:root {
    --nav-backdrop: rgba(15, 12, 41, 0.45);
}

body[data-theme="light"] {
    --nav-backdrop: rgba(26, 32, 44, 0.28);
}

[hidden] {
    display: none !important;
}

body.nav-open {
    overflow: hidden;
}

.site-nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    flex: 0 0 36px;
    padding: 0;
    color: var(--white, var(--text, #ffffff));
    background: var(--card-bg, var(--bg, rgba(255, 255, 255, 0.12)));
    border: 1px solid var(--card-border, var(--border, rgba(255, 255, 255, 0.25)));
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.site-nav-toggle:hover {
    background: var(--white-10, rgba(255, 255, 255, 0.1));
    box-shadow: var(--card-shadow, 0 4px 16px rgba(0, 0, 0, 0.2));
}

.site-nav-toggle:active {
    transform: scale(0.93);
}

.site-brand-row {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr) 36px;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.site-brand-row::after {
    content: "";
}

.site-brand {
    display: inline-block;
    justify-self: center;
    max-width: 100%;
    color: var(--white, var(--text, #ffffff));
    text-decoration: none;
}

.site-brand-title {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    font-size: clamp(1.1rem, 5vw, 1.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.site-brand-icon {
    width: 2.25rem;
    height: 2.25rem;
    flex: none;
}

.site-brand::after {
    content: "";
    display: block;
    width: 100%;
    height: 4px;
    border-radius: 4px;
    background: linear-gradient(90deg, #60a5fa, #a78bfa, #f472b6, #fbbf24, #60a5fa);
    background-size: 200% 100%;
    animation: site-brand-rainbow-slide 8s linear infinite;
}

@keyframes site-brand-rainbow-slide {
    to {
        background-position: 200% 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-brand::after {
        animation: none;
    }
}

.site-brand:focus-visible {
    border-radius: 4px;
    outline: 2px solid var(--accent, var(--primary, #60a5fa));
    outline-offset: 3px;
}

.site-brand-row > .site-nav-toggle {
    margin-bottom: 0;
}

.site-home-link {
    width: 36px;
    height: 36px;
    flex-basis: 36px;
    color: var(--primary, #60a5fa);
    background: var(--premium-bg, rgba(255, 255, 255, 0.04));
    border-color: var(--premium-border, rgba(255, 255, 255, 0.1));
    border-radius: var(--radius-md, 12px);
    text-decoration: none;
    transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.title-row > .site-home-link {
    width: 32px;
    height: 32px;
    flex-basis: 32px;
}

.site-home-link:hover {
    color: var(--primary, #60a5fa);
    background: var(--primary-glow, rgba(96, 165, 250, 0.15));
    border-color: var(--primary, #60a5fa);
    box-shadow: 0 0 0 3px var(--primary-glow, rgba(96, 165, 250, 0.15));
    transform: translateY(-1px);
}

.site-home-link:focus-visible {
    outline: 2px solid var(--primary, #60a5fa);
    outline-offset: 3px;
}

.site-home-link:active {
    transform: translateY(0) scale(0.96);
}

.site-home-icon {
    display: block;
    width: 19px;
    height: 19px;
}

.title-row > .site-nav-toggle {
    width: 32px;
    height: 32px;
    flex-basis: 32px;
    margin-bottom: 0;
}

.nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1100;
    background: var(--nav-backdrop);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.25s ease;
}

.nav-backdrop.is-open {
    opacity: 1;
}

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1101;
    display: flex;
    flex-direction: column;
    width: min(320px, 85vw);
    padding: 1rem 0.85rem 1.5rem;
    overflow-y: auto;
    color: var(--white, var(--text, #ffffff));
    background: var(--card-bg, var(--bg, rgba(15, 23, 42, 0.98)));
    border-right: 1.5px solid var(--card-border, var(--border, rgba(255, 255, 255, 0.25)));
    border-radius: 0 var(--radius-lg, 16px) var(--radius-lg, 16px) 0;
    box-shadow: var(--card-shadow, 0 8px 32px rgba(0, 0, 0, 0.25));
    backdrop-filter: blur(var(--premium-blur, 20px));
    -webkit-backdrop-filter: blur(var(--premium-blur, 20px));
    transform: translateX(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-nav.is-open {
    transform: translateX(0);
}

.site-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

#site-nav-title {
    color: inherit;
    font-size: 1.1rem;
    font-weight: 700;
}

.site-nav-group-label {
    margin: 0.85rem 0 0.35rem;
    color: var(--white-40, var(--text-muted, rgba(255, 255, 255, 0.4)));
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.site-nav-list {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    list-style: none;
}

.site-nav-list a {
    display: block;
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-md, 12px);
    color: var(--white-80, var(--text, rgba(255, 255, 255, 0.8)));
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}

.site-nav-list a:hover,
.site-nav-list a:focus-visible {
    background: var(--white-10, rgba(255, 255, 255, 0.1));
    color: var(--white, var(--text, #ffffff));
}

.site-nav-toggle:focus-visible,
#nav-close:focus-visible,
.site-nav-list a:focus-visible {
    outline: 2px solid var(--primary, var(--accent, #60a5fa));
    outline-offset: 2px;
}

.page-footer {
    margin-top: 1.5rem;
    padding-bottom: 1rem;
    text-align: center;
}

.page-footer hr {
    width: 100%;
    border: 0;
    border-top: 1px solid var(--border, rgba(255, 255, 255, 0.1));
}

.page-footer nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.2rem 0.7rem;
    padding-top: 0.35rem;
}

.page-footer a {
    font-size: 0.75rem;
}

.page-footer a:focus-visible {
    outline: 2px solid var(--accent, #60a5fa);
    outline-offset: 2px;
}