:root {
    --primary-color: #0d6efd;
    --sidebar-bg: #1a1d20;
    --sidebar-hover: #2b2f33;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    background-color: #f3f4f7;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    overflow-x: hidden;
}

#sidebar {
    min-width: 260px;
    max-width: 260px;
    min-height: 100vh;
    background-color: var(--sidebar-bg);
    box-shadow: 4px 0 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease-in-out;
    z-index: 1000;
}

#sidebar.collapsed {
    margin-left: -260px;
}

.logo-text {
    color: #fff;
    font-weight: 700;
    letter-spacing: 1px;
}

.sidebar .nav-link {
    color: #adb5bd;
    padding: 0.8rem 1rem;
    transition: all 0.3s;
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
    white-space: nowrap;
}

.sidebar .nav-link:hover {
    color: #fff;
    background-color: var(--sidebar-hover);
    border-radius: 8px;
}

.sidebar .nav-link.active {
    color: #fff;
    background-color: var(--primary-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

.stat-card {
    transition: transform 0.3s ease;
}

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

.img-thumbnail {
    border-radius: 12px;
    background-color: white;
}

.table thead th {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    color: #6c757d;
    border-top: none;
}

.table tbody td {
    vertical-align: middle;
    font-size: 0.9rem;
}

footer {
    width: 100%;
    background-color: #fff;
}