/* ===========================
   GUT — Layout (Header, Nav, Footer)
   =========================== */

/* ---------- HEADER ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--color-dark);
    transition: background-color var(--transition-base);
}

.site-header .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-lg);
    max-width: 1400px;
    margin: 0 auto;
}

/* Logo */
.site-logo {
    font-family: var(--font-display);
    font-size: 3rem;
    color: var(--color-white);
    letter-spacing: 0.05em;
    line-height: 1;
    transition: opacity var(--transition-fast);
}

.site-logo:hover {
    opacity: 0.8;
}

/* Desktop Navigation */
.nav-desktop {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--color-text-light);
    letter-spacing: 0.05em;
    position: relative;
    padding-bottom: 2px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover {
    opacity: 1;
    color: var(--color-white);
}

/* Social icons in header */
.header-socials {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.social-icon:hover {
    opacity: 0.7;
    transform: translateY(-2px);
}

.social-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ---------- HAMBURGER (mobile) ---------- */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    z-index: 1100;
}

.hamburger-btn span {
    display: block;
    width: 28px;
    height: 2px;
    background-color: var(--color-white);
    margin: 6px 0;
    transition: transform var(--transition-base), opacity var(--transition-fast);
    border-radius: 2px;
}

/* Hamburger open state */
.hamburger-btn.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger-btn.open span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ---------- MOBILE NAV OVERLAY ---------- */
.nav-mobile {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-dark);
    z-index: 1050;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.nav-mobile.open {
    display: flex;
    opacity: 1;
}

.nav-mobile .nav-link {
    font-size: 3rem;
    color: var(--color-white);
}

.nav-mobile .mobile-socials {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.nav-mobile .social-icon {
    width: 36px;
    height: 36px;
}

/* ---------- FOOTER ---------- */
.site-footer {
    background-color: var(--color-dark);
    padding: var(--space-xl) 0;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
}

.footer-socials {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.footer-socials .social-icon {
    width: 32px;
    height: 32px;
}

.footer-socials .social-icon img {
    filter: brightness(0) invert(1);
}

.footer-text {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

/* ---------- BODY OFFSET for fixed header ---------- */
body {
    padding-top: var(--header-height);
}

/* ---------- RESPONSIVE ---------- */
@media screen and (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .nav-desktop,
    .header-socials {
        display: none;
    }

    .hamburger-btn {
        display: block;
    }

    .site-header .header-inner {
        padding: 0 var(--space-md);
    }

    .site-logo {
        font-size: 2.4rem;
    }
}