:root {
  --text: #151515;
  --muted: #6b6b6b;
  --line: #e5e0d9;
  --surface: #ffffff;
  --surface-soft: #f7f4f0;
  --surface-blue: #eef5f7;
  --accent: #6c0000;
  --accent-strong: #4d0000;
  --ink: #1c0f0f;
  --danger: #9d2c2c;
  --shadow: 0 18px 48px rgba(16, 24, 24, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

body.no-scroll {
  overflow: hidden;
}

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

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

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.sr-only {
  position: absolute;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  width: 1px;
  height: 1px;
  white-space: nowrap;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto minmax(220px, 1fr) auto auto;
  gap: 20px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.95);
  padding: 16px 32px;
  backdrop-filter: blur(14px);
}

.site-header > * {
  min-width: 0;
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  min-width: 210px;
  font-weight: 700;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--text);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 12px;
  line-height: 1;
}

.brand-logo {
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  object-fit: contain;
  background: var(--surface);
}

.search input {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  padding: 12px 14px;
  width: 100%;
  min-width: 0;
  min-height: 44px;
  color: var(--text);
}

.search input:focus {
  outline: 2px solid rgba(0, 108, 103, 0.25);
  border-color: var(--accent);
  background: var(--surface);
}

.header-nav,
.header-actions,
.site-footer nav {
  display: flex;
  gap: 18px;
  align-items: center;
}

.header-nav a,
.site-footer a {
  color: var(--muted);
  font-size: 14px;
}

.header-nav a:hover,
.site-footer a:hover {
  color: var(--text);
}

.icon-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  padding: 10px 12px;
  min-height: 42px;
  color: var(--text);
}

.icon-button:hover {
  border-color: var(--accent);
}

main {
  margin: 0 auto;
  padding: 22px 32px 56px;
  max-width: 1480px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumbs a:hover {
  color: var(--text);
  text-decoration: underline;
}

.product-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 440px);
  gap: 38px;
  align-items: start;
}

.gallery {
  min-width: 0;
}

.gallery-main {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  aspect-ratio: 1 / 1;
}

.gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
}

.gallery-nav {
  position: absolute;
  top: 50%;
  z-index: 3;
  display: grid;
  place-items: center;
  transform: translateY(-50%);
  border: 1px solid rgba(21, 21, 21, 0.14);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
  width: 44px;
  height: 44px;
  color: var(--text);
  font-size: 34px;
  line-height: 1;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.gallery-nav:hover {
  background: var(--surface);
}

.gallery-nav.previous {
  left: 18px;
}

.gallery-nav.next {
  right: 18px;
}

.thumbnail-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(72px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.thumbnail {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  padding: 0;
  aspect-ratio: 1 / 1;
}

.thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumbnail.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 108, 103, 0.16);
}

.product-panel {
  position: sticky;
  top: 96px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 26px;
  box-shadow: var(--shadow);
}

.seller-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
}

.seller-avatar {
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--surface-blue);
  width: 42px;
  height: 42px;
  color: var(--accent-strong);
  font-weight: 700;
}

.muted {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.seller-name {
  margin: 0;
  font-weight: 700;
}

.product-eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--ink);
  font-size: 34px;
  line-height: 1.15;
}

.product-subtitle {
  margin: 8px 0 22px;
  color: var(--muted);
}

.price-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
}

.price {
  font-size: 26px;
  font-weight: 700;
}

.badge {
  border-radius: 999px;
  background: var(--surface-blue);
  padding: 6px 10px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0 0 24px;
}

.spec-grid div {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.spec-grid dt {
  color: var(--muted);
  font-size: 13px;
}

.spec-grid dd {
  margin: 4px 0 0;
  font-weight: 700;
}

.cta-group {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: 1px solid var(--text);
  border-radius: 6px;
  padding: 13px 16px;
  min-height: 48px;
  font-weight: 700;
  text-align: center;
}

.button.primary {
  border-color: var(--text);
  background: var(--text);
  color: #fff;
}

.button.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.button.secondary {
  background: var(--surface);
  color: var(--text);
}

.button.secondary:hover,
.button.ghost:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.button.ghost {
  border-color: var(--line);
  background: var(--surface-soft);
  color: var(--text);
}

.button.ghost.is-saved {
  border-color: var(--accent);
  background: var(--surface-blue);
  color: var(--accent-strong);
}

.service-note {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 14px;
}

.accordion {
  border-top: 1px solid var(--line);
}

.accordion-trigger {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  padding: 16px 0;
  width: 100%;
  color: var(--text);
  font-weight: 700;
  text-align: left;
}

.accordion-trigger span::before {
  content: "+";
}

.accordion-trigger[aria-expanded="true"] span::before {
  content: "-";
}

.accordion-panel {
  border-bottom: 1px solid var(--line);
  padding: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
}

.accordion-panel p {
  margin: 0;
}

.article-box {
  margin-top: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 24px;
  max-width: 860px;
  box-shadow: var(--shadow);
}

.article-box-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.article-box-kicker {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.article-box h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.25;
}

.article-box-body p {
  margin: 0;
  color: var(--muted);
}

.article-box-body {
  display: grid;
  gap: 22px;
}

.article-box-body section {
  display: grid;
  gap: 12px;
}

.article-box-body h3 {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.3;
}

.article-box-body ul,
.article-box-body ol {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.article-box-body li strong {
  color: var(--text);
}

.faq-list details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}

.faq-list details:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
}

.faq-list details p {
  margin-top: 8px;
}

.review-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.review-list h3 {
  grid-column: 1 / -1;
}

.review-list figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  padding: 16px;
}

.review-list blockquote {
  margin: 0;
  color: var(--text);
}

.review-list figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 24px 32px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 1120px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .search {
    grid-column: 1 / -1;
    order: 3;
  }

  .header-nav {
    display: none;
  }

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

  .product-panel {
    position: static;
  }
}

@media (max-width: 760px) {
  .site-header {
    padding: 14px 16px;
  }

  .brand {
    min-width: 0;
  }

  .brand span:last-child {
    display: none;
  }

  .header-actions {
    gap: 6px;
  }

  .icon-button {
    padding: 9px;
  }

  main {
    padding: 16px 16px 36px;
  }

  .product-layout {
    gap: 22px;
  }

  .gallery-nav {
    width: 38px;
    height: 38px;
    font-size: 28px;
  }

  .gallery-nav.previous {
    left: 10px;
  }

  .gallery-nav.next {
    right: 10px;
  }

  .thumbnail-strip {
    grid-template-columns: repeat(4, minmax(58px, 1fr));
  }

  .product-panel {
    padding: 20px;
  }

  h1 {
    font-size: 28px;
  }

  .spec-grid {
    grid-template-columns: 1fr;
  }

  .review-list {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 22px 16px;
  }
}

@media (max-width: 600px) {
  .site-header {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .search {
    grid-column: auto;
  }

  .header-actions {
    justify-content: flex-start;
  }

  .thumbnail-strip {
    grid-template-columns: repeat(2, minmax(96px, 1fr));
  }
}