/* ==========================================
   Header Styles
   ========================================== */

.site-header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    z-index: var(--z-header);
    transition: background-color var(--transition-base), border-color var(--transition-base);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-container {
    max-width: var(--max-width-container);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

/* ==========================================
   Logo Section
   ========================================== */

.logo-section {
    flex-shrink: 0;
}

.logo {
    height: 60px;
    width: auto;
    display: block;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

/* ==========================================
   Navigation
   ========================================== */

.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
}

.main-nav li {
    margin: 0;
}

.main-nav a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
    position: relative;
}

.main-nav a:hover {
    color: var(--color-accent-primary);
    background-color: var(--color-bg-tertiary);
}

.main-nav a.active {
    color: var(--color-accent-primary);
    font-weight: 600;
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-ember-red), var(--color-ember-coral));
    border-radius: 2px;
}

/* ==========================================
   Header Actions
   ========================================== */

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

/* ==========================================
   Social Links
   ========================================== */

.social-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.social-link:hover {
    color: var(--color-accent-primary);
    background-color: var(--color-bg-tertiary);
    transform: translateY(-2px);
}

/* ==========================================
   Theme Toggle
   ========================================== */

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
    position: relative;
}

.theme-toggle:hover {
    background-color: var(--color-accent-primary);
    color: white;
    transform: scale(1.05);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-toggle svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

/* Default: show sun in dark mode, moon in light mode */
.sun-icon {
    opacity: 0;
}

.moon-icon {
    opacity: 1;
}

@media (prefers-color-scheme: dark) {
    .sun-icon {
        opacity: 1;
    }

    .moon-icon {
        opacity: 0;
    }
}

/* Manual theme overrides */
[data-theme="light"] .sun-icon {
    opacity: 0;
}

[data-theme="light"] .moon-icon {
    opacity: 1;
}

[data-theme="dark"] .sun-icon {
    opacity: 1;
}

[data-theme="dark"] .moon-icon {
    opacity: 0;
}

/* ==========================================
   Mobile Menu Toggle
   ========================================== */

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 1024px) {
    .main-nav ul {
        gap: var(--spacing-sm);
    }

    .main-nav a {
        padding: var(--spacing-xs);
        font-size: var(--font-size-xs);
    }

    .social-links {
        gap: var(--spacing-xs);
    }

    .social-link {
        width: 32px;
        height: 32px;
    }

    .social-link svg {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
    }

    .main-nav {
        order: 3;
        flex-basis: 100%;
        margin-top: var(--spacing-sm);
    }

    .main-nav ul {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }

    .main-nav a {
        font-size: var(--font-size-xs);
        padding: 6px 10px;
    }

    .main-nav a.active::after {
        display: none;
    }

    .logo {
        height: 48px;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .social-links {
        display: none;
    }

    .header-container {
        padding: 0 var(--spacing-sm);
    }

    .main-nav ul {
        gap: 4px;
    }

    .main-nav a {
        padding: 4px 8px;
    }
}