/* ==========================================================================
   Fonts & Variables
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500&family=Noto+Sans+SC:wght@300;400;500&display=swap');

:root {
  /* Color Palette */
  --bg-color: #ffffff;
  --bg-secondary: #f9f9f9;
  --text-primary: #333333;
  --text-secondary: #666666;
  --accent-color: #8e8e8e; /* 莫兰迪灰 */
  --border-color: #e5e5e5;
  
  /* Typography */
  --font-en: 'Montserrat', sans-serif;
  --font-cn: 'Noto Sans SC', sans-serif;
  
  /* Spacing */
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --container-width: 1400px;
  
  /* Animation */
  --transition-fast: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ==========================================================================
   Global Reset & Base Styles (Overriding Pico.css where necessary)
   ========================================================================== */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-cn), var(--font-en);
  background-color: var(--bg-color);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Reset */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-en), var(--font-cn);
  font-weight: 300;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-weight: 300;
  margin-bottom: var(--spacing-sm);
}

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  cursor: pointer;
}

a:hover {
  color: var(--accent-color);
}

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

/* Layout Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
}

.section {
  padding: var(--spacing-lg) 0;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
  padding: 1.5rem 0;
}

.site-header.scrolled {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #000;
}

.main-nav {
  display: flex;
  gap: 3rem;
}

.nav-link {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -4px;
  left: 0;
  background-color: var(--text-primary);
  transition: width var(--transition-fast);
}

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

/* ==========================================================================
   Home Page
   ========================================================================== */
/* Hero Section */
.hero-section {
  height: 100vh;
  width: 100%;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-slider {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  background-size: cover;
  background-position: center;
}

.hero-slide.active {
  opacity: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
  max-width: 800px;
  padding: 0 20px;
}

.hero-title {
  font-size: 3rem;
  margin-bottom: 1rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  animation: fadeUp 1s ease-out forwards;
}

.hero-subtitle {
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  opacity: 0.9;
  animation: fadeUp 1s ease-out 0.3s forwards;
  opacity: 0; /* Initial state for animation */
}

/* Collections Grid (Home) */
.collections-preview {
  padding: 6rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
  font-size: 1.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.grid-layout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.collection-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3/4;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.collection-card:hover .card-image {
  transform: scale(1.05);
}

.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.collection-card:hover .card-overlay {
  opacity: 1;
}

.card-title {
  color: #fff;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid #fff;
  padding-bottom: 5px;
}

/* ==========================================================================
   Collections Page
   ========================================================================== */
.page-header {
  padding: 8rem 0 4rem;
  text-align: center;
  background-color: var(--bg-secondary);
}

.page-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.page-desc {
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-secondary);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem; /* Consistent spacing */
  padding-bottom: 4rem;
}

.gallery-item {
  position: relative;
  break-inside: avoid;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeIn 0.8s ease forwards;
}

.gallery-item img {
  width: 100%;
  height: auto; /* Allow natural height for masonry effect */
  display: block;
  transition: filter var(--transition-fast);
}

.gallery-item:hover img {
  filter: brightness(0.95);
}

.item-info {
  padding-top: 1rem;
  text-align: center;
}

.item-name {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.item-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* ==========================================================================
   Details Page
   ========================================================================== */
.product-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  min-height: 80vh;
  padding-top: 6rem;
  align-items: start;
}

/* Left: Main Image & Gallery */
.product-visuals {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.main-image-container {
  width: 100%;
  overflow: hidden;
  cursor: zoom-in;
  background-color: #f0f0f0;
}

.detail-main-img {
  width: 100%;
  height: auto;
  transition: transform 0.3s ease;
  transform-origin: center center;
}

/* Zoom effect handled by JS, but style support here */
.zoomed {
  transform: scale(2);
  cursor: zoom-out;
}

.thumbnail-strip {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.thumbnail {
  width: 80px;
  height: 100px;
  object-fit: cover;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
  border: 1px solid transparent;
}

.thumbnail:hover, .thumbnail.active {
  opacity: 1;
  border-color: var(--text-primary);
}

/* Right: Info */
.product-info {
  position: sticky;
  top: 6rem;
  padding-right: 2rem;
}

.product-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.product-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-family: var(--font-en);
}

.info-block {
  margin-bottom: 2.5rem;
}

.info-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  display: block;
}

.info-text {
  font-size: 0.95rem;
  line-height: 1.6;
}

.pairing-suggestions {
  margin-top: 3rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.pairing-grid {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
}

.pairing-item {
  width: 120px;
  flex-shrink: 0;
  text-align: center;
  cursor: pointer;
}

.pairing-item img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: 4rem 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

.copyright {
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.5rem; }
  .grid-layout { grid-template-columns: repeat(2, 1fr); }
  .product-wrapper { padding-top: 5rem; gap: 2rem; }
}

@media (max-width: 768px) {
  /* Navigation */
  .site-header { padding: 1rem 0; }
  .menu-toggle { display: block; font-size: 1.5rem; }
  
  .main-nav {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: 0;
    background: #fff;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: height 0.3s ease;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-color);
  }
  
  .main-nav.open { height: 200px; }
  
  /* Layouts */
  .hero-title { font-size: 2rem; }
  .grid-layout { grid-template-columns: 1fr; }
  
  .product-wrapper {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .product-info {
    position: static;
    padding-right: 0;
  }
  
  .page-header { padding: 6rem 0 2rem; }
}