/* ── Theme tokens ─────────────────────────── */
:root[data-theme="dark"] {
  --bg: #0e0e10;
  --bg-elev: #17171b;
  --bg-elev-2: #1f1f25;
  --border: #26262d;
  --text: #e9e9ec;
  --text-dim: #9a9aa3;
  --accent: #f5a623;
  --danger: #e85a5a;
  --overlay: rgba(0, 0, 0, 0.55);
  --shadow: 0 16px 60px rgba(0, 0, 0, 0.6);
}

:root[data-theme="light"] {
  --bg: #fafafa;
  --bg-elev: #ffffff;
  --bg-elev-2: #f0f0f3;
  --border: #e4e4e9;
  --text: #1a1a1f;
  --text-dim: #6b6b75;
  --accent: #d67c00;
  --danger: #c54343;
  --overlay: rgba(0, 0, 0, 0.35);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

/* ── Grid size tokens ─────────────────────── */
:root[data-grid="sm"] { --grid-min: 140px; --photo-min: 130px; }
:root[data-grid="md"] { --grid-min: 220px; --photo-min: 200px; }
:root[data-grid="lg"] { --grid-min: 300px; --photo-min: 280px; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Apple SD Gothic Neo',
               'Malgun Gothic', sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
input { font: inherit; }

/* ── Header ───────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  flex-shrink: 0;
}

.brand-mark { color: var(--accent); font-size: 22px; }
.brand-name { font-size: 17px; }

.header-search {
  flex: 0 1 320px;
}

.header-search input {
  width: 100%;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.header-search input:focus {
  border-color: var(--accent);
}

.crumbs {
  color: var(--text-dim);
  font-size: 14px;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.crumbs a:hover { color: var(--text); }
.crumbs .sep { margin: 0 8px; opacity: 0.4; }

.header-actions {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-shrink: 0;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-size: 20px;
  display: grid;
  place-items: center;
  transition: background 0.15s;
}

.icon-btn:hover { background: var(--bg-elev-2); }

/* ── Layout ───────────────────────────── */
.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 6px;
}

.page-sub {
  margin: 0 0 28px;
  color: var(--text-dim);
  font-size: 14px;
}

.loading, .empty {
  color: var(--text-dim);
  text-align: center;
  padding: 80px 0;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 20px;
  flex-wrap: wrap;
}

.btn-ghost, .btn-primary {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-size: 13px;
  transition: all 0.15s;
}

.btn-ghost:hover { background: var(--bg-elev-2); }

.btn-primary {
  background: var(--accent);
  color: #1a1a1a;
  border-color: var(--accent);
  font-weight: 600;
}

.btn-primary:hover { filter: brightness(1.08); }

.btn-primary[disabled], .btn-ghost[disabled] {
  opacity: 0.5; cursor: not-allowed;
}

/* ── Category grid ─────────────────────── */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--grid-min), 1fr));
  gap: 16px;
}

.cat-card {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  aspect-ratio: 4 / 3;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.cat-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.cat-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.cat-card:hover img { transform: scale(1.04); }

.cat-card.small { aspect-ratio: 1 / 1; }
.cat-card.small .cat-card-name { font-size: 15px; }

.cat-card-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 14px 16px;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 10%, rgba(0,0,0,0) 55%);
  color: #fff;
}

.cat-card-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  opacity: 0.95;
}

.cat-card-name {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 4px;
  line-height: 1.25;
}

.cat-card-meta {
  font-size: 12px;
  color: rgba(255,255,255,0.75);
}

.section-title {
  font-size: 17px;
  font-weight: 600;
  margin: 36px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.section-title:first-of-type { margin-top: 8px; }

/* ── Photo grid ───────────────────────── */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--photo-min), 1fr));
  gap: 10px;
}

.photo-card {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  background: var(--bg-elev);
  aspect-ratio: 1 / 1;
  cursor: zoom-in;
  border: 1px solid var(--border);
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.photo-card:hover img { transform: scale(1.04); opacity: 0.9; }

.photo-card-title {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 8px 10px;
  background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
  font-size: 12px;
  color: #fff;
  opacity: 0;
  transition: opacity 0.2s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.photo-card:hover .photo-card-title { opacity: 1; }

.photo-checkbox {
  position: absolute;
  top: 8px; left: 8px;
  width: 22px; height: 22px;
  border-radius: 6px;
  background: rgba(0,0,0,0.5);
  border: 2px solid #fff;
  display: none;
  z-index: 2;
  cursor: pointer;
  transition: background 0.15s;
}

.photo-card.selected .photo-checkbox {
  background: var(--accent);
  border-color: var(--accent);
}

.photo-card.selected .photo-checkbox::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #1a1a1a;
  font-weight: bold;
  font-size: 14px;
}

body.selection-mode .photo-checkbox { display: block; }
body.selection-mode .photo-card { cursor: pointer; }
body.selection-mode .photo-card.selected { outline: 3px solid var(--accent); outline-offset: -3px; }

/* ── Lightbox ────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(0, 0, 0, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 60px 80px;
  color: #fff;
}

.lightbox[hidden] { display: none; }

.lightbox-figure {
  margin: 0;
  max-width: 100%;
  max-height: 72vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-figure img {
  max-width: 100%;
  max-height: 65vh;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.lightbox-figure figcaption {
  margin-top: 14px;
  color: #bbb;
  font-size: 13px;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 18px; right: 22px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  border: none;
  color: #fff;
  font-size: 24px;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.22); }

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 64px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
  color: #fff;
  border: none;
  font-size: 36px;
  line-height: 1;
}
.lightbox-nav:hover { background: rgba(255,255,255,0.16); }
.lightbox-nav.prev { left: 18px; }
.lightbox-nav.next { right: 18px; }

.lightbox-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
  justify-content: center;
}

.lightbox-btn {
  padding: 10px 18px;
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  transition: background 0.15s;
}
.lightbox-btn:hover { background: rgba(255,255,255,0.18); }
.lightbox-btn.primary {
  background: var(--accent);
  color: #1a1a1a;
  font-weight: 600;
}
.lightbox-btn.primary:hover { filter: brightness(1.08); }
.lightbox-btn[disabled] { opacity: 0.5; cursor: not-allowed; }
.lightbox-btn.active { background: var(--accent); color: #1a1a1a; }

.lightbox-counter {
  margin-top: 12px;
  font-size: 12px;
  color: #888;
}

/* ── Right drawer (profile) ───────────── */
.panel-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: var(--overlay);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.panel-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}
.panel-backdrop[hidden] { display: none; }

.profile-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  max-width: 90vw;
  height: 100vh;
  z-index: 60;
  background: var(--bg-elev);
  border-left: 1px solid var(--border);
  box-shadow: -8px 0 40px rgba(0,0,0,0.3);
  transform: translateX(100%);
  transition: transform 0.28s cubic-bezier(0.3, 0.7, 0.3, 1);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.profile-panel.open { transform: translateX(0); }
.profile-panel[hidden] { display: none; }

.panel-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-elev-2);
  border: none;
  color: var(--text);
  font-size: 22px;
  z-index: 2;
}
.panel-close:hover { background: var(--border); }

.panel-content {
  padding: 28px 24px;
  flex: 1;
}

.panel-section { margin-bottom: 24px; }
.panel-section h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin: 0 0 10px;
  font-weight: 600;
}

.panel-user-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: var(--bg-elev-2);
  border-radius: 10px;
  margin-bottom: 24px;
}
.panel-user-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--accent);
  display: grid; place-items: center;
  color: #1a1a1a;
  font-weight: 700;
  font-size: 18px;
}
.panel-user-info { flex: 1; min-width: 0; }
.panel-user-email {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.panel-user-status {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}

.panel-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: background 0.12s;
}
.panel-link:hover { background: var(--bg-elev-2); }
.panel-link .arrow { margin-left: auto; opacity: 0.4; }

.panel-setting {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  gap: 10px;
}
.panel-setting label { font-size: 14px; }

.seg {
  display: inline-flex;
  background: var(--bg-elev-2);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--border);
}
.seg button {
  padding: 5px 12px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
}
.seg button.active {
  background: var(--bg-elev);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

/* Favorites tree inside panel */
.fav-tree { margin-top: 6px; }
.fav-folder {
  background: var(--bg-elev-2);
  border-radius: 8px;
  margin-bottom: 6px;
  overflow: hidden;
}
.fav-folder-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 14px;
}
.fav-folder-header:hover { background: var(--border); }
.fav-folder-name { flex: 1; font-weight: 500; }
.fav-folder-count { font-size: 11px; color: var(--text-dim); }
.fav-folder-actions {
  display: none;
  gap: 4px;
}
.fav-folder-header:hover .fav-folder-actions { display: flex; }
.fav-folder-action {
  width: 24px; height: 24px;
  border: none; background: transparent;
  color: var(--text-dim);
  border-radius: 4px;
  font-size: 14px;
  display: grid; place-items: center;
}
.fav-folder-action:hover { background: var(--bg-elev); color: var(--text); }
.fav-folder-action.danger:hover { color: var(--danger); }

.fav-folder-body {
  padding: 0 10px 10px;
  display: none;
}
.fav-folder.open .fav-folder-body { display: block; }

.fav-subfolder {
  background: var(--bg-elev);
  border-radius: 6px;
  margin-top: 4px;
  margin-left: 18px;
  padding: 8px 10px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.fav-subfolder:hover { background: var(--border); }

.fav-add-sub {
  margin-top: 8px;
  margin-left: 18px;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-dim);
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 6px;
  width: calc(100% - 18px);
  text-align: left;
}
.fav-add-sub:hover { color: var(--text); border-color: var(--text-dim); }

.fav-new-btn {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 4px;
}
.fav-new-btn:hover { color: var(--text); border-color: var(--text-dim); }

.recent-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.recent-strip img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid var(--border);
}
.recent-strip img:hover { border-color: var(--accent); }

/* Auth forms */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.auth-form input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev-2);
  color: var(--text);
}
.auth-form input:focus { outline: none; border-color: var(--accent); }
.auth-form .btn-primary { padding: 10px; }
.auth-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 12px;
  margin: 4px 0;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}
.auth-google {
  padding: 10px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
}
.auth-google:hover { background: var(--border); }
.auth-switch {
  font-size: 12px;
  color: var(--text-dim);
  text-align: center;
  margin-top: 6px;
}
.auth-switch a { color: var(--accent); cursor: pointer; }
.auth-error {
  color: var(--danger);
  font-size: 12px;
  text-align: center;
  margin-top: 4px;
  min-height: 16px;
}

/* ── Generic modal ───────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 95;
  background: var(--overlay);
  display: grid;
  place-items: center;
  padding: 20px;
}
.modal-backdrop[hidden] { display: none; }

.modal {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 100%;
  max-width: 440px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}
.modal-header {
  display: flex;
  align-items: center;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border);
}
.modal-title { font-size: 16px; font-weight: 600; flex: 1; }
.modal-close {
  width: 28px; height: 28px;
  background: transparent; border: none;
  color: var(--text-dim);
  border-radius: 6px;
  font-size: 18px;
}
.modal-close:hover { background: var(--bg-elev-2); color: var(--text); }

.modal-body {
  padding: 16px 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--border);
}

/* Folder pick list in modal */
.pick-folder {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 8px;
  background: var(--bg-elev-2);
  margin-bottom: 6px;
  cursor: pointer;
  font-size: 14px;
}
.pick-folder:hover { background: var(--border); }
.pick-folder.selected { background: var(--accent); color: #1a1a1a; }
.pick-folder .icon { font-size: 16px; }
.pick-folder .count { margin-left: auto; font-size: 11px; opacity: 0.7; }
.pick-subfolder {
  margin-left: 24px;
}

.modal-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev-2);
  color: var(--text);
  margin-top: 6px;
}

/* ── Selection action bar ──────────────── */
.selection-bar {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
}
.selection-bar[hidden] { display: none; }
.sel-count {
  font-weight: 600;
  font-size: 13px;
  margin-right: 4px;
}

/* ── Toast ───────────────────────────── */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 110;
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 13px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}
.toast.show { opacity: 1; }
.toast[hidden] { display: none; }

/* ── Footer ─────────────────────────── */
.site-footer {
  padding: 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

/* ── Mobile ─────────────────────────── */
@media (max-width: 720px) {
  .site-header { padding: 10px 12px; gap: 8px; }
  .brand-name { display: none; }
  .header-search { flex: 1; }
  .crumbs { display: none; }
  .app { padding: 24px 12px 60px; }
  .page-title { font-size: 22px; }
  .lightbox { padding: 50px 10px; }
  .lightbox-nav { width: 40px; height: 56px; font-size: 28px; }
  .lightbox-nav.prev { left: 6px; }
  .lightbox-nav.next { right: 6px; }
  .selection-bar { padding: 8px 10px; gap: 4px; }
  .selection-bar .btn-ghost, .selection-bar .btn-primary { padding: 6px 10px; font-size: 12px; }
}