/* Colours */
:root {
    --blue: #0050A0;
    --light-blue: #4FA3FF;
    --white: #ffffff;
    --black: #000000;
    --grey: #f2f2f2;
}

/* Reset */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: var(--grey);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--blue);
    color: var(--white);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    padding-top: 20px;
    transition: transform 0.3s ease;
}

.logo-section {
    text-align: center;
    padding: 10px;
}

.logo {
    width: 90px;
    margin-bottom: 10px;
}

.nav {
    margin-top: 20px;
}

.nav-item {
    width: 100%;
    padding: 14px 20px;
    background: none;
    border: none;
    color: var(--white);
    text-align: left;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    gap: 10px;
    align-items: center;
}

.nav-item:hover {
    background: var(--light-blue);
}

/* Main content */
.content {
    margin-left: 260px;
    padding: 20px;
}

/* Mobile */
.menu-btn {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    font-size: 26px;
    background: var(--blue);
    color: var(--white);
    border: none;
    padding: 10px;
    border-radius: 6px;
    z-index: 1001;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 1000;
}

/* Mobile behaviour */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-260px);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .menu-btn {
        display: block;
    }

    .content {
        margin-left: 0;
        padding-top: 70px;
    }

    .overlay.show {
        display: block;
    }
}