/* ========================================
   BYJECS / GLOBAL HEADER
   ======================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;

    width: 100%;
    border-bottom: 1px solid transparent;
    background: var(--color-bg);

    transition:
        background-color var(--duration-medium) var(--ease-ui),
        border-color var(--duration-medium) var(--ease-ui),
        box-shadow var(--duration-medium) var(--ease-ui);
}

.site-header.is-scrolled {
    background: rgb(var(--color-bg-rgb) / 0.92);
    border-bottom-color: var(--color-border);
    box-shadow: 0 8px 30px rgb(0 0 0 / 0.15);
    backdrop-filter: blur(16px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);

    min-height: 5rem;
}

/* Logo */

.site-header__logo {
    flex-shrink: 0;

    color: var(--color-text-primary);
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.05em;
}

.site-header__logo span {
    color: var(--color-purple);
}

/* Navigation */

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

.site-header__nav a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);

    transition: color var(--duration-base) var(--ease-ui);
}

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

/* Services dropdown */

.site-header__dropdown {
    position: relative;
}

.site-header__dropdown-heading {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.site-header__dropdown-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 28px;
    height: 28px;
    padding: 0;

    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-secondary);

    cursor: pointer;
    transition: color var(--duration-base) var(--ease-ui);
}

.site-header__dropdown-toggle:hover,
.site-header__dropdown-toggle:focus-visible {
    color: var(--color-purple);
}

.site-header__dropdown-toggle svg {
    transition: transform var(--duration-base) var(--ease-ui);
}

.site-header__dropdown-toggle[aria-expanded="true"] svg {
    transform: rotate(180deg);
}

.site-header__submenu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 110;

    display: flex;
    flex-direction: column;
    gap: var(--space-2);

    min-width: 260px;
    padding: var(--space-3);
    margin-top: 0;

    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface-1);
    box-shadow: 0 20px 40px rgb(0 0 0 / 0.25);
}

.site-header__submenu[hidden] {
    display: none;
}

.site-header__submenu a {
    display: block;
    padding: var(--space-3);
    border-radius: var(--radius-sm);

    color: var(--color-text-secondary);
    font-size: 0.875rem;

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

.site-header__submenu a:hover,
.site-header__submenu a:focus-visible {
    color: var(--color-text-primary);
    background: var(--color-surface-2);
}

/* CTA */

.site-header__cta {
    flex-shrink: 0;
}

/* Mobile toggle */

.site-header__toggle {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;

    width: 44px;
    height: 44px;

    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface-1);

    cursor: pointer;
}

.site-header__toggle span {
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--color-text-primary);
}

/* ========================================
   HEADER / MOBILE
   ======================================== */

@media (max-width: 1023px) {
    .site-header__inner {
        min-height: 4.5rem;
    }

    .site-header__toggle {
        display: flex;
    }

    .site-header__cta {
        display: none;
    }

    .site-header__nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;

        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;

        padding: var(--space-6);
        border-bottom: 1px solid var(--color-border);
        background: var(--color-surface-1);

        box-shadow: 0 20px 40px rgb(0 0 0 / 0.25);
    }

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

    .site-header__nav a {
        padding: var(--space-4);
        font-size: 1rem;
    }

    /* Services dropdown / mobile */

    .site-header__dropdown {
        width: 100%;
    }

    .site-header__dropdown-heading {
        justify-content: space-between;
        gap: var(--space-3);
    }

    .site-header__dropdown-link {
        flex: 1;
    }

    .site-header__dropdown-toggle {
        flex-shrink: 0;
        width: 44px;
        height: 44px;
    }

    .site-header__submenu {
        position: static;

        min-width: 0;
        width: 100%;
        margin-top: var(--space-2);
        padding: 0 0 0 var(--space-4);

        border: 0;
        border-left: 1px solid var(--color-border);
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-header__submenu a {
        padding: var(--space-3);
        font-size: 0.875rem;
    }
}