.site-header,
.site-header * {
    box-sizing: border-box;
}

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.5vw, 2.5rem);
    width: 100%;
    min-height: 72px;
    padding: 0.75rem clamp(1rem, 4vw, 2.5rem);
    color: #f8fafc;
    background: rgba(10, 15, 28, 0.94);
    border-bottom: 1px solid rgba(34, 211, 238, 0.12);
    backdrop-filter: blur(18px);
    font-family: 'DM Sans', sans-serif;
}

.site-header__logo {
    flex: 0 0 auto;
    color: #f8fafc;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
}

.site-header__logo span {
    color: #22d3ee;
}

.site-nav {
    display: flex;
    flex: 1 1 auto;
    align-items: center;
    justify-content: center;
    gap: clamp(0.75rem, 2vw, 1.75rem);
    min-width: 0;
}

.site-nav__link {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    color: #a3adbd;
    font-size: 0.88rem;
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.18s ease;
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
    color: #f8fafc;
}

.site-header__actions {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    gap: 0.5rem;
}

.site-header__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.55rem 1.1rem;
    border: 1px solid #22d3ee;
    border-radius: 8px;
    background: #22d3ee;
    color: #0a0f1c;
    font-size: 0.86rem;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.site-header__cta:hover {
    transform: translateY(-1px);
    border-color: #06b6d4;
    background: #06b6d4;
}

.site-nav__toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 8px;
    background: transparent;
    color: #f8fafc;
    cursor: pointer;
}

.site-nav__icon,
.site-nav__icon::before,
.site-nav__icon::after {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform 0.18s ease, opacity 0.18s ease;
}

.site-nav__icon {
    position: relative;
}

.site-nav__icon::before,
.site-nav__icon::after {
    position: absolute;
    left: 0;
    content: "";
}

.site-nav__icon::before {
    transform: translateY(-6px);
}

.site-nav__icon::after {
    transform: translateY(6px);
}

.site-nav__toggle[aria-expanded="true"] .site-nav__icon {
    background: transparent;
}

.site-nav__toggle[aria-expanded="true"] .site-nav__icon::before {
    transform: rotate(45deg);
}

.site-nav__toggle[aria-expanded="true"] .site-nav__icon::after {
    transform: rotate(-45deg);
}

.site-header a:focus-visible,
.site-nav__toggle:focus-visible {
    outline: 3px solid #67e8f9;
    outline-offset: 3px;
}

@media (max-width: 900px) {
    .site-header {
        min-height: 68px;
        gap: 0.75rem;
        padding: 0.65rem 1rem;
    }

    .site-header__logo {
        font-size: 1.28rem;
    }

    .site-nav__toggle {
        display: none;
        order: 0;
    }

    .site-header.site-nav-ready .site-nav__toggle {
        display: inline-flex;
    }

    .site-header__cta {
        order: 1;
        padding: 0.5rem 0.85rem;
        font-size: 0.82rem;
    }

    .site-header__actions {
        gap: 0.5rem;
    }

    .site-nav {
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0.25rem;
        padding: 0.5rem 1rem 1rem;
        border-bottom: 1px solid rgba(34, 211, 238, 0.16);
        background: rgba(10, 15, 28, 0.98);
        box-shadow: 0 14px 24px rgba(0, 0, 0, 0.24);
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
    }

    .site-header.site-nav-ready .site-nav {
        opacity: 0;
        visibility: hidden;
        transform: translateY(-0.4rem);
    }

    .site-header.site-nav-ready[data-menu-open="true"] .site-nav {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .site-nav__link {
        min-height: 48px;
        padding: 0.5rem 0.75rem;
        border-radius: 6px;
        font-size: 0.96rem;
        white-space: normal;
    }

    .site-nav__link:hover,
    .site-nav__link[aria-current="page"] {
        background: rgba(34, 211, 238, 0.1);
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-nav__link,
    .site-header__cta,
    .site-nav__icon,
    .site-nav__icon::before,
    .site-nav__icon::after,
    .site-nav {
        transition: none;
    }
}