.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--color-surface);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}

@media (prefers-reduced-motion: reduce) {
    .navigation a::after,
    .btn,
    .social-icons a,
    .social-footer a {
        transition: none !important;
    }
}

.site-header__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px clamp(20px, 4vw, 32px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo img {
    width: 150px;
    height: auto;
}

.navigation {
    display: flex;
    align-items: center;
}

.navigation ul {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.navigation a {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-base);
}

.navigation a::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.2s ease-in-out;
}

.navigation a:hover,
.navigation a:focus-visible {
    color: var(--color-accent);
}

.navigation a:hover::after,
.navigation a:focus-visible::after {
    transform: scaleX(1);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.social-icons {
    display: flex;
    gap: 12px;
}

.social-icons a {
    color: rgba(226, 232, 240, 0.78);
    font-size: 1rem;
    transition: color 0.3s ease;
}

.social-icons a:hover {
    color: var(--color-accent);
}

.btn {
    border: none;
    border-radius: 999px;
    padding: 10px 20px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn--ghost {
    background: rgba(148, 163, 184, 0.15);
    color: var(--color-text-primary);
}

.btn--ghost:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-alt));
    color: #fff;
    box-shadow: 0 10px 30px rgba(56, 189, 248, 0.4);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.45);
}

.hamburger-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger-menu .bar {
    width: 26px;
    height: 3px;
    background: rgba(226, 232, 240, 0.9);
    border-radius: 999px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

@media (max-width: 1100px) {
    .site-header__inner {
        gap: 16px;
    }

    .navigation {
        position: fixed;
        inset: 72px 16px auto 16px;
        padding: 28px;
        background: var(--color-surface);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        display: none;
        z-index: 1000;
    }

    .navigation ul {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .navigation.active {
        display: block;
    }

    .header-actions {
        margin-left: auto;
    }

    .hamburger-menu {
        display: flex;
    }
}

@media (max-width: 768px) {
    .site-header__inner {
        padding: 16px;
    }

    .header-actions {
        gap: 12px;
    }

    .social-icons {
        display: none;
    }

    .btn--ghost {
        padding: 8px 16px;
    }
}