header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;

    background: var(--black-0-60);
    backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--black-400);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 220px;
    text-decoration: none;
    color: inherit;
}

.brand-mark {
    width: 38px;
    height: 38px;
    border: 1px solid var(--black-1000);
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: linear-gradient(180deg, var(--bg), var(--black-200));
    box-shadow: 0 6px 18px var(--black-300);
    flex-shrink: 0;
}

.brand-name {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
    min-width: 0;
}

.brand-name strong {
    font-family: var(--serif);
    letter-spacing: .2px;
    font-size: 18px;
}

.brand-name span {
    font-size: 12px;
    color: var(--black-700);
    letter-spacing: .2px;
}

nav.desktop-nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.navlink {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 999px;
    border: 1px solid var(--transparent);
    color: var(--black-1000);
    font-size: 13px;
    letter-spacing: .2px;
    background: var(--transparent);
    transition: all 0.5s;
    text-decoration: none;
}

.navlink:hover {
    border-color: var(--black-400);
    background: var(--bg);
}

.navlink .dot {
    width: 6px;
    height: 6px;
    border-radius: 99px;
    background: var(--black-1000);
    opacity: .9;
    flex-shrink: 0;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--black-1000);
    background: var(--black-1000);
    color: var(--bg);
    font-size: 13px;
    letter-spacing: .2px;
    box-shadow: 0 10px 26px var(--black-400);
    white-space: nowrap;
    text-decoration: none;
    transition: all 0.3s;
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 34px var(--black-450);
}

/* burger */
.menu-toggle {
    display: none;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    border: 1px solid var(--black-400);
    background: var(--black-0-40);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background .25s, border-color .25s, transform .25s;
    padding: 0;
}

.menu-toggle:hover {
    background: var(--bg);
    border-color: var(--black-600);
}

.menu-toggle:active {
    transform: scale(.98);
}

.menu-toggle svg {
    width: 22px;
    height: 22px;
    display: block;
}

.menu-toggle .line {
    transition: transform .25s ease, opacity .2s ease;
    transform-origin: center;
}

.menu-toggle.is-open .line-1 {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle.is-open .line-2 {
    opacity: 0;
}

.menu-toggle.is-open .line-3 {
    transform: translateY(-6px) rotate(-45deg);
}

/* overlay */
.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 1090;
    background: rgba(0, 0, 0, 0.34);
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s ease;
}

.mobile-nav-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}

/* drawer */
.mobile-drawer {
    position: fixed;
    top: 0;
    right: 0;
    height: 100dvh;
    width: min(380px, 88vw);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--black-400);
    box-shadow: -20px 0 48px var(--black-400);
    transform: translateX(100%);
    transition: transform .32s ease;
}

.mobile-drawer.is-open {
    transform: translateX(0);
}

.mobile-drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 18px 14px;
    border-bottom: 1px solid var(--black-300);
}

.mobile-drawer-title {
    font-family: var(--serif);
    font-size: 18px;
    letter-spacing: .2px;
}

.mobile-drawer-close {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--black-400);
    background: var(--transparent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background .25s, border-color .25s;
    padding: 0;
}

.mobile-drawer-close:hover {
    background: var(--black-100);
    border-color: var(--black-600);
}

.mobile-drawer-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 18px;
    overflow-y: auto;
}

.mobile-navlink {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 48px;
    padding: 14px 16px;
    border-radius: 18px;
    border: 1px solid var(--black-250);
    background: var(--black-0-20);
    color: var(--black-1000);
    text-decoration: none;
    transition: background .25s, border-color .25s, transform .25s;
}

.mobile-navlink:hover {
    background: var(--bg);
    border-color: var(--black-500);
    transform: translateX(-2px);
}

.mobile-navlink .dot {
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: var(--black-1000);
    opacity: .9;
    flex-shrink: 0;
}

.mobile-drawer-footer {
    padding: 18px;
    border-top: 1px solid var(--black-300);
    margin-top: auto;
}

/* body lock */
body.menu-open {
    overflow: hidden;
}