/* ============================================================
   /data/css/nav.css
   Topbar / Navigation / Mobile burger menu
   ============================================================ */

/* Topbar */
.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: linear-gradient(
        to bottom,
        rgba(10, 11, 14, .72),
        rgba(10, 11, 14, .42)
    );
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 0;
}

/* Brand */
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: 160px;
}

.brand-title {
    font-weight: 800;
    letter-spacing: .2px;
}

.brand-title::first-letter {
    color: var(--accent);
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    min-width: 160px;
}

.brand-logo img {
    display: block;
    width: auto;
    height: 40px;
    max-width: 280px;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
    border: 1px solid transparent;
    border-radius: 999px;
    color: var(--muted);
}

.nav-link:hover {
    color: var(--text);
    text-decoration: none;
    background: var(--glass);
    border-color: var(--border);
}

.nav-link.is-active {
    color: var(--text);
    background: rgba(216, 103, 0, .14);
    border-color: rgba(216, 103, 0, .35);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Burger button */
.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--text);
    background: var(--glass);
    box-shadow: var(--shadow);
    cursor: pointer;
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, .1);
    border-color: rgba(255, 255, 255, .2);
}

.nav-toggle:active {
    transform: translateY(1px);
}

.nav-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.nav-toggle-icon {
    position: relative;
    display: block;
    width: 18px;
    height: 14px;
}

.nav-toggle-icon span {
    position: absolute;
    left: 0;
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition:
        top .2s ease,
        transform .2s ease,
        opacity .2s ease;
}

.nav-toggle-icon span:nth-child(1) {
    top: 0;
}

.nav-toggle-icon span:nth-child(2) {
    top: 6px;
}

.nav-toggle-icon span:nth-child(3) {
    top: 12px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) {
    top: 6px;
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3) {
    top: 6px;
    transform: rotate(-45deg);
}

/* Mobile drawer */
.nav-drawer {
    display: none;
}

.nav-mobile {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 10px 0 14px;
}

.nav-mobile .nav-link {
    justify-content: flex-start;
    width: 100%;
    padding: 11px 12px;
    border-radius: 12px;
}

.nav-mobile .nav-link-logout {
    justify-content: space-between;
    margin-top: 4px;
    color: var(--text);
    border-color: var(--border);
    background: var(--glass);
}

.nav-mobile .nav-link-logout:hover {
    border-color: rgba(216, 103, 0, .35);
    background: rgba(216, 103, 0, .14);
}

/* Responsive */
@media (max-width: 860px) {
    .topbar-inner,
    .nav-drawer > .container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .nav-desktop,
    .topbar-logout {
        display: none;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .nav-drawer {
        display: grid;
        grid-template-rows: 0fr;
        overflow: hidden;
        visibility: hidden;
        border-top: 1px solid transparent;
        opacity: 0;
        transition:
            grid-template-rows .25s ease,
            opacity .2s ease,
            visibility .25s ease,
            border-color .2s ease;
    }

    .nav-drawer > .container {
        min-height: 0;
    }

    .nav-drawer.is-open {
        grid-template-rows: 1fr;
        visibility: visible;
        border-top-color: var(--border);
        opacity: 1;
    }
}

@media (min-width: 861px) {
    .nav-drawer {
        display: none !important;
    }
}

/* Prevent text selection in top navigation */
.topbar,
.topbar * {
    user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}