:root{
  --bg:#f5f7fb; --surf:#ffffff; --ink:#0f172a; --muted:#64748b; --line:#e2e8f0;
  --brand:#1f3864; --accent:#2563eb; --accent2:#0d9488; --amber:#b26b00;
  --radius:14px; --shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.05);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.5}
a{color:inherit;text-decoration:none}

/* ---------- login ---------- */
.login-body{display:grid;place-items:center;min-height:100vh;background:radial-gradient(1200px 600px at 50% -10%,#e8eefb,transparent),var(--bg)}
.login-card{background:var(--surf);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:32px 30px;width:min(92vw,380px);display:flex;flex-direction:column;gap:8px}
.login-brand{font-weight:800;letter-spacing:.14em;color:var(--brand);font-size:22px}
.login-sub{color:var(--muted);font-size:13px;margin-bottom:14px}
.login-card label{font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.login-card input{border:1px solid var(--line);border-radius:10px;padding:11px 12px;font-size:15px;outline:none}
.login-card input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #2563eb22}
.login-card button{margin-top:10px;background:var(--brand);color:#fff;border:0;border-radius:10px;padding:11px;font-size:15px;font-weight:600;cursor:pointer}
.login-card button:hover{background:#17294a}
.login-err{background:#fdecea;border:1px solid #f5b5ad;color:#b03a2e;border-radius:9px;padding:8px 10px;font-size:13px}
.login-foot{color:var(--muted);font-size:12px;text-align:center;margin-top:8px}

/* ---------- shell ---------- */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;background:var(--surf);border-bottom:1px solid var(--line);padding:12px 18px}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;font-size:18px;line-height:1;padding:6px 10px;cursor:pointer}
.brand{font-weight:800;letter-spacing:.12em;color:var(--brand)}
.brand-sub{display:block;font-weight:500;letter-spacing:0;color:var(--muted);font-size:12px}
.logout{margin-left:auto;color:var(--muted);font-size:13px;border:1px solid var(--line);padding:6px 12px;border-radius:999px}
.logout:hover{color:var(--ink);border-color:#94a3b8}

.layout{display:grid;grid-template-columns:262px 1fr;min-height:calc(100vh - 57px)}
.sidebar{background:var(--surf);border-right:1px solid var(--line);padding:16px 12px;display:flex;flex-direction:column;gap:4px}
.tree{display:flex;flex-direction:column;gap:2px}
.tree .group>button{width:100%;text-align:left;background:none;border:0;cursor:pointer;font-weight:700;color:var(--ink);font-size:13.5px;padding:9px 10px;border-radius:9px;display:flex;align-items:center;gap:8px}
.tree .group>button:hover{background:#f1f5f9}
.tree .group .count{margin-left:auto;color:var(--muted);font-weight:600;font-size:12px}
.tree .items{display:flex;flex-direction:column;gap:1px;margin:2px 0 6px}
.tree .items button{width:100%;text-align:left;background:none;border:0;cursor:pointer;color:var(--muted);font-size:13px;padding:7px 10px 7px 30px;border-radius:8px}
.tree .items button:hover{background:#f1f5f9;color:var(--ink)}
.tree .items button.active{background:#e8eefb;color:var(--brand);font-weight:600}
.side-foot{margin-top:auto;color:var(--muted);font-size:11px;padding:10px}

.main{padding:22px 26px 60px}
.main-head{display:flex;align-items:center;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.main-head h1{font-size:20px;margin:0}
.search{margin-left:auto;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:14px;min-width:220px;outline:none}
.search:focus{border-color:var(--accent)}

.cards{display:flex;flex-direction:column;gap:8px;max-width:920px}
.li{display:flex;align-items:center;gap:14px;background:var(--surf);border:1px solid var(--line);border-radius:12px;padding:12px 14px;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.li:hover{border-color:#cbd5e1}
.li-ic{flex:none;width:34px;height:34px;display:grid;place-items:center;border-radius:8px}
.li-ic svg{width:22px;height:22px}
.li-ic.html{color:#2563eb;background:#eff4ff}.li-ic.docx{color:#1f3864;background:#eef1f8}.li-ic.xlsx{color:#0d9488;background:#e9f6f4}.li-ic.pdf{color:#b03a2e;background:#fdeeec}.li-ic.pptx{color:#c2410c;background:#fdf0e8}
.li-main{flex:1;min-width:0}
.li-title{font-weight:650;font-size:14.5px;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.li-meta{color:var(--muted);font-size:12px;display:flex;gap:10px;margin-top:2px}
.li-act{flex:none;display:flex;gap:8px}
.li-act .btn{flex:none;padding:7px 16px}
@media(max-width:640px){
  .li{flex-wrap:wrap}
  .li-main{flex:1 1 60%}
  .li-act{flex:1 1 100%;margin-top:8px}
  .li-act .btn{flex:1}
}
.empty{color:var(--muted);padding:40px;text-align:center}

@media(max-width:820px){
  .menu-btn{display:block}
  .layout{grid-template-columns:1fr}
  .sidebar{position:fixed;z-index:30;top:57px;bottom:0;left:0;width:260px;transform:translateX(-102%);transition:.2s;box-shadow:var(--shadow)}
  .sidebar.open{transform:none}
  .search{min-width:0;width:100%;margin-left:0}
}

/* ---------- language switcher ---------- */
.langsw{margin-left:auto;display:flex;gap:4px;background:#f1f5f9;border-radius:999px;padding:3px}
.lang-btn{border:0;background:none;cursor:pointer;font-size:12px;font-weight:700;color:var(--muted);padding:5px 10px;border-radius:999px}
.lang-btn.on{background:#fff;color:var(--brand);box-shadow:0 1px 2px rgba(0,0,0,.08)}
.topbar .logout{margin-left:14px}
.login-langs{display:flex;gap:8px;justify-content:flex-end;margin-bottom:2px}
.login-langs a{font-size:12px;font-weight:700;color:var(--muted);padding:3px 7px;border-radius:7px}
.login-langs a.on{background:#e8eefb;color:var(--brand)}

/* ---------- idle modal ---------- */
.modal-back{position:fixed;inset:0;background:rgba(15,23,42,.5);display:none;place-items:center;z-index:100}
.modal-back.show{display:grid}
.modal{background:#fff;border-radius:16px;box-shadow:var(--shadow);padding:26px 26px 22px;width:min(92vw,380px);text-align:center}
.modal-title{font-size:19px;font-weight:800;color:var(--brand);margin-bottom:8px}
.modal-body{color:var(--muted);font-size:14px;margin-bottom:14px}
.modal-count{font-size:14px;margin-bottom:16px}
.modal-count b{color:var(--brand);font-variant-numeric:tabular-nums}
.modal-yes{width:100%}