*{box-sizing:border-box}
:root{
  --bg:#071426;
  --card:#0f2238;
  --card-alt:#132a44;
  --text:#f8fafc;
  --muted:#9fb3c8;
  --primary:#2563eb;
  --primary2:#0284c7;
  --cyan:#38bdf8;
  --buttonText:#ffffff;
  --danger:#dd3344;
  --success:#00c874;
  --border:rgba(255,255,255,.08);
}
.light{
  --bg:#f3f7ff;
  --card:#ffffff;
  --card-alt:#f0f5ff;
  --text:#0f172a;
  --muted:#5b6b82;
  --primary:#2563eb;
  --cyan:#60a5fa;
  --buttonText:#ffffff;
  --border:rgba(15,23,42,.08);
}
body{margin:0;background:var(--bg);color:var(--text);font-family:'Segoe UI',Inter,Arial,sans-serif;transition:background .3s,color .3s;}
.app{max-width:540px;margin:auto;padding:18px;}

.top{display:flex;justify-content:space-between;align-items:center;gap:8px;}
.top h1{font-size:22px;letter-spacing:.2px;margin:0;}
.top-actions{display:flex;align-items:center;gap:8px;}

button{
  background:linear-gradient(135deg,var(--primary),var(--primary2));
  color:var(--buttonText);
  box-shadow:0 6px 16px rgba(37,99,235,.25);
  border:0;border-radius:14px;padding:12px;font-weight:600;
  cursor:pointer;transition:transform .15s ease, box-shadow .15s ease, opacity .15s ease;
}
button:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(37,99,235,.32);}
button:active{transform:translateY(0);}

nav{display:flex;gap:10px;position:sticky;top:0;padding:10px 0;background:var(--bg);z-index:100;}
nav button{flex:1;background:var(--card);color:var(--text);box-shadow:none;border:1px solid var(--border);}
nav button:hover{box-shadow:0 4px 12px rgba(0,0,0,.15);}

.card,.stats div{background:var(--card);border-radius:22px;padding:18px;margin:15px 0;box-shadow:0 8px 24px rgba(0,0,0,.18);border:1px solid var(--border);}
.card h2{margin-top:0;font-size:17px;}
.stats{display:flex;gap:10px;}
.stats div{flex:1;text-align:center;padding:14px 8px;}
.stats b{font-size:18px;}
small{display:block;opacity:.7;color:var(--muted);margin-top:2px;}

input,select,textarea{
  width:100%;padding:12px 13px;margin:6px 0;border-radius:14px;
  border:1px solid var(--border);background:var(--card-alt);color:var(--text);
  font-size:14px;transition:border .15s ease;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--cyan);}
textarea{height:90px;resize:vertical;}

input[type="checkbox"]{width:20px !important;height:20px !important;padding:0;margin:0;cursor:pointer;flex-shrink:0;accent-color:var(--primary);}

/* Tasks */
.task, .note{
  background:var(--card-alt);
  padding:12px;border-radius:14px;margin:8px 0;
  display:flex;flex-direction:row;align-items:center;justify-content:space-between;gap:10px;
  border:1px solid var(--border);transition:box-shadow .15s ease;
}
.task.active-task{border-color:var(--cyan);box-shadow:0 0 0 2px rgba(56,189,248,.2);}
.task-info{display:flex;flex-direction:column;flex:1;text-align:left;word-break:break-word;}
.task-name{font-size:15px;font-weight:600;margin-bottom:3px;display:flex;align-items:center;flex-wrap:wrap;gap:4px;}
.task-meta{font-size:12px;opacity:.85;color:var(--muted);line-height:1.5;}
.done{text-decoration:line-through;opacity:.5;}

.actions{display:flex;flex-direction:row;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end;}
.actions button{padding:6px 10px;font-size:12px;border-radius:8px;box-shadow:none;}
.edit{background:#00aa55;}
.delete{background:var(--danger);}

.hide{display:none !important;}
footer{text-align:center;padding:12px 5px;margin-top:20px;opacity:.6;font-size:12px;}
.task-list-space{margin-bottom:10px;min-height:0;}
.action-buttons{display:flex;gap:10px;margin-top:12px;margin-bottom:12px;}
.action-buttons button{flex:1;margin:0;}

/* Due date / time row */
.due-row{display:flex;gap:10px;}
.due-row input{flex:1;}

/* Start / End timer buttons */
.start-btn{background:var(--success);padding:6px 10px;font-size:12px;border-radius:8px;box-shadow:none;}
.end-btn{background:var(--danger);padding:6px 10px;font-size:12px;border-radius:8px;box-shadow:none;}
.time-spent{font-size:12px;opacity:.85;margin-right:6px;white-space:nowrap;color:var(--muted);}

/* Countdown */
.countdown{color:var(--cyan);}
.overdue{color:var(--danger);font-weight:bold;}

/* Priority badges */
.priority-high{background:var(--danger);color:#fff;font-size:10px;padding:2px 7px;border-radius:6px;}
.priority-medium{background:#f59e0b;color:#fff;font-size:10px;padding:2px 7px;border-radius:6px;}
.priority-low{background:var(--success);color:#fff;font-size:10px;padding:2px 7px;border-radius:6px;}

/* Filter bar */
.filter-bar{display:flex;gap:8px;margin:12px 0;flex-wrap:wrap;align-items:center;}
.filter-btn{background:transparent;color:var(--text);box-shadow:none;padding:7px 14px;font-size:12px;border-radius:20px;border:1px solid var(--border);}
.filter-btn.active{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;border:0;}
#categoryFilter{width:auto;flex:1;min-width:140px;margin:0;padding:9px 12px;font-size:12px;}

/* Empty state */
.empty-state{text-align:center;padding:26px 10px;opacity:.6;font-size:13px;}

/* Notification center */
.notif-wrap{position:relative;}
.notif-badge{position:absolute;top:-4px;right:-4px;background:var(--danger);color:#fff;font-size:10px;
  border-radius:50%;min-width:16px;height:16px;display:none;align-items:center;justify-content:center;padding:0 3px;}
.notif-dropdown{
  position:absolute;top:115%;right:0;width:280px;max-height:320px;overflow-y:auto;
  background:var(--card);border-radius:16px;padding:12px;box-shadow:0 12px 30px rgba(0,0,0,.35);
  border:1px solid var(--border);z-index:500;
}
.notif-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.link-btn{background:none;box-shadow:none;color:var(--cyan);padding:0;font-size:12px;font-weight:600;}
.notif-item{padding:8px;border-radius:10px;background:var(--card-alt);margin-bottom:6px;font-size:12px;line-height:1.4;}
.notif-item small{opacity:.6;display:block;margin-top:3px;}
.notif-empty{font-size:13px;opacity:.6;text-align:center;padding:14px 0;}

/* Modals */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:2000;padding:20px;}
.modal-box{background:var(--card);border-radius:20px;padding:20px;max-width:420px;width:100%;max-height:85vh;overflow-y:auto;border:1px solid var(--border);}
.modal-box h3{margin-top:0;}
.modal-actions{display:flex;gap:10px;margin-top:14px;}
.modal-actions button{flex:1;margin:0;}
.btn-secondary{background:transparent;color:var(--text);box-shadow:none;border:1px solid var(--border);}
.btn-danger{background:var(--danger);box-shadow:none;}

/* Toasts */
.toast-container{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;gap:8px;z-index:3000;align-items:center;}
.toast{
  background:var(--card);color:var(--text);padding:11px 18px;border-radius:12px;
  box-shadow:0 10px 24px rgba(0,0,0,.35);font-size:13px;border:1px solid var(--border);
  opacity:0;transform:translateY(10px);
  animation:toastIn .25s forwards, toastOut .25s forwards 2.6s;
}
@keyframes toastIn{to{opacity:1;transform:translateY(0);}}
@keyframes toastOut{to{opacity:0;transform:translateY(-8px);}}

.saved-note{font-size:12px;opacity:.6;margin-top:6px;min-height:14px;}

/* Update banner */
.update-banner{
  position:fixed;top:0;left:0;right:0;z-index:4000;
  background:linear-gradient(135deg,var(--primary),var(--primary2));
  color:#fff;padding:12px 16px;
  display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;
  box-shadow:0 6px 18px rgba(0,0,0,.3);
  animation:slideDown .3s ease;
  font-size:14px;
}
.update-banner button{
  background:#fff;color:var(--primary);padding:7px 16px;border-radius:10px;
  font-size:13px;box-shadow:none;
}
@keyframes slideDown{from{transform:translateY(-100%);}to{transform:translateY(0);}}