/* ============================================
   HEADER / NAVIGATION / FOOTER
   애플어학원 (Apple Language Academy)
   ============================================ */

@import url('./tokens.css');

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal), padding var(--transition-normal);
  background-color: transparent;
}

.header.scrolled {
  background-color: var(--color-white);
  box-shadow: 0 2px 20px rgba(44, 39, 80, 0.1);
  padding: 0.625rem 0;
}

/* Logo */
.header-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo img {
  height: 40px;
  width: auto;
}

/* ===== NAV LINKS ===== */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-primary);
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
  transition: color var(--transition-fast);
}

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

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

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

.nav-link.active {
  color: var(--color-accent-red);
}

/* ===== NAV CTA ===== */
.nav-cta {
  margin-left: var(--space-sm);
}

/* ===== HAMBURGER ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

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

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

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

/* ===== MOBILE NAV ===== */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 85vw);
    height: 100vh;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem var(--space-lg) var(--space-lg);
    gap: var(--space-md);
    box-shadow: -4px 0 20px rgba(44, 39, 80, 0.15);
    transition: right var(--transition-normal);
    z-index: 999;
    overflow-y: auto;
  }

  .nav-menu.is-open {
    right: 0;
  }

  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 998;
  }

  .nav-overlay.is-open {
    display: block;
  }

  .nav-cta {
    margin-left: 0;
    width: 100%;
    text-align: center;
  }

  .header {
    background-color: var(--color-white);
  }

  .nav-link {
    font-size: 1.0625rem;
    padding: var(--space-xs) 0;
  }
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer a {
  text-decoration: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-top: var(--space-sm);
}

.footer-heading {
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-link {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

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

.footer-contact-item {
  display: flex;
  gap: var(--space-xs);
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ===== FOOTER RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}