.header {
    position: sticky;
    top: 0;
    z-index: 1000;

    background: rgba(255, 255, 255, 0.84);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);

    border-bottom: 1px solid var(--color-border);

    transition:
        background-color 260ms cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 260ms cubic-bezier(0.22, 1, 0.36, 1),
        border-color 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.header.is-scrolled {
    background: rgba(255, 255, 255, 0.96);
    border-color: rgba(17, 24, 39, 0.08);
    box-shadow: 0 10px 30px rgba(17, 24, 39, 0.08);
}

.header__wrapper {
    min-height: var(--header-height);

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: var(--space-8);

    transition:
        min-height 320ms cubic-bezier(0.22, 1, 0.36, 1),
        gap 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.header.is-scrolled .header__wrapper {
    min-height: var(--header-height-scrolled, 82px);
}

.header__logo {
    flex: 0 0 auto;

    display: inline-flex;
    align-items: center;
    gap: var(--space-3);

    color: var(--color-text);
    text-decoration: none;

    font-weight: 900;

    transform-origin: left center;

    transition:
        transform 260ms cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 260ms cubic-bezier(0.22, 1, 0.36, 1),
        background-color 260ms cubic-bezier(0.22, 1, 0.36, 1),
        padding 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.header__logo:hover {
    transform: translateY(-1px);
}

.header.is-scrolled .header__logo:hover {
    transform: translateY(-1px) scale(0.985);
}

.header__logo img {
    height: var(--header-logo-height, 72px);
    width: auto;

    display: block;

    transform-origin: left center;
    will-change: height, transform;

    transition:
        height 320ms cubic-bezier(0.22, 1, 0.36, 1),
        transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
        filter 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.header.is-scrolled .header__logo img {
    height: var(--header-logo-height-scrolled, 58px);
    transform: scale(0.985);
}

.header__logo:hover img {
    transform: scale(1.03);
}

.header.is-scrolled .header__logo:hover img {
    transform: scale(1.01);
}

.header__logo span {
    font-size: var(--font-size-lg);
    line-height: 1.1;
}

.header__logo-boxed {
    padding: var(--header-logo-box-padding, 0.65rem 0.9rem);

    border: 1px solid rgba(255, 255, 255, 0.64);
    border-radius: var(--header-logo-radius, 1.5rem);

    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(12px);
}

.header__logo-shadow {
    box-shadow: var(--shadow-sm);
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.header__nav a {
    position: relative;

    color: var(--color-text-muted);
    text-decoration: none;

    font-weight: 850;

    transition: color var(--transition-base);
}

.header__nav a::after {
    content: "";

    position: absolute;
    left: 0;
    bottom: -0.45rem;

    width: 0;
    height: 2px;

    border-radius: var(--radius-pill);

    background: var(--color-brand);

    transition: width var(--transition-base);
}

.header__nav a:hover,
.header__nav a.is-active {
    color: var(--color-brand);
}

.header__nav a:hover::after,
.header__nav a.is-active::after {
    width: 100%;
}

.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.header__toggle {
    width: 48px;
    height: 48px;

    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;

    gap: 6px;

    border: 0;
    border-radius: var(--radius-pill);

    background: var(--color-brand-soft);

    cursor: pointer;
}

.header__toggle span {
    width: 24px;
    height: 2px;

    display: block;

    border-radius: var(--radius-pill);

    background: var(--color-text);

    transition:
        transform var(--transition-base),
        opacity var(--transition-base);
}

.header__toggle.is-active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.header__toggle.is-active span:nth-child(2) {
    opacity: 0;
}

.header__toggle.is-active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.header__mobile {
    display: none;
}

.header-overlay {
    position: fixed;
    inset: 0;

    z-index: 998;

    background: rgba(15, 23, 42, 0.42);

    opacity: 0;
    visibility: hidden;

    transition:
        opacity var(--transition-base),
        visibility var(--transition-base);
}

.header-overlay.is-active {
    opacity: 1;
    visibility: visible;
}

body.menu-open {
    overflow: hidden;
}

@media (max-width: 980px) {
    .header__nav,
    .header__cta {
        display: none;
    }

    .header__toggle {
        display: flex;
    }

    .header__mobile {
        position: fixed;
        top: var(--header-height-mobile, 86px);
        left: 0;
        right: 0;

        z-index: 1001;

        display: block;

        padding: var(--space-4);

        opacity: 0;
        visibility: hidden;
        transform: translateY(-12px);

        transition:
            opacity var(--transition-base),
            visibility var(--transition-base),
            transform var(--transition-base);
    }

    .header__mobile.is-active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .header__mobile-nav {
        width: min(520px, 100%);
        margin-inline: auto;

        display: flex;
        flex-direction: column;
        gap: var(--space-3);

        padding: var(--space-4);

        border: 1px solid var(--color-border);
        border-radius: var(--radius-xl);

        background: var(--color-surface);
        box-shadow: var(--shadow-lg);
    }

    .header__mobile-nav a:not(.btn) {
        padding: var(--space-4);

        border-radius: var(--radius-md);

        color: var(--color-text);
        text-decoration: none;
        font-weight: 850;

        transition:
            background var(--transition-base),
            color var(--transition-base);
    }

    .header__mobile-nav a:not(.btn):hover,
    .header__mobile-nav a:not(.btn).is-active {
        background: var(--color-brand-soft);
        color: var(--color-brand);
    }
}

@media (max-width: 560px) {
    .header__wrapper {
        gap: var(--space-4);
    }

    .header__logo img {
        height: var(--header-logo-height-mobile, 64px);
    }

    .header.is-scrolled .header__logo img {
        height: var(--header-logo-height-mobile-scrolled, 54px);
    }

    .header__logo-boxed {
        padding: var(--header-logo-box-padding-mobile, 0.5rem 0.65rem);
    }
}