:root{
--bg:#0b1220; --bg-soft:#0f172a; --card:#111827; --card-2:#0b1220; --line:#1f2937;
--text:#e5e7eb; --muted:#94a3b8; --brand:#22d3ee; --brand-2:#38bdf8; --accent:#22c55e; --danger:#ef4444; --warn:#f59e0b;
--radius:16px; --radius-sm:12px; --shadow:0 10px 30px rgba(0,0,0,.25);
}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,Segoe UI,Roboto,Arial;background:linear-gradient(180deg,var(--bg),var(--bg-soft));color:var(--text)}


/* Topbar + Shell */
.topbar{position:sticky;top:0;background:rgba(17,24,39,.85);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:10px 16px;z-index:20}
.brand{font-weight:800;letter-spacing:.3px}
.shell{display:grid;grid-template-columns:260px 1fr;min-height:calc(100vh - 52px)}
.sidebar{border-right:1px solid var(--line);background:rgba(11,18,32,.7)}
.sidebar h3{padding:16px;color:var(--muted);font-size:.9rem;text-transform:uppercase;letter-spacing:.1em;margin:0}
.nav{display:grid;gap:8px;padding:8px 12px 24px}
.nav a{display:flex;gap:10px;align-items:center;padding:10px 12px;border-radius:12px;color:var(--text);text-decoration:none;border:1px solid transparent}
.nav a:hover{background:rgba(56,189,248,.08);border-color:rgba(56,189,248,.2)}
.nav .icon{font-size:18px}


/* Panels */
.main{padding:18px}
.card{background:linear-gradient(180deg,rgba(17,24,39,.9),rgba(11,18,32,.9));border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.card.pad{padding:16px}
.grid{display:grid;gap:16px}


/* Tiles */
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.tile{display:flex;gap:12px;align-items:center;background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:14px;padding:14px;text-decoration:none;color:var(--text);transition:transform .15s ease, border-color .15s ease}
.tile:hover{transform:translateY(-2px);border-color:rgba(56,189,248,.35)}
.tile .ico{width:34px;height:34px;display:grid;place-items:center;border-radius:12px;background:rgba(56,189,248,.1);border:1px solid rgba(56,189,248,.25)}
.tile .title{font-weight:600}


/* File manager */
.fm-head{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-bottom:12px}
.crumbs{display:flex;flex-wrap:wrap;gap:6px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--text)}
.actions{display:flex;gap:8px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.03);color:var(--text);text-decoration:none;cursor:pointer}
.btn.primary{background:linear-gradient(180deg,var(--brand),var(--brand-2));color:#081018;border-color:transparent;font-weight:700}
.btn.ghost{background:transparent}
.btn.warn{background:rgba(245,158,11,.12);border-color:rgba(245,158,11,.3)}
.btn.danger{background:rgba(239,68,68,.12);border-color:rgba(239,68,68,.35)}
.btn.xs{padding:6px 10px;border-radius:10px;font-size:.9rem}
.hint{color:var(--muted);font-size:.9rem}


.uploader{border:1px dashed rgba(56,189,248,.35);border-radius:14px;padding:16px;text-align:center;background:rgba(56,189,248,.05)}
.uploader input[type=file]{display:block;margin:8px auto}


.list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.row{display:grid;grid-template-columns:1fr auto auto;gap:12px;align-items:center;background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:12px;padding:10px}
.row .name{display:flex;align-items:center;gap:10px}
.row .meta{color:var(--muted);font-size:.85rem}


/* Editor */
.editor{display:grid;gap:12px}
#code{min-height:65vh;background:#0b1220;color:#e5e7eb;border:1px solid var(--line);border-radius:12px;padding:12px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.55}
.preview{max-width:100%;height:auto;border-radius:12px}
.pdf{width:100%;height:80vh;border:none;border-radius:12px}


/* FAB Action Drawer */
.fab{position:fixed;right:18px;bottom:18px;z-index:30}
.fab .menu{display:none;position:absolute;right:0;bottom:56px;display:grid;gap:8px}
.pdf{width:100%;height:80vh;border:none;border-radius:12px}