/**
 * Cupcake 2048 - Global Navigation (Header & Footer)
 * 
 * Implements the Compact Mobile-First Sticky Header and the Legitimacy Footer.
 */

.site-header-2048 {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 64px;
    display: flex;
    align-items: center;
    transition: transform var(--motion-duration-base) var(--motion-ease-standard);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* 1. Brand Block */
.brand-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.brand-name {
    font-weight: 800;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

/* 2. High-Intent Nav */
.nav-list {
    display: flex;
    gap: var(--spacing-6);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list a {
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text-secondary);
    transition: color var(--motion-duration-fast);
}

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

/* 3. Sovereignty HUD */
.sovereignty-hud {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    padding: var(--spacing-1) var(--spacing-4);
    border-radius: var(--radius-full);
}

.header-utility {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.hud-signal {
    font-size: var(--font-size-xs);
    font-weight: 900;
    color: var(--color-brand);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hud-value {
    font-family: monospace;
    font-weight: 800;
    color: var(--color-text-primary);
}

/* 4. Appearance Toggle Re-positioning */
#appearance-toggle {
    /* Anchored to header flow on desktop, mobile can stay floating or move */
    position: static; 
    margin-left: var(--spacing-4);
}

[data-theme="light"] .site-header-2048 {
    background-color: var(--color-surface-elevated);
}

/* 6. Mobile Responsiveness */
@media screen and (max-width: 768px) {
    .site-header-2048 {
        height: auto;
        padding: var(--spacing-4) 0;
    }

    .header-container {
        flex-direction: column;
        gap: var(--spacing-4);
    }

    .nav-list {
        gap: var(--spacing-4);
        flex-wrap: wrap;
        justify-content: center;
    }

    .header-utility {
        width: 100%;
        justify-content: center;
    }
}

@media screen and (max-width: 480px) {
    .brand-name {
        font-size: var(--font-size-md);
    }
    
    .nav-list {
        gap: var(--spacing-3);
    }
    
    .nav-list a {
        font-size: 11px;
    }
    
    .sovereignty-hud {
        padding: 2px 8px;
    }
}

/* === FOOTER LEGITIMACY STACK === */

.site-footer-2048 {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-16) 0 var(--spacing-8);
    transition: background-color var(--motion-duration-base);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-16);
}

.footer-title {
    font-size: var(--font-size-xs);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-6);
}

.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-3);
}

.footer-links a {
    text-decoration: none;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--motion-duration-fast);
}

.footer-links a:hover {
    color: var(--color-brand);
}

.footer-text {
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-text-secondary);
}

.nap-block {
    display: block;
    margin-top: var(--spacing-4);
    font-style: normal;
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* Footer Bottom Bar */
.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-8);
}

.bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.copyright, .build-info {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    opacity: 0.6;
}

/* Mode Overrides */
[data-theme="light"] .site-footer-2048 {
    background-color: var(--color-surface-elevated);
}

/* Responsiveness */
@media screen and (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-8);
    }
}

@media screen and (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .bottom-content {
        flex-direction: column;
        align-items: flex-start;
    }
}