:root {
    --primary-color: #005A9C;
    --secondary-color: #FDB813;
    --background-color: #f4f6f8;
    --text-color: #333;
    --card-bg: #fff;
    --shadow: 0 4px 8px rgba(0,0,0,0.1);
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --gray-color: #6c757d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 1rem;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

nav a.active, nav a:hover {
    border-bottom-color: var(--secondary-color);
}

.controls {
    display: flex;
    align-items: center;
}

.admin-toggle {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}

.admin-toggle label {
    margin-right: 10px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--secondary-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}


main {
    padding: 2rem;
}

.view {
    display: none;
}
.view.active {
    display: block;
}

/* Toolbar & Filters */
.toolbar {
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.search-container {
    position: relative;
    flex-grow: 1;
}

.search-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-color);
}

#search-bar {
    width: 100%;
    padding: 0.75rem 0.75rem 0.75rem 40px;
    border-radius: 30px;
    border: 1px solid #ddd;
    font-size: 1rem;
}

#category-filters-container {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

#category-filters-container button {
    background-color: var(--card-bg);
    border: 1px solid #ddd;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}

#category-filters-container button:hover {
    background-color: #e9e9e9;
}

#category-filters-container button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

#category-filters-container button#add-category-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
    font-weight: bold;
}

/* Item Grid & Cards */
.item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.item-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: transform 0.2s;
}

.item-card:hover {
    transform: translateY(-5px);
}

.item-card.not-available {
    opacity: 0.6;
}

.item-card .card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background-color: #e0e0e0;
}

.card-body {
    padding: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    margin: 0 0 0.5rem 0;
    font-size: 1.2rem;
}

.card-status {
    padding: 0.25rem 0.5rem;
    border-radius: 5px;
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
    align-self: flex-start;
    margin-bottom: 1rem;
}

.card-status.available { background-color: var(--success-color); }
.card-status.not-available { background-color: var(--danger-color); }

.card-actions {
    margin-top: auto;
}

.card-actions button {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 5px;
    background-color: var(--primary-color);
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.card-actions button:hover {
    background-color: #004a80;
}

.card-admin-icons {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
    padding: 5px;
    display: flex;
    gap: 10px;
}

.card-admin-icons i {
    cursor: pointer;
    color: var(--text-color);
    font-size: 1.1rem;
}
.card-admin-icons i:hover {
    color: var(--primary-color);
}
.card-admin-icons .fa-trash-alt:hover {
    color: var(--danger-color);
}

/* Admin-only visibility */
.admin-only {
    display: none;
}
body.admin-mode .admin-only {
    display: revert; /* Or flex, block, etc. as needed */
}

/* FAB */
.fab {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    color: var(--text-color);
    font-size: 2rem;
    border: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.2s;
}
.fab:hover {
    transform: scale(1.1);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 2rem;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 10px;
    position: relative;
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-btn {
    color: #aaa;
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover {
    color: black;
}

#item-form, #loan-form, #add-category-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#item-form label, #loan-form label {
    font-weight: bold;
}

#item-form input, #item-form textarea, #item-form select,
#loan-form input, #add-category-form input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
    box-sizing: border-box;
}

#item-form button, #loan-form button, #add-category-form button {
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#item-form button:hover, #loan-form button:hover, #add-category-form button:hover {
    background-color: #004a80;
}

/* Active Loans List */
#active-loans-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.loan-item {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    display: grid;
    grid-template-columns: 80px 1fr 1fr 150px;
    align-items: center;
    gap: 1.5rem;
}

.loan-item-img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 5px;
}

.loan-item-details h3 {
    margin: 0 0 5px 0;
}

.loan-item-details p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--gray-color);
}

.loan-timer {
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
}
.loan-timer .overdue-label {
    display: block;
    font-size: 0.9rem;
    font-weight: normal;
    color: var(--danger-color);
}
.loan-timer.overdue {
    color: var(--danger-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.loan-actions button {
    width: 100%;
    padding: 0.75rem;
    border-radius: 5px;
    border: none;
    font-size: 0.9rem;
    cursor: pointer;
}

.loan-actions .return-btn {
    background-color: var(--success-color);
    color: white;
}
.loan-actions .mark-returned-btn {
    background-color: var(--warning-color);
    color: var(--text-color);
}

.overdue-warning {
    color: var(--danger-color);
    font-weight: bold;
    text-align: center;
    font-size: 1.1rem;
}

/* History Log Table */
#history-log-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

#history-log-table th, #history-log-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

#history-log-table th {
    background-color: #eef2f5;
}

#history-log-table tbody tr:last-child td {
    border-bottom: none;
}

.status-log.completed {
    color: var(--success-color);
    font-weight: bold;
}
.status-log.overdue {
    color: var(--danger-color);
    font-weight: bold;
}

/* Category Management in Modal */
#existing-categories-list {
    list-style: none;
    padding: 0;
}
#existing-categories-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 0.5rem;
}

#existing-categories-list .delete-category-btn {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 1.2rem;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
    }
    .loan-item {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .loan-item-img {
        margin: 0 auto;
    }
    .loan-timer {
        margin: 1rem 0;
    }
}