.site-nav {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem clamp(1.25rem, 4vw, 3rem);
    background: color-mix(in srgb, var(--bg) 78%, transparent);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom: 1px solid transparent;
    transition: border-color var(--dur-sm) var(--ease), background var(--dur-md) var(--ease);
}

.site-nav.is-scrolled {
    border-bottom-color: var(--border);
}

.nav-mark {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: baseline;
    gap: 0.15rem;
}

.nav-mark .dot {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    font-size: 0.92rem;
}

.nav-links a {
    position: relative;
    color: var(--text-secondary);
    padding: 0.3rem 0.1rem;
    transition: color var(--dur-sm) var(--ease);
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 100%;
    bottom: -4px;
    height: 1.5px;
    background: var(--accent);
    transition: right var(--dur-md) var(--ease);
}

.nav-links a:hover,
.nav-links a.is-active {
    color: var(--text-primary);
}

.nav-links a.is-active::after {
    right: 0;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    transition: color var(--dur-sm) var(--ease), border-color var(--dur-sm) var(--ease), transform var(--dur-sm) var(--ease);
}

.icon-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

@media (max-width: 860px) {
    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: var(--bg-elevated);
        border-bottom: 1px solid var(--border);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--dur-md) var(--ease);
    }

    .nav-links.is-open {
        max-height: 420px;
    }

    .nav-links a {
        width: 100%;
        padding: 1rem clamp(1.25rem, 4vw, 3rem);
        border-bottom: 1px solid var(--border);
    }

    .nav-links a::after {
        display: none;
    }

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

    .nav-actions .btn-primary.resume-nav-btn {
        display: none;
    }
}