:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --panel-2: #f7f8fa;
  --border: #e4e6eb;
  --text: #1a1d23;
  --muted: #767b87;
  --accent: #f38020;
  --accent-hover: #ff9040;
  --accent-soft: #fff3e8;
  --danger: #e5484d;
  --success: #30a46c;
  --shadow: 0 4px 14px rgba(0,0,0,0.06);
  --shadow-hover: 0 10px 30px rgba(0,0,0,0.12);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 14px; }
button, input, select { font-family: inherit; font-size: inherit; color: inherit; }
a { color: var(--accent); text-decoration: none; }
input, select { outline: none; }

/* topbar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #ff5a1f);
  display: grid; place-items: center; font-weight: 800; color: #fff;
}
.title { font-size: 16px; font-weight: 700; }
.subtitle { font-size: 12px; color: var(--muted); margin-top: 2px; }
.actions { display: flex; gap: 8px; align-items: center; }
.search {
  padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel-2); width: 240px;
}
.search:focus { border-color: var(--accent); background: #fff; }

/* buttons */
.btn {
  padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel); cursor: pointer; transition: 0.15s;
  color: var(--text);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hover); color: #fff; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--danger); border-color: var(--border); }
.btn.danger:hover { background: rgba(229,72,77,0.08); border-color: var(--danger); color: var(--danger); }
.btn.small { padding: 4px 8px; font-size: 12px; border-radius: 6px; }

/* crumbs */
.crumbs {
  padding: 10px 20px; background: var(--panel);
  border-bottom: 1px solid var(--border); font-size: 13px;
}
.crumbs .sep { margin: 0 8px; color: var(--muted); }
.crumbs a { color: var(--text); }
.crumbs a:hover { color: var(--accent); }

/* batch bar */
.batchbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px; background: var(--accent-soft); border-bottom: 1px solid var(--border);
  color: #7a3a10; font-weight: 600;
}
.batchbar-actions { display: flex; gap: 6px; }

/* content */
.content { padding: 20px; position: relative; min-height: calc(100vh - 130px); }
.dropzone {
  position: absolute; inset: 20px; border: 2px dashed transparent;
  border-radius: 12px; pointer-events: none; transition: 0.2s; z-index: 5;
  display: grid; place-items: center;
}
.dropzone.active { border-color: var(--accent); background: rgba(243,128,32,0.08); }
.dropzone.active .dz-inner { opacity: 1; }
.dz-inner { opacity: 0; text-align: center; transition: 0.2s; }
.dz-title { font-size: 18px; font-weight: 600; }
.dz-hint { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* grid — matches reference image */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 18px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: 0.15s;
  cursor: pointer;
  box-shadow: var(--shadow);
  position: relative;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.card.selected { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft), var(--shadow); }

.card .thumb {
  position: relative;
  aspect-ratio: 3 / 4;
  background: #000;
  display: grid; place-items: center;
  overflow: hidden;
}
.card .thumb img {
  width: 100%; height: 100%; object-fit: contain;
  background: #000;
}
.card.folder .thumb { background: linear-gradient(135deg, #fef3e6, #ffe0c2); aspect-ratio: 3 / 4; }
.card.folder .thumb .icon-lg { color: var(--accent); }
.card .thumb .icon-lg { font-size: 56px; opacity: 0.85; color: #fff; }
.card .thumb .badge {
  position: absolute; top: 8px; right: 8px; padding: 3px 8px;
  background: rgba(0,0,0,0.55); color: #fff; border-radius: 6px; font-size: 11px;
}
.card .thumb .badge.warn { background: #7a3a10; color: #ffcc88; }
.card .thumb .play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 42px; height: 42px; border-radius: 50%;
  background: rgba(0,0,0,0.55); color: #fff; display: grid; place-items: center;
  font-size: 16px; padding-left: 2px;
  transition: 0.15s;
}
.card:hover .thumb .play { background: rgba(243,128,32,0.9); }

/* checkbox at top-left of thumb */
.card .checkbox {
  position: absolute; top: 8px; left: 8px;
  width: 20px; height: 20px; border-radius: 4px;
  background: #fff; border: 1px solid #d0d3d9;
  display: grid; place-items: center;
  color: var(--accent); font-size: 14px; font-weight: 700;
  cursor: pointer; z-index: 2;
  transition: 0.1s;
}
.card .checkbox:hover { border-color: var(--accent); }
.card.selected .checkbox { background: var(--accent); border-color: var(--accent); color: #fff; }

/* tags at bottom-right of thumb */
.card .tags {
  position: absolute; bottom: 6px; right: 6px; z-index: 2;
  display: flex; flex-wrap: wrap; gap: 4px;
  justify-content: flex-end; max-width: 90%;
}
.tag-chip {
  display: inline-block; padding: 3px 8px; border-radius: 10px;
  background: rgba(243, 128, 32, 0.92); color: #fff;
  font-size: 11px; line-height: 1.2; font-weight: 500;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
.tag-chip.picker {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); cursor: pointer;
  padding: 6px 12px; font-size: 13px; border-radius: 16px;
  box-shadow: none;
}
.tag-chip.picker:hover { border-color: var(--accent); }
.tag-chip.picker.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.card .name {
  padding: 10px 12px 4px; font-size: 12px; text-align: center;
  color: var(--muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.card .row-actions {
  display: flex; gap: 2px; padding: 4px 8px 10px;
  justify-content: center;
}
.card .row-actions .btn.small { padding: 3px 7px; font-size: 12px; }

.loading, .empty, .error { text-align: center; padding: 40px; color: var(--muted); grid-column: 1/-1; }
.empty .hint { font-size: 12px; margin-top: 6px; }
.error { color: var(--danger); }

/* modal */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  display: grid; place-items: center; z-index: 100; padding: 20px;
}
.modal[hidden] {
  display: none !important;
}
.modal-card {
  width: 100%; max-width: 560px; max-height: 90vh; overflow: auto;
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}
.modal-card.small { max-width: 460px; }
.modal-head { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.modal-head h3 { margin: 0; font-size: 16px; }
.modal-head .close { padding: 2px 10px; font-size: 22px; line-height: 1; border: none; }
.modal-body { padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.modal-foot { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px; }
.modal-body label { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--muted); }
.modal-body input, .modal-body select {
  padding: 9px 12px; background: #fff; border: 1px solid var(--border);
  border-radius: 7px; color: var(--text);
}
.modal-body input:focus, .modal-body select:focus { border-color: var(--accent); }
.input-row { display: flex; gap: 6px; }
.input-row input, .input-row select { flex: 1; min-width: 0; }
.tip { font-size: 12px; color: var(--muted); background: var(--panel-2); padding: 10px 12px; border-radius: 6px; line-height: 1.5; }
.tip code { background: rgba(0,0,0,0.06); padding: 1px 4px; border-radius: 3px; }
.hint { color: var(--muted); font-size: 11px; }

.tag-picker { display: flex; flex-wrap: wrap; gap: 6px; min-height: 40px; padding: 8px; border: 1px dashed var(--border); border-radius: 8px; }

/* share preview */
.share-preview {
  background: #000; border-radius: 8px; overflow: hidden;
  display: grid; place-items: center; min-height: 160px; max-height: 360px;
}
.share-preview img, .share-preview video { max-width: 100%; max-height: 360px; }
.share-preview .preview-icon { font-size: 80px; opacity: 0.6; padding: 40px; color: #fff; }
.share-preview audio { width: 100%; padding: 20px; background: var(--panel); }

/* toast */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  background: #1a1d23; color: #fff;
  padding: 12px 22px; border-radius: 10px; z-index: 200;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

/* Upload panel — floating bottom-right */
.upload-panel {
  position: fixed; bottom: 20px; right: 20px; width: 380px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 20px 50px rgba(0,0,0,0.15);
  z-index: 150; overflow: hidden;
}
.up-head {
  padding: 10px 14px; background: var(--panel-2); border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center; font-weight: 600;
}
.up-list { max-height: 320px; overflow: auto; }
.up-row { padding: 10px 14px; border-bottom: 1px solid var(--border); }
.up-row.done { opacity: 0.65; }
.up-row.error { background: #fef2f2; }
.up-name { font-size: 12px; margin-bottom: 6px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.up-name small { color: var(--muted); margin-left: 6px; }
.up-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.up-fill { height: 100%; background: var(--accent); transition: width 0.2s; }
.up-row.done .up-fill { background: var(--success); }
.up-row.error .up-fill { background: var(--danger); }
.up-status { font-size: 11px; color: var(--muted); margin-top: 4px; }