/* ============================================================
   GROWTHUP Layout — BLACK EDITORIAL v8
   Nav, Footer, Common Components
   ============================================================ */

/* ─── Header / Navigation ─── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(0, 0, 0, 0.94);
  border-bottom-color: var(--color-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-px);
  gap: var(--space-8);
}

/* ─── Logo ─── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

/* 내비 SVG 로고 */
.nav-logo-svg {
  height: 28px;
  width: auto;
  display: block;
  overflow: visible;
}

/* 푸터 SVG 로고 */
.footer-logo-svg {
  height: 20px;
  width: auto;
  display: block;
  margin-bottom: var(--space-6);
  overflow: visible;
}

/* SVG 워드마크 (이미지 없을 때 폴백) */
.nav-logo-text {
  font-size: 1.1rem;
  font-weight: var(--font-black);
  letter-spacing: -0.04em;
  color: var(--color-white);
  line-height: 1;
  position: relative;
}

.nav-logo-star {
  position: absolute;
  top: -6px;
  right: -10px;
  width: 7px;
  height: 7px;
  pointer-events: none;
}

/* ─── Desktop Nav ─── */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
  justify-content: center;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-white);
}

/* Dropdown chevron */
.nav-chevron {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
  opacity: 0.5;
}

.nav-item:hover .nav-chevron {
  transform: rotate(180deg);
}

/* ─── Dropdown ─── */
.nav-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0;
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-item {
  display: flex;
  flex-direction: column;
  padding: var(--space-3) var(--space-4);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-white);
}

.nav-dropdown-item strong {
  display: block;
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  font-size: var(--text-sm);
  margin-bottom: 2px;
}

.nav-dropdown-item small {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.nav-dropdown-item.external::after {
  content: '↗';
  font-size: var(--text-xs);
  margin-left: auto;
  opacity: 0.4;
}

/* ─── Nav Actions (right side) ─── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.nav-cta {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-cta:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.04);
}

/* ─── Mobile Menu Toggle ─── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 6px;
  cursor: pointer;
  border: none;
  background: none;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text-primary);
  border-radius: 0;
  transition: transform var(--transition-base), opacity var(--transition-fast), width var(--transition-base);
  transform-origin: center;
}

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

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

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

/* ─── Mobile Menu Panel ─── */
.mobile-menu {
  position: fixed;
  inset: 0;
  top: var(--nav-height);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  z-index: var(--z-fixed);
  overflow-y: auto;
  padding: var(--space-8) var(--container-px) var(--space-16);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) 0;
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  border-bottom: 1px solid var(--color-border-soft);
  transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--text-secondary);
}

.mobile-nav-sub {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) 0 var(--space-4);
  border-bottom: 1px solid var(--color-border-soft);
}

.mobile-nav-sub.open {
  display: flex;
}

.mobile-nav-sub-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.mobile-nav-sub-item:hover {
  color: var(--text-primary);
}

.mobile-cta {
  margin-top: var(--space-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* ─── Footer ─── */
.site-footer {
  background: var(--color-bg-2);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-20);
  padding-bottom: var(--space-10);
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-16);
  margin-bottom: var(--space-16);
}

.footer-brand {
  flex: 0 0 auto;
  max-width: 320px;
}

/* footer-logo-img 레거시 제거 (SVG로 대체됨) */

.footer-logo-text {
  font-size: 1.1rem;
  font-weight: var(--font-black);
  letter-spacing: -0.04em;
  color: var(--color-white);
  margin-bottom: var(--space-6);
  display: block;
  position: relative;
  display: inline-block;
}

.footer-brand-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.footer-star {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
}

.footer-col h4 {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col ul a {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
}

.footer-col ul a:hover {
  color: var(--text-primary);
}

/* Legacy grid support */
.footer-grid-legacy {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: var(--tracking-wide);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-8);
}

.footer-bottom-links a {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: var(--tracking-wide);
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: var(--text-secondary);
}

/* ─── Page Header (서브페이지 공통) ─── */
.page-hero {
  padding-top: calc(var(--nav-height) + var(--space-20));
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--color-border);
}

.page-hero .label {
  margin-bottom: var(--space-6);
}

.page-hero h1 {
  margin-bottom: var(--space-6);
}

.page-hero p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: var(--leading-relaxed);
}

/* ─── Back-to-top ─── */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 40px;
  height: 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-base), transform var(--transition-base), border-color var(--transition-fast);
  z-index: var(--z-raised);
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.3);
}

/* ─── Responsive Nav ─── */
@media (max-width: 1024px) {
  .nav-menu,
  .nav-actions .nav-cta {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }
}

@media (max-width: 768px) {
  .footer-top {
    flex-direction: column;
    gap: var(--space-10);
  }

  .footer-brand {
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }

  .footer-grid-legacy {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer-grid-legacy .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    right: var(--space-4);
    bottom: var(--space-4);
  }
}