:root{
  --blue:#1D49A7; --ink:#15161c; --mute:#5b5a68; --line:#e6e5ea; --paper:#fafafa; --bad:#c0392b; --good:#1a7f37;
  box-sizing:border-box;
}
*{box-sizing:inherit;margin:0;padding:0}
body{font-family:-apple-system,"Segoe UI",Inter,sans-serif;background:#fff;color:var(--ink);font-size:16px;line-height:1.5}

/* ---------- auth screens ---------- */
.auth-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--paper)}
.auth-box{width:100%;max-width:360px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:32px}
.auth-box h1{font-size:1.3rem;margin-bottom:6px}
.auth-sub{color:var(--mute);font-size:.88rem;margin-bottom:20px}
.auth-box input{width:100%;padding:12px 14px;border:1px solid #ccc;border-radius:8px;font-size:.95rem;margin-bottom:12px}
.auth-box button{width:100%;padding:12px;border:none;border-radius:8px;background:var(--blue);color:#fff;font-weight:600;font-size:.95rem;cursor:pointer}
.auth-error{color:var(--bad);font-size:.85rem;margin-top:10px;min-height:1em}
.auth-success{color:var(--good);font-size:.85rem;margin-top:10px}

/* ---------- app shell ---------- */
.app{display:flex;min-height:100vh}
.sidebar{width:230px;flex-shrink:0;background:var(--ink);color:#fff;display:flex;flex-direction:column;padding:24px 16px;position:sticky;top:0;height:100vh}
.sidebar .brand{font-weight:700;font-size:1.05rem;margin-bottom:28px;padding:0 6px}
.tabs{display:flex;flex-direction:column;gap:4px;flex:1}
.tab-btn{text-align:left;background:none;border:none;color:rgba(255,255,255,.7);padding:11px 12px;border-radius:8px;font-size:.92rem;cursor:pointer}
.tab-btn:hover{background:rgba(255,255,255,.06);color:#fff}
.tab-btn.active{background:var(--blue);color:#fff}
.sidebar-foot{border-top:1px solid rgba(255,255,255,.12);padding-top:16px;margin-top:16px}
.sidebar-foot .me{font-size:.8rem;color:rgba(255,255,255,.6);margin-bottom:10px}
.sidebar-foot .me strong{color:#fff}
.logout-btn{width:100%;padding:9px;border:1px solid rgba(255,255,255,.25);background:none;color:#fff;border-radius:8px;cursor:pointer;font-size:.85rem}
.logout-btn:hover{background:rgba(255,255,255,.08)}

.content{flex:1;padding:36px 40px;max-width:720px}
.content h2{font-size:1.15rem;margin-bottom:16px}
.tab-pane{display:none}
.tab-pane.active{display:block}

/* ---------- tasks ---------- */
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.chip{border:1px solid #ddd;background:#fff;border-radius:999px;padding:6px 14px;font-size:.82rem;cursor:pointer;color:#555}
.chip-active{background:var(--blue);border-color:var(--blue);color:#fff}
.tasks{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.task{display:flex;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:var(--paper);gap:10px}
.task label{display:flex;align-items:center;gap:10px;cursor:pointer;min-width:0}
.task label span{overflow-wrap:anywhere}
.task.done span{text-decoration:line-through;color:#999}
.task-right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.badge{background:#e8edfb;color:var(--blue);font-size:.76rem;font-weight:600;padding:4px 10px;border-radius:999px;white-space:nowrap}
.tlink{text-decoration:none;font-size:1rem}
.del{border:none;background:none;color:#aaa;font-size:1rem;cursor:pointer}
.del:hover{color:var(--bad)}
.empty{color:#888;font-size:.9rem}

.add-form{display:flex;flex-wrap:wrap;gap:8px}
.add-form input, .add-form select{flex:1;min-width:140px;padding:11px 12px;border:1px solid #ccc;border-radius:8px;font-size:.95rem}
.add-form button{padding:11px 18px;border:none;border-radius:8px;background:var(--blue);color:#fff;font-weight:600;cursor:pointer}
.add-form-col{flex-direction:column}
.add-form-col input, .add-form-col select{width:100%}

/* ---------- users tab ---------- */
.user-list{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
.user-row{display:flex;justify-content:space-between;border:1px solid var(--line);border-radius:8px;padding:10px 14px;background:var(--paper);font-size:.92rem}
.role-tag{color:var(--mute);font-size:.82rem}

/* ---------- responsive: sidebar becomes a top bar ---------- */
@media (max-width:760px){
  .app{flex-direction:column}
  .sidebar{width:100%;height:auto;position:static;flex-direction:row;align-items:center;padding:14px 16px;gap:16px}
  .sidebar .brand{margin-bottom:0}
  .tabs{flex-direction:row;flex:1;overflow-x:auto}
  .sidebar-foot{border-top:none;margin-top:0;padding-top:0;display:flex;align-items:center;gap:10px}
  .sidebar-foot .me{margin-bottom:0;white-space:nowrap}
  .logout-btn{width:auto;padding:8px 12px}
  .content{padding:24px 18px}
}