@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400&display=swap');

:root {
  --color-white: #FFFFFF;
  --color-black: #0A0A0A;
  --color-gray: #6B7280;
  --color-light-gray: #F9FAFB;
  --font-en: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-jp: "Noto Sans JP", sans-serif;
  --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  --header-height: 80px;
}

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

body {
  font-family: var(--font-en), var(--font-jp);
  font-weight: 300;
  color: var(--color-black);
  background-color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 300;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 3rem;
  text-align: center;
}

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-padding {
  padding: 8rem 0;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 3rem;
  z-index: 100;
  mix-blend-mode: exclusion;
  color: var(--color-white);
  transition: background-color 0.3s ease, mix-blend-mode 0.3s ease;
}

.header.solid {
  background-color: var(--color-white);
  mix-blend-mode: normal;
  color: var(--color-black);
  border-bottom: 1px solid var(--color-light-gray);
}

.header-left,
.header-right {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.menu-btn,
.icon-btn {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: inherit;
}

.menu-btn:hover,
.icon-btn:hover {
  opacity: 0.6;
}

/* Fullscreen Menu */
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-white);
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

.menu-nav {
  text-align: center;
}

.menu-nav li {
  margin-bottom: 2rem;
}

.menu-nav a {
  font-size: 2.5rem;
  color: var(--color-black);
  position: relative;
}

.menu-nav a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-black);
  transition: var(--transition);
}

.menu-nav a:hover::after {
  width: 100%;
}

/* UI Elements */
.btn-primary {
  display: inline-block;
  padding: 1rem 3rem;
  background-color: var(--color-black);
  color: var(--color-white);
  border: 1px solid var(--color-black);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: var(--transition);
}

.btn-primary:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

.btn-secondary {
  display: inline-block;
  padding: 1rem 3rem;
  background-color: transparent;
  color: var(--color-black);
  border: 1px solid var(--color-black);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--color-black);
  color: var(--color-white);
}

/* Hero Section */
.hero {
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-black);
  overflow: hidden;
}

.hero-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
  transition: transform 10s ease;
}

.hero:hover .hero-img {
  transform: scale(1.05);
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  color: var(--color-white);
}

.hero-title {
  font-size: 4rem;
  margin-bottom: 2rem;
  font-weight: 300;
  letter-spacing: 0.1em;
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.product-card {
  display: block;
  text-align: left;
}

.img-wrapper {
  position: relative;
  overflow: hidden;
  margin-bottom: 1rem;
  background-color: var(--color-light-gray);
  aspect-ratio: 3/4;
}

.img-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.5s ease;
}

.img-wrapper .product-img-hover {
  opacity: 0;
}

.product-card:hover .product-img-default {
  opacity: 0;
}

.product-card:hover .product-img-hover {
  opacity: 1;
}

.product-brand {
  font-size: 0.8rem;
  color: var(--color-gray);
  margin-bottom: 0.25rem;
}

.product-name {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.product-price {
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* Footer */
.footer {
  background-color: var(--color-light-gray);
  padding: 4rem 2rem 2rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-nav a {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.footer-social {
  margin-bottom: 2rem;
}

.footer-social a {
  margin: 0 1rem;
  font-size: 1.2rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-gray);
}

/* Responsive */
@media (max-width: 900px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .header {
    padding: 0 1.5rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 600px) {
  .section-padding {
    padding: 5rem 0;
  }

  .container {
    padding: 0 1.5rem;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 1rem;
  }
}

/* Concept Section */
.concept-section {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.concept-text {
  font-size: 2rem;
  line-height: 1.8;
  margin-bottom: 3rem;
}

.concept-img {
  width: 100%;
  height: 600px;
  object-fit: cover;
}

/* Lookbook Preview */
.lookbook-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 4rem;
}

.lookbook-item {
  height: 50vh;
}

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

/* Newsletter */
.newsletter-section {
  text-align: center;
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 8rem 2rem;
}

.newsletter-form {
  max-width: 500px;
  margin: 2rem auto 0;
  display: flex;
  border-bottom: 1px solid var(--color-gray);
}

.newsletter-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--color-white);
  padding: 1rem 0;
  font-size: 1rem;
  outline: none;
}

.newsletter-input::placeholder {
  color: var(--color-gray);
}

.newsletter-btn {
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0 1rem;
}

.newsletter-btn:hover {
  color: var(--color-gray);
}

/* Page Header */
.page-header {
  padding: 12rem 2rem 4rem;
  text-align: center;
}

.page-title {
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: 0.1em;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-light-gray);
  padding-bottom: 1rem;
  margin-bottom: 3rem;
}

.filter-group {
  display: flex;
  gap: 1.5rem;
}

.filter-btn {
  font-size: 0.9rem;
  color: var(--color-gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--color-black);
}

.sort-select {
  border: none;
  background: transparent;
  font-size: 0.9rem;
  color: var(--color-black);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  outline: none;
}

/* Product Grid 3-col */
.product-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem 2rem;
  margin-bottom: 5rem;
}

@media (max-width: 900px) {
  .product-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .filter-group {
    flex-wrap: wrap;
    gap: 1rem;
  }
}

/* Product Detail */
.product-detail-container {
  display: flex;
  gap: 4rem;
  margin-top: 100px;
  padding: 4rem 2rem;
}

.product-images {
  flex: 1;
  display: flex;
  gap: 1rem;
}

.thumbnail-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 80px;
}

.thumbnail {
  cursor: pointer;
  opacity: 0.6;
  transition: var(--transition);
}

.thumbnail:hover,
.thumbnail.active {
  opacity: 1;
}

.main-image {
  flex: 1;
}

.product-info {
  flex: 1;
  padding-top: 2rem;
}

.product-title {
  font-size: 2rem;
  margin-bottom: 1rem;
  font-weight: 300;
}

.product-detail-price {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  letter-spacing: 0.05em;
}

.product-options {
  margin-bottom: 2rem;
}

.option-title {
  font-size: 0.9rem;
  color: var(--color-gray);
  margin-bottom: 0.5rem;
  display: block;
}

.color-swatches {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.swatch {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--color-light-gray);
  cursor: pointer;
  transition: var(--transition);
}

.swatch.black {
  background-color: #000;
}

.swatch.white {
  background-color: #fff;
  border-color: #ccc;
}

.swatch.gray {
  background-color: #888;
}

.swatch:hover,
.swatch.active {
  transform: scale(1.1);
  box-shadow: 0 0 0 2px var(--color-white), 0 0 0 4px var(--color-black);
}

.size-selector {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.size-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-gray);
  cursor: pointer;
  transition: var(--transition);
}

.size-btn:hover,
.size-btn.active {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.add-to-cart-btn {
  width: 100%;
  padding: 1.5rem;
  background-color: var(--color-black);
  color: var(--color-white);
  border: none;
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 3rem;
}

.add-to-cart-btn:hover {
  background-color: var(--color-gray);
}

.product-desc {
  line-height: 1.8;
  margin-bottom: 3rem;
  color: #333;
}

.size-guide-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.size-guide-table th,
.size-guide-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-light-gray);
  font-size: 0.9rem;
}

.size-guide-table th {
  font-weight: 400;
  color: var(--color-gray);
}

/* Related Products */
.related-products {
  padding: 4rem 2rem;
}

@media (max-width: 900px) {
  .product-detail-container {
    flex-direction: column;
  }
}

/* Lookbook Grid */
.lookbook-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 5rem;
}

.lookbook-item-large {
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  position: relative;
  cursor: pointer;
}

.lookbook-item-half {
  width: calc(50% - 0.5rem);
  aspect-ratio: 3/4;
  overflow: hidden;
  position: relative;
  cursor: pointer;
}

.lookbook-item-large img,
.lookbook-item-half img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.lookbook-item-large:hover img,
.lookbook-item-half:hover img {
  transform: scale(1.03);
}

@media (max-width: 768px) {
  .lookbook-item-half {
    width: 100%;
    aspect-ratio: auto;
    height: 50vh;
  }
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(255, 255, 255, 0.95);
  z-index: 200;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: 90%;
  max-height: 90vh;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.lightbox-close {
  position: absolute;
  top: 2rem;
  right: 3rem;
  font-size: 2rem;
  cursor: pointer;
  color: var(--color-black);
  z-index: 201;
}

/* About Page */
.about-section {
  display: flex;
  align-items: center;
  gap: 4rem;
  margin-bottom: 6rem;
}

.about-image {
  flex: 1;
}

.about-text {
  flex: 1;
}

.about-text h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

.about-text .lead {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  font-weight: 400;
}

.about-text p {
  margin-bottom: 1.5rem;
}

.company-section {
  max-width: 800px;
  margin: 0 auto 5rem;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-light-gray);
  text-align: left;
}

.company-table th {
  width: 30%;
  font-weight: 400;
  color: var(--color-gray);
}

@media (max-width: 768px) {
  .about-section {
    flex-direction: column;
  }
  .company-table th,
  .company-table td {
    display: block;
    width: 100%;
  }
  .company-table th {
    padding-bottom: 0.5rem;
    border-bottom: none;
  }
  .company-table td {
    padding-top: 0;
  }
}

/* Contact Page */
.contact-wrapper {
  max-width: 600px;
  margin: 0 auto 5rem;
}

.contact-desc {
  text-align: center;
  margin-bottom: 3rem;
  color: var(--color-gray);
}

.contact-form {
  background-color: var(--color-light-gray);
  padding: 3rem;
}

.form-group {
  margin-bottom: 2rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--color-gray);
  letter-spacing: 0.05em;
}

.form-group .required {
  color: red;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid #ccc;
  background-color: var(--color-white);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.3s ease;
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-black);
}