html:has(#study-upload-dialog[open]),html:has(#study-upload-delete-dialog[open]),html:has(#study-upload-preview-dialog[open]){overflow:hidden}
#study-upload-dialog{width:min(1080px,96%);height:94%;max-width:none;max-height:94%;padding:0;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:var(--bg);color:var(--ink)}
#study-upload-dialog::backdrop,#study-upload-delete-dialog::backdrop,#study-upload-preview-dialog::backdrop{background:#14233177;backdrop-filter:blur(4px)}
#study-upload-preview-dialog{width:min(1180px,96%);height:94%;max-width:none;max-height:94%;padding:0;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:var(--bg);color:var(--ink)}
.upload-preview-shell{display:flex;height:100%;min-height:0;flex-direction:column}.upload-preview-body{flex:1;min-height:0;overflow:auto}
.upload-shell{display:flex;height:100%;min-height:0;flex-direction:column}
.upload-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:24px;border-bottom:1px solid var(--line);background:#ffffffe0}
.upload-header h2{margin:6px 0 0;font-size:21px}
.upload-toolbar{display:flex;align-items:end;justify-content:space-between;gap:18px;padding:16px 24px;border-bottom:1px solid var(--line)}
.upload-toolbar>label,.upload-form-grid label,.upload-note-label,.upload-library-tools label{display:grid;gap:7px;color:var(--muted);font-size:12px}
.upload-toolbar select,.upload-form-grid input,.upload-form-grid select,.upload-note-label textarea,.upload-library-tools input{min-width:0;border:1px solid var(--line);border-radius:8px;background:#fff;padding:10px 12px;color:var(--ink);font:inherit;font-size:13px}
.upload-toolbar>label{min-width:min(330px,46%)}
.upload-tabs{display:flex;gap:5px;padding:4px;border:1px solid var(--line);border-radius:10px;background:#fff8}
.upload-tabs .tab{border:0;border-radius:7px;padding:9px 13px}
.upload-tabs .tab span{margin-left:5px;color:inherit;font-size:10px;opacity:.65}
.upload-body{min-height:0;flex:1;overflow:auto;padding:24px}
.upload-form{display:grid;max-width:820px;margin:0 auto;gap:18px}
.upload-form-grid{display:grid;gap:14px;grid-template-columns:minmax(160px,.45fr) minmax(240px,1fr)}
.upload-note-label textarea{min-height:74px;resize:vertical;line-height:1.65}
.upload-dropzone{display:grid;place-items:center;gap:7px;min-height:185px;width:100%;border:1.5px dashed #9ca8b3;border-radius:15px;background:linear-gradient(145deg,#ffffffc7,#edf1f599);padding:24px;color:var(--ink);font:inherit;cursor:pointer;transition:border-color .18s ease,background .18s ease,transform .18s ease}
.upload-dropzone:hover,.upload-dropzone.dragging{border-color:var(--accent);background:#fff;transform:translateY(-1px)}
.upload-dropzone:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.upload-dropzone small{color:var(--muted);font-size:11px;line-height:1.7;text-align:center}
.upload-drop-icon{display:grid;width:42px;height:42px;place-items:center;border:1px solid var(--line);border-radius:50%;background:#fff;color:var(--accent);font-size:24px;font-weight:300}
.upload-queue{display:grid;gap:8px}.upload-queue-empty{padding:16px;border:1px solid var(--line);border-radius:10px;color:var(--muted);font-size:12px;text-align:center}
.upload-queue-item{display:grid;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:11px;background:#fff9;grid-template-columns:auto 1fr auto}
.upload-queue-item>div:nth-child(2){min-width:0}.upload-queue-item strong,.upload-queue-item span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.upload-queue-item strong{font-size:13px;font-weight:550}.upload-queue-item span{margin-top:4px;color:var(--muted);font-size:11px}
.upload-file-icon{display:grid;width:42px;height:42px;place-items:center;border-radius:8px;background:#e9edf1;color:var(--accent);font-size:9px;font-weight:650;letter-spacing:.04em}
.upload-submit-row{display:flex;align-items:center;gap:14px;min-height:42px}.upload-submit-row .hint{line-height:1.6}
.upload-empty{display:grid;min-height:320px;place-items:center;align-content:center;gap:12px;padding:30px;text-align:center}.upload-empty.compact{min-height:240px}.upload-empty h3{margin:0;font-size:19px}.upload-empty p{max-width:540px;margin:0;color:var(--muted);font-size:13px;line-height:1.8}.upload-empty .room-actions{justify-content:center}
.upload-lock{border:1px solid var(--line);border-radius:999px;padding:8px 12px;color:var(--accent);font-size:10px;letter-spacing:.16em}
.upload-spinner{width:28px;height:28px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:upload-spin .8s linear infinite}
@keyframes upload-spin{to{transform:rotate(360deg)}}
.upload-library{display:grid;gap:14px}.upload-library-tools{display:flex;align-items:end;gap:12px}.upload-library-tools label{flex:1}.upload-library-tools input{width:100%}
.upload-cloud-grid{display:grid;gap:14px;grid-template-columns:repeat(3,minmax(0,1fr))}
.upload-cloud-item{min-width:0;overflow:hidden;border:1px solid var(--line);border-radius:14px;background:#fff9}
.upload-cloud-item>img,.upload-file-cover{display:block;width:100%;aspect-ratio:4/3;background:#e6ebef;object-fit:cover}
.upload-file-cover{display:grid;place-items:center;background:linear-gradient(145deg,#edf1f5,#dfe5eb)}.upload-file-cover span{display:grid;width:74px;aspect-ratio:.78;place-items:center;border:1px solid #aab4bd;border-radius:7px;background:#fff;color:var(--accent);font-size:11px;font-weight:650;box-shadow:0 10px 25px #14233112}
.upload-cloud-body{display:grid;gap:7px;padding:15px}.upload-cloud-body h3{margin:0;overflow-wrap:anywhere;font-size:14px;line-height:1.5}.upload-cloud-body p{margin:0;color:var(--muted);font-size:12px;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere}.upload-cloud-body small{color:var(--muted);font-size:10px}.upload-cloud-body .room-actions{margin-top:6px}.upload-original-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap!important}.upload-delete-link{margin-left:auto;color:#9f3047}
#study-upload-delete-dialog{width:min(460px,92%);max-width:none;padding:0;border:1px solid var(--line);border-radius:16px;background:var(--bg);color:var(--ink)}
.upload-delete-card{display:grid;gap:14px;padding:25px}.upload-delete-card h2{margin:0;font-size:20px}.upload-delete-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.75;overflow-wrap:anywhere}.upload-delete-card p strong{color:var(--ink)}.upload-delete-card .room-actions{justify-content:flex-end;margin-top:5px}.upload-danger{background:#8b263c}.upload-danger:hover{background:#751f32}
@media(max-width:860px){.upload-cloud-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){#study-upload-dialog{width:100%;height:100%;max-height:100%;margin:0;border:0;border-radius:0;inset:0}.upload-header{align-items:flex-start;padding:16px}.upload-header h2{font-size:17px}.upload-toolbar{align-items:stretch;flex-direction:column;padding:13px 16px}.upload-toolbar>label{min-width:0;width:100%}.upload-tabs{width:100%}.upload-tabs .tab{flex:1}.upload-body{padding:16px}.upload-form-grid{grid-template-columns:1fr}.upload-dropzone{min-height:150px}.upload-cloud-grid{grid-template-columns:1fr}.upload-library-tools{align-items:stretch;flex-direction:column}.upload-library-tools .button{width:100%}.upload-submit-row{align-items:stretch;flex-direction:column}.upload-submit-row .button{width:100%}.upload-queue-item{grid-template-columns:auto minmax(0,1fr) auto}}
@media(max-width:650px){#study-upload-preview-dialog{width:100%;height:100%;max-height:100%;margin:0;border:0;border-radius:0;inset:0}}
@media(prefers-reduced-motion:reduce){.upload-spinner{animation-duration:1.8s}.upload-dropzone{transition:none}}