.layout-shell {
    display: flex;
    height: 100vh;
    overflow: hidden;
    font-family: Segoe UI, Arial, sans-serif;
}

.sidebar {
    width: 120px;
    background: #111827;
    color: white;
    padding: 12px;
    transition: width 0.25s ease;
    flex-shrink: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

    .sidebar.collapsed {
        width: 60px;
    }

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    min-height: 40px;
}

    .sidebar-header h3 {
        margin: 0;
        font-size: 18px;
        color: white;
    }

.sidebar-toggle {
    width: 36px;
    height: 36px;
    border: 1px solid rgba(255,255,255,0.25);
    background: rgba(255,255,255,0.08);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .sidebar-toggle:hover {
        background: rgba(255,255,255,0.18);
    }

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.main-zone {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100vh;
}

.top-header {
    height: 60px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 20px;
    gap: 20px;
    background: white;
}

.page-zone {
    flex: 1;
    overflow: auto;
    padding: 30px;
    background: #f9fafb;
}

.menu-link {
    color: white;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 8px;
    display: block;
    transition: background 0.2s ease;
}

    .menu-link:hover {
        background: rgba(255,255,255,0.08);
    }

    .menu-link.active {
        font-weight: bold;
        color: #60a5fa;
        background: rgba(255,255,255,0.08);
    }