:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --light: #f8f9fa;
    --dark: #212529;
}

body {
    background-color: #f5f7fb;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.dashboard-header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 2rem 0;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.stat-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.card-header {
    background-color: var(--primary);
    color: white;
    font-weight: 600;
    padding: 0.75rem 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

.total-count {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    text-align: center;
    margin: 1rem 0;
}

.chart-container {
    height: 300px;
    position: relative;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    flex-direction: column;
}

.spinner {
    width: 3rem;
    height: 3rem;
    border: 5px solid rgba(67, 97, 238, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.last-updated {
    font-size: 0.85rem;
    color: #6c757d;
    text-align: right;
    margin-top: 1rem;
}

.refresh-btn {
    background-color: var(--primary);
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-left: 10px;
}

.refresh-btn:hover {
    background-color: var(--secondary);
}

footer {
    background-color: var(--dark);
    color: white;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

.lang-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    border-radius: 20px;
    padding: 5px 15px;
    cursor: pointer;
    transition: background 0.3s;
}

.lang-btn:hover, .lang-btn.active {
    background: rgba(255, 255, 255, 0.4);
}