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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f6fa;
    color: #333;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 250px;
    background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 20px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.logo {
    text-align: center;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 30px;
}

.logo h2 {
    font-size: 24px;
    font-weight: 600;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 15px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.menu-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.menu-item.active {
    background-color: #3498db;
    color: white;
}

.menu-item span:first-child {
    font-size: 20px;
}

/* Main Content Styles */
.main-content {
    margin-left: 250px;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background-color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.header h1 {
    font-size: 28px;
    color: #2c3e50;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

/* Content Styles */
.content {
    padding: 30px;
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.12);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
}

.stat-icon.blue {
    background-color: rgba(52, 152, 219, 0.1);
}

.stat-icon.green {
    background-color: rgba(46, 204, 113, 0.1);
}

.stat-icon.orange {
    background-color: rgba(230, 126, 34, 0.1);
}

.stat-icon.purple {
    background-color: rgba(155, 89, 182, 0.1);
}

.stat-details h3 {
    font-size: 14px;
    color: #7f8c8d;
    font-weight: 500;
    margin-bottom: 8px;
}

.stat-number {
    font-size: 28px;
    font-weight: bold;
    color: #2c3e50;
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.chart-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.chart-card h3 {
    margin-bottom: 20px;
    color: #2c3e50;
    font-size: 18px;
}

/* Bar Chart Placeholder */
.chart-placeholder {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 200px;
    padding: 20px 0;
}

.bar {
    width: 60px;
    background: linear-gradient(180deg, #3498db 0%, #2980b9 100%);
    border-radius: 8px 8px 0 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 10px;
    color: white;
    font-size: 12px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.bar:hover {
    background: linear-gradient(180deg, #2980b9 0%, #3498db 100%);
    transform: scale(1.05);
}

/* Activity List */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.activity-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.activity-item:hover {
    background-color: #e9ecef;
}

.activity-icon {
    width: 45px;
    height: 45px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.activity-details {
    flex: 1;
}

.activity-details p {
    margin-bottom: 5px;
    color: #2c3e50;
}

.activity-time {
    font-size: 12px;
    color: #95a5a6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
        padding: 20px 10px;
    }

    .logo h2 {
        font-size: 16px;
    }

    .menu-item span:last-child {
        display: none;
    }

    .main-content {
        margin-left: 70px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 20px;
    }
}