/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f5;
    color: #333;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: linear-gradient(180deg, #1976d2 0%, #1565c0 100%);
    color: white;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.2);
}

.sidebar-header h2 {
    font-size: 18px;
    margin-bottom: 5px;
}

.sidebar-header p {
    font-size: 12px;
    opacity: 0.8;
}

.sidebar-nav {
    flex: 1;
    padding: 10px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: white;
    text-decoration: none;
    transition: background 0.3s;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
}

.nav-item.active {
    background: rgba(255,255,255,0.2);
    border-left: 4px solid white;
}

.nav-icon {
    margin-right: 10px;
    font-size: 18px;
    display: inline-block;
    width: 20px;
    height: 20px;
    vertical-align: middle;
}

.nav-icon img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    filter: brightness(0) invert(1);
    opacity: 0.95;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.2);
}

.user-info {
    margin-bottom: 10px;
    font-size: 14px;
}

.user-role {
    display: block;
    font-size: 12px;
    opacity: 0.8;
    margin-top: 5px;
}

.btn-logout {
    display: block;
    width: 100%;
    padding: 10px;
    background: rgba(255,255,255,0.2);
    color: white;
    text-align: center;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
}

.btn-logout:hover {
    background: rgba(255,255,255,0.3);
}

.sidebar-footer img,
.user-info img {
    filter: brightness(0) invert(1);
    opacity: 0.95;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e3f0ff;
}

.card-title {
    font-size: 18px;
    font-weight: bold;
    color: #1976d2;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

.btn-primary {
    background: #1976d2;
    color: white;
}

.btn-primary:hover {
    background: #1565c0;
}

.btn-success {
    background: #4caf50;
    color: white;
}

.btn-success:hover {
    background: #45a049;
}

.btn-danger {
    background: #f44336;
    color: white;
}

.btn-danger:hover {
    background: #da190b;
}

.btn-secondary {
    background: #757575;
    color: white;
}

.btn-secondary:hover {
    background: #616161;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th {
    background: #e3f0ff;
    color: #1976d2;
    padding: 12px;
    text-align: left;
    font-weight: bold;
    border-bottom: 2px solid #1976d2;
}

table td {
    padding: 10px 12px;
    border-bottom: 1px solid #e0e0e0;
}

table tr:hover {
    background: #f5f5f5;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1976d2;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card .stat-icon {
    font-size: 40px;
    margin-bottom: 10px;
    display: inline-block;
}

.stat-card .stat-icon img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.stat-card .stat-value {
    font-size: 32px;
    font-weight: bold;
    color: #1976d2;
    margin-bottom: 5px;
}

.stat-card .stat-label {
    color: #666;
    font-size: 14px;
}

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.modal-content {
    background: white;
    margin: 5% auto;
    padding: 20px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e3f0ff;
}

.close {
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

/* Ribbon Menu */
.ribbon {
    background: #e3f0ff;
    border-bottom: 2px solid #1976d2;
    padding: 10px;
    margin-bottom: 20px;
}

.ribbon-menu {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.ribbon-item {
    background: #eaf4fd;
    border: 1px solid #b5cbe7;
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    min-width: 100px;
}

.ribbon-item:hover {
    background: #dbeafc;
    border-color: #1976d2;
}

.ribbon-item.active {
    background: #1976d2;
    color: white;
    border-color: #1976d2;
}

.ribbon-item > div:first-child {
    margin-bottom: 5px;
}

.ribbon-item > div:first-child img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}