header {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    background: var(--surface);
}

main {
    flex: 1;
    padding: 24px;
}
.btn-hamburger {
    display: inline-grid;
    place-items: center;
   
    border-radius: 8px;
    border: 0;
    background: transparent;
    cursor: pointer;
}

.hamburger-inner {
    width: 20px;
    height: 2px;
    background: #0f172a;
    position: relative;
    display: block
}

    .hamburger-inner::before, .hamburger-inner::after {
        content: "";
        position: absolute;
        left: 0;
        width: 100%;
        height: 2px;
        background: inherit
    }

    .hamburger-inner::before {
        top: -6px
    }

    .hamburger-inner::after {
        top: 6px
    }

.sidenav {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: var(--sidenav-width);
    background: #20261c;
    color: #fff;
    box-shadow: -12px 0 24px rgba(2,6,23,0.4);
    transform: translateX(110%);
    transition: transform var(--transition);
    z-index: 1200;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 20px 16px;
}

    .sidenav.open {
        transform: translateX(0)
    }

    .sidenav .logo {
        font-weight: 700;
        font-size: 18px;
        margin-bottom: 6px
    }

    .sidenav nav {
        display: flex;
        flex-direction: column;
        gap: 6px
    }

    .sidenav a {
        color: #e6eef8;
        text-decoration: none;
        padding: 10px 12px;
        border-radius: 8px;
        display: flex;
        align-items: center;
        gap: 10px
    }

        .sidenav a:hover {
            background: rgba(255,255,255,0.05)
        }

    .sidenav .footer {
        margin-top: auto;
        font-size: 13px;
        color: rgba(255,255,255,0.6)
    }

/* Overlay when open */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(2,6,23,0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    z-index: 1100;
}

    .overlay.visible {
        opacity: 1;
        pointer-events: auto
    }

/* Responsive behavior: on large screens keep sidenav visible by default (expandable) */
@media (min-width:1024px) {
    /* Example: show a collapsed mini-bar at right that expands when open */
    .sidenav {
        transform: translateX(120%);
    }
    /* keep hidden by default but you can change behavior */
}

/* Simple utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0
}