:root {
    --bg: #0f172a;
    --bg-soft: #1e293b;
    --hover: #334155;
    --active: #38bdf8;
    --text: #cbd5e1;
}

.nav-lateral {
    width: 260px;
    height: 100vh;
    background: var(--bg);
    color: var(--text);
    position: fixed;
    transition: width .3s;
    overflow: hidden;
}

.nav-lateral.collapsed {
    width: 70px;
}

.nav-lateral-avatar {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--hover);
}

.nav-lateral-avatar img {
    width: 60px;
    border-radius: 50%;
}

.nav-lateral.collapsed .nav-lateral-avatar figcaption {
    display: none;
}

.nav-menu {
    list-style: none;
    padding: 0;
}

.nav-menu li a {
    display: flex;
    align-items: center;
    padding: 12px 18px;
    color: var(--text);
    text-decoration: none;
    transition: .3s;
}

.nav-menu li a:hover {
    background: var(--hover);
    color: var(--active);
}

.nav-menu li a.active {
    background: var(--hover);
    color: var(--active);
}

.nav-menu i {
    width: 25px;
}

.nav-menu span {
    transition: opacity .3s;
}

.nav-lateral.collapsed span {
    opacity: 0;
}

.submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease;
    background: var(--bg-soft);
}

.submenu.open {
    max-height: 500px;
}

.toggle-btn {
    position: absolute;
    top: 10px;
    right: -15px;
    background: var(--active);
    color: #000;
    border-radius: 50%;
    padding: 5px 8px;
    cursor: pointer;
}