/* ==========================================================================
   3D Gear — design tokens
   ========================================================================== */
:root {
  --bg: #F7F7F5;
  --surface: #FFFFFF;
  --ink: #14151A;
  --muted: #6B7280;
  --line: #E4E4E0;
  --accent: #2456DB;
  --accent-ink: #FFFFFF;
  --danger: #B3261E;

  --font-display: "Space Grotesk", "Arial Narrow", sans-serif;
  --font-body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  --radius: 3px;
  --max-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Focus states — always visible */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ==========================================================================
   Registration mark — signature element
   ========================================================================== */
.regmark {
  position: relative;
}
.regmark::before,
.regmark::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--ink);
  opacity: 0.5;
}
.regmark::before { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.regmark::after { bottom: -1px; right: -1px; border-left: none; border-top: none; }

/* ==========================================================================
   Header / nav
   ========================================================================== */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.logo .dot { color: var(--accent); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  font-size: 0.9rem;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}
.cart-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.cart-count {
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 100px;
  padding: 1px 8px;
  font-size: 0.75rem;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  border-bottom: 1px solid var(--line);
  padding: 96px 0 72px;
  position: relative;
  overflow: hidden;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}
.hero p.lede {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 44ch;
  margin: 0 0 32px;
}
.hero-visual {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual svg { width: 55%; height: 55%; }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 13px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary {
  background: var(--ink);
  color: var(--surface);
}
.btn-primary:hover { background: var(--accent); }
.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-block { width: 100%; justify-content: center; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ==========================================================================
   Section headings
   ========================================================================== */
.section {
  padding: 72px 0;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0;
  letter-spacing: -0.01em;
}
.section-head .view-all {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

/* ==========================================================================
   Product grid & cards
   ========================================================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.product-card {
  background: var(--surface);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.product-card .thumb {
  aspect-ratio: 1;
  background: var(--bg);
  border: 1px solid var(--line);
  overflow: hidden;
}
.product-card .thumb img { width: 100%; height: 100%; object-fit: contain; padding: 12px; }
.product-card .cat {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.product-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0;
  font-weight: 600;
}
.product-card .price {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}
.product-card .oos {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--danger);
}
.product-card a.card-link {
  display: block;
  margin-top: auto;
}

/* ==========================================================================
   Filters
   ========================================================================== */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.filter-chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  cursor: pointer;
  color: var(--muted);
}
.filter-chip:hover { border-color: var(--ink); color: var(--ink); }
.filter-chip.active {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}

/* ==========================================================================
   Product detail page
   ========================================================================== */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  padding: 56px 0;
}
.product-detail .thumb-large {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-detail .thumb-large img { width: 60%; }
.product-detail .cat {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.product-detail h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin: 8px 0 16px;
  letter-spacing: -0.01em;
}
.product-detail .price {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  margin-bottom: 20px;
}
.product-detail .desc {
  color: var(--muted);
  margin-bottom: 28px;
  max-width: 50ch;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.spec-table tr { border-bottom: 1px solid var(--line); }
.spec-table td { padding: 10px 0; }
.spec-table td:first-child { color: var(--muted); width: 40%; }
.qty-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}
.qty-stepper {
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
}
.qty-stepper button {
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font-mono);
}
.qty-stepper button:hover { background: var(--bg); }
.qty-stepper input {
  width: 44px;
  text-align: center;
  border: none;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  height: 40px;
  font-family: var(--font-mono);
}

/* ==========================================================================
   Cart page
   ========================================================================== */
.cart-layout {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 48px;
  padding: 56px 0;
  align-items: start;
}
.cart-line {
  display: grid;
  grid-template-columns: 72px 1fr auto auto;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.cart-line .thumb {
  width: 72px;
  height: 72px;
  border: 1px solid var(--line);
  background: var(--bg);
}
.cart-line .thumb img { padding: 8px; }
.cart-line h4 { margin: 0 0 4px; font-family: var(--font-display); font-size: 1rem; }
.cart-line .line-price { font-family: var(--font-mono); font-size: 0.9rem; }
.cart-line .remove {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
}
.cart-summary {
  border: 1px solid var(--line);
  padding: 24px;
  background: var(--surface);
  position: sticky;
  top: 96px;
}
.cart-summary h3 {
  font-family: var(--font-display);
  margin: 0 0 20px;
  font-size: 1.1rem;
}
.summary-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.summary-row.total {
  font-size: 1.1rem;
  font-weight: 600;
  border-bottom: none;
  padding-top: 16px;
}
.empty-state {
  text-align: center;
  padding: 96px 24px;
  color: var(--muted);
}
.empty-state h2 {
  font-family: var(--font-display);
  color: var(--ink);
}

/* ==========================================================================
   About / footer
   ========================================================================== */
.about-band {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.about-band .container {
  padding: 64px 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.about-item .eyebrow { margin-bottom: 8px; }
.about-item h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 8px;
}
.about-item p { color: var(--muted); margin: 0; font-size: 0.92rem; }

.site-footer {
  padding: 40px 0;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 860px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 260px; margin: 0 auto; }
  .product-detail { grid-template-columns: 1fr; }
  .cart-layout { grid-template-columns: 1fr; }
  .cart-summary { position: static; }
  .about-band .container { grid-template-columns: 1fr; }
  .main-nav { gap: 16px; }
}
@media (max-width: 560px) {
  .main-nav a:not(.cart-link) { display: none; }
  .cart-line { grid-template-columns: 56px 1fr; }
  .cart-line .line-price { grid-column: 2; }
  .cart-line .remove { grid-column: 2; justify-self: start; }
}