/* ===================================================
   LAYOUT — 네비게이션, 푸터, 그리드 · v3
   =================================================== */

/* ── 네비게이션 ──────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 62px;
  background: transparent;
  backdrop-filter: blur(0);
  border-bottom: 1px solid transparent;
  transition:
    background var(--duration-base),
    backdrop-filter var(--duration-base),
    border-color var(--duration-base);
}
.nav--scrolled {
  background: rgba(9,9,14,0.88);
  backdrop-filter: blur(28px) saturate(1.4);
  border-bottom-color: rgba(255,255,255,0.06);
  box-shadow: 0 1px 0 rgba(124,106,245,0.12);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
}
.nav__logo-img { height: 28px; width: auto; }

/* 로고 텍스트 스타일 (옵셔널) */
.nav__logo-text {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav__links a {
  display: block;
  padding: 0.38rem 0.8rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background var(--duration-fast);
  position: relative;
}
.nav__links a:hover { color: var(--text-primary); }
.nav__links a.active {
  color: var(--text-primary);
}
.nav__links a.active::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 50%; right: 50%;
  height: 1.5px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  border-radius: 2px;
  animation: activeUnderline 0.3s var(--ease-out-expo) forwards;
}
@keyframes activeUnderline {
  from { left: 50%; right: 50%; }
  to   { left: 0.8rem; right: 0.8rem; }
}

.nav__new {
  display: inline-block;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  color: #fff;
  font-size: 0.55rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 1px 4px;
  border-radius: 3px;
  vertical-align: super;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.nav__search-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: var(--glass-bg);
  border: var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color var(--duration-fast), background var(--duration-fast), border-color var(--duration-fast);
}
.nav__search-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg-hover);
  border-color: rgba(124,106,245,0.3);
}

.nav__github {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.38rem 0.9rem;
  background: var(--violet-dim);
  border: var(--border-violet);
  border-radius: var(--radius-sm);
  color: var(--violet-light);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  transition: all var(--duration-fast);
}
.nav__github:hover {
  background: rgba(124,106,245,0.2);
  border-color: rgba(124,106,245,0.5);
  color: #fff;
  box-shadow: 0 0 16px rgba(124,106,245,0.25);
}

/* 햄버거 */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 34px; height: 34px;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: var(--border-glass);
  border-radius: var(--radius-sm);
}
.nav__hamburger span {
  display: block;
  width: 17px; height: 1.5px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: background var(--duration-fast);
}
.nav__hamburger:hover span { background: var(--text-primary); }

/* 모바일 메뉴 */
.nav__mobile {
  display: none;
  position: fixed;
  top: 62px; left: 0; right: 0;
  z-index: calc(var(--z-nav) - 1);
  background: rgba(9,9,14,0.97);
  backdrop-filter: blur(28px);
  border-bottom: 1px solid rgba(124,106,245,0.12);
  padding: 0.75rem 1rem;
  flex-direction: column;
  gap: 0.2rem;
}
.nav__mobile.open { display: flex; }
.nav__mobile a {
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--duration-fast), background var(--duration-fast);
}
.nav__mobile a:hover { color: #fff; background: var(--violet-dim); }

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
}
@media (max-width: 600px) {
  .nav { padding: 0 1.25rem; }
  .nav__github span { display: none; }
}

/* ── 컨테이너 ─────────────────────────────────────── */
.container {
  max-width: 1380px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4.5vw, 3rem);
}
.container--narrow { max-width: 860px; margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 2.5rem); }

/* ── 목록 레이아웃 ────────────────────────────────── */
.listing-layout {
  display: grid;
  grid-template-columns: 240px 1fr 220px;
  gap: 2rem;
  padding-top: 6rem;
  padding-bottom: 4rem;
  align-items: start;
}
@media (max-width: 1200px) {
  .listing-layout { grid-template-columns: 220px 1fr; }
  .sidebar--right { display: none; }
}
@media (max-width: 860px) {
  .listing-layout { grid-template-columns: 1fr; }
  .sidebar--left { display: none; }
}

/* ── 사이드바 ─────────────────────────────────────── */
.sidebar { position: sticky; top: 80px; }

.filter-panel {
  background: var(--bg-elevated);
  border: var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.filter-panel__title {
  padding: 0.85rem 1.1rem;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.02);
}
.filter-panel__section {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.filter-panel__section:last-child { border-bottom: none; }
.filter-panel__label {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.filter-panel__sort {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-family: var(--font-korean);
}
.filter-panel__sort option { background: var(--bg-elevated); }
.filter-panel__tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.25rem; }

/* ── 푸터 ─────────────────────────────────────────── */
.footer {
  background: var(--bg-base);
  border-top: 1px solid rgba(124,106,245,0.1);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-section);
  position: relative;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  width: 60%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--violet), var(--cyan), transparent);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-10);
}
.footer__logo {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--violet-light);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.footer__tagline {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.75;
}
.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}
.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer__links a {
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--duration-fast);
}
.footer__links a:hover { color: var(--violet-light); }
.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.04);
  font-size: var(--text-xs);
  color: var(--text-disabled);
  font-family: var(--font-mono);
}
@media (max-width: 900px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
}
@media (max-width: 600px) {
  .footer__grid { grid-template-columns: 1fr; }
}