.site-header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    z-index: 100;
}

.header-brand {
    position: relative;
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    transition: color 0.2s ease;
}

.header-brand:hover {
    color: var(--color-hover);
}

.header-brand::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: currentColor;
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.header-brand:hover::after {
    transform: scaleX(1);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 50px;
}

.header-nav {
    display: flex;
    gap: 50px;
}

.header-nav a {
    position: relative;
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    text-transform: uppercase;
    transition: color 0.2s ease;
}

.header-nav a:hover {
    color: var(--color-hover);
}

/* Underline grows in from the left on hover, shrinks back toward the left
   (i.e. its right edge retreats) on unhover — single left-anchored origin. */
.header-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: currentColor;
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.header-nav a:hover::after {
    transform: scaleX(1);
}

/* Hamburger button — hidden on desktop */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger-btn svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-text);
    stroke-width: 2;
    fill: none;
    display: block;
}

.hamburger-btn .icon-close         { display: none; }
.hamburger-btn.open .icon-hamburger { display: none; }
.hamburger-btn.open .icon-close     { display: block; }

/* Mobile dropdown menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--color-background);
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    padding: 24px 32px;
    z-index: 99;
    border-top: 1px solid #333;
}

.mobile-menu.open { display: flex; }

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-nav a {
    position: relative;
    display: inline-block;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    text-transform: uppercase;
}

.mobile-nav a:hover {
    color: var(--color-hover);
}

.mobile-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: currentColor;
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.mobile-nav a:hover::after {
    transform: scaleX(1);
}

@media (max-width: 768px) {
    .header-right  { display: none; }
    .hamburger-btn { display: block; }
}