:root{
  --bg:#f8fbff;
  --muted:#6b7280;
  --card:#ffffff;
  --accent:#0ea5e9;
  --dark:#0b1220;
  --danger:#dc2626;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;background:linear-gradient(180deg,#f8fbff 0%,#f3f6fb 100%);color:var(--dark)}

.container{max-width:1200px;margin:0 auto;padding:20px}

/* Topbar */
.topbar{padding:18px 0}
.topbar .container{display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{font-weight:700;font-size:1.4rem}
.controls{display:flex;align-items:center;gap:12px}

.search-wrap{position:relative}
#globalSearch{padding:10px 14px;border-radius:10px;border:1px solid rgba(2,6,23,0.06);min-width:260px}
.search-results{position:absolute;top:44px;left:0;background:var(--card);border-radius:8px;box-shadow:0 8px 30px rgba(2,6,23,0.06);width:320px;max-height:240px;overflow:auto;padding:6px;z-index:40}
.search-results.hidden{display:none}
.search-results .item{padding:8px;border-radius:6px;display:flex;align-items:center;gap:8px;cursor:pointer}
.search-results .item:hover{background:#f1f7ff}

/* Buttons */
.btn{padding:8px 12px;border-radius:8px;border:none;background:var(--accent);color:#fff;cursor:pointer}
.btn.ghost{background:#fff;border:1px solid rgba(2,6,23,0.06);color:var(--dark)}
.btn.red{background:var(--danger)}
.report-btn{position:fixed;right:22px;bottom:22px;background:var(--accent);color:#fff;border:none;border-radius:999px;padding:12px 18px;box-shadow:0 8px 30px rgba(14,165,233,0.15);display:flex;align-items:center;gap:8px;cursor:pointer}
.report-btn .label{display:inline-block}

/* Layout */
.main{display:flex;gap:18px;margin-top:12px}
.sidebar{width:260px}
.content{flex:1}

/* Topics list */
.topics-list{background:var(--card);border-radius:10px;padding:12px;box-shadow:0 6px 20px rgba(2,6,23,0.04)}
.topics-list .topic{padding:8px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:8px}
.topics-list .topic:hover{background:#f6fbff}

/* Tree */
.tree-root{background:var(--card);padding:18px;border-radius:12px;box-shadow:0 10px 30px rgba(2,6,23,0.06);min-height:400px}
ul.tree{list-style:none;padding-left:12px;margin:0}
li.node{margin:6px 0;display:flex;flex-direction:column}
.node-row{display:flex;align-items:center;gap:8px;padding:8px;border-radius:8px}
.node-row.folder{cursor:pointer}
.node-row.file{cursor:pointer}
.node-row .icon{width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px;background:#fff;border:1px solid rgba(2,6,23,0.04)}
.node-row .label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:520px}

/* Counters */
.badge{font-size:12px;color:var(--muted);padding:4px 8px;border-radius:999px;background:#fff;border:1px solid rgba(2,6,23,0.04)}

/* nested list collapsible */
ul.tree ul{margin-left:18px;border-left:1px dashed rgba(2,6,23,0.03);padding-left:12px}
.hidden{display:none}

/* Modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.35);z-index:80}
.modal-inner{background:var(--card);padding:18px;border-radius:12px;min-width:360px;max-width:520px;box-shadow:0 12px 40px rgba(2,6,23,0.12)}
.modal .row{display:flex;gap:8px;margin-top:8px}
.modal input, .modal textarea, .modal select{width:100%;padding:8px;border-radius:8px;border:1px solid rgba(2,6,23,0.06)}
.modal textarea{min-height:110px;resize:vertical}
.status{margin-top:8px;font-size:0.9rem}

/* Responsive */
@media (max-width:900px){
  .main{flex-direction:column}
  .sidebar{width:100%}
  .node-row .label{max-width:260px}
  #globalSearch{min-width:160px}
}