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

:root {
  --navy: #0A192F;
  --blue: #3B82F6;
  --white: #FFFFFF;
  --gray-50: #F3F4F6;
  --gray-400: #9CA3AF;
  --gray-600: #4B5563;
  --gray-900: #111827;
  --radius: 4px;
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
}

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

/* ─── HEADER ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  padding: 0 24px;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--white);
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-400);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color var(--transition);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--white);
}

/* ─── HERO ─── */
.hero {
  background: var(--navy);
  color: var(--white);
  padding: 96px 24px;
  text-align: center;
}

.hero-content {
  max-width: 680px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--gray-400);
  margin-bottom: 40px;
}

/* ─── TRUST BADGES ─── */
.trust-badges {
  background: var(--white);
  padding: 64px 24px;
  border-bottom: 1px solid var(--gray-50);
}

.badges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  text-align: center;
}

.badge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.badge-icon {
  font-size: 2rem;
  color: var(--blue);
  line-height: 1;
}

.badge-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-desc {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.6;
  max-width: 240px;
}

/* ─── BUTTONS ─── */
.btn-primary {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  padding: 14px 36px;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: background var(--transition), transform var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover,
.btn-primary:focus {
  background: #2563EB;
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-block;
  border: 2px solid var(--navy);
  color: var(--navy);
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: background var(--transition), color var(--transition);
}

.btn-outline:hover,
.btn-outline:focus {
  background: var(--navy);
  color: var(--white);
}

.btn-add-cart {
  background: var(--navy);
  color: var(--white);
  border: none;
  padding: 14px 40px;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn-add-cart:hover:not(:disabled) {
  background: #0d2847;
  transform: translateY(-1px);
}

.btn-add-cart:disabled {
  background: var(--blue);
  cursor: default;
}

/* ─── PRODUCTS ─── */
.products-section {
  background: var(--gray-50);
  padding: 80px 24px;
}

.section-inner {
  max-width: 1120px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.product-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.product-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
}

.product-info {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.product-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
}

.product-price {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--blue);
}

/* ─── PRODUCT DETAIL ─── */
.product-detail {
  padding: 64px 24px;
  background: var(--white);
}

.product-detail-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.product-gallery {
  position: sticky;
  top: 88px;
}

.product-main-img {
  width: 100%;
  border-radius: var(--radius);
  display: block;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.product-category {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin-bottom: 8px;
}

.product-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 12px;
}

.product-price-lg {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 24px;
}

.product-desc {
  color: var(--gray-600);
  margin-bottom: 24px;
  line-height: 1.7;
}

.product-features {
  list-style: none;
  padding: 0;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.product-features li {
  font-size: 0.9375rem;
  color: var(--gray-600);
  padding-left: 20px;
  position: relative;
}

.product-features li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 700;
}

.size-selector {
  margin-bottom: 32px;
}

.size-label {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.size-options {
  display: flex;
  gap: 8px;
}

.size-btn {
  width: 48px;
  height: 48px;
  border: 2px solid var(--gray-400);
  background: var(--white);
  color: var(--gray-900);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.size-btn:hover {
  border-color: var(--navy);
}

.size-btn.selected {
  border-color: var(--navy);
  background: var(--navy);
  color: var(--white);
}

.shipping-returns {
  margin-top: 32px;
  padding: 24px;
  background: var(--gray-50);
  border-radius: var(--radius);
  border-left: 4px solid var(--blue);
}

.shipping-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--navy);
  margin-bottom: 8px;
}

.shipping-text {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.7;
}

/* ─── RELATED PRODUCTS ─── */
.related-products {
  background: var(--gray-50);
  padding: 80px 24px;
}

/* ─── REVIEWS ─── */
.reviews-section {
  background: var(--white);
  padding: 80px 24px;
  border-top: 1px solid var(--gray-50);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.review-card {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.review-stars {
  color: #F59E0B;
  font-size: 1.125rem;
  letter-spacing: 2px;
}

.review-text {
  font-size: 1rem;
  color: var(--gray-900);
  line-height: 1.7;
  font-style: italic;
  flex: 1;
}

.review-author {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-600);
}

/* ─── NEWSLETTER ─── */
.newsletter-section {
  background: var(--navy);
  padding: 80px 24px;
}

.newsletter-box {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.newsletter-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 12px;
}

.newsletter-sub {
  font-size: 1rem;
  color: var(--gray-400);
  margin-bottom: 32px;
}

.newsletter-form {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.newsletter-input {
  flex: 1;
  max-width: 320px;
  padding: 14px 16px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  background: var(--white);
  color: var(--gray-900);
  outline: none;
  transition: border-color var(--transition);
}

.newsletter-input:focus {
  border-color: var(--blue);
}

/* ─── SHOP PAGE ─── */
.shop-page {
  padding: 64px 24px 96px;
  background: var(--gray-50);
}

.shop-page .page-title {
  margin-bottom: 48px;
}

/* ─── ABOUT ─── */
.about-page {
  padding: 80px 24px;
  background: var(--gray-50);
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--navy);
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.about-content {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-content p {
  font-size: 1.0625rem;
  color: var(--gray-600);
  line-height: 1.8;
}

/* ─── CONTACT ─── */
.contact-page {
  padding: 80px 24px;
  background: var(--white);
}

.contact-layout {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  align-items: start;
}

.contact-info-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}

.contact-info-text {
  font-size: 0.9375rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-info-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  margin-top: 20px;
  margin-bottom: 4px;
}

.contact-link {
  color: var(--blue);
  font-weight: 500;
}

.contact-link:hover {
  text-decoration: underline;
}

.contact-address {
  font-style: normal;
  font-size: 0.9375rem;
  color: var(--gray-600);
  line-height: 1.7;
}

.contact-form-wrap {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 40px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-input {
  padding: 12px 16px;
  border: 2px solid var(--gray-400);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--gray-900);
  background: var(--white);
  outline: none;
  transition: border-color var(--transition);
}

.form-input:focus {
  border-color: var(--blue);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* ─── POLICIES ─── */
.policies-page {
  padding: 80px 24px;
  background: var(--gray-50);
}

.policies-inner {
  max-width: 720px;
  margin: 0 auto;
}

.policies-heading {
  font-size: 2rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 48px;
  text-align: center;
}

.policy-section {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.policy-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--gray-50);
}

.policy-text {
  color: var(--gray-600);
  line-height: 1.8;
}

/* ─── FOOTER ─── */
.site-footer {
  background: var(--navy);
  color: var(--white);
  padding: 48px 24px;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-address {
  font-style: normal;
  color: var(--gray-400);
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-address a {
  color: var(--blue);
}

.footer-address a:hover {
  text-decoration: underline;
}

.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.8125rem;
  color: var(--gray-400);
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--white);
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--gray-400);
  margin-top: 8px;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }

  .main-nav {
    gap: 20px;
  }

  .hero {
    padding: 64px 24px;
  }

  .badges-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .newsletter-form {
    flex-direction: column;
    align-items: stretch;
  }

  .newsletter-input {
    max-width: 100%;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .product-detail-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .product-gallery {
    position: static;
  }

  .size-options {
    flex-wrap: wrap;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .contact-form-wrap {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .nav-link {
    font-size: 0.75rem;
  }

  .main-nav {
    gap: 14px;
  }
}