*,*::before,*::after{box-sizing:border-box}
:root{
    --primary:#4a6cf7; --primary-d:#3a5ce0;
    --bg:#f5f7fb; --card:#fff; --text:#2d3748; --muted:#718096;
    --border:#e2e8f0; --danger:#e53e3e; --success:#38a169;
}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.5}

/* === Auth === */
.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}
.auth-card{background:#fff;padding:36px 32px;border-radius:14px;box-shadow:0 10px 40px rgba(0,0,0,.08);width:100%;max-width:380px}
.auth-card h1{margin:0;font-size:20px}
.auth-card label{display:block;margin:14px 0 6px;font-size:13px;font-weight:600}
.auth-card input{width:100%;padding:10px 12px;border:1px solid #cbd5e0;border-radius:8px;font-size:14px}
.auth-card .btn{width:100%;margin-top:20px;padding:11px;font-size:14px}

/* === Topbar === */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.brand{font-weight:700;font-size:16px}
.topbar-right{display:flex;align-items:center;gap:12px}

/* === Layout === */
.layout{display:grid;grid-template-columns:240px 1fr;min-height:calc(100vh - 56px)}
.sidebar{background:#fff;border-right:1px solid var(--border);padding:18px 0;overflow-y:auto}
.side-section{padding:0 14px}
.side-title{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;padding:0 6px}
.folder-list{list-style:none;margin:0;padding:0}
.folder-list li{position:relative;display:flex;align-items:center;min-width:0}
.folder-list a{flex:1;min-width:0;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 12px;padding-right:28px;color:var(--text);text-decoration:none;border-radius:6px;font-size:14px}
.folder-list a:hover{background:#f1f5f9}
.folder-list a.active{background:#eef2ff;color:var(--primary);font-weight:600}
.folder-list .fname{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.folder-list .fcount{flex-shrink:0;background:#edf2f7;color:#4a5568;padding:1px 8px;border-radius:10px;font-size:11px}
.folder-list a.active .fcount{background:#dbe4ff}
.folder-edit{position:absolute;right:4px;top:50%;transform:translateY(-50%);opacity:0;background:#fff;border:none;cursor:pointer;padding:2px 6px;color:var(--muted);border-radius:4px;box-shadow:0 1px 3px rgba(0,0,0,.1)}
.folder-list li:hover .folder-edit{opacity:1}

/* === Main === */
.main{padding:22px 28px}
.toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;gap:12px}
.search{display:flex;gap:8px;flex:1;max-width:520px}
.search input{flex:1;padding:9px 12px;border:1px solid #cbd5e0;border-radius:8px;font-size:14px;background:#fff}
.empty{text-align:center;padding:80px 20px;color:var(--muted)}

/* === Grid === */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.card{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);transition:transform .15s,box-shadow .15s;position:relative}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,.08)}
.thumb{aspect-ratio:1/1;background:#f1f5f9;display:flex;align-items:center;justify-content:center;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb .icon{font-size:48px;opacity:.4}
.card .meta{padding:10px 12px}
.card .fname{font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-bottom:4px}
.card .info{display:flex;gap:6px;font-size:11px;color:var(--muted);flex-wrap:wrap}
.card .info span{background:#edf2f7;padding:1px 6px;border-radius:4px}
.card .info .folder-tag{background:#eef2ff;color:var(--primary)}
.card .tags{margin-top:6px;font-size:11px;color:var(--muted)}
.card .actions{position:absolute;top:6px;right:6px;display:flex;gap:4px;opacity:0;transition:opacity .15s}
.card:hover .actions{opacity:1}
.card .actions .icon-btn{background:rgba(255,255,255,.95);box-shadow:0 1px 4px rgba(0,0,0,.15);width:30px;height:30px;border-radius:6px}

/* === Buttons === */
.btn{display:inline-flex;align-items:center;justify-content:center;background:#fff;color:var(--text);border:1px solid var(--border);padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;text-decoration:none;font-family:inherit}
.btn:hover{background:#f7fafc}
.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn.primary:hover{background:var(--primary-d)}
.btn.ghost{background:transparent;border-color:transparent}
.btn.ghost:hover{background:#f1f5f9}
.btn.danger{background:var(--danger);color:#fff;border-color:var(--danger)}
.btn.danger:hover{background:#c53030}
.icon-btn{background:none;border:none;cursor:pointer;font-size:14px;padding:6px;border-radius:6px;color:var(--text)}
.icon-btn:hover{background:#edf2f7}

/* === Pagination === */
.pagination{display:flex;gap:6px;justify-content:center;margin:24px 0}
.pagination a{padding:7px 12px;border:1px solid var(--border);border-radius:6px;text-decoration:none;color:var(--text);font-size:13px;background:#fff}
.pagination a.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* === Modal === */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal[hidden]{display:none}
.modal-dialog{background:#fff;border-radius:12px;width:100%;max-width:560px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden}
.modal-dialog.small{max-width:420px}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border)}
.modal-head h2{margin:0;font-size:16px}
.modal-body{padding:20px;overflow-y:auto}
.modal-body label{display:block;margin:12px 0 6px;font-size:13px;font-weight:600}
.modal-body input[type=text],.modal-body select,.modal-body textarea{width:100%;padding:9px 12px;border:1px solid #cbd5e0;border-radius:8px;font-size:14px;font-family:inherit}
.modal-body textarea{min-height:80px;resize:vertical}
.modal-actions{display:flex;gap:8px;margin-top:20px;align-items:center}
.dropzone{margin-top:16px;border:2px dashed #cbd5e0;border-radius:10px;padding:32px;text-align:center;background:#f7fafc;transition:background .15s,border-color .15s}
.dropzone.drag{background:#eef2ff;border-color:var(--primary)}
.dropzone p{margin:0 0 10px;color:var(--muted);font-size:13px}
.upload-list{margin-top:14px;display:flex;flex-direction:column;gap:6px}
.upload-list .item{display:flex;align-items:center;gap:10px;padding:8px 10px;background:#f7fafc;border-radius:6px;font-size:12px}
.upload-list .item .name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.upload-list .item.ok{background:#f0fff4;color:var(--success)}
.upload-list .item.err{background:#fff5f5;color:var(--danger)}
.upload-list .url{display:flex;gap:6px;align-items:center;font-family:ui-monospace,Menlo,monospace;font-size:11px}
.upload-list .url input{flex:1;padding:4px 6px;font-size:11px;border:1px solid #cbd5e0;border-radius:4px;background:#fff}
.progress{height:4px;background:#e2e8f0;border-radius:2px;overflow:hidden;flex:1}
.progress > span{display:block;height:100%;background:var(--primary);transition:width .15s}

/* === Alerts / utilities === */
.alert{padding:10px 12px;border-radius:6px;font-size:13px;margin-bottom:10px}
.alert.error{background:#fff5f5;color:#c53030;border:1px solid #fed7d7}
.muted{color:var(--muted);font-size:12px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#2d3748;color:#fff;padding:10px 18px;border-radius:8px;font-size:13px;z-index:200;box-shadow:0 4px 12px rgba(0,0,0,.2);animation:toastIn .2s ease}
@keyframes toastIn{from{opacity:0;transform:translateX(-50%) translateY(8px)}to{opacity:1}}

/* === Responsive === */
@media (max-width: 768px) {
    .layout{grid-template-columns:1fr}
    .sidebar{display:none}
    .main{padding:16px}
}