/* ========================================
   NAVBAR
   ======================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-header);
    width: 100%;

}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;

    width: min(
        calc(100% - (2 * var(--container-padding-mobile))),
        var(--container-max-width)
    );

    min-height: 80px;
    margin-inline: auto;

    background-color: rgba(var(--color-background), 0);
    backdrop-filter: blur(15px);
}


/* ========================================
   LOGO
   ======================================== */

.navbar__logo {
    color: var(--color-text-primary);

    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.03em;

    transition: color var(--transition-normal);
    display: flex;
    justify-content: center;
    align-items: center;
}

.navbar__logo:hover {
    color: var(--color-primary);
}


.navbar__logo img {
    width: 3rem;
}


/* ========================================
   MENU
   ======================================== */

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

.navbar__menu a {
    position: relative;

    color: var(--color-text-secondary);

    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);

    transition: color var(--transition-normal);
}

.navbar__menu a::after {
    content: "";

    position: absolute;
    left: 0;
    bottom: -6px;

    width: 100%;
    height: 2px;

    background: var(--color-primary);

    transform: scaleX(0);
    transform-origin: right;

    transition: transform var(--transition-normal);
}

.navbar__menu a:hover {
    color: var(--color-primary);
}

.navbar__menu a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}


/* ========================================
   THEME TOGGLE
   ======================================== */

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

    width: 42px;
    height: 42px;

    border: var(--border-width-thin) solid var(--color-border);
    border-radius: var(--radius-full);

    background: var(--color-surface);
    color: var(--color-text-primary);

    box-shadow: var(--shadow-sm);

    transition:
        color var(--transition-normal),
        background-color var(--transition-normal),
        border-color var(--transition-normal),
        transform var(--transition-normal),
        box-shadow var(--transition-normal);
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);

    transform: rotate(12deg);
    box-shadow: var(--shadow-md);
}


/* ========================================
   MOBILE TOGGLE
   ======================================== */

.navbar__toggle {
    display: none;

    flex-direction: column;
    justify-content: center;
    gap: 5px;

    width: 42px;
    height: 42px;

    border: var(--border-width-thin) solid var(--color-border);
    border-radius: var(--radius-md);

    background: var(--color-surface);
}

.navbar__toggle span {
    display: block;

    width: 18px;
    height: 2px;

    margin-inline: auto;

    border-radius: var(--radius-full);

    background: var(--color-text-primary);

    transition:
        transform var(--transition-normal),
        opacity var(--transition-normal);
}

.navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* ========================================
   TABLET
   ======================================== */

@media (min-width: 768px) {

    .navbar {
        width: min(
            calc(100% - (2 * var(--container-padding-tablet))),
            var(--container-max-width)
        );
    }
}


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

@media (max-width: 767px) {

    .navbar {
        position: relative;

        min-height: 72px;
    }

    .navbar__menu {
        position: absolute;

        top: calc(100% + var(--space-3));
        left: 0;
        right: 0;

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

        gap: 0;

        padding: var(--space-3);

        border: var(--border-width-thin) solid var(--color-border);
        border-radius: var(--radius-lg);

        background: var(--color-surface);

        box-shadow: var(--shadow-lg);
    }

    .navbar__menu.is-open {
        display: flex;
    }

    .navbar__menu a {
        padding: var(--space-3) var(--space-4);

        border-radius: var(--radius-md);
    }

    .navbar__menu a:hover {
        background: var(--color-surface-elevated);
    }

    .navbar__menu a::after {
        display: none;
    }

    .navbar__toggle {
        display: flex;
    }
}