/* =========================================================
   MATH BACKGROUND
   Canvas fixed full-viewport di belakang seluruh halaman.
   Opacity rendah agar tidak mengganggu keterbacaan konten.
   ========================================================= */

.math-bg-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.55;
    color: rgb(42, 140, 127);
}

/* Canvas khusus di dalam semua hero (latar gelap): absolute,
   di ATAS latar gradient/foto tapi di BAWAH konten hero */
.math-bg-hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.8;
}

/* Bibliography hero tidak punya latar gelap sendiri —
   beri latar gelap agar simbol glow menyala kontras */
.bibliography-hero {
    position: relative;
    overflow: hidden;
    background: rgb(16, 11, 11);
}
.bibliography-hero h1{
    position: relative;
    overflow: hidden;
    color:  rgb(42, 140, 127);
}
.bibliography-eyebrow {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #7FD8CD;
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: .18em;
    text-transform: uppercase;
    background: rgba(42, 140, 127, 0);
    border: 1px solid rgba(127, 216, 205, .3);
    padding: 7px 14px;
    border-radius: 0px;
    backdrop-filter: blur(4px);
}
.bibliography-hero .container,
.bibliography-hero ,
.bibliography-hero .bibliography-hero-text {
    position: relative;
    z-index: 1;
    padding:8px;
    color: white;
}

.hero > .container,
.hero > .hero-grid {
    position: relative;
    z-index: 1;
    
}

/* Category-hero sudah punya .container relative (navier-bg.css).
   Pastikan teks hero tetap terbaca di atas canvas glow. */
.category-hero > .container {
    z-index: 1;
}

/* Footer: canvas di atas latar gradient gelap, konten di atasnya.
   Footer butuh position anchor untuk canvas absolute. */
.site-footer {
    position: relative;
    overflow: hidden;
}

.site-footer > .container {
    position: relative;
    z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
    .math-bg-canvas,
    .math-bg-hero-canvas {
        display: none;
    }
}