/* ========================================================
   INDUSTRIAL GEOMETRIC TEXT NAVIGATION SYSTEM
   ======================================================== */
.article-nav-section {
    position: fixed;
    right: 4.5rem;
    bottom: 4.5rem;
    display: flex;
    flex-direction: row; /* Aligns BACK and NEXT side-by-side like the reference image */
    gap: 1.5rem;
    z-index: 500;
}

.article-nav-button {
    position: relative;
    height: 48px;
    padding: 0 2.25rem;
    background: transparent; /* Clean slate transparency until hover sweep triggers */
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 50px; /* Rounded pill style matching settings controls */
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    overflow: hidden; /* Clips the background color sweep edge lines cleanly */
    transition: border-color var(--t) ease, transform var(--t) ease, box-shadow var(--t) ease;
}

/* --- THE MECHANICAL COLOR SWEEP ENGINE --- */
.article-nav-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    
    /* Dynamically fills using your established theme variables */
    background-color: var(--accent); 
    border-radius: inherit; /* Ensure background sweep is also rounded */
    
    z-index: 1;
    transform: scaleX(0); /* Starts completely collapsed on the left edge */
    transform-origin: left center; /* Enforces absolute left-to-right fill tracking */
    transition: transform 350ms cubic-bezier(0.25, 1, 0.5, 1);
}

/* --- HOVER INTERACTION OVERRIDES --- */
.article-nav-button:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* Fires the left-to-right solid color fill animation */
.article-nav-button:hover::before {
    transform: scaleX(1);
}

.article-nav-button:active {
    transform: translateY(0) scale(0.98);
}

/* --- TEXT AND COMPONENT DECORATION STYLING --- */
.nav-btn-text {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: #ffffff !important;
    position: relative;
    z-index: 2; /* Pushes text layer cleanly above the sliding color sweep plane */
    transition: color 250ms ease;
}

/* Changes text to black if your active theme color is light (matches yellow button reference) */
.article-nav-button:hover .nav-btn-text {
    color: #000000 !important;
}

/* Subtle architectural graphic indicator line inside buttons */
.nav-btn-line {
    width: 16px;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.6);
    position: relative;
    z-index: 2;
    transition: all 250ms ease;
}

.article-nav-button:hover .nav-btn-line {
    background-color: #000000;
    width: 24px; /* Extends slightly on hover for an adaptive tactile feedback response */
}

/* ========================================================
   RESPONSIVE DESIGN (Mobile & Tablet)
   ======================================================== */
@media (max-width: 1024px) {
    .article-nav-section {
        right: 0 !important;
        left: 0 !important;
        bottom: 1.5rem !important;
        justify-content: center !important;
        padding: 0 1rem !important;
        gap: 0.75rem !important;
    }
    
    .article-nav-button {
        padding: 0 1rem !important;
        flex: 1 !important; /* Equal width buttons */
        height: 44px !important;
    }
    
    .nav-btn-text {
        font-size: 0.7rem !important;
        letter-spacing: 1px !important;
        text-align: center !important;
        white-space: normal !important;
        line-height: 1.1 !important;
    }
}