/* --- Responsive Navigation --- */

:root {
    --nav-height-mobile: 64px;
    --nav-width-desktop: 80px;
}

/* Mobile First: Bottom Navigation */
.app-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(var(--nav-height-mobile) + env(safe-area-inset-bottom, 0px));
    background: #FFFFFF;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    /* Align to top of bar so padding absorbs the bottom space */
    padding-top: 0;
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
    box-sizing: border-box;
    /* Crucial so padding includes height */
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--muted);
    text-decoration: none;
    font-size: 10px;
    font-weight: 500;
    flex: 1;
    height: 100%;
    transition: color 0.2s ease;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-item:hover {
    color: var(--text-main);
    background-color: rgba(0, 0, 0, 0.02);
}

.nav-item.active {
    color: var(--accent);
}

.nav-icon {
    width: 24px;
    height: 24px;
}

/* Active State Logic: SVG handling */
.nav-item .solid-icon {
    display: none;
}

.nav-item .outline-icon {
    display: block;
}

.nav-item.active .solid-icon {
    display: block;
}

.nav-item.active .outline-icon {
    display: none;
}

/* Page Spacing for Mobile */
body {
    padding-bottom: calc(var(--nav-height-mobile) + 20px);
}

/* Desktop: Sidebar Navigation */
@media (min-width: 768px) {
    body {
        padding-bottom: 0;
        padding-left: var(--nav-width-desktop);
    }

    .app-nav {
        top: var(--top-bar-height);
        /* Below top bar */
        left: 0;
        bottom: 0;
        width: var(--nav-width-desktop);
        height: calc(100vh - var(--top-bar-height));
        flex-direction: column;
        justify-content: flex-start;
        border-top: none;
        border-right: 1px solid var(--border);
        padding: 24px 0;
        gap: 32px;
        z-index: var(--z-nav);
        /* Ensure below top bar if overlap occurs, though strictly layout handles it */
    }

    .nav-item {
        flex: 0 0 auto;
        height: auto;
        width: 64px;
        height: 64px;
        border-radius: 12px;
        gap: 6px;
    }

    .nav-item:hover {
        background-color: var(--bg-hover, #F3F4F6);
    }

    .nav-item.active {
        background-color: var(--glass);
    }
}

/* --- Layout Adjustments --- */
/* Center container mostly, but account for sidebar on desktop */
.container {
    max-width: 1200px;
    /* Slight increase for desktop layout */
}

/* Hide old header if present (we'll remove it manually, but this is a safeguard) */
/* header .brand rule removed */