/* 
 * Fashion Aesthetics - Global Styles 
 * Design System & Responsive Layout
 */

:root {
  /* Color Palette */
  --color-bg: #FAF9F7;
  --color-bg-alt: #E8E5E0;
  --color-accent: #A3B1C6;
  --color-text-main: #333333;
  --color-text-muted: #666666;
  --color-white: #FFFFFF;
  --color-black-overlay: rgba(0, 0, 0, 0.4);
  
  /* Typography */
  --font-sans: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Georgia", "Times New Roman", serif;
  
  /* Spacing */
  --spacing-sm: 20px;
  --spacing-md: 30px;
  --spacing-lg: 60px;
  --spacing-xl: 100px;
  
  /* Transitions */
  --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
  --duration: 0.4s;
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

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

/* Layout Utilities */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  width: 100%;
}

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

.text-center { text-align: center; }
.fade-in { animation: fadeIn 0.8s ease forwards; opacity: 0; }

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: rgba(250, 249, 247, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--spacing-lg);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-item {
  position: relative;
  font-size: 0.9rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.nav-item.active, .nav-item:hover {
  color: var(--color-text-main);
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

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

/* Hero Carousel */
.hero {
  position: relative;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
  z-index: 1;
}

.hero-slide.active { opacity: 1; z-index: 2; }

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.1);
  transition: transform 6s ease; /* Ken Burns effect */
}

.hero-slide.active .hero-img {
  transform: scale(1);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-black-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  z-index: 3;
}

.hero-content {
  color: var(--color-white);
  max-width: 800px;
  padding: var(--spacing-md);
}

.hero-title {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  letter-spacing: 2px;
}

.hero-text {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 1px;
}

/* Grid Layouts */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

/* Card Components */
.card {
  position: relative;
  overflow: hidden;
  group: hover;
}

.card-img-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 2/3;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out);
}

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

.card-content {
  padding-top: var(--spacing-sm);
}

.card-title {
  font-size: 1.1rem;
  margin-bottom: 5px;
  font-family: var(--font-serif);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Detail Page Specifics */
.detail-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--spacing-xl);
  padding-top: 100px; /* Offset for fixed header */
  min-height: 100vh;
}

.detail-gallery {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.detail-info {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.detail-specs {
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--color-bg-alt);
  padding-top: var(--spacing-md);
}

.spec-item {
  margin-bottom: var(--spacing-md);
}

.spec-label {
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  margin-bottom: 5px;
  display: block;
}

/* Buttons & Links */
.btn-link {
  display: inline-block;
  margin-top: var(--spacing-md);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--color-text-main);
  padding-bottom: 2px;
}

.btn-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

/* Footer & Banner */
.banner {
  height: 60vh;
  width: 100%;
  position: relative;
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
}

.banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.page-footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-bg-alt);
  margin-top: var(--spacing-xl);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Dynamic Slots */
#slot-promo, #slot-related {
  margin: var(--spacing-lg) 0;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .detail-layout { gap: var(--spacing-lg); }
  .hero-title { font-size: 3rem; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 var(--spacing-sm); }
  .nav-links { display: none; } /* Mobile menu simplified for pure CSS/JS toggle later */
  
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  
  .detail-layout { grid-template-columns: 1fr; padding-top: 80px; }
  .detail-info { position: static; }
  
  .hero-title { font-size: 2.5rem; }
  .section { padding: var(--spacing-md) 0; }
  
  /* Mobile Hamburger (Basic Visual) */
  .mobile-menu-btn {
    display: block;
    width: 30px;
    height: 20px;
    position: relative;
    cursor: pointer;
  }
  
  .mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-main);
    margin-bottom: 6px;
  }
}