:root {
  color-scheme: light dark;
  --bg: #f4eee2;
  --surface: #ffffff;
  --border: #e3d9c6;
  --text: #2e3440;
  --text-muted: #6b7280;
  --accent: #5e81ac;
  --accent-text: #eceff4;
  --overlay: rgba(46, 52, 64, .92);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #2e3440;
    --surface: #3b4252;
    --border: #4c566a;
    --text: #eceff4;
    --text-muted: #d8dee9;
    --accent: #88c0d0;
    --accent-text: #2e3440;
    --overlay: rgba(20, 23, 29, .92);
  }
}

:root[data-theme="dark"] {
  --bg: #2e3440;
  --surface: #3b4252;
  --border: #4c566a;
  --text: #eceff4;
  --text-muted: #d8dee9;
  --accent: #88c0d0;
  --accent-text: #2e3440;
  --overlay: rgba(20, 23, 29, .92);
}

:root[data-theme="light"] {
  --bg: #f4eee2;
  --surface: #ffffff;
  --border: #e3d9c6;
  --text: #2e3440;
  --text-muted: #6b7280;
  --accent: #5e81ac;
  --accent-text: #eceff4;
  --overlay: rgba(46, 52, 64, .92);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: -apple-system, system-ui, sans-serif; }

.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; }
@media (min-width: 700px) { .grid { grid-template-columns: repeat(4, 1fr); } }
.thumb { position: relative; display: block; aspect-ratio: 1; overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.empty { padding: 3rem 1.5rem; text-align: center; color: var(--text-muted); }

.gallery-header { position: sticky; top: 0; z-index: 5; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: .5rem; padding: .75rem 1rem; background: var(--surface); border-bottom: 1px solid var(--border); }
.header-side { display: flex; }
.header-side-right { justify-content: flex-end; }
.header-center { justify-self: center; }

.select-toggle { padding: .5rem .9rem; border-radius: 10px; background: var(--surface); border: 1px solid var(--border); color: var(--text); font-size: .9rem; cursor: pointer; }
.tag-pills { display: flex; gap: .5rem; flex-wrap: wrap; }
.tag-pill { padding: .4rem .9rem; border-radius: 999px; border: 1px solid var(--border); color: var(--text-muted); text-decoration: none; font-size: .85rem; }
.tag-pill.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.thumb-check { display: none; position: absolute; top: 6px; right: 6px; width: 22px; height: 22px; border-radius: 50%; border: 2px solid #fff; background: rgba(0,0,0,.35); }
body.selecting .thumb-check { display: block; }
.thumb.selected .thumb-check { background: var(--accent); border-color: var(--accent); }
.thumb.selected img { opacity: .7; }

.select-bar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 6; display: none; align-items: center; justify-content: space-between; gap: 1rem; padding: .8rem 1.2rem; background: var(--surface); border-top: 1px solid var(--border); }
.select-bar.open { display: flex; }
.select-count { color: var(--text-muted); font-size: .9rem; white-space: nowrap; }
.select-actions { display: flex; gap: .5rem; }
.select-actions .btn-ghost { width: auto; padding: .6rem 1rem; }

.viewer { position: fixed; inset: 0; background: var(--overlay); display: none; align-items: center; justify-content: center; z-index: 10; }
.viewer.open { display: flex; }
.viewer-frame { position: relative; display: inline-flex; max-width: 100%; max-height: 90vh; }
.viewer-frame img { max-width: 100%; max-height: 90vh; display: block; }
.viewer-topbar { position: absolute; top: 0; left: 0; right: 0; z-index: 2; display: flex; justify-content: space-between; align-items: center; padding: .8rem 1rem; }
.viewer-actions { display: flex; gap: .4rem; }
.icon-btn { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; background: rgba(0,0,0,.5); border: none; color: #fff; font-size: 1.1rem; text-decoration: none; cursor: pointer; }
.icon-btn:hover { background: rgba(0,0,0,.7); }
.viewer .nav { position: absolute; top: 50%; transform: translateY(-50%); width: 48px; height: 48px; padding: 0; font-size: 1.8rem; line-height: 1; border-radius: 50%; background: rgba(255,255,255,.12); border: none; color: #eceff4; cursor: pointer; }
.viewer .nav:hover { background: rgba(255,255,255,.22); }
.viewer .nav-prev { left: 1rem; }
.viewer .nav-next { right: 1rem; }
@media (max-width: 700px) { .viewer .nav { display: none; } }

.menu-btn { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; border-radius: 10px; background: var(--surface); border: 1px solid var(--border); color: var(--text); text-decoration: none; }
.admin-menu { display: flex; flex-direction: column; gap: 1rem; }
.upload-btn { width: 100%; display: flex; align-items: center; justify-content: center; gap: .5rem; }
.theme-switcher { display: flex; gap: .5rem; }
.theme-switcher button { flex: 1; padding: .7rem .5rem; border-radius: 10px; border: 1px solid var(--border); background: transparent; color: var(--text); font-size: .9rem; cursor: pointer; }
.theme-switcher button.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

.auth { min-height: 100dvh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 1.5rem; gap: 1.25rem; text-align: center; }
.auth h1 { font-size: 1.4rem; font-weight: 600; margin: 0 0 .5rem; }
.auth-card { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: 1rem; }
.btn { width: 100%; font-size: 1.1rem; padding: .9rem 1rem; border-radius: 12px; border: none; background: var(--accent); color: var(--accent-text); font-weight: 600; cursor: pointer; }
.btn:disabled { opacity: .4; }
.btn-ghost { width: 100%; font-size: 1rem; padding: .8rem 1rem; border-radius: 12px; border: 1px solid var(--border); background: transparent; color: var(--text); cursor: pointer; }
.field { width: 100%; font-size: 1.1rem; padding: .9rem 1rem; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); color: var(--text); }
.field::placeholder { color: var(--text-muted); }
.divider { display: flex; align-items: center; gap: .75rem; color: var(--text-muted); font-size: .85rem; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.auth-status { min-height: 1.2rem; color: var(--text-muted); font-size: .95rem; }
.auth-back { color: var(--text-muted); text-decoration: none; font-size: .95rem; }
.trash-item { display: flex; gap: 1rem; align-items: center; text-align: left; }
.trash-item img { width: 64px; height: 64px; object-fit: cover; border-radius: 8px; }
.trash-item p { margin: 0 0 .4rem; color: var(--text-muted); font-size: .9rem; }