/* ============================================
   FDONGRUI — Luxury Handbag Brand
   Design System & Styles
   ============================================ */

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

:root {
  /* Colors */
  --black: #1a1a1a;
  --white: #ffffff;
  --cream: #f7f3ee;
  --beige: #ede5dc;
  --beige-dark: #d4c8b8;
  --brown-dark: #3d2b1f;
  --brown: #5c4033;
  --gray: #8c8c8c;
  --gray-light: #e8e8e8;
  --gray-medium: #b3b3b3;
  --gold: #b8a07e;
  --gold-light: #c9b590;
  --gold-dark: #9a8260;
  
  /* Typography */
  --font-serif: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
  --font-sans: 'Jost', 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;
  
  /* Layout */
  --header-height: 80px;
  --max-width: 1400px;
  --border: 1px solid var(--gray-light);
}

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

body {
  font-family: var(--font-sans);
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
  font-weight: 300;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.3;
}

a { color: inherit; text-decoration: none; transition: color 0.3s ease; }
img { display: block; max-width: 100%; height: auto; }

/* --- Utility --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }
.container-narrow { max-width: 900px; margin: 0 auto; padding: 0 var(--space-md); }
.text-center { text-align: center; }
.serif { font-family: var(--font-serif); }
.italic { font-style: italic; }
.gold-text { color: var(--gold); }
.uppercase { text-transform: uppercase; }
.tracking-wide { letter-spacing: 0.15em; }
.tracking-wider { letter-spacing: 0.25em; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 1rem 2.5rem; font-family: var(--font-sans); font-size: 0.8rem;
  font-weight: 400; text-transform: uppercase; letter-spacing: 0.2em;
  cursor: pointer; border: none; transition: all 0.4s cubic-bezier(0.25,0.46,0.45,0.94);
  position: relative; overflow: hidden;
}
.btn-primary { background: var(--black); color: var(--white); border: 1px solid var(--black); }
.btn-primary:hover { background: transparent; color: var(--black); }
.btn-outline { background: transparent; color: var(--black); border: 1px solid var(--black); }
.btn-outline:hover { background: var(--black); color: var(--white); }
.btn-gold { background: var(--gold); color: var(--white); border: 1px solid var(--gold); }
.btn-gold:hover { background: var(--gold-dark); border-color: var(--gold-dark); }
.btn-light { background: transparent; color: var(--white); border: 1px solid var(--white); }
.btn-light:hover { background: var(--white); color: var(--black); }
.btn::after {
  content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.6s ease;
}
.btn:hover::after { left: 100%; }

/* --- Header --- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-height); background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all 0.4s ease;
}
.site-header.scrolled { border-bottom-color: var(--gray-light); box-shadow: 0 2px 20px rgba(0,0,0,0.04); }
.header-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md);
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; }
.logo-mark {
  font-family: var(--font-serif); font-size: 1.8rem; font-weight: 500;
  letter-spacing: 0.15em; color: var(--black);
}
.logo-sub {
  font-family: var(--font-sans); font-size: 0.55rem; letter-spacing: 0.35em;
  text-transform: uppercase; color: var(--gold); margin-top: 2px;
}

/* Nav */
.main-nav { display: flex; align-items: center; gap: 2.5rem; }
.nav-link {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--black); position: relative; padding: 0.25rem 0;
}
.nav-link::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 1px;
  background: var(--gold); transition: width 0.4s ease;
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link.active { color: var(--gold); }

/* Lang toggle */
.lang-switch { display: flex; align-items: center; gap: 0.5rem; }
.lang-option {
  font-size: 0.75rem; letter-spacing: 0.1em; cursor: pointer; color: var(--gray);
  padding: 0.25rem 0.4rem; transition: all 0.3s ease; background: none; border: none;
  font-family: var(--font-sans);
}
.lang-option.active { color: var(--black); font-weight: 500; }
.lang-sep { color: var(--gray-light); }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  padding: 0.5rem; background: none; border: none;
}
.hamburger span {
  width: 24px; height: 1.5px; background: var(--black); transition: all 0.3s ease;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile menu */
.mobile-menu {
  position: fixed; top: var(--header-height); left: 0; right: 0;
  background: var(--white); z-index: 999; padding: 2rem;
  display: flex; flex-direction: column; gap: 1.5rem;
  transform: translateY(-100%); opacity: 0; pointer-events: none;
  transition: all 0.4s ease; border-bottom: 1px solid var(--gray-light);
}
.mobile-menu.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.mobile-menu .nav-link { font-size: 1.2rem; }
.mobile-menu .lang-switch { margin-top: 1rem; }

/* --- Hero --- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; text-align: center; overflow: hidden;
  background: var(--cream);
}
.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background-size: cover; background-position: center;
  opacity: 0.4;
}
.hero-overlay {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(180deg, rgba(247,243,238,0.3) 0%, rgba(247,243,238,0.6) 50%, rgba(247,243,238,0.85) 100%);
}
.hero-content { position: relative; z-index: 2; padding: var(--header-height) var(--space-md) var(--space-xl); max-width: 800px; }
.hero-brand {
  font-family: var(--font-serif); font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 500; letter-spacing: 0.3em; color: var(--black);
  margin-bottom: var(--space-sm); animation: fadeInUp 1.2s ease;
}
.hero-tagline {
  font-family: var(--font-serif); font-size: clamp(1.3rem, 3vw, 2rem);
  font-style: italic; color: var(--brown); margin-bottom: var(--space-sm);
  animation: fadeInUp 1.2s ease 0.2s backwards;
}
.hero-subtitle {
  font-size: 0.9rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--gray); margin-bottom: var(--space-lg);
  animation: fadeInUp 1.2s ease 0.4s backwards;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; animation: fadeInUp 1.2s ease 0.6s backwards; }
.hero-scroll {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--gray); animation: bounce 2s infinite;
}
.hero-scroll::after { content: ''; display: block; width: 1px; height: 30px; background: var(--gray); margin: 0.5rem auto 0; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(10px); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* --- Sections --- */
.section { padding: var(--space-2xl) 0; }
.section-beige { background: var(--cream); }
.section-dark { background: var(--brown-dark); color: var(--white); }
.section-gray { background: #f5f5f5; }

.section-title {
  font-size: clamp(2rem, 5vw, 3.5rem); text-align: center;
  margin-bottom: var(--space-sm); position: relative;
}
.section-subtitle {
  font-size: 0.85rem; letter-spacing: 0.25em; text-transform: uppercase;
  color: var(--gold); text-align: center; margin-bottom: var(--space-md);
}
.section-intro {
  text-align: center; max-width: 600px; margin: 0 auto var(--space-lg);
  font-size: 1rem; color: var(--gray); line-height: 1.8;
}
.section-dark .section-subtitle { color: var(--gold-light); }
.section-dark .section-intro { color: var(--gray-medium); }

/* Divider */
.divider {
  width: 60px; height: 1px; background: var(--gold); margin: var(--space-sm) auto;
}
.divider-wide { width: 100px; }

/* --- Product Grid --- */
.product-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md);
  margin-top: var(--space-lg);
}
.product-grid-4 { grid-template-columns: repeat(4, 1fr); }
.product-grid-2 { grid-template-columns: repeat(2, 1fr); }

.product-card {
  cursor: pointer; transition: transform 0.4s ease; position: relative;
}
.product-card:hover { transform: translateY(-4px); }
.product-image-wrap {
  position: relative; overflow: hidden; background: var(--cream);
  aspect-ratio: 1 / 1; margin-bottom: var(--space-sm);
}
.product-image-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.25,0.46,0.45,0.94);
}
.product-card:hover .product-image-wrap img { transform: scale(1.05); }
.product-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.92); padding: 0.8rem; text-align: center;
  transform: translateY(100%); transition: transform 0.4s ease;
}
.product-card:hover .product-overlay { transform: translateY(0); }
.product-overlay-btn {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.2em;
  color: var(--black); font-weight: 500;
}
.product-name {
  font-family: var(--font-serif); font-size: 1.1rem; font-weight: 500;
  margin-bottom: 0.25rem; color: var(--black);
}
.product-name-zh { font-size: 0.85rem; color: var(--gray); margin-bottom: 0.4rem; }
.product-price { font-size: 0.85rem; color: var(--gold); letter-spacing: 0.1em; font-weight: 500; }
.product-category-tag {
  position: absolute; top: 0.8rem; left: 0.8rem; z-index: 2;
  font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.15em;
  background: rgba(255,255,255,0.9); padding: 0.3rem 0.7rem; color: var(--black);
}

/* --- Filter Bar --- */
.filter-bar {
  display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap;
  margin-bottom: var(--space-lg);
}
.filter-btn {
  padding: 0.6rem 1.5rem; font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.15em; background: transparent; border: 1px solid var(--gray-light);
  color: var(--gray); cursor: pointer; transition: all 0.3s ease;
  font-family: var(--font-sans); font-weight: 400;
}
.filter-btn:hover { border-color: var(--black); color: var(--black); }
.filter-btn.active { background: var(--black); color: var(--white); border-color: var(--black); }

.products-count-bar {
  text-align: center; font-size: 0.8rem; color: var(--gray);
  margin-bottom: var(--space-md); letter-spacing: 0.1em;
}

/* --- Brand Philosophy --- */
.philosophy-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.philosophy-item { text-align: center; }
.philosophy-item-icon {
  width: 60px; height: 60px; margin: 0 auto var(--space-sm);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--gold); border-radius: 50%; font-family: var(--font-serif);
  font-size: 1.5rem; color: var(--gold);
}
.philosophy-item-title {
  font-family: var(--font-serif); font-size: 1.3rem; margin-bottom: var(--space-xs);
}
.philosophy-item-text { font-size: 0.9rem; color: var(--gray); line-height: 1.7; }

/* --- Quality & Design split --- */
.quality-split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0; min-height: 500px;
}
.quality-image {
  background-size: cover; background-position: center; min-height: 400px;
}
.quality-content { padding: var(--space-lg); display: flex; flex-direction: column; justify-content: center; }
.quality-content p { margin-bottom: var(--space-sm); font-size: 1rem; color: var(--gray); }

/* --- CTA Section --- */
.cta-section {
  text-align: center; padding: var(--space-xl) var(--space-md);
  background: var(--brown-dark); color: var(--white);
}
.cta-section h2 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: var(--space-sm); }
.cta-section p { color: var(--gray-medium); margin-bottom: var(--space-md); max-width: 500px; margin-left: auto; margin-right: auto; }

/* --- Product Detail --- */
.product-detail { padding-top: calc(var(--header-height) + 2rem); }
.product-detail-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg);
  max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md);
}
.product-detail-image {
  background: var(--cream); aspect-ratio: 1 / 1; overflow: hidden; position: relative;
}
.product-detail-image img { width: 100%; height: 100%; object-fit: cover; }
.product-detail-info { display: flex; flex-direction: column; gap: var(--space-sm); }
.product-detail-name { font-family: var(--font-serif); font-size: 2rem; margin-bottom: 0.25rem; }
.product-detail-name-zh { font-size: 1.1rem; color: var(--gray); margin-bottom: var(--space-sm); }
.product-detail-price { font-size: 1.3rem; color: var(--gold); font-weight: 500; margin-bottom: var(--space-sm); }
.product-detail-code { font-size: 0.75rem; letter-spacing: 0.15em; color: var(--gray); text-transform: uppercase; }
.product-detail-desc { font-size: 0.95rem; color: var(--gray); line-height: 1.8; margin-bottom: var(--space-sm); }
.detail-row { display: flex; gap: var(--space-sm); padding: 0.8rem 0; border-bottom: 1px solid var(--gray-light); }
.detail-label {
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--black); font-weight: 500; min-width: 100px; flex-shrink: 0;
}
.detail-value { font-size: 0.9rem; color: var(--gray); line-height: 1.7; }
.feature-list { list-style: none; }
.feature-list li { padding: 0.25rem 0; font-size: 0.9rem; color: var(--gray); }
.feature-list li::before { content: '— '; color: var(--gold); }

/* --- About Us --- */
.about-hero {
  padding-top: calc(var(--header-height) + 4rem); text-align: center;
  background: var(--cream); padding-bottom: var(--space-xl);
}
.about-content { max-width: 800px; margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.about-content p { margin-bottom: var(--space-md); font-size: 1rem; color: var(--gray); line-height: 1.9; }
.about-mvv { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin-top: var(--space-xl); }
.about-mvv-item { text-align: center; }
.about-mvv-item h3 { font-size: 1.5rem; margin-bottom: var(--space-sm); color: var(--gold); }
.about-mvv-item p { font-size: 0.9rem; color: var(--gray); }

/* --- Contact --- */
.contact-hero {
  padding-top: calc(var(--header-height) + 4rem); text-align: center;
  background: var(--cream); padding-bottom: var(--space-lg);
}
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg);
  max-width: var(--max-width); margin: 0 auto; padding: var(--space-xl) var(--space-md);
}
.contact-info { display: flex; flex-direction: column; gap: var(--space-md); }
.contact-info-item h4 {
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--gold); margin-bottom: var(--space-xs);
}
.contact-info-item p { font-size: 0.95rem; color: var(--gray); line-height: 1.7; }
.contact-info-item a { color: var(--gray); }
.contact-info-item a:hover { color: var(--black); }

/* Contact form */
.contact-form { display: flex; flex-direction: column; gap: var(--space-sm); }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--black); }
.form-input, .form-textarea {
  padding: 0.8rem 1rem; border: 1px solid var(--gray-light); background: var(--white);
  font-family: var(--font-sans); font-size: 0.9rem; color: var(--black);
  transition: border-color 0.3s ease; outline: none;
}
.form-input:focus, .form-textarea:focus { border-color: var(--gold); }
.form-textarea { min-height: 120px; resize: vertical; }
.form-success-msg {
  padding: 1rem; background: var(--cream); border: 1px solid var(--gold);
  text-align: center; font-size: 0.9rem; color: var(--brown); display: none;
}
.form-success-msg.show { display: block; animation: fadeIn 0.5s ease; }

/* --- Footer --- */
.site-footer { background: var(--black); color: var(--gray-medium); padding: var(--space-xl) 0 var(--space-md); }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 2fr; gap: var(--space-lg);
  max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md);
}
.footer-brand .logo-mark { color: var(--white); }
.footer-brand p { font-size: 0.85rem; line-height: 1.7; margin-top: var(--space-sm); max-width: 350px; }
.footer-links { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-links a { font-size: 0.85rem; color: var(--gray-medium); transition: color 0.3s ease; }
.footer-links a:hover { color: var(--white); }
.footer-contact h4, .footer-links-title {
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--white); margin-bottom: var(--space-sm);
}
.footer-contact p { font-size: 0.85rem; line-height: 1.7; margin-bottom: 0.3rem; }
.footer-contact a { color: var(--gray-medium); }
.footer-contact a:hover { color: var(--white); }
.footer-bottom {
  max-width: var(--max-width); margin: var(--space-lg) auto 0; padding: var(--space-md);
  border-top: 1px solid #333; display: flex; justify-content: space-between;
  align-items: center; flex-wrap: wrap; gap: var(--space-sm);
}
.footer-bottom p { font-size: 0.75rem; color: #666; }
.footer-bottom-links { display: flex; gap: var(--space-md); }
.footer-bottom-links a { font-size: 0.75rem; color: #666; }
.footer-bottom-links a:hover { color: var(--white); }

/* --- Lazy load animation --- */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex; gap: 0.5rem; align-items: center;
  font-size: 0.75rem; color: var(--gray); letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: var(--space-md);
}
.breadcrumb a:hover { color: var(--black); }
.breadcrumb-sep { color: var(--gray-light); }

/* --- Related products --- */
.related-products { padding: var(--space-xl) 0; background: var(--cream); }
.related-products h3 { text-align: center; font-size: 1.8rem; margin-bottom: var(--space-lg); }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .philosophy-grid { grid-template-columns: repeat(2, 1fr); }
  .quality-split { grid-template-columns: 1fr; }
  .quality-image { min-height: 300px; }
  .about-mvv { grid-template-columns: 1fr; gap: var(--space-md); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  :root { --space-xl: 4rem; --space-2xl: 5rem; --header-height: 70px; }
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .lang-switch { display: none; }
  .product-grid, .product-grid-4, .product-grid-2 { grid-template-columns: 1fr; }
  .philosophy-grid { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-brand { letter-spacing: 0.2em; }
  .section { padding: var(--space-xl) 0; }
}

@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: center; }
  .btn { padding: 0.8rem 2rem; font-size: 0.7rem; }
}

/* --- Print --- */
@media print {
  .site-header, .site-footer, .hamburger, .mobile-menu { display: none; }
}