.header {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    width: min(calc(100% - 2rem), 1140px);
    z-index: 1000;
    height: var(--header-h);
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.09);
    background: rgba(5, 7, 13, 0.38);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.28),
        0 2px 8px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
    transition:
        top 0.55s var(--ease),
        height 0.55s var(--ease),
        opacity 0.8s var(--ease),
        background 0.55s var(--ease),
        backdrop-filter 0.55s var(--ease),
        border-color 0.55s var(--ease),
        box-shadow 0.55s var(--ease),
        transform 0.55s var(--ease);
}

.header.scrolled {
    top: 0.625rem;
    height: var(--header-h-scrolled);
    transform: translateX(-50%) scale(0.988);
    background: rgba(5, 7, 13, 0.65);
    backdrop-filter: blur(28px) saturate(1.55);
    -webkit-backdrop-filter: blur(28px) saturate(1.55);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow:
        0 12px 48px rgba(0, 0, 0, 0.38),
        0 4px 16px rgba(0, 0, 0, 0.18),
        0 0 0 1px rgba(255, 255, 255, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.07);
}

.header__inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: 100%;
    padding: 0 clamp(1.5rem, 3.5vw, 2.25rem);
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-self: start;
    padding: 0.375rem 0;
}

.logo img {
    height: var(--logo-h);
    width: auto;
    mix-blend-mode: screen;
    filter: contrast(1.15) brightness(1.05);
}

.header.scrolled .logo img {
    height: var(--logo-h-scrolled);
}

.nav {
    display: flex;
    align-items: center;
    gap: 2.625rem;
    justify-self: center;
}

.nav a {
    font-size: 1.0625rem;
    font-weight: 500;
    letter-spacing: 0.015em;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
    line-height: 1.2;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0.125rem;
    left: 50%;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--blue-accent), transparent);
    transition: width 0.5s var(--ease), left 0.5s var(--ease), opacity 0.4s var(--ease);
    transform: translateX(-50%);
    opacity: 0.6;
}

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

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
    opacity: 1;
}

.header__actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-self: end;
}

.header-cta {
    padding: 0.6875rem 1.4375rem;
    font-size: 0.875rem;
    letter-spacing: -0.005em;
    transition:
        transform 0.5s var(--ease),
        box-shadow 0.5s var(--ease),
        background 0.4s ease;
}

.header-cta:hover {
    transform: translateY(-2px);
}

.header-cta:active {
    transform: translateY(0) scale(0.98);
}

.menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    padding: 10px;
    transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-hover);
}

.menu-btn span {
    display: block;
    width: 100%;
    height: 1.5px;
    background: var(--text-primary);
    transition: transform 0.35s var(--ease), opacity 0.3s ease;
    transform-origin: center;
}

.menu-btn.active span:first-child {
    transform: translateY(3.25px) rotate(45deg);
}

.menu-btn.active span:last-child {
    transform: translateY(-3.25px) rotate(-45deg);
}

@media (max-width: 960px) {
    .header {
        width: calc(100% - 1.25rem);
        top: 0.625rem;
        border-radius: 20px;
    }

    .header.scrolled {
        top: 0.5rem;
    }

    .header__inner {
        grid-template-columns: 1fr auto;
        padding: 0 clamp(1.25rem, 4vw, 1.75rem);
        gap: 1rem;
    }

    .logo {
        padding: 0.25rem 0;
    }

    .nav {
        position: fixed;
        top: calc(var(--header-h) + 1rem);
        left: 0.625rem;
        right: 0.625rem;
        flex-direction: column;
        gap: 0;
        background: rgba(5, 7, 13, 0.94);
        backdrop-filter: blur(28px) saturate(1.5);
        -webkit-backdrop-filter: blur(28px) saturate(1.5);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 16px;
        padding: 0.5rem 0 0.75rem;
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.5s var(--ease), opacity 0.4s ease;
        pointer-events: none;
        justify-self: stretch;
        box-shadow:
            0 16px 48px rgba(0, 0, 0, 0.4),
            inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }

    .header.scrolled .nav {
        top: calc(var(--header-h-scrolled) + 0.875rem);
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav a {
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 1.0625rem;
    }

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

    .header-cta { display: none; }

    .menu-btn { display: flex; }
}

@media (max-width: 480px) {
    :root {
        --header-h: 84px;
        --header-h-scrolled: 76px;
        --logo-h: 58px;
        --logo-h-scrolled: 52px;
    }

    .header__inner {
        padding: 0 1.125rem;
    }

    .menu-btn {
        width: 42px;
        height: 42px;
    }
}