/* Font Face */
@font-face {
  font-family: 'Noto Sans KR';
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/NotoSansKR-Regular.ttf') format('truetype');
}
@font-face {
  font-family: 'Noto Sans KR';
  font-weight: 500;
  font-display: swap;
  src: url('/fonts/NotoSansKR-Medium.ttf') format('truetype');
}
@font-face {
  font-family: 'Noto Sans KR';
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/NotoSansKR-Bold.ttf') format('truetype');
}
@font-face {
  font-family: 'Noto Sans KR';
  font-weight: 800;
  font-display: swap;
  src: url('/fonts/NotoSansKR-ExtraBold.ttf') format('truetype');
}

/* Body */
body {
  font-family: var(--font-primary);
  background: var(--background);
  color: var(--foreground);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* Section */
.section {
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
}

@media (min-width: 640px) {
  .section {
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
  }
}

.section--gray {
  background-color: var(--charcoal-50);
}

.section--dark {
  background: linear-gradient(135deg, var(--charcoal-700) 0%, var(--charcoal-900) 100%);
  color: var(--gold-100);
}

/* Section Header */
.section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section__badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  background-color: var(--gold-50);
  color: var(--gold-600);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
  letter-spacing: var(--letter-wide);
}

.section__title {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--charcoal-800);
  margin-bottom: var(--space-4);
  line-height: 1.2;
  letter-spacing: var(--letter-tight);
}

@media (min-width: 640px) {
  .section__title {
    font-size: var(--text-4xl);
  }
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--charcoal-400);
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
  line-height: var(--line-normal);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* Card System:
 * .card               - Base card (bg, radius, padding, shadow-lg, hover effect)
 * .card--glass        - Glass morphism variant
 * .card--dark         - Dark background variant
 * Page-specific:
 *   .review-card      - home.css: customer reviews
 *   .vision-card      - about.css: company vision items
 *   .contact-card     - contact.css: contact method cards
 *   .partner-card     - partners.css: partner company cards
 *   .step-card        - facility.css: process step cards
 *   .nokcha-product   - nokcha-yu.css: product listing cards
 *   .nokcha-case      - nokcha-yu.css: use case cards
 */
.card {
  background: var(--background);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--charcoal-100);
  transition: transform var(--transition-elegant), box-shadow var(--transition-elegant), border-color var(--transition-elegant);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--gold-200);
}

.card--glass {
  background: rgba(255,253,249,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,253,249,0.3);
}

.card--dark {
  background: linear-gradient(135deg, var(--charcoal-700) 0%, var(--charcoal-800) 100%);
  color: var(--gold-100);
  border: 1px solid var(--charcoal-600);
}

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: all var(--transition-elegant);
  text-decoration: none;
  letter-spacing: var(--letter-wide);
}

.btn--primary {
  background: linear-gradient(135deg, var(--charcoal-700) 0%, var(--charcoal-800) 100%);
  color: var(--gold-100);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--charcoal-600) 0%, var(--charcoal-700) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--gold {
  background: linear-gradient(135deg, var(--gold-400) 0%, var(--gold-500) 100%);
  color: var(--charcoal-900);
}

.btn--gold:hover {
  background: linear-gradient(135deg, var(--gold-300) 0%, var(--gold-400) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.btn--outline {
  background: transparent;
  color: var(--charcoal-600);
  border: 1px solid var(--charcoal-200);
}

.btn--outline:hover {
  background: var(--charcoal-50);
  border-color: var(--gold-300);
  color: var(--charcoal-700);
}

.btn--white {
  background: var(--background);
  color: var(--charcoal-800);
}

.btn--white:hover {
  background: var(--gold-50);
  transform: translateY(-2px);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: var(--text-lg);
  border-radius: var(--radius-2xl);
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero--small {
  min-height: 36vh;
}

.hero--medium {
  min-height: 50vh;
}

.hero--subpage {
  min-height: 45vh;
}

.hero--feature {
  min-height: 75vh;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(30,27,24,0.8) 0%, rgba(30,27,24,0.3) 50%, rgba(30,27,24,0.15) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--gold-50);
  padding: var(--space-4);
}

.hero__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  line-height: var(--line-tight);
  letter-spacing: var(--letter-tight);
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--text-5xl);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: var(--text-6xl);
  }
}

.hero__subtitle {
  font-size: var(--text-lg);
  opacity: 0.9;
  max-width: 36rem;
  margin: 0 auto;
  line-height: var(--line-normal);
}

@media (min-width: 768px) {
  .hero__subtitle {
    font-size: var(--text-xl);
  }
}

/* CTA Section */
.cta {
  background: linear-gradient(135deg, var(--charcoal-700) 0%, var(--charcoal-900) 100%);
  color: var(--gold-100);
  padding: var(--space-16) var(--space-4);
  text-align: center;
  border-top: 1px solid var(--gold-400);
}

.cta__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: var(--letter-tight);
}

@media (min-width: 768px) {
  .cta__title {
    font-size: var(--text-3xl);
  }
}

.cta__text {
  color: var(--charcoal-300);
  margin-bottom: var(--space-8);
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

/* ===========================
   SCROLL ANIMATIONS
   =========================== */
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0) translateX(0) scale(1);
}

/* Variants */
[data-animate="fade-up"] { transform: translateY(20px); }
[data-animate="fade-down"] { transform: translateY(-20px); }
[data-animate="fade-left"] { transform: translateX(-20px); }
[data-animate="fade-right"] { transform: translateX(20px); }
[data-animate="zoom-in"] { transform: scale(0.92); }
[data-animate="fade"] { transform: none; }

/* Stagger delays */
[data-delay="100"] { transition-delay: 100ms; }
[data-delay="200"] { transition-delay: 200ms; }
[data-delay="300"] { transition-delay: 300ms; }
[data-delay="400"] { transition-delay: 400ms; }
[data-delay="500"] { transition-delay: 500ms; }
[data-delay="600"] { transition-delay: 600ms; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  [data-animate] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ===========================
   HERO LOAD ANIMATION
   =========================== */
@keyframes hero-fade-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__content > * {
  animation: hero-fade-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  opacity: 0;
}

.hero__content > *:nth-child(1) { animation-delay: 0.2s; }
.hero__content > *:nth-child(2) { animation-delay: 0.4s; }
.hero__content > *:nth-child(3) { animation-delay: 0.6s; }
.hero__content > *:nth-child(4) { animation-delay: 0.8s; }

@media (prefers-reduced-motion: reduce) {
  .hero__content > * {
    animation: none;
    opacity: 1;
  }
}

/* ===========================
   CARD HOVER ENHANCEMENT
   =========================== */
.card {
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,253,249,0.08));
  opacity: 0;
  transition: opacity var(--transition-elegant);
  pointer-events: none;
  z-index: 1;
}

.card:hover::before {
  opacity: 1;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--charcoal-50); }
::-webkit-scrollbar-thumb { background: var(--charcoal-200); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--charcoal-300); }