.site-header {
    position: fixed;
    top: calc(var(--safe-top) + var(--space-2));
    left: max(var(--space-3), var(--safe-left));
    right: max(var(--space-3), var(--safe-right));
    z-index: var(--z-header);
    background: rgba(15, 31, 28, 0.88);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base), border-color var(--transition-base),
        transform var(--transition-base), background var(--transition-base);
    will-change: transform;
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
    border-color: var(--color-border-strong);
    background: rgba(15, 31, 28, 0.94);
}

.site-header.header--hidden {
    transform: translateY(calc(-100% - var(--space-4)));
}

.site-header__container {
    width: 100%;
    padding: 0 var(--space-4);
}

.site-header__inner {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) 0;
    transition: padding var(--transition-base);
}

.site-header__row {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 2.5rem;
}

.site-header__logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    cursor: pointer;
}

.site-header__logo-link:hover {
    transform: scale(1.02);
    opacity: 0.95;
}

.site-header__logo {
    height: 1.875rem;
    width: auto;
    max-width: 55vw;
    object-fit: contain;
    transition: height var(--transition-base);
}

.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding-top: calc(var(--header-height-mobile) + var(--safe-top) + var(--space-6));
    min-height: 100vh;
    min-height: 100dvh;
}

.page-container {
    width: 100%;
    max-width: var(--max-width-tool);
    margin: 0 auto;
    padding: var(--space-6) var(--space-4) var(--space-10);
}

.page-container--wide {
    max-width: 1400px;
}

.site-footer {
    position: relative;
    z-index: 20;
    width: 100%;
    margin-top: auto;
    background: var(--color-bg-elevated);
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-4) calc(var(--space-4) + var(--safe-bottom));
    flex-shrink: 0;
}

.site-footer__content {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.site-footer__social {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
}

.site-footer__link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: var(--touch-min);
    min-height: var(--touch-min);
    padding: var(--space-2);
    color: var(--color-text-subtle);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast),
        transform var(--transition-fast);
    cursor: pointer;
}

.site-footer__link:hover {
    color: var(--color-text);
    background: rgba(45, 212, 191, 0.1);
    transform: translateY(-2px);
}

.site-footer__link svg {
    width: 1.25rem;
    height: 1.25rem;
}

@media (min-width: 768px) {
    .site-header__container {
        padding: 0 var(--space-5);
    }

    .site-header__logo {
        height: 2.5rem;
    }

    .main-wrapper {
        padding-top: calc(var(--header-height-desktop) + var(--safe-top) + var(--space-8));
    }

    .page-container {
        padding: var(--space-8) var(--space-6) var(--space-10);
    }
}

@media (min-width: 900px) {
    .site-header__inner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-4);
        padding: var(--space-3) 0;
    }

    .site-header__row {
        min-height: auto;
        flex-shrink: 0;
    }

    .app-nav {
        padding: 0;
        flex: 1;
        justify-content: flex-end;
        mask-image: none;
    }
}

@media (min-width: 900px) {
    .main-wrapper {
        padding-top: calc(var(--header-height-desktop) + var(--safe-top) + var(--space-6));
    }
}

@media (max-width: 899px) {
    .site-header.is-scrolled .site-header__inner {
        padding: var(--space-1) 0;
    }

    .site-header.is-scrolled .site-header__logo {
        height: 1.45rem;
    }
}