/* Top Navigation Bar */
.top-navbar {
    height: var(--topbar-height);
    background: var(--dark-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    right: 0;
    left: var(--sidebar-width);
    z-index: 1030;
    transition: all 0.3s;
}
/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: var(--dark-color);
    color: white;
    z-index: 1040;
    transition: all 0.3s;
    overflow-y: auto;
}
.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    padding: 1.5rem 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: white;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.sidebar-nav {
    padding: 0;
    list-style: none;
}
.nav-item {
    position: relative;
}
.nav-link {
    display: flex;
    align-items: center;
    padding: 1rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s;
}
.nav-link:hover, .nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}
.nav-link i {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}