:root {
    --tb-height: 64px;
    --tb-side-pad: 20px;
    --tb-bg: rgba(255, 255, 255, 0.8);
    --tb-border: rgba(0, 0, 0, 0.08);
    --tb-text: #111;
    --tb-text-dim: #555;
    --tb-accent: #111;
    --tb-font-family: SFMono-Regular, monospace;

    --tb-glass-bg: rgba(255, 255, 255, 0.16);
    --tb-glass-border: rgba(255, 255, 255, 0.55);
    --tb-glass-shadow: 0 4px 10px rgba(15, 23, 42, 0.30);
    --tb-glass-highlight: rgba(255, 255, 255, 0.85);
    --tb-glass-tint: rgba(120, 132, 255, 0.28);
}

html { scroll-behavior: smooth; }
#landing, #services, #clients, #about, #contact {
    scroll-margin-top: var(--tb-height);
}

.topbar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    height: var(--tb-height);
    display: flex;
    align-items: center;
    padding: 0 var(--tb-side-pad);
    font-family: var(--tb-font-family), sans-serif;
    background:
        radial-gradient(circle at 0% 0%, rgba(255, 255, 255, 0.35), transparent 55%),
        var(--tb-glass-bg);
    border-bottom: 1px solid var(--tb-glass-border);
    backdrop-filter: blur(22px) saturate(180%);
    -webkit-backdrop-filter: blur(22px) saturate(180%);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.05);
    transition:
        background 220ms ease,
        box-shadow 220ms ease,
        border-color 220ms ease,
        transform 220ms ease;
    transform: translateZ(0);
    overflow: hidden;
}
.topbar::before {
    content: "";
    position: absolute;
    inset: -40px -40px auto -40px;
    background:
        radial-gradient(circle at 15% 0%, var(--tb-glass-highlight), transparent 55%),
        radial-gradient(circle at 85% 0%, var(--tb-glass-tint), transparent 60%);
    opacity: 0.9;
    mix-blend-mode: screen;
    filter: blur(8px);
    pointer-events: none;
    transition:
        opacity 400ms ease,
        transform 400ms ease;
}

.topbar.topbar--scrolled {
    background:
        radial-gradient(circle at 0% 0%, rgba(255, 255, 255, 0.20), transparent 50%),
        radial-gradient(circle at 100% 0%, var(--tb-glass-tint), transparent 55%),
        rgba(15, 23, 42, 0.10);
    border-bottom-color: rgba(255, 255, 255, 0.35);
    box-shadow: var(--tb-glass-shadow);
    transform: translateZ(0);
}
.topbar.topbar--scrolled::before {
    opacity: 0.65;
    transform: translateY(-10px) scale(0.98);
}

.topbar__inner {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar__brand {
    font-weight: 500;
    font-size: 22px;
    letter-spacing: 1px;
    text-decoration: none;
    color: var(--tb-text);
    white-space: nowrap;
    font-family: SFMono-Regular, monospace;
    transform: translateY(2px);
}

.topbar__menuBtn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--tb-border);
    background: transparent;
    cursor: pointer;
    transition: background-color 120ms ease, transform 80ms ease;
}
.topbar__menuBtn:active { transform: scale(0.98) }
.topbar_menuIcon {
    width: 22px;
    height: 22px; display: block;
}
.topbar__menuBtn:hover { background: rgba(0, 0, 0, 0.04); }
.topbar__menuBtn:focus-visible { outline: 2px solid #6aa2ff; outline-offset: 2px; }

.menu {
    position: fixed;
    top: var(--tb-height);
    right: 0;
    min-width: 220px;
    padding: 16px 32px;
    border: none;
    box-shadow: none;
    z-index: 1001;
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
    transition:
        transform 200ms ease-out,
        opacity 200ms ease-out;
}
.menu.is-open {
    transform: translateX(0%);
    opacity: 1;
    pointer-events: auto;
}

.menu.is-open .menu__link {
    animation: menuItemIn 260ms ease-out forwards;
}

.menu__list {
    list-style: none;
    margin: 0;
    padding: 0;
}
.menu__list li + li {
    border-top: 1px solid var(--tb-border);
}

.menu__link {
    display: block;
    padding: 10px 0;
    text-decoration: none;
    color: var(--tb-text-dim);
    text-align: right;
    transition: color 120ms ease;
    font-family: var(--tb-font-family), sans-serif;
    font-size: 2vw;

    opacity: 0;
    transform: translateX(20px);
}
.menu__link:hover, .menu__link:focus-visible {
    color: var(--tb-text);
    outline: none;
}

.menu-backdrop {
    position: fixed;
    inset: 0;
    background: transparent;
    display: none;
    z-index: 999;
}
.menu-backdrop.is-open {
    display: block;
    background: linear-gradient(to bottom left, rgba(255, 255, 255, 0.8), rgba(0, 0, 0, 0), rgba(0, 0, 0, 0), rgba(0, 0, 0, 0));
    animation: backdrop-gradient 4s;
}

.menu.is-open .menu__list li:nth-child(1) .menu__link {
    animation-delay: 0.1s;
}
.menu.is-open .menu__list li:nth-child(2) .menu__link {
    animation-delay: 0.2s;
}
.menu.is-open .menu__list li:nth-child(3) .menu__link {
    animation-delay: 0.3s;
}
.menu.is-open .menu__list li:nth-child(4) .menu__link {
    animation-delay: 0.4s;
}
.menu.is-open .menu__list li:nth-child(5) .menu__link {
    animation-delay: 0.5s;
}

@keyframes backdrop-gradient {
    0% {
        background: linear-gradient(to bottom left, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0));
    }
    100% {
        background: linear-gradient(to bottom left, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0));
    }
}

@keyframes menuItemIn {
    0% {
        opacity: 0;
        transform: translateX(20px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@media (max-width: 560px) {
    .menu {
        right: 12px;
        min-width: 200px;
    }
    .menu__link {
        font-size: 1.5rem;
    }
}