/* blocks/header/style.css */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}

.site-header__logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text);
}

/* Navigation desktop */
.site-header__nav ul {
    display: flex;
    gap: 2.25rem;
    list-style: none;
}

.site-header__nav a {
    display: inline-flex;
    align-items: baseline;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-muted);
    transition: color 0.2s ease;
}

.site-header__nav-index {
    color: var(--color-accent);
}

.site-header__nav a:hover,
.site-header__nav a:focus-visible {
    color: var(--color-text);
}

/* Burger */
.site-header__burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 0.3rem;
    width: 1.75rem;
    height: 1.15rem;
    background: none;
    border: none;
    padding: 0;
    z-index: 101;
}

.site-header__burger span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-text);
    transition: transform 0.25s ease, opacity 0.25s ease;
}

@media (max-width: 767px) {
    .site-header__burger {
        display: flex;
    }

    .site-header__nav {
        position: fixed;
        inset: 0;
        background-color: var(--color-bg);
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s;
    }

    .site-header__nav.is-open {
        opacity: 1;
        visibility: visible;
    }

    .site-header__nav ul {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .site-header__nav a {
        font-family: var(--font-display);
        font-size: clamp(2rem, 10vw, 3rem);
        text-transform: uppercase;
        letter-spacing: 0.01em;
        color: var(--color-text);
        gap: 0.75rem;
    }

    .site-header__nav-index {
        font-family: var(--font-mono);
        font-size: 1rem;
    }

    .site-header__burger.is-active span:first-child {
        transform: translateY(4px) rotate(45deg);
    }

    .site-header__burger.is-active span:last-child {
        transform: translateY(-4px) rotate(-45deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-header__nav {
        transition: none;
    }
}