/* 
 * File: modern-mens-fashion-020506/frontend/public/styles.css
 * Description: Global styles for Modern Men's Fashion Website
 * Design System: Dark Mode, Minimalist, High Contrast
 */

:root {
  /* Color Palette */
  --bg-primary: #0A0A0A;
  --bg-secondary: #1A1A1A;
  --text-primary: #FFFFFF;
  --text-secondary: #B3B3B3;
  --accent-blue: #2C3E50;
  --accent-brown: #8B7355;
  --border-color: #333333;
  --overlay-black: rgba(0, 0, 0, 0.6);

  /* Typography */
  --font-en: 'Helvetica Now', 'Avenir Next', 'Futura', sans-serif;
  --font-cn: 'PingFang SC', 'Source Han Sans CN', 'Noto Sans SC', sans-serif;
  
  /* Spacing & Layout */
  --nav-height: 80px;
  --container-width: 1440px;
  --gutter: 2rem;
  
  /* Animation */
  --transition-fast: 0.3s ease;
  --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

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

ul {
  list-style: none;
}

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

/* Typography System */
h1, h2, h3, h4 {
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.display-text {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: 2rem;
  text-align: center;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 3rem;
  text-align: center;
}

/* Utility Classes */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.grid-layout {
  display: grid;
  gap: var(--gutter);
}

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

.hidden {
  display: none;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--gutter);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

.nav-item {
  position: relative;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  cursor: pointer;
}

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

.nav-item::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: var(--transition-fast);
  transform: translateX(-50%);
}

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

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

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

.hero-bg img, .hero-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7);
  transform: scale(1.05); /* Subtle zoom base */
  animation: slowZoom 20s infinite alternate;
}

.hero-content {
  text-align: center;
  z-index: 1;
  opacity: 0;
  animation: fadeUp 1s ease forwards 0.5s;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* Three Column Preview (Homepage) */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  height: 80vh;
  width: 100%;
}

.preview-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  group: true;
}

.preview-image {
  width: 100%;
  height: 100%;
  transition: transform 0.6s ease;
}

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

.preview-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 3rem;
  opacity: 0.9;
  transition: opacity 0.3s ease;
}

.preview-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  transform: translateY(20px);
  transition: transform 0.4s ease;
}

.preview-card:hover .preview-title {
  transform: translateY(0);
}

/* Series Page (Masonry) */
.series-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--nav-height);
}

.sidebar-nav {
  width: 250px;
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  padding: 2rem;
  border-right: 1px solid var(--border-color);
  background: var(--bg-primary);
}

.category-link {
  display: block;
  padding: 1rem 0;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: var(--transition-fast);
}

.category-link:hover, .category-link.active {
  color: var(--text-primary);
  padding-left: 10px;
  border-left: 2px solid var(--accent-brown);
}

.masonry-grid {
  flex: 1;
  columns: 3 300px;
  column-gap: 1.5rem;
  padding: 2rem;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.masonry-item img {
  width: 100%;
  display: block;
  border-radius: 2px;
  transition: filter 0.3s ease;
}

.item-info {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 1rem;
  background: rgba(10,10,10,0.8);
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.masonry-item:hover .item-info {
  transform: translateY(0);
}

/* Outfits Page */
.outfit-container {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2rem;
  padding-top: calc(var(--nav-height) + 2rem);
  min-height: 100vh;
}

.selector-panel {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 4px;
}

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

.selector-title {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  color: var(--accent-brown);
}

.option-btn {
  display: block;
  width: 100%;
  padding: 0.8rem;
  text-align: left;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.option-btn:hover, .option-btn.selected {
  border-color: var(--text-primary);
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.display-area {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.outfit-card {
  background: var(--bg-secondary);
  padding: 1rem;
  animation: fadeIn 0.5s ease;
}

/* Materials Page */
.materials-section {
  padding: 6rem 0;
}

.material-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-bottom: 6rem;
  align-items: center;
}

.material-card:nth-child(even) {
  direction: rtl;
}

.material-card:nth-child(even) .material-info {
  direction: ltr;
}

.material-img-wrapper {
  overflow: hidden;
  height: 500px;
}

.material-img-wrapper img {
  height: 100%;
  transition: transform 0.8s ease;
}

.material-card:hover img {
  transform: scale(1.1);
}

.material-info h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.material-info p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.feature-tags {
  display: flex;
  gap: 1rem;
}

.tag {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  text-transform: uppercase;
}

/* Philosophy Page */
.philosophy-hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.philosophy-text-card {
  background: rgba(10, 10, 10, 0.7);
  backdrop-filter: blur(10px);
  padding: 4rem;
  max-width: 800px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.1);
}

.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding: 4rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-color);
}

.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4rem;
  width: 100%;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-content {
  width: 45%;
  padding: 2rem;
  background: var(--bg-secondary);
}

.timeline-date {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-primary);
  padding: 0.5rem;
  color: var(--accent-brown);
  font-weight: bold;
  border: 1px solid var(--border-color);
}

/* Footer */
.site-footer {
  padding: 4rem 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  margin-top: auto;
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
}

/* Loading State */
.skeleton {
  background: linear-gradient(90deg, var(--bg-secondary) 25%, #222 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes slowZoom {
  from { transform: scale(1); }
  to { transform: scale(1.1); }
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Responsive */
@media (max-width: 768px) {
  .preview-grid {
    grid-template-columns: 1fr;
    height: auto;
  }
  
  .preview-card {
    height: 400px;
  }

  .series-layout {
    flex-direction: column;
  }

  .sidebar-nav {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    white-space: nowrap;
    display: flex;
    gap: 1rem;
    padding: 1rem;
  }

  .outfit-container {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item, .timeline-item:nth-child(odd) {
    flex-direction: column;
    align-items: flex-start;
    padding-left: 50px;
  }

  .timeline-content {
    width: 100%;
  }

  .timeline-date {
    left: 20px;
  }
  
  .navbar {
    padding: 0 1rem;
  }
  
  .nav-links {
    display: none; /* Add hamburger menu logic in JS/HTML structure later */
  }
  
  .mobile-menu-btn {
    display: block; /* If implementing JS toggle */
  }
  
  .material-card {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .material-card:nth-child(even) {
    direction: ltr;
  }
}