumb {
  padding: 14px 0;
  font-size: 13px;
  color: var(--ink-faint);
}
.breadcrumb a { color: var(--ink-muted); }
.breadcrumb .sep { margin: 0 6px; }
.breadcrumb .current { color: var(--ink); font-weight: 600; }

/* =====================================================================
   Buttons
   ===================================================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--radius-sm);
  font-weight: 700; font-size: 15px;
  padding: 13px 22px;
  border: 1px solid transparent;
  transition: transform 0.08s ease, background 0.15s ease, border-color .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: var(--accent-dark); }
.btn--secondary { background: var(--surface); color: var(--ink); border-color: var(--border-strong); }
.btn--secondary:hover { border-color: var(--ink); }
.btn--block { width: 100%; }
.btn--lg { padding: 16px 24px; font-size: 16px; }

/* =====================================================================
   Footer
   ===================================================================== */
.site-footer { background: var(--ink); color: #C6CCD2; margin-top: 64px; }
.site-footer__grid {
  padding: 48px 0 24px; display: grid; gap: 32px;
  grid-template-columns: 1fr; 
}
.site-footer h4 { color: #fff; font-size: 13px; letter-spacing: 0.05em; margin-bottom: 14px; }
.site-footer a { color: #C6CCD2; font-size: 14px; }
.site-footer ul li { margin-bottom: 8px; }
.site-footer__bottom {
  border-top: 1px solid #2A3138; padding: 18px 0; font-size: 12.5px; color: #8A929A;
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
}
.payment-icons { display: flex; gap: 8px; align-items: center; }
.payment-icons .chip {
  font-family: var(--font-mono); font-size: 11px; border: 1px solid #3A424A;
  padding: 3px 8px; border-radius: var(--radius-sm); color: #C6CCD2;
}
@media (min-width: 720px) {
  .site-footer__grid { grid-template-columns: 2fr repeat(3, 1fr); }
}

/* =====================================================================
   Responsive helpers
   ===================================================================== */
.hide-mobile { display: none; }
@media (min-width: 960px) { .hide-mobile { display: initial; } .hide-desktop { display: none; } }

/* =====================================================================
   Toast (shared: product add-to-cart, cart/checkout confirmations)
   ===================================================================== */
.ae-toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 16px);
  background: var(--ink); color: #fff; font-size: 14px; font-weight: 500;
  padding: 13px 20px; border-radius: var(--radius-md); box-shadow: var(--shadow-pop);
  opacity: 0; pointer-events: none; transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 999; max-width: min(90vw, 380px); text-align: center;
}
.ae-toast.is-visible { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.ae-toast--error { background: var(--danger); }