.scanline {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.03) 2px,
        rgba(0, 0, 0, 0.03) 4px
    );
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-sm) var(--space-lg);
    gap: var(--space-lg);
    height: 56px;
}

.site-branding {
    flex-shrink: 0;
}

.logo-img {
    height: 32px;
    width: auto;
}

.logo-light {
    display: none;
}

.logo-dark {
    display: block;
}

[data-theme="light"] .logo-light {
    display: block;
}

[data-theme="light"] .logo-dark {
    display: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    color: var(--color-gray);
}

.theme-toggle:hover {
    border-color: var(--color-green);
    background-color: var(--color-bg-hover);
    color: var(--color-green);
}

.theme-toggle-icon--dark {
    display: none;
}

.theme-toggle-icon--light {
    display: block;
}

[data-theme="light"] .theme-toggle-icon--dark {
    display: block;
}

[data-theme="light"] .theme-toggle-icon--light {
    display: none;
}

.theme-toggle-label {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: inherit;
}

@media (max-width: 768px) {
    .theme-toggle-label {
        display: none;
    }
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 18px;
    height: 2px;
    background-color: var(--color-green);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    position: absolute;
}

.nav-toggle-icon {
    top: 50%;
    transform: translateY(-50%);
}

.nav-toggle-icon::before {
    content: '';
    top: -5px;
}

.nav-toggle-icon::after {
    content: '';
    top: 5px;
}

.nav-toggle.active .nav-toggle-icon {
    background-color: transparent;
}

.nav-toggle.active .nav-toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .nav-toggle-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

.site-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    gap: 0;
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    display: flex;
    align-items: center;
    height: 56px;
    padding: 0 var(--space-md);
    color: var(--color-gray);
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast), background-color var(--transition-fast);
    border-bottom: 2px solid transparent;
}

.nav-menu a:hover,
.nav-menu .current-menu-item > a {
    color: var(--color-green);
    border-bottom-color: var(--color-green);
}

.nav-menu .current-menu-item > a {
    background-color: var(--color-bg-hover);
}

.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xs) 0;
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

.mobile-nav .nav-menu {
    display: flex;
    justify-content: space-around;
    padding: 0;
}

.mobile-nav .nav-menu a {
    flex-direction: column;
    height: auto;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.6rem;
    text-align: center;
    border-bottom: none;
    gap: 2px;
}

.mobile-nav .nav-icon {
    font-size: 1.2rem;
    display: block;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        display: none;
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-bg);
        overflow-y: auto;
        padding: var(--space-md) 0;
        z-index: 999;
    }

    .site-nav.active {
        display: block;
    }

    .site-nav .nav-menu {
        flex-direction: column;
        padding: 0 var(--space-lg);
        gap: 0;
    }

    .site-nav .nav-menu a {
        height: auto;
        padding: var(--space-md) var(--space-sm);
        font-size: 1rem;
        border-bottom: 1px solid var(--color-border);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .site-nav .nav-menu a::after {
        content: '>';
        color: var(--color-green-dim);
        font-size: 0.8rem;
    }

    .site-nav .nav-menu a:hover::after,
    .site-nav .nav-menu .current-menu-item > a::after {
        color: var(--color-green);
    }

    .mobile-nav {
        display: block;
    }
}

@media (max-width: 480px) {
    .header-inner {
        padding: var(--space-sm) var(--space-md);
        gap: var(--space-sm);
    }

    .header-actions {
        gap: var(--space-xs);
    }

    .theme-toggle {
        padding: 4px 8px;
    }
}