/* 
 * Pure Form - Fashion Gallery
 * Style.css
 * 
 * Design System: Minimalist, Modern, High-end
 * Framework: Pico.css (Customized extension)
 */

:root {
  /* Typography */
  --font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Noto Serif SC", "Playfair Display", Georgia, serif;
  
  /* Color Palette - Neutral Aesthetic */
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-light: #595959;
  --color-accent: #8c8c8c;
  --color-border: #f0f0f0;
  --color-overlay: rgba(0, 0, 0, 0.2);
  
  /* Layout Spacing */
  --spacing-section: 8rem;
  --spacing-element: 2rem;
  
  /* Animation Timing */
  --transition-smooth: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-hover: all 0.4s ease-out;
}

/* --- Global Reset & Overrides --- */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

/* Pico.css overrides for cleaner look */
h1, h2, h3, h4, h5, h6 {
  font-weight: 300;
  letter-spacing: 0.02em;
  color: var(--color-text);
  margin-top: 0;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
p { color: var(--color-text-light); line-height: 1.8; }
a { text-decoration: none; color: inherit; transition: var(--transition-hover); }
a:hover { opacity: 0.7; }

/* --- Navigation --- */
nav.main-nav {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  padding: 2.5rem 4rem;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  transition: all 0.4s ease;
  pointer-events: none; /* Let clicks pass through empty spaces */
}

nav.main-nav > * {
  pointer-events: auto; /* Re-enable clicks on content */
}

nav.main-nav.scrolled {
  background: rgba(255, 255, 255, 0.98);
  padding: 1.5rem 4rem;
  box-shadow: 0 1px 0 var(--color-border);
}

.nav-brand {
  font-family: var(--font-family);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
  color: var(--color-text);
}

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

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

/* --- Hero Section (Index) --- */
.hero-section {
  position: relative;
  height: 100vh;
  width: 100vw;
  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;
}

.slide-item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 2s ease-in-out;
  transform: scale(1.05); /* Slight zoom for ken burns effect usually controlled by JS */
}

.slide-item.active {
  opacity: 1;
  transform: scale(1);
  transition: opacity 2s ease-in-out, transform 8s ease-out;
}

.slide-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
}

.hero-content {
  text-align: center;
  color: #fff;
  z-index: 10;
  max-width: 900px;
  padding: 0 2rem;
  mix-blend-mode: difference;
}

.display-title {
  font-family: var(--font-serif);
  font-size: 4rem;
  margin-bottom: 1rem;
  font-weight: 300;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 0.9rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.9;
}

.scroll-indicator {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  animation: float 2s infinite ease-in-out;
  color: #fff;
  mix-blend-mode: difference;
  font-size: 2rem;
  opacity: 0.7;
}

@keyframes float {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.5; }
  50% { transform: translate(-50%, 10px); opacity: 1; }
}

/* --- Sections General --- */
.section-padding {
  padding: var(--spacing-section) 0;
}

.container-custom {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 5%;
}

.text-center { text-align: center; }
.fade-up { opacity: 0; transform: translateY(30px); transition: var(--transition-smooth); }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* --- Collections Page --- */
.page-header {
  padding-top: 12rem;
  padding-bottom: 6rem;
  text-align: center;
}

.collection-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 4rem;
}

.collection-nav a {
  font-size: 0.9rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.collection-nav a.active {
  color: var(--color-text);
  border-bottom: 1px solid var(--color-text);
}

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

.grid-item {
  position: relative;
  overflow: hidden;
  cursor: zoom-in;
}

.grid-item.tall { grid-row: span 2; }
.grid-item.wide { grid-column: span 2; }

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.8s ease;
}

.grid-item:hover img {
  transform: scale(1.03);
}

.item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2rem;
  background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition-hover);
  color: #fff;
}

.grid-item:hover .item-overlay {
  opacity: 1;
  transform: translateY(0);
}

.item-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  display: block;
}

.item-desc {
  font-size: 0.8rem;
  opacity: 0.9;
  font-weight: 300;
}

/* --- Philosophy Page --- */
.zigzag-section {
  display: flex;
  align-items: center;
  margin-bottom: 0;
  min-height: 80vh;
}

.zigzag-section:nth-child(even) {
  flex-direction: row-reverse;
}

.zigzag-visual {
  flex: 1;
  height: 80vh;
  position: relative;
}

.zigzag-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.zigzag-content {
  flex: 1;
  padding: 4rem 8rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.philosophy-quote {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  line-height: 1.4;
  margin-bottom: 2rem;
  color: var(--color-text);
}

/* --- Lightbox --- */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.98);
  z-index: 2000;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox.active {
  display: flex;
  opacity: 1;
}

.lightbox img {
  max-height: 90vh;
  max-width: 90vw;
  box-shadow: 0 20px 50px rgba(0,0,0,0.05);
}

.lightbox-close {
  position: absolute;
  top: 2rem;
  right: 3rem;
  font-size: 3rem;
  font-weight: 100;
  cursor: pointer;
  line-height: 1;
}

/* --- Footer --- */
.site-footer {
  padding: 3rem 0;
  text-align: right;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-accent);
}

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

/* --- Responsive Design --- */
@media (max-width: 1024px) {
  .display-title { font-size: 3rem; }
  .zigzag-content { padding: 3rem; }
  .masonry-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  nav.main-nav { padding: 1.5rem 2rem; }
  .nav-links { gap: 1.5rem; }
  .display-title { font-size: 2.5rem; }
  
  .zigzag-section, .zigzag-section:nth-child(even) {
    flex-direction: column;
    height: auto;
  }
  .zigzag-visual { height: 60vh; width: 100%; }
  .zigzag-content { padding: 4rem 2rem; }
  
  .masonry-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .grid-item.wide { grid-column: span 1; }
  
  .site-footer { text-align: center; }
  .footer-content { justify-content: center; }
}