:root {
    --nav-bg: #000814;
    --nav-hover: #001d3d;
    --nav-accent: #ffc300;
    --nav-text: #e0e1dd;
    --nav-width: 250px;
}
#niche-sidebar {
    position: fixed;
    top: 0;
    left: calc(-1 * var(--nav-width));
    width: var(--nav-width);
    height: 100vh;
    background: var(--nav-bg);
    border-right: 1px solid var(--nav-hover);
    transition: left 0.3s ease;
    z-index: 1000;
    padding: 20px;
    display: flex;
    flex-direction: column;
}
#niche-sidebar.active {
    left: 0;
}
.nav-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    background: var(--nav-bg);
    border: 1px solid var(--nav-accent);
    color: var(--nav-accent);
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    z-index: 1001;
    transition: all 0.3s ease;
}
.nav-toggle:hover {
    background: var(--nav-accent);
    color: var(--nav-bg);
}
.sidebar-header {
    margin-bottom: 30px;
    text-align: center;
}
.sidebar-header h2 {
    color: var(--nav-accent);
    font-size: 1.5rem;
    margin: 0;
    letter-spacing: 2px;
}
.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.nav-links li {
    margin-bottom: 10px;
}
.nav-links a {
    color: var(--nav-text);
    text-decoration: none;
    display: block;
    padding: 10px;
    border-radius: 5px;
    transition: background 0.2s;
}
.nav-links a:hover {
    background: var(--nav-hover);
    color: var(--nav-accent);
}
.nav-category {
    color: var(--nav-accent);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 20px 0 10px 10px;
    opacity: 0.7;
}