/* =============================================
   KIMYOUNGYI - Luxury Brand Design System
   ============================================= */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400&family=Montserrat:wght@300;400;500;600;700&display=swap');

/* =============================================
   CSS Variables / Design Tokens
   ============================================= */
:root {
  /* Colors */
  --color-black: #0a0a0a;
  --color-charcoal: #1a1a1a;
  --color-dark-gray: #2a2a2a;
  --color-gray: #888888;
  --color-light-gray: #c4c4c4;
  --color-ivory: #f8f5f0;
  --color-cream: #faf9f7;
  --color-white: #ffffff;
  --color-gold: #c9a962;
  --color-gold-light: #d4bc7a;
  --color-gold-dark: #b8943f;
  
  /* Typography */
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.5rem;
  --text-hero: clamp(3rem, 8vw, 7rem);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-slower: 0.8s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.25);
  
  /* Layout */
  --max-width: 1400px;
  --nav-height: 80px;
}

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

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

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-black);
  background-color: var(--color-cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* =============================================
   Typography
   ============================================= */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.text-serif {
  font-family: var(--font-serif);
}

.text-sans {
  font-family: var(--font-sans);
}

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.text-gold {
  color: var(--color-gold);
}

.text-center {
  text-align: center;
}

/* =============================================
   Layout Components
   ============================================= */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-5xl) 0;
}

.section--dark {
  background-color: var(--color-black);
  color: var(--color-cream);
}

.section--charcoal {
  background-color: var(--color-charcoal);
  color: var(--color-cream);
}

/* =============================================
   Navigation
   ============================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition-base);
}

.nav--scrolled {
  background-color: rgba(250, 249, 247, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.nav--dark {
  background-color: transparent;
}

.nav--dark.nav--scrolled {
  background-color: rgba(10, 10, 10, 0.95);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--space-2xl);
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-black);
  transition: var(--transition-base);
}

.nav--dark .nav__logo {
  color: var(--color-cream);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav__link {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-black);
  position: relative;
  padding: var(--space-sm) 0;
}

.nav--dark .nav__link {
  color: var(--color-cream);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-gold);
  transition: var(--transition-base);
}

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

.nav__link:hover {
  color: var(--color-gold);
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-black);
  transition: var(--transition-base);
}

.nav--dark .nav__toggle span {
  background-color: var(--color-cream);
}

/* =============================================
   Hero Section
   ============================================= */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-black);
  overflow: hidden;
}

.hero__background {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-charcoal) 50%, var(--color-dark-gray) 100%);
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 0%, rgba(0, 0, 0, 0.4) 100%);
}

.hero__content {
  position: relative;
  z-index: 10;
  text-align: center;
  color: var(--color-cream);
  padding: var(--space-xl);
}

.hero__subtitle {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--color-gold);
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp 1s ease forwards;
  animation-delay: 0.3s;
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fadeInUp 1s ease forwards;
  animation-delay: 0.5s;
}

.hero__tagline {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 300;
  font-style: italic;
  color: var(--color-light-gray);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  opacity: 0;
  animation: fadeInUp 1s ease forwards;
  animation-delay: 0.7s;
}

.hero__cta {
  opacity: 0;
  animation: fadeInUp 1s ease forwards;
  animation-delay: 0.9s;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-light-gray);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  opacity: 0;
  animation: fadeIn 1s ease forwards;
  animation-delay: 1.2s;
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-gold), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

/* Gold Accent Lines */
.hero__accent {
  position: absolute;
  background-color: var(--color-gold);
  opacity: 0.3;
}

.hero__accent--left {
  left: 10%;
  top: 20%;
  width: 1px;
  height: 200px;
  animation: fadeIn 1.5s ease forwards;
  animation-delay: 1s;
}

.hero__accent--right {
  right: 10%;
  bottom: 20%;
  width: 1px;
  height: 200px;
  animation: fadeIn 1.5s ease forwards;
  animation-delay: 1.2s;
}

/* =============================================
   Buttons
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  padding: var(--space-lg) var(--space-2xl);
  border: 1px solid transparent;
  transition: var(--transition-base);
}

.btn--primary {
  background-color: var(--color-gold);
  color: var(--color-black);
  border-color: var(--color-gold);
}

.btn--primary:hover {
  background-color: var(--color-gold-dark);
  border-color: var(--color-gold-dark);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-cream);
  border-color: var(--color-cream);
}

.btn--outline:hover {
  background-color: var(--color-cream);
  color: var(--color-black);
}

.btn--outline-dark {
  background-color: transparent;
  color: var(--color-black);
  border-color: var(--color-black);
}

.btn--outline-dark:hover {
  background-color: var(--color-black);
  color: var(--color-cream);
}

.btn--gold-outline {
  background-color: transparent;
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.btn--gold-outline:hover {
  background-color: var(--color-gold);
  color: var(--color-black);
}

/* =============================================
   About Section
   ============================================= */
.about {
  background-color: var(--color-cream);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about__image {
  position: relative;
  aspect-ratio: 4/5;
  overflow: hidden;
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slower);
}

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

.about__image::after {
  content: '';
  position: absolute;
  inset: var(--space-lg);
  border: 1px solid var(--color-gold);
  pointer-events: none;
}

.about__content {
  padding: var(--space-2xl);
}

.about__label {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  margin-bottom: var(--space-lg);
}

.about__title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-xl);
}

.about__text {
  font-size: var(--text-base);
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.about__signature {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-style: italic;
  color: var(--color-gold);
}

/* =============================================
   Featured Products Section
   ============================================= */
.featured {
  background-color: var(--color-black);
  color: var(--color-cream);
}

.featured__header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.featured__label {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--color-gold);
  margin-bottom: var(--space-md);
}

.featured__title {
  font-size: var(--text-4xl);
}

.featured__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.featured__more {
  text-align: center;
  margin-top: var(--space-4xl);
}

/* =============================================
   Product Card
   ============================================= */
.product-card {
  position: relative;
  background-color: var(--color-charcoal);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-base);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.product-card__image {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
  background-color: var(--color-dark-gray);
}

.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slower);
}

.product-card:hover .product-card__image img {
  transform: scale(1.08);
}

.product-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 60%);
  opacity: 0;
  transition: var(--transition-base);
}

.product-card:hover .product-card__overlay {
  opacity: 1;
}

.product-card__content {
  padding: var(--space-lg);
}

.product-card__category {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  margin-bottom: var(--space-sm);
}

.product-card__name {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-cream);
  margin-bottom: var(--space-sm);
}

.product-card__collection {
  font-size: var(--text-sm);
  color: var(--color-gray);
}

.product-card__quick-view {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  transition: var(--transition-base);
}

.product-card:hover .product-card__quick-view {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Placeholder Image Style */
.product-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-charcoal) 0%, var(--color-dark-gray) 100%);
  color: var(--color-gray);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.product-card__placeholder-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.product-card__placeholder-icon svg {
  width: 48px;
  height: 48px;
  stroke: var(--color-gold);
  opacity: 0.5;
}

/* =============================================
   Archive Page
   ============================================= */
.archive-hero {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  background-color: var(--color-black);
  color: var(--color-cream);
  text-align: center;
}

.archive-hero__title {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-lg);
}

.archive-hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Filter */
.archive-filter {
  background-color: var(--color-charcoal);
  padding: var(--space-xl) 0;
  position: sticky;
  top: var(--nav-height);
  z-index: 100;
}

.archive-filter__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
}

.archive-filter__btn {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-light-gray);
  padding: var(--space-sm) var(--space-lg);
  border-bottom: 2px solid transparent;
  transition: var(--transition-base);
}

.archive-filter__btn:hover,
.archive-filter__btn--active {
  color: var(--color-cream);
  border-bottom-color: var(--color-gold);
}

/* Archive Grid */
.archive-grid {
  background-color: var(--color-black);
  padding: var(--space-4xl) 0;
}

.archive-grid__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.archive-grid__empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-4xl);
  color: var(--color-gray);
}

.archive-grid__empty-icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.archive-grid__empty-text {
  font-size: var(--text-lg);
}

/* =============================================
   Product Detail Page
   ============================================= */
.product-detail {
  padding-top: var(--nav-height);
  min-height: 100vh;
  background-color: var(--color-black);
  color: var(--color-cream);
}

.product-detail__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - var(--nav-height));
}

.product-detail__gallery {
  position: relative;
  background-color: var(--color-charcoal);
}

.product-detail__main-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-detail__thumbnails {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-sm);
}

.product-detail__thumb {
  width: 60px;
  height: 60px;
  border: 2px solid transparent;
  cursor: pointer;
  opacity: 0.6;
  transition: var(--transition-base);
}

.product-detail__thumb:hover,
.product-detail__thumb--active {
  opacity: 1;
  border-color: var(--color-gold);
}

.product-detail__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-detail__info {
  padding: var(--space-4xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-detail__category {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  margin-bottom: var(--space-lg);
}

.product-detail__name {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-xl);
}

.product-detail__collection {
  font-size: var(--text-sm);
  color: var(--color-gray);
  margin-bottom: var(--space-2xl);
}

.product-detail__description {
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-light-gray);
  margin-bottom: var(--space-2xl);
}

.product-detail__back {
  margin-top: auto;
}

/* =============================================
   Footer
   ============================================= */
.footer {
  background-color: var(--color-black);
  color: var(--color-cream);
  padding: var(--space-4xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-dark-gray);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-4xl);
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-gray);
  line-height: 1.8;
}

.footer__title {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-xl);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-gray);
}

.footer__link:hover {
  color: var(--color-gold);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-dark-gray);
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-gray);
}

.footer__social {
  display: flex;
  gap: var(--space-lg);
}

.footer__social-link {
  color: var(--color-gray);
  transition: var(--transition-base);
}

.footer__social-link:hover {
  color: var(--color-gold);
}

/* =============================================
   Animations
   ============================================= */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollLine {
  0%, 100% {
    transform: scaleY(1);
    transform-origin: top;
  }
  50% {
    transform: scaleY(0.5);
    transform-origin: top;
  }
}

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   Responsive Design
   ============================================= */
@media (max-width: 1200px) {
  .featured__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .archive-grid__inner {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  
  .product-detail__grid {
    grid-template-columns: 1fr;
  }
  
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 70px;
  }
  
  .nav__menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-cream);
    flex-direction: column;
    padding: var(--space-xl);
    gap: var(--space-lg);
    box-shadow: var(--shadow-md);
  }
  
  .nav--dark .nav__menu {
    background-color: var(--color-black);
  }
  
  .nav__menu--open {
    display: flex;
  }
  
  .nav__toggle {
    display: flex;
  }
  
  .featured__grid,
  .archive-grid__inner {
    grid-template-columns: 1fr;
  }
  
  .footer__grid {
    grid-template-columns: 1fr;
  }
  
  .footer__bottom {
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
  }
  
  .archive-filter__inner {
    flex-wrap: wrap;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .section {
    padding: var(--space-3xl) 0;
  }
  
  .hero__title {
    font-size: var(--text-4xl);
  }
  
  .btn {
    padding: var(--space-md) var(--space-xl);
  }
}

/* =============================================
   Utility Classes
   ============================================= */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.no-scroll {
  overflow: hidden;
}