/* Tab Navigation Header */
.header {
    background: var(--color-primary);
    padding: 1.2rem var(--space-lg);
    border-bottom: 4px solid var(--color-accent);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-lg);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

.roundel {
    width: 45px;
    height: 45px;
    background: var(--color-accent);
    border-radius: 50%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.roundel::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 6px;
    background: var(--color-primary);
}

.roundel-text {
    color: white;
    font-size: 1.3rem;
    font-weight: 700;
    z-index: 1;
    background: var(--color-accent);
    padding: 0 0.3rem;
}

.logo-text {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
}

/* Tabs Navigation */
.tabs-nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tab-button, .section-link {
    background: transparent;
    color: white;
    border: 2px solid transparent;
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 6px;
    transition: all 0.3s;
    text-transform: capitalize;
}

.tab-button:hover, .section-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.tab-button-active, .section-link-active {
    background: transparent;
    color: white;
    border-bottom: 3px solid var(--color-accent);
}

/* Page Container */
.pages-container {
    min-height: calc(100vh - 80px);
}

.page-content {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.page-content-active {
    display: block;
}

/* Developer Page Overlay */
.developer-page {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background: white;
    z-index: 999;
}

.developer-page.page-content-active {
    display: flex;
    flex-direction: column;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .tabs-nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .tab-button, .section-link {
        font-size: 0.9rem;
        padding: 0.5rem 0.8rem;
    }
}