/* Header Styles */
.header {
    position: sticky;
    top: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: var(--z-header);
    padding: var(--spacing-md) 0;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.logo-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.logo-fallback {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: white;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.version-tag {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    opacity: 0.6;
    margin-left: 0.5rem;
    padding: 0.15rem 0.4rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--spacing-xs);
}

.nav-link {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-block;
    font-family: var(--font-family);
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.nav-link.active {
    color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 0.5rem 0;
    }
    
    .header-container {
        padding: 0 0.75rem;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
    }

    .logo-text {
        font-size: var(--font-size-base);
    }

    .nav {
        gap: 0.25rem;
    }

    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
        min-height: 40px; /* Touch-friendly */
    }
}

/* Extra small mobile */
@media (max-width: 374px) {
    .logo-text {
        font-size: var(--font-size-sm);
    }
    
    .nav-link {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
    }
}