.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: transparent;
    transition: background 0.3s var(--ease-smooth), padding 0.3s var(--ease-smooth);
}

.site-header .logo {
    height: 40px;
    width: auto;
    transition: transform 0.3s var(--ease-smooth);
}

.site-header .logo:hover {
    transform: scale(1.05);
}

.site-header.header--light {
    color: var(--color-black);
}

.site-header.header--light.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 4rem;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.site-header.header--dark {
    color: var(--color-white);
}

.site-header.header--dark .logo {
    filter: invert(1);
}

.site-header.header--dark.scrolled {
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    padding: 1rem 4rem;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.site-header.header--dark .back-link {
    color: var(--color-white);
}

.menu-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    gap: 6px;
    z-index: 1001;
}

.menu-toggle:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
}

.menu-toggle span {
    width: 30px;
    height: 2px;
    background: var(--color-black);
    transition: all 0.3s var(--ease-smooth);
}

.site-header.header--dark .menu-toggle span {
    background: var(--color-white);
}

.menu-toggle span:nth-child(2) {
    width: 24px;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-black);
    z-index: 999;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: max(5.5rem, env(safe-area-inset-top)) 1.5rem max(1.5rem, env(safe-area-inset-bottom));
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s var(--ease-smooth);
}

.menu-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.menu-overlay nav {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
}

.menu-overlay nav ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(0.65rem, 1.6vh, 1.75rem);
    text-align: center;
}

.menu-overlay nav ul li {
    margin: 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.menu-overlay.active nav ul li {
    opacity: 1;
    transform: translateY(0);
}

.menu-overlay nav ul li:nth-child(1) { transition-delay: 0.1s; }
.menu-overlay nav ul li:nth-child(2) { transition-delay: 0.2s; }
.menu-overlay nav ul li:nth-child(3) { transition-delay: 0.3s; }
.menu-overlay nav ul li:nth-child(4) { transition-delay: 0.4s; }
.menu-overlay nav ul li:nth-child(5) { transition-delay: 0.5s; }
.menu-overlay nav ul li:nth-child(6) { transition-delay: 0.6s; }
.menu-overlay nav ul li:nth-child(7) { transition-delay: 0.7s; }

.menu-link {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 8vw, 4rem);
    line-height: 1.05;
    font-weight: 300;
    color: var(--color-white);
    transition: color 0.3s var(--ease-smooth);
    display: inline-block;
}

.menu-link:hover {
    color: var(--color-gray);
}

.menu-link:focus-visible {
    outline: 2px solid var(--color-white);
    outline-offset: 4px;
}

footer {
    background: var(--color-black);
    color: var(--color-white);
    padding: 6rem 4rem 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: minmax(320px, 2fr) repeat(3, minmax(170px, 1fr));
    gap: 3rem;
    max-width: 1400px;
    margin: 0 auto;
    align-items: start;
}

.footer-logo {
    height: 60px;
    width: auto;
    margin-bottom: 2rem;
    filter: invert(1);
}

.footer-text {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--color-gray);
}

.footer-social {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    margin-top: 1.25rem;
}

.footer-social-link {
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-gray);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: color 0.3s var(--ease-smooth), border-color 0.3s var(--ease-smooth), background 0.3s var(--ease-smooth), transform 0.3s var(--ease-smooth);
}

.footer-social-link svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.footer-social-link:hover {
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.footer-links h4 {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.footer-links ul li {
    margin-bottom: 0.75rem;
}

.footer-links ul li a {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-gray);
    transition: color 0.3s var(--ease-smooth);
}

.footer-links ul li a:hover {
    color: var(--color-white);
}

.footer-links-seo {
    text-align: left;
}

.footer-seo-links {
    display: grid;
    gap: 0.65rem;
    justify-items: start;
}

.footer-seo-links li {
    margin-bottom: 0;
}

.footer-seo-links li a {
    display: inline-block;
    font-size: 0.82rem;
    line-height: 1.35;
    letter-spacing: 0.01em;
    color: #d6d6d6;
}

.footer-seo-links li a:hover {
    color: var(--color-white);
}

.footer-bottom {
    max-width: 1400px;
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--color-gray);
}

.developed-by {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.4);
}

.aumatex-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: transform 0.3s var(--ease-smooth);
}

.aumatex-link:hover {
    transform: scale(1.1);
}

.aumatex-logo {
    height: 14px;
    width: auto;
    opacity: 0.5;
    transition: opacity 0.3s var(--ease-smooth);
}

.aumatex-link:hover .aumatex-logo {
    opacity: 0.8;
}

main > section:not(.hero) {
    padding: 8rem 4rem;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}

main > section:not(.hero).visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 8rem);
    font-weight: 300;
    letter-spacing: -0.02em;
    line-height: 1;
    margin-bottom: 3rem;
}

.section-subtitle {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-gray);
    margin-bottom: 1rem;
}

@media (max-width: 1024px) {
    .site-header {
        padding: 1.5rem 2rem;
    }
    
    main > section:not(.hero) {
        padding: 6rem 2rem;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 3rem;
    }

    .footer-links-seo {
        text-align: left;
    }

    .footer-seo-links {
        justify-items: start;
    }
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
    }

    .menu-link {
        font-size: clamp(1.85rem, 9vw, 2.7rem);
    }
    
    .section-title {
        font-size: clamp(2rem, 10vw, 4rem);
    }
}

@media (max-height: 760px) {
    .menu-overlay {
        padding-top: max(4.75rem, env(safe-area-inset-top));
        padding-bottom: max(1rem, env(safe-area-inset-bottom));
    }

    .menu-overlay nav ul {
        gap: clamp(0.45rem, 1.2vh, 0.95rem);
    }

    .menu-link {
        font-size: clamp(1.6rem, 6.2vh, 2.6rem);
    }
}