body {
  background: linear-gradient(135deg, #e3e9ff 0%, #f8f9fa 100%);
  min-height: 100vh;
  font-family: 'Segoe UI', Arial, sans-serif;
}

.container-fluid {
  padding-left: 0;
  padding-right: 0;
}

/* Sidebar */
.sidebar {
  background: linear-gradient(180deg, #f5f6fa 80%, #e3e9ff 100%);
  border-right: 1px solid #e0e0e0;
  box-shadow: 2px 0 8px rgba(90, 141, 238, 0.04);
  padding-top: 2rem;
  min-height: 100vh;
}
.sidebar .nav-link {
  color: #333;
  margin-bottom: 0.5rem;
  font-size: 1.08rem;
  padding: 0.7rem 1rem;
  border-radius: 0.375rem;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.sidebar .nav-link.active, .sidebar .nav-link:hover {
  background: linear-gradient(90deg, #e3e7fd 60%, #c7d2fe 100%);
  color: #0d6efd !important;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(13, 110, 253, 0.08);
}

/* Main Content */
main {
  padding: 2rem 2rem 2rem 2.5rem;
  min-height: calc(100vh - 56px);
  background: transparent;
}

/* Responsive Tweaks */
@media (max-width: 1199.98px) {
  main {
    padding: 1.5rem 1rem 1.5rem 1rem;
  }
}
@media (max-width: 991.98px) {
  .sidebar {
    min-height: auto;
    box-shadow: none;
    border-right: none;
    border-bottom: 1px solid #e0e0e0;
    padding-top: 0.5rem;
  }
  main {
    padding: 1rem;
  }
}
@media (max-width: 767.98px) {
  .container-fluid, .row {
    padding-left: 0 !important;
    padding-right: 0 !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
  }
  .sidebar {
    min-height: auto;
    box-shadow: none;
    border-right: none;
    border-bottom: 1px solid #e0e0e0;
    padding-top: 0.5rem;
    width: 100%;
  }
  main {
    padding: 0.5rem;
  }
  .card {
    border-radius: 1rem;
    margin-bottom: 1rem;
  }
  #fullCalendar {
    padding: 0.2rem;
    border-radius: 0.5rem;
  }
  .table-responsive {
    overflow-x: auto;
  }
  .table {
    font-size: 0.95rem;
    min-width: 600px;
  }
  .modal-dialog {
    margin: 1rem auto;
    max-width: 95vw;
  }
}
/* iPhone SE, 12/13 Mini, 14/15 Pro (320px-390px) */
@media (max-width: 430px) {
  html, body {
    font-size: 15px;
    overflow-x: hidden;
  }
  .navbar-brand {
    font-size: 1rem;
  }
  .sidebar {
    padding-top: 0.5rem;
    font-size: 0.98rem;
  }
  main {
    padding: 0.3rem;
  }
  .card {
    padding: 0.4rem;
    border-radius: 0.6rem;
  }
  .table {
    font-size: 0.90rem;
    min-width: 400px;
  }
  .modal-content {
    border-radius: 0.4rem;
    padding: 0.3rem;
  }
  .form-control {
    font-size: 0.98rem;
    padding: 0.3rem 0.5rem;
  }
  .btn {
    font-size: 0.98rem;
    padding: 0.3rem 0.5rem;
  }
  #fullCalendar {
    padding: 0.1rem;
    border-radius: 0.3rem;
  }
  .alert {
    font-size: 0.95rem;
    padding: 0.4rem 0.6rem;
  }
}
@media (max-width: 350px) {
  html, body {
    font-size: 13px;
  }
  .table {
    min-width: 320px;
  }
}

/* Cards & Stats */
.card {
  border: none;
  border-radius: 1rem;
  box-shadow: 0 4px 24px rgba(90, 141, 238, 0.10);
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: 0 8px 32px rgba(90, 141, 238, 0.18);
  transform: translateY(-2px) scale(1.01);
}

/* Table */
.table {
  background: #fff;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(90, 141, 238, 0.04);
}
.table th, .table td {
  vertical-align: middle;
}

/* Calendar */
#fullCalendar {
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 4px 24px rgba(90, 141, 238, 0.10);
  padding: 1rem;
  margin-bottom: 2rem;
}

/* Modals */
.modal-content {
  border-radius: 1rem;
  box-shadow: 0 8px 32px rgba(90, 141, 238, 0.18);
}

/* Forms */
.form-control {
  border-radius: 0.75rem;
  box-shadow: 0 2px 8px rgba(90, 141, 238, 0.04);
  border: 1px solid #c7d2fe;
  transition: border 0.2s, box-shadow 0.2s;
}
.form-control:focus {
  border-color: #5a8dee;
  box-shadow: 0 4px 16px rgba(90, 141, 238, 0.12);
}

.btn {
  transition: box-shadow 0.2s, background 0.2s, color 0.2s;
  box-shadow: 0 2px 8px rgba(13, 110, 253, 0.04);
  border-radius: 0.75rem;
}
.btn:hover, .btn:focus {
  box-shadow: 0 4px 16px rgba(13, 110, 253, 0.12);
  outline: none;
}

/* Navbar */
.navbar {
  box-shadow: 0 2px 8px rgba(13, 110, 253, 0.08);
  background: linear-gradient(90deg, #0d6efd 60%, #5a8dee 100%);
}
.navbar-brand {
  font-weight: bold;
  letter-spacing: 1px;
  font-size: 1.6rem;
  color: #fff !important;
  text-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* Alerts */
#taskAlert {
  z-index: 2000;
  min-width: 200px;
}