/* ============================================
   NINONG WREN — Design System
   ============================================ */

:root {
  /* Colors */
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-300: #D4D4D4;
  --color-gray-400: #A3A3A3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  /* Typography */
  --font-serif: 'Cormorant Garamond', 'Georgia', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* 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;

  /* Layout */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Navbar */
  --navbar-height: 72px;
}

/* ============================================
   Reset & Base
   ============================================ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-black);
  background-color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

::selection {
  background-color: var(--color-black);
  color: var(--color-white);
}

/* ============================================
   Container
   ============================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ============================================
   Typography — Shared
   ============================================ */

.section-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-md);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-black);
}

/* ============================================
   Navbar
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  z-index: 1000;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-gray-200);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: opacity var(--transition-fast);
}

.brand:hover {
  opacity: 0.7;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: contain;
}

.brand-text {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-black);
}

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

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-black);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-black);
}

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

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-black);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.menu-toggle.active .hamburger-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active .hamburger-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================
   Hero
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5xl) 0 var(--space-4xl);
  background-color: var(--color-white);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.06;
}

.hero-inner {
  text-align: center;
  max-width: 800px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, var(--color-gray-300));
  opacity: 0;
  animation: hero-line-in 1s var(--transition-slow) forwards;
}

.hero-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fade-up 0.8s var(--transition-fast) forwards;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6.5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--color-black);
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fade-up 0.8s 0.15s forwards;
}

.hero-title-accent {
  font-style: italic;
  font-weight: 500;
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-gray-600);
  max-width: 540px;
  margin: 0 auto var(--space-2xl);
  opacity: 0;
  animation: fade-up 0.8s 0.3s forwards;
}

/* CTA Button */
.cta-button {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 1rem 2.5rem;
  background-color: var(--color-black);
  color: var(--color-white);
  border: 1.5px solid var(--color-black);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base);
  opacity: 0;
  animation: fade-up 0.8s 0.45s forwards;
}

.cta-button:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

.cta-button--outline {
  background-color: transparent;
  color: var(--color-black);
}

.cta-button--outline:hover {
  background-color: var(--color-black);
  color: var(--color-white);
}

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  display: block;
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-gray-400), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

/* ============================================
   Products
   ============================================ */

.products {
  padding: var(--space-5xl) 0;
  background-color: var(--color-gray-50);
}

.products .section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

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

.product-card {
  background-color: var(--color-white);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.06);
}

.product-image {
  aspect-ratio: 4 / 3;
  background-color: var(--color-gray-100);
  overflow: hidden;
}

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

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

.product-body {
  padding: var(--space-xl);
}

.product-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-sm);
}

.product-name {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.product-desc {
  font-size: 0.9375rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-gray-600);
  margin-bottom: var(--space-lg);
}

.product-cta {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-black);
  position: relative;
  display: inline-block;
}

.product-cta::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-black);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.product-cta:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ============================================
   About
   ============================================ */

.about {
  padding: var(--space-5xl) 0;
  background-color: var(--color-white);
}

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

.about-visual-inner {
  aspect-ratio: 1 / 1;
  background-color: var(--color-gray-100);
  overflow: hidden;
}

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

.about-content .section-title {
  margin-bottom: var(--space-xl);
}

.about-text {
  font-size: 1.0625rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--color-gray-600);
  margin-bottom: var(--space-lg);
}

.about-values {
  margin-top: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.about-values li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.value-marker {
  color: var(--color-gray-400);
  font-size: 0.625rem;
  margin-top: 5px;
  flex-shrink: 0;
}

.about-values strong {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: 2px;
}

.about-values p {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ============================================
   Contact
   ============================================ */

.contact {
  padding: var(--space-5xl) 0;
  background-color: var(--color-black);
  color: var(--color-white);
}

.contact-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact .section-eyebrow {
  color: var(--color-gray-500);
}

.contact .section-title {
  color: var(--color-white);
  margin-bottom: var(--space-xl);
}

.contact-text {
  font-size: 1.0625rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-gray-400);
  margin-bottom: var(--space-2xl);
}

.contact-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.contact .cta-button {
  border-color: var(--color-white);
  opacity: 1;
  animation: none;
}

.contact .cta-button:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

.contact .cta-button--outline {
  background-color: transparent;
  color: var(--color-white);
}

.contact .cta-button--outline:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo-img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: contain;
}

.footer-tagline {
  font-size: 0.8125rem;
  font-weight: 300;
  margin-top: var(--space-xs);
  color: var(--color-gray-500);
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-links a {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--color-gray-500);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding-top: var(--space-xl);
}

.footer-bottom p {
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--color-gray-600);
}

/* ============================================
   Animations
   ============================================ */

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-line-in {
  from {
    opacity: 0;
    height: 0;
  }
  to {
    opacity: 1;
    height: 60px;
  }
}

@keyframes scroll-pulse {
  0%, 100% {
    opacity: 0.4;
    transform: scaleY(1);
  }
  50% {
    opacity: 1;
    transform: scaleY(1.2);
  }
}

/* Scroll-triggered fade-in */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================
   Mobile Responsive
   ============================================ */

@media (max-width: 1024px) {
  .about-layout {
    gap: var(--space-3xl);
  }
}

@media (max-width: 768px) {
  :root {
    --navbar-height: 64px;
    --container-padding: 1.25rem;
  }

  /* Mobile nav */
  .menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2xl);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 999;
  }

  .nav-links.open {
    opacity: 1;
    visibility: visible;
  }

  .nav-links .nav-link {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-black);
  }

  /* Hero */
  .hero {
    min-height: 100svh;
    padding: calc(var(--navbar-height) + var(--space-2xl)) 0 var(--space-4xl);
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  /* Products */
  .product-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  /* About */
  .about-layout {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .about-visual {
    max-width: 480px;
    margin: 0 auto;
  }

  /* Contact */
  .contact-actions {
    flex-direction: column;
  }

  .contact .cta-button {
    width: 100%;
    text-align: center;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-lg);
  }

  .footer-links {
    gap: var(--space-lg);
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.25rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

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