.masthead {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 500;
        padding: 22px 0;
        transition: padding .4s var(--ease), background .4s var(--ease), border-color .4s var(--ease);
        border-bottom: 1px solid transparent;
    }

    .masthead.scrolled {
        padding: 14px 0;
        background: rgba(10, 14, 20, .92);
        backdrop-filter: blur(10px);
        border-bottom-color: var(--dark-line);
    }

    .masthead-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .logo {
        font-family: var(--f-mono);
        font-weight: 700;
        font-size: 1.05rem;
        letter-spacing: .1em;
        color: var(--cream-text);
        display: flex;
        align-items: center;
        gap: 2px;
    }

    .logo span {
        color: var(--amber);
    }

    .nav {
        display: flex;
        gap: 40px;
    }

    .nav-link {
        font-family: var(--f-mono);
        font-size: .78rem;
        letter-spacing: .08em;
        text-transform: uppercase;
        color: var(--steel);
        position: relative;
        padding: 4px 0;
        transition: color .3s;
    }

    .nav-link::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        height: 1px;
        width: 0;
        background: var(--amber);
        transition: width .35s var(--ease);
    }

    .nav-link:hover {
        color: var(--cream-text);
    }

    .nav-link:hover::after {
        width: 100%;
    }

    .nav-toggle {
        display: none;
        flex-direction: column;
        gap: 5px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 6px;
    }

    .nav-toggle span {
        width: 22px;
        height: 2px;
        background: var(--cream-text);
        transition: transform .3s, opacity .3s;
    }

    .nav-toggle.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    @media (max-width: 860px) {
        .nav {
            position: fixed;
            top: 0;
            right: 0;
            height: 100vh;
            width: min(78vw, 320px);
            background: var(--ink);
            flex-direction: column;
            justify-content: center;
            gap: 34px;
            padding: 40px;
            transform: translateX(100%);
            transition: transform .5s var(--ease);
            border-left: 1px solid var(--dark-line);
        }

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

        .nav-toggle {
            display: flex;
        }
    }