/* Layout container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Header style - transparent ice shelf feeling */
header {
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition-smooth);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 48px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.weather-widget {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  color: var(--accent-cyan);
}

.weather-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.header-top-links {
  display: flex;
  gap: 16px;
}

.header-top-links a:hover {
  color: var(--accent-cyan);
}

.header-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 0 16px 0;
}

.brand-section {
  text-align: center;
  margin-bottom: 16px;
}

.logo-main {
  font-family: var(--font-logo);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.logo-main a {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.logo-kr {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.35em;
  margin-top: 4px;
  margin-left: 0.35em; /* Center correction for letter-spacing */
  color: var(--text-secondary);
}

.slogan {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-top: 6px;
  font-style: italic;
}

/* Navigation - Quiet, spacious and clean */
nav.nav-bar {
  width: 100%;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  padding: 8px 0;
  background-color: var(--bg-primary);
}

.nav-links {
  display: flex;
  justify-content: center;
  list-style: none;
  gap: 40px;
}

.nav-links li a {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  position: relative;
  padding: 4px 0;
}

.nav-links li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1.5px;
  background-color: var(--accent-cyan);
  transition: var(--transition-smooth);
  transform: translateX(-50%);
}

.nav-links li a:hover {
  color: var(--accent-cyan);
}

.nav-links li a:hover::after,
.nav-links li.active a::after {
  width: 100%;
}

.nav-links li.active a {
  color: var(--accent-cyan);
  font-weight: 600;
}

/* Secondary informational utility page styling (About, Contact) */
.nav-links li#nav-about a,
.nav-links li#nav-contact a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

@media (min-width: 769px) {
  .nav-links li#nav-about {
    position: relative;
  }
  .nav-links li#nav-about::before {
    content: '';
    position: absolute;
    left: -20px; /* Exactly centered in the 40px gap between menu items */
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 12px;
    background-color: var(--border-medium);
  }
}

/* Mobile Menu controls */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  margin: 4px 0;
  transition: var(--transition-smooth);
}

.mobile-menu {
  display: none;
}

/* Layout Grids */
.section {
  padding-top: 40px;
  padding-bottom: 40px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

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

.grid-main-sidebar {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
}

/* Footer style - cold grey tone with comprehensive trust signals */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  padding: 60px 0 40px 0;
  margin-top: 60px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-light);
}

.footer-brand .footer-logo {
  font-family: var(--font-logo);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.footer-brand .footer-slogan {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.8rem;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.footer-principle {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  border-left: 2px solid var(--accent-cyan);
  padding-left: 12px;
  margin-top: 16px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.footer-links-col h4 {
  font-family: var(--font-sans);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-links-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-col ul a:hover {
  color: var(--accent-cyan);
  padding-left: 4px;
}

.footer-contact-info p {
  margin-bottom: 8px;
  line-height: 1.5;
}

.footer-contact-info strong {
  color: var(--text-primary);
}

/* Trust Signals Area */
.footer-trust-signals {
  padding: 30px 0;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}

.trust-card {
  flex: 1 1 200px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.trust-card-icon {
  color: var(--accent-cyan);
  font-size: 1.2rem;
  font-weight: 700;
}

.trust-card-content h5 {
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.trust-card-content p {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Footer Bottom: copyright and legal info */
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 30px;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  font-weight: 500;
}

.footer-bottom-links a.privacy-link {
  color: var(--text-secondary);
  font-weight: 600;
}

.footer-bottom-links a:hover {
  color: var(--accent-cyan);
}

/* Responsive Rules for Layout */
@media (max-width: 992px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-main-sidebar {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .footer-top > div:first-child {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .container {
    padding-left: 16px !important;
    padding-right: 16px !important;
  }
  .header-top {
    flex-direction: row !important;
    justify-content: center !important;
    height: 32px !important;
    padding: 4px 0 !important;
    font-size: 0.72rem !important;
  }
  .header-meta {
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    gap: 10px !important;
    white-space: nowrap !important;
  }
  .header-top-links {
    display: none !important;
  }
  .header-main {
    padding: 16px 0 12px 0;
    flex-direction: row;
    justify-content: space-between;
  }
  .brand-section {
    text-align: left;
    margin-bottom: 0;
  }
  .logo-main {
    font-size: 1.8rem;
    align-items: flex-start;
  }
  .logo-main a {
    align-items: flex-start;
  }
  .logo-kr {
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    margin-top: 2px;
  }
  .slogan {
    display: none; /* Hide slogan on mobile to save vertical space */
  }
  
  nav.nav-bar {
    display: none; /* Hidden by default on mobile, toggled with JS */
  }
  
  /* Mobile menu open state classes */
  nav.nav-bar.active {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    border-bottom: 2px solid var(--border-medium);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    z-index: 99;
  }
  
  nav.nav-bar.active .nav-links {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
    gap: 16px;
  }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  
  .footer-top > div:first-child {
    grid-column: span 1;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
  .footer-bottom-links {
    flex-wrap: wrap;
    gap: 12px;
  }
}