/* ── Site Header ─────────────────────────────────────────────────────────── */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--color-neutral-200);
    transition: box-shadow 0.2s ease, backdrop-filter 0.2s ease;
}

.site-header--scrolled {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: rgba(255, 255, 255, 0.85);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

/* ── Logo ────────────────────────────────────────────────────────────────── */

.site-header__logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-header__logo img {
    height: 28px;
    width: auto;
}

/* ── Hamburger Toggle ───────────────────────────────────────────────────── */

.site-header__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Hamburger open state */
.site-header__toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── Navigation ─────────────────────────────────────────────────────────── */

.site-header__nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu__link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius);
    border: none;
    background: none;
    cursor: pointer;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-menu__link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-neutral-50);
}

/* ── Dropdown ───────────────────────────────────────────────────────────── */

.nav-menu__item--has-dropdown {
    position: relative;
}

.dropdown-arrow {
    transition: transform 0.2s ease;
}

.nav-menu__dropdown-toggle[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    margin-top: 4px;
    padding: 0.5rem 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    list-style: none;
    z-index: 200;
}

.nav-dropdown--open {
    display: block;
}

.nav-dropdown__link {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: background-color 0.1s ease, color 0.1s ease;
}

.nav-dropdown__link:hover {
    background-color: var(--color-neutral-50);
    color: var(--color-text-primary);
}

/* ── CTA Button ─────────────────────────────────────────────────────────── */

.nav-cta {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.25rem;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-white);
    background-color: var(--color-black);
    border-radius: var(--radius);
    text-decoration: none;
    white-space: nowrap;
    transition: background-color 0.15s ease;
}

.nav-cta:hover {
    background-color: var(--color-soft-black);
    color: var(--color-white);
}

/* ── Mobile ─────────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
    .site-header__toggle {
        display: flex;
    }

    .site-header__nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 1rem var(--gap);
        background-color: var(--color-white);
        border-bottom: 1px solid var(--color-neutral-200);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    .site-header__nav--open {
        display: flex;
    }

    .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .nav-menu__link {
        padding: 0.75rem 0;
        font-size: 16px;
    }

    .nav-dropdown {
        position: static;
        border: none;
        box-shadow: none;
        margin-top: 0;
        padding-left: 1rem;
    }

    .nav-cta {
        margin-top: 1rem;
        text-align: center;
        justify-content: center;
    }
}