/* Mobile-first responsive optimizations */

@media (max-width: 768px) {
  body { font-size: 15px; }

  .container { padding: 0 16px; }

  /* 모바일 헤더: 데스크톱 3열 그리드 대신 flex(로고 좌·햄버거 우), 헤더/로고 축소 */
  :root { --header-h: 66px; }
  .site-header .container { display: flex; justify-content: space-between; align-items: center; padding: 0 16px; }
  .logo { flex-shrink: 0; }
  .logo img { height: 40px; max-width: none; }
  .header-actions { justify-self: auto; }

  /* 햄버거 패널은 흰 배경이므로 최상위 메뉴도 진한 글자로 (투명헤더 흰색 규칙 무효화) */
  body.nav-overlay .site-header:not(.scrolled) .primary-nav > a,
  body.nav-overlay .site-header:not(.scrolled) .primary-nav > .has-sub > a { color: var(--c-fg); }

  /* 메뉴 항목: 전체 너비 + 좌측정렬 */
  .primary-nav { align-items: stretch; }
  .primary-nav > a, .primary-nav .has-sub > a { display: block; text-align: left; }
  .primary-nav .caret { display: none; }

  /* 아코디언: 하위메뉴 접힘 → 부모(또는 +) 탭 시 펼침, 표시는 +/− (네이비, 우측 끝) */
  .primary-nav .sub { display: none; }
  .primary-nav .has-sub.open .sub { display: block; }
  .primary-nav .has-sub > a { position: relative; padding-right: 52px; }
  .primary-nav .has-sub > a::after {
    content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
    font-size: 26px; font-weight: 400; line-height: 1; color: var(--c-primary);
  }
  .primary-nav .has-sub.open > a::after { content: "\2212"; }
  .primary-nav .sub li a { text-align: left; padding-left: 40px; }
  .primary-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    width: 100vw; max-width: 100vw; justify-self: stretch;
    flex-direction: column; gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-line);
    padding: 8px 0;
    transform: translateY(calc(-100% - var(--header-h) - 20px));
    transition: transform .25s ease;
    box-shadow: var(--shadow-md);
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .primary-nav.open { transform: translateY(0); }
  .primary-nav a { padding: 15px 24px; border-bottom: 1px solid var(--c-line-2); font-size: 16px; text-align: left; }
  .primary-nav a:last-child { border-bottom: 0; }
  .nav-toggle { display: flex; }

  /* 다국어 선택을 햄버거 메뉴 안으로 이동 */
  .header-actions .lang-switcher { display: none; }
  .nav-lang { display: block; padding: 16px 20px 6px; border-top: 1px solid var(--c-line); margin-top: 4px; }
  .nav-lang-label { display: block; font-size: 11px; font-weight: 700; letter-spacing: .18em; color: var(--c-muted); margin-bottom: 12px; }
  .nav-lang-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
  .primary-nav .nav-lang-links a { display: block; padding: 9px 4px; text-align: center; white-space: nowrap; border: 1px solid var(--c-line); border-radius: 999px; font-size: 13px; font-weight: 500; color: var(--c-fg); }
  .primary-nav .nav-lang-links a.on { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

  .hero { padding: 56px 0 40px; }
  .hero-title { font-size: 34px; }
  .hero-subtitle { font-size: 16px; }

  .two-col { grid-template-columns: 1fr; gap: 16px; padding: 32px 16px; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); padding: 32px 16px 56px; gap: 10px; }
  .feature-tile { padding: 18px 8px; }
  .ft-icon { font-size: 22px; }
  .ft-title { font-size: 12px; }

  .board-head { flex-direction: column; align-items: stretch; gap: 12px; }
  .board-title { font-size: 22px; }
  .board-tools { flex-direction: column; align-items: stretch; }
  .search { width: 100%; }
  .search input { flex: 1; }

  .board-table .meta-col:nth-child(n+5) { display: none; }
  .board-table th, .board-table td { font-size: 13px; padding: 10px 6px; }

  .photo-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }

  .calendar td { min-height: 70px; height: 70px; padding: 4px; }
  .calendar td .d { font-size: 12px; }
  .cal-event { font-size: 10px; padding: 1px 4px; }

  .post-view { padding: 24px 16px 60px; }
  .post-head h1 { font-size: 22px; }
  .post-body { font-size: 15px; padding: 16px 0; }

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

  /* Popup mobile: image auto-resize, centered */
  .popup-stack {
    left: 16px !important; right: 16px !important; top: 50% !important;
    transform: translateY(-50%) !important;
    align-items: center;
  }
  .popup {
    width: calc(100vw - 32px) !important; max-width: 480px;
    margin: 0 auto;
  }
  .popup img { width: 100%; height: auto; }
}

@media (max-width: 480px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .calendar { font-size: 11px; }
  .calendar td { min-height: 56px; height: 56px; }
}

/* iOS notch / safe-area */
@supports (padding: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* Reduce motion respect */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}