/* ============================================
   Big Onion Factory - Style Sheet
   Toss-style Light Mode / Modern Minimal
   ============================================ */

/* --- Fonts --- */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* --- CSS Variables --- */
:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --text-primary: #1A1A1A;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: #EFF6FF;
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-en: 'Inter', sans-serif;
  --font-kr: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  --nav-height: 72px;
  --max-width: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-kr);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

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

input, textarea {
  font-family: inherit;
  border: none;
  outline: none;
}

/* --- Utility --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
}

.section--alt {
  background-color: var(--bg-secondary);
}

.section-label {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
}

/* --- Scroll Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: border-color var(--transition), background var(--transition);
}

.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(255, 255, 255, 0.95);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.nav__logo span {
  color: var(--accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav__link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.nav__link:hover::after {
  width: 100%;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  padding: 4px 0;
}

.nav__hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  padding: 40px 24px;
  z-index: 999;
}

.nav__mobile.open {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav__mobile-link {
  font-size: 28px;
  font-weight: 600;
  padding: 16px 0;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
  transition: color var(--transition);
}

.nav__mobile-link:hover {
  color: var(--accent);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  background: var(--bg-primary);
}

.hero__inner {
  padding: 80px 0;
}

.hero__label {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s 0.2s forwards;
}

.hero__title {
  font-family: var(--font-en);
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 28px;
  max-width: 800px;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s 0.4s forwards;
}

.hero__desc {
  font-size: 20px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s 0.6s forwards;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--accent);
  padding: 16px 36px;
  border-radius: 100px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s 0.8s forwards;
}

.hero__cta:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.hero__cta svg {
  transition: transform var(--transition);
}

.hero__cta:hover svg {
  transform: translateX(4px);
}

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

/* ============================================
   About Section
   ============================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-top: 60px;
}

.about__text p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.about__stat {
  padding: 32px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.about__stat:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.about__stat-number {
  font-family: var(--font-en);
  font-size: 40px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.about__stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ============================================
   Brands Section
   ============================================ */
.brands__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.brand-card {
  padding: 48px 36px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.brand-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.brand-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 800;
  color: #FFFFFF;
}

.brand-card__icon--vivalab { background: #1A1A1A; }
.brand-card__icon--posepop { background: #E11D48; }
.brand-card__icon--lunant { background: #7C3AED; }

.brand-card__name {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.brand-card__tagline {
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 20px;
}

.brand-card__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.brand-card__link {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition);
}

.brand-card__link:hover {
  gap: 10px;
}

/* ============================================
   R&D Services Section
   ============================================ */
.services__list {
  margin-top: 60px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.service-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  padding: 32px 36px;
  background: var(--bg-primary);
  transition: background var(--transition);
}

.service-item:hover {
  background: var(--bg-secondary);
}

.service-item__number {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-tertiary);
  min-width: 32px;
}

.service-item__info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.service-item__title {
  font-size: 17px;
  font-weight: 600;
}

.service-item__meta {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  gap: 16px;
}

.service-item__tag {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  padding: 6px 14px;
  border-radius: 100px;
  white-space: nowrap;
}

.services__more {
  margin-top: 48px;
  text-align: center;
}

.services__more-link {
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  transition: gap var(--transition);
}

.services__more-link:hover {
  gap: 14px;
}

/* ============================================
   Contact Section
   ============================================ */
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  margin-top: 60px;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact__info p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.contact__detail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text-secondary);
}

.contact__detail svg {
  flex-shrink: 0;
  color: var(--accent);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-submit {
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--accent);
  padding: 16px 36px;
  border-radius: 100px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  align-self: flex-start;
  margin-top: 8px;
}

.form-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 60px 0 40px;
  background: var(--text-primary);
  color: #FFFFFF;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 48px;
}

.footer__logo {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 16px;
}

.footer__logo span {
  color: var(--accent);
}

.footer__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #9CA3AF;
  max-width: 320px;
}

.footer__links {
  display: flex;
  gap: 48px;
}

.footer__col-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #FFFFFF;
}

.footer__col a {
  display: block;
  font-size: 14px;
  color: #9CA3AF;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer__col a:hover {
  color: #FFFFFF;
}

.footer__bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #6B7280;
}

/* ============================================
   Services Page (services.html)
   ============================================ */
.page-header {
  padding: 160px 0 80px;
  background: var(--bg-secondary);
}

.page-header__title {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.page-header__desc {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.services-page__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.service-card {
  padding: 40px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.service-card__category {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  padding: 6px 14px;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 20px;
}

.service-card__title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.service-card__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.service-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--text-tertiary);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 40px;
  transition: gap var(--transition);
}

.back-link:hover {
  gap: 12px;
}

/* ============================================
   In-App Browser Banner
   ============================================ */
.inapp-banner {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 9999;
  padding: 40px 24px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.inapp-banner.show {
  display: flex;
}

.inapp-banner__icon {
  font-size: 48px;
  margin-bottom: 24px;
}

.inapp-banner__title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.inapp-banner__desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 360px;
}

.inapp-banner__btn {
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--accent);
  padding: 16px 36px;
  border-radius: 100px;
}

/* ============================================
   Responsive — Mobile First
   ============================================ */

/* Tablet (768px) */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .section {
    padding: 80px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .section-desc {
    font-size: 16px;
  }

  /* Nav */
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  /* Hero */
  .hero__inner {
    padding: 40px 0;
  }

  .hero__desc {
    font-size: 17px;
  }

  /* About */
  .about__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .about__stat {
    padding: 24px;
  }

  .about__stat-number {
    font-size: 32px;
  }

  /* Brands */
  .brands__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .brand-card {
    padding: 36px 28px;
  }

  /* Services */
  .service-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 24px;
  }

  .service-item__number {
    display: none;
  }

  .service-item__tag {
    justify-self: flex-start;
  }

  /* Contact */
  .contact__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
  }

  .footer__links {
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  /* Services Page */
  .page-header {
    padding: 120px 0 60px;
  }

  .page-header__title {
    font-size: 32px;
  }

  .services-page__grid {
    grid-template-columns: 1fr;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .container {
    padding: 0 40px;
  }

  .section {
    padding: 140px 0;
  }

  .section-title {
    font-size: 42px;
  }
}