:root {
  --bg: #f7f8fa;
  --page-bg: #eef0f3;
  --surface: #ffffff;
  --fg: oklch(0.18 0.005 60);
  --fg-2: oklch(0.40 0.005 60);
  --fg-3: oklch(0.58 0.005 60);
  --hairline: oklch(0.88 0.008 240);
  --accent: #D7332B;
}

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

html, body {
  font-family: "Inter Tight", system-ui, sans-serif;
  background: var(--page-bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

body {
  max-width: 1280px;
  margin: 0 auto;
  background: var(--bg);
  min-height: 100vh;
}

a { color: var(--fg-2); text-decoration: none; }
a:hover { color: var(--fg); }
button { font-family: inherit; }
ul { list-style: none; }

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 56px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in oklch, var(--accent) 60%, black) 100%);
  display: grid;
  place-items: center;
  box-shadow: 0 1px 0 rgba(255,255,255,.4) inset, 0 6px 14px -6px var(--accent);
}

.brand-name {
  font-family: "Instrument Serif", serif;
  font-size: 22px;
  line-height: 1;
  letter-spacing: -0.01em;
}

.brand-dot {
  font-style: italic;
  color: var(--accent);
}

.nav-desktop {
  display: flex;
  gap: 32px;
  font-size: 13px;
  letter-spacing: 0.01em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.icon-btn {
  position: relative;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 1px solid var(--hairline);
  background: transparent;
  display: grid;
  place-items: center;
  color: var(--fg);
  cursor: pointer;
}

.cart-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  background: var(--accent);
  color: white;
  font-size: 9px;
  width: 14px;
  height: 14px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  font-weight: 600;
}

/* Main Content */
.main-content {
  padding: 48px 56px 80px;
}

.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.08em;
  margin-bottom: 32px;
}

.breadcrumb .active { color: var(--fg-2); }
.breadcrumb .sep { opacity: 0.5; }

.product-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 360px) minmax(0, 1.1fr);
  gap: 56px;
  align-items: start;
}

/* Product Info */
.edition-badge {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}

.product-title {
  font-family: "Instrument Serif", serif;
  font-size: clamp(40px, 4vw, 60px);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}

.title-italic {
  font-style: italic;
  color: var(--fg-2);
}

.product-desc {
  font-size: 15px;
  line-height: 1.55;
  color: var(--fg-2);
  margin-bottom: 28px;
  max-width: 42ch;
  text-wrap: pretty;
}

/* Features List */
.features-list {
  display: grid;
  gap: 4px;
}

.features-list li {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--hairline);
  align-items: baseline;
}

.features-list li:first-child {
  border-top: 1px solid var(--fg);
}

.feat-key {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fg-3);
}

.feat-desc {
  font-size: 14px;
  color: var(--fg-2);
}

.feat-val {
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}

/* Configurator */
.configurator {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 16px;
  padding: 24px;
  display: grid;
  gap: 20px;
  position: sticky;
  top: 96px;
}

.price-section {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.price-current {
  font-family: "Instrument Serif", serif;
  font-size: 36px;
  line-height: 1;
  letter-spacing: -0.01em;
}

.price-mrp {
  font-size: 12px;
  color: var(--fg-3);
  margin-top: 4px;
  font-family: "JetBrains Mono", monospace;
}

.discount { color: var(--accent); }

.price-tax {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: var(--fg-3);
  letter-spacing: 0.1em;
  text-align: right;
}

.divider {
  height: 1px;
  background: var(--hairline);
}

.picker-group { display: grid; gap: 10px; }

.picker-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
}

.picker-value {
  color: var(--fg);
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 11px;
}

.color-options, .capacity-options {
  display: flex;
  gap: 10px;
}

.color-btn, .capacity-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--fg);
  text-align: left;
  transition: all .15s ease;
  font-size: 13px;
}

.color-btn.active, .capacity-btn.active {
  border: 1.5px solid var(--accent);
  background: var(--surface);
}

.swatch {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.1), inset 0 -2px 3px rgba(0,0,0,.25);
  flex-shrink: 0;
}

.capacity-btn {
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
}

.cap-id {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.cap-price {
  font-size: 11px;
  color: var(--fg-3);
  font-family: "JetBrains Mono", monospace;
}

/* Quantity Stepper */
.qty-stepper {
  display: flex;
  align-items: center;
  border: 1px solid var(--hairline);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
}

.qty-btn {
  width: 48px;
  height: 44px;
  display: grid;
  place-items: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--fg);
}

.qty-btn:disabled {
  cursor: not-allowed;
  color: var(--fg-3);
  opacity: 0.4;
}

.qty-value {
  flex: 1;
  text-align: center;
  font-size: 16px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* Buy Button */
.buy-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.005em;
  box-shadow: 0 1px 0 rgba(255,255,255,.25) inset, 0 8px 24px -8px var(--accent);
  transition: all .12s ease;
}

.buy-btn:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 rgba(255,255,255,.2) inset, 0 2px 6px -2px var(--accent);
}

.buy-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.buy-price {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  background: rgba(255,255,255,.15);
  padding: 4px 10px;
  border-radius: 6px;
  font-variant-numeric: tabular-nums;
}

/* Reassurance */
.reassurance {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--hairline);
  font-size: 11px;
  color: var(--fg-3);
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.04em;
}

/* Product Image */
.product-image-section {
  position: sticky;
  top: 96px;
}

.product-image-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4/5;
  background: radial-gradient(120% 80% at 50% 40%, oklch(0.96 0.005 60) 0%, oklch(0.93 0.005 60) 60%, oklch(0.90 0.005 60) 100%);
  border-radius: 32px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--hairline);
}

.grid-texture {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(oklch(0.85 0.005 60 / .25) 1px, transparent 1px), linear-gradient(90deg, oklch(0.85 0.005 60 / .25) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(60% 60% at 50% 50%, black, transparent);
}

.product-hero-img {
  position: relative;
  width: 85%;
  height: 85%;
  object-fit: contain;
  z-index: 1;
}

.img-label {
  position: absolute;
  bottom: 16px;
  left: 16px;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: var(--fg-3);
  letter-spacing: 0.06em;
  z-index: 2;
}

/* Detail Strip */
.detail-strip {
  margin-top: 96px;
  padding-top: 48px;
  border-top: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.detail-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: var(--fg-3);
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.detail-title {
  font-family: "Instrument Serif", serif;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.detail-desc {
  font-size: 13px;
  line-height: 1.55;
  color: var(--fg-2);
}

/* Footer */
.footer {
  border-top: 1px solid var(--hairline);
  padding: 56px 56px 32px;
  background: var(--bg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-tagline {
  font-family: "Instrument Serif", serif;
  font-size: 24px;
  margin-bottom: 8px;
}

.footer-copy {
  font-size: 13px;
  color: var(--fg-2);
  line-height: 1.6;
  max-width: 280px;
}

.footer-heading {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 14px;
}

.footer-col ul {
  display: grid;
  gap: 8px;
}

.footer-col a {
  font-size: 13px;
  color: var(--fg-2);
}

.footer-bottom {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 11px;
  color: var(--fg-3);
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.04em;
}

/* ─── Mobile Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  body {
    max-width: 100%;
  }

  .header {
    padding: 16px 20px;
  }

  .nav-desktop { display: none; }
  .search-btn { display: none; }

  .header-actions { gap: 12px; }

  .main-content {
    padding: 24px 20px 40px;
  }

  .breadcrumb { display: none; }

  .product-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .product-info { order: 1; }

  .product-title {
    font-size: 38px;
    margin-bottom: 12px;
  }

  .product-desc {
    font-size: 14px;
    margin-bottom: 24px;
  }

  .product-image-section {
    order: 2;
    position: relative;
    top: 0;
    margin: 24px 0 32px;
  }

  .product-image-wrapper {
    aspect-ratio: 1/1;
    border-radius: 24px;
  }

  .features-list {
    order: 3;
    margin-bottom: 32px;
  }

  .features-list li {
    grid-template-columns: 72px 1fr auto;
    gap: 12px;
    padding: 10px 0;
  }

  .configurator {
    order: 4;
    position: relative;
    top: 0;
    border: none;
    padding: 0;
    background: transparent;
    border-radius: 0;
  }

  .price-section {
    padding: 16px 0;
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
    margin-bottom: 16px;
  }

  .price-current { font-size: 32px; }

  .divider { display: none; }

  .buy-btn {
    padding: 16px 20px;
    font-size: 15px;
  }

  .detail-strip {
    margin-top: 48px;
    padding-top: 32px;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .footer {
    padding: 32px 20px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .footer-brand { display: none; }

  .footer-bottom {
    margin-top: 28px;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .product-title { font-size: 32px; }

  .features-list li {
    grid-template-columns: 1fr auto;
  }

  .feat-key { display: none; }

  .detail-strip {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}