/* === Reset & Base === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-best-price: #16a34a;
  --color-best-price-bg: #f0fdf4;
  --color-dtc: #9333ea;
  --color-dtc-bg: #faf5ff;
  --color-hero-bg: #0f172a;
  --color-hero-text: #ffffff;
  --color-card-bg: #ffffff;
  --color-sidebar-bg: #f8fafc;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --nav-height: 60px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

/* === Navigation === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--color-text-light);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* === Main Content === */
.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Hero === */
.hero {
  background: var(--color-hero-bg);
  color: var(--color-hero-text);
  padding: 48px 24px;
  margin: 0 -24px 32px;
  text-align: center;
}

.hero h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.hero p {
  font-size: 16px;
  color: #94a3b8;
}

/* === Homepage Layout === */
.home-layout {
  display: flex;
  gap: 32px;
  padding: 32px 0;
}

/* === Sidebar === */
.sidebar {
  width: 200px;
  flex-shrink: 0;
}

.sidebar h2 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-lighter);
  margin-bottom: 12px;
}

.sidebar-links {
  list-style: none;
}

.sidebar-links li {
  margin-bottom: 4px;
}

.sidebar-links a {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--color-text-light);
  transition: background 0.15s, color 0.15s;
}

.sidebar-links a:hover {
  background: var(--color-sidebar-bg);
  color: var(--color-text);
  text-decoration: none;
}

.sidebar-links a.active {
  background: var(--color-accent);
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
}

/* === Product Grid === */
.product-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

/* === Product Card === */
.product-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}

.product-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.product-card a {
  color: inherit;
  text-decoration: none;
}

.product-card-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--color-border-light);
}

.product-card-image-placeholder {
  width: 100%;
  aspect-ratio: 1;
  background: var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-lighter);
  font-size: 14px;
}

.product-card-body {
  padding: 14px;
}

.product-card-brand {
  font-size: 12px;
  color: var(--color-text-lighter);
  margin-bottom: 2px;
}

.product-card-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.3;
}

.product-card-price {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 600;
}

.product-card-retailers {
  font-size: 12px;
  color: var(--color-text-lighter);
  margin-left: 8px;
  font-weight: 400;
}

/* === Product Detail === */
.product-detail {
  display: flex;
  gap: 40px;
  padding: 32px 0;
}

.product-detail-image {
  width: 45%;
  flex-shrink: 0;
}

.product-detail-image img {
  width: 100%;
  border-radius: 10px;
  background: var(--color-border-light);
}

.product-detail-image-placeholder {
  width: 100%;
  aspect-ratio: 1;
  background: var(--color-border-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-lighter);
}

.product-detail-info {
  flex: 1;
}

.product-detail-brand {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-bottom: 4px;
}

.product-detail-brand a {
  color: var(--color-accent);
}

.product-detail-name {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.product-detail-description {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 1.6;
}

/* === Price Table === */
.price-table-header {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
}

.price-table {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.price-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border-light);
  gap: 12px;
}

.price-row:last-child {
  border-bottom: none;
}

.price-row-best {
  background: var(--color-best-price-bg);
}

.price-row-dtc {
  background: var(--color-dtc-bg);
}

.price-row-retailer {
  flex: 1;
}

.price-row-retailer-name {
  font-size: 14px;
  font-weight: 500;
}

.price-row-badge {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  display: block;
  margin-bottom: 2px;
}

.price-row-badge-best {
  color: var(--color-best-price);
}

.price-row-badge-dtc {
  color: var(--color-dtc);
}

.price-row-price-area {
  text-align: right;
  min-width: 100px;
}

.price-row-price {
  font-size: 16px;
  font-weight: 700;
}

.price-row-shipping {
  font-size: 11px;
  color: var(--color-text-lighter);
}

.price-row-shipping-best {
  color: var(--color-best-price);
}

.price-row-shipping-dtc {
  color: var(--color-dtc);
}

.price-row-cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s;
}

.price-row-cta:hover {
  text-decoration: none;
}

.price-row-cta-primary {
  background: var(--color-accent);
  color: #fff;
}

.price-row-cta-primary:hover {
  background: var(--color-accent-hover);
}

.price-row-cta-secondary {
  background: var(--color-border-light);
  color: var(--color-text);
}

.price-row-cta-secondary:hover {
  background: var(--color-border);
}

.price-table-footer {
  font-size: 12px;
  color: var(--color-text-lighter);
  margin-top: 10px;
}

/* === Breadcrumbs === */
.breadcrumbs {
  font-size: 13px;
  color: var(--color-text-lighter);
  padding: 16px 0;
}

.breadcrumbs a {
  color: var(--color-text-lighter);
}

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

.breadcrumbs .separator {
  margin: 0 6px;
}

/* === Brand Page === */
.brand-header {
  padding: 32px 0 24px;
}

.brand-name {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.brand-meta {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-bottom: 16px;
}

.brand-bio {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 640px;
}

/* === Category Page === */
.category-header {
  padding: 32px 0 24px;
}

.category-name {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.category-description {
  font-size: 15px;
  color: var(--color-text-light);
}

/* === About Page === */
.about-content {
  max-width: 640px;
  padding: 32px 0;
}

.about-content h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.about-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* === Brands Index === */
.brands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 32px 0;
}

.brand-card {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
  transition: box-shadow 0.2s;
}

.brand-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.brand-card a {
  color: inherit;
  text-decoration: none;
}

.brand-card-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.brand-card-meta {
  font-size: 12px;
  color: var(--color-text-lighter);
  margin-bottom: 8px;
}

.brand-card-bio {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
  padding: 32px 0;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.site-footer p {
  font-size: 13px;
  color: var(--color-text-lighter);
}

.footer-disclaimer {
  margin-top: 8px;
  font-size: 12px;
}

/* === Mobile Nav Toggle === */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

/* === Responsive === */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 12px 24px;
    gap: 0;
  }

  .nav-links.nav-open {
    display: flex;
  }

  .nav-links li a {
    display: block;
    padding: 10px 0;
  }

  .home-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .sidebar-links {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .product-detail {
    flex-direction: column;
  }

  .product-detail-image {
    width: 100%;
  }

  .price-row {
    flex-wrap: wrap;
  }

  .hero h1 {
    font-size: 22px;
  }
}