/* 
 * Fashion Gallery - Global Styles
 * Design Philosophy: Minimalist, Artistic, Visual-First
 */

:root {
  /* Color Palette - Neutral Base */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #FAFAFA;
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #999999;
  
  /* Seasonal Accents (Default: Spring) */
  --color-accent-soft: #F5E6E8;
  --color-accent-fresh: #E1F0D8;
  
  /* Layout */
  --spacing-unit: 8px;
  --container-width: 1440px;
  --header-height: 80px;
  
  /* Typography */
  --font-family-main: "Source Han Sans CN", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  
  /* Animation */
  --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.3s ease-out;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-main);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography System */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-light);
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

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

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.section {
  padding: 6rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background-color: var(--color-text-primary);
  margin: 1rem auto 0;
}

/* Navigation */
.navbar {
  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: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  transition: var(--transition-smooth);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  height: 60px;
  background-color: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.brand-logo {
  font-size: 1.5rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 0.5rem 0;
}

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

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

/* Hero Section */
.hero {
  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 1.5s ease-in-out;
  background-size: cover;
  background-position: center;
}

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

.hero-content {
  text-align: center;
  color: #fff;
  z-index: 10;
  padding: 2rem;
  background: rgba(0,0,0,0.1); /* Slight overlay for readability */
  backdrop-filter: blur(2px);
  border-radius: 4px;
}

.hero-title {
  font-size: 4rem;
  font-weight: 200;
  margin-bottom: 1rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.hero-subtitle {
  font-size: 1.2rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.9;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: #fff;
  font-size: 2rem;
  opacity: 0.8;
  cursor: pointer;
}

/* Collections Grid (Index & Collections Page) */
.grid-collections {
  grid-template-columns: repeat(4, 1fr);
}

.collection-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  group: hover;
}

.card-image-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/4;
}

.card-image {
  width: 100%;
  height: 100%;
  transition: var(--transition-smooth);
}

.card-image.hover-img {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}

.collection-card:hover .card-image.main-img {
  opacity: 0;
}

.collection-card:hover .card-image.hover-img {
  opacity: 1;
  transform: scale(1.05);
}

.card-info {
  padding: 1rem 0;
  text-align: center;
}

.card-title {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  font-weight: var(--font-weight-regular);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* Special Feature / Inspiration Section */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  margin-bottom: 6rem;
}

.feature-block.reverse {
  direction: rtl;
}

.feature-block.reverse .feature-content {
  direction: ltr;
}

.feature-image {
  width: 100%;
  height: 600px;
  object-fit: cover;
}

.feature-content {
  padding: 2rem;
}

/* Horizontal Scroll Gallery */
.scroll-gallery {
  display: flex;
  overflow-x: auto;
  gap: 1.5rem;
  padding-bottom: 2rem;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE/Edge */
}

.scroll-gallery::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.gallery-item {
  min-width: 300px;
  flex: 0 0 auto;
}

/* Style Guide / Moodboard */
.moodboard-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(2, 300px);
  gap: 1rem;
}

.mood-item {
  position: relative;
  overflow: hidden;
}

.mood-item:nth-child(1) { grid-column: 1 / 5; grid-row: 1 / 3; }
.mood-item:nth-child(2) { grid-column: 5 / 9; grid-row: 1 / 2; }
.mood-item:nth-child(3) { grid-column: 9 / 13; grid-row: 1 / 2; }
.mood-item:nth-child(4) { grid-column: 5 / 13; grid-row: 2 / 3; }

.mood-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem;
  background: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
  color: #fff;
  opacity: 0;
  transition: var(--transition-fast);
}

.mood-item:hover .mood-overlay {
  opacity: 1;
}

/* Filters */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: none;
  border: none;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
}

.filter-btn.active, .filter-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-primary);
}

/* Footer */
.footer {
  padding: 4rem 0;
  background-color: var(--color-bg-secondary);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 4rem;
}

/* Animations */
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translate(-50%, 0); }
  40% { transform: translate(-50%, -10px); }
  60% { transform: translate(-50%, -5px); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in-up {
  animation: fadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0; /* JS will trigger this */
}

/* Responsive Design */
@media (max-width: 1024px) {
  h1 { font-size: 3rem; }
  .grid-collections { grid-template-columns: repeat(3, 1fr); }
  .moodboard-grid { display: flex; flex-direction: column; height: auto; }
  .mood-item { height: 300px; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 1.5rem; }
  .nav-links { display: none; } /* Mobile menu implementation usually needs JS, keeping simple for now or use :target trick */
  
  /* Simple mobile menu fallback */
  .mobile-menu-btn { display: block; }
  
  .hero-title { font-size: 2.5rem; }
  .grid-collections { grid-template-columns: repeat(2, 1fr); }
  
  .feature-block, .feature-block.reverse {
    grid-template-columns: 1fr;
    gap: 2rem;
    direction: ltr;
  }
  
  .feature-image { height: 400px; }
  
  .container { padding: 0 1.5rem; }
}

@media (max-width: 480px) {
  .grid-collections { grid-template-columns: 1fr; }
  .hero-content { width: 90%; }
}

/* Utilities */
.slot-placeholder {
  min-height: 100px;
  background: repeating-linear-gradient(
    45deg,
    #f0f0f0,
    #f0f0f0 10px,
    #ffffff 10px,
    #ffffff 20px
  );
  border: 1px dashed #ccc;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 0.8rem;
  margin: 1rem 0;
}