/* =========================================================
   Custom Products — Section 3 architecture layers
   ========================================================= */

.nx-app-arch {
    --nx-bg: #07080A;
    --nx-text: #F5F7FA;
    --nx-text-muted: #9299A5;
    --nx-border: rgba(255, 255, 255, 0.08);
    --nx-accent: #4F7CFF;
    --nx-content: 1320px;
    --nx-pad: clamp(1.25rem, 4vw, 4rem);
    background: var(--nx-bg);
    color: var(--nx-text);
    padding: clamp(5rem, 12vh, 8.5rem) 0;
    border-top: 1px solid var(--nx-border);
    overflow-x: clip;
}

.nx-app-arch__inner {
    width: 100%;
    max-width: var(--nx-content);
    margin: 0 auto;
    padding: 0 var(--nx-pad);
}

body.nx-app-page .nx-app-arch h2 {
    margin: 0 0 0.85rem;
    max-width: 16ch;
    font-family: var(--font-display, 'Syne', sans-serif);
    font-size: clamp(2.1rem, 4.2vw, 3.6rem);
    line-height: 1.05;
    letter-spacing: -0.035em;
}

.nx-app-arch header p:last-child {
    margin: 0 0 clamp(2rem, 5vw, 3rem);
    max-width: 36rem;
    font-family: var(--font-body, 'DM Sans', sans-serif);
    color: var(--nx-text-muted);
    line-height: 1.65;
}

.nx-app-layers {
    margin: 0 0 clamp(2rem, 5vw, 3rem);
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
}

.nx-app-layers span {
    display: block;
    margin-bottom: 0.5rem;
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    color: var(--nx-accent);
}

.nx-app-layers b {
    display: block;
    margin-bottom: 0.4rem;
    font-family: var(--font-display, 'Syne', sans-serif);
    font-size: 1.2rem;
    letter-spacing: -0.03em;
}

.nx-app-layers p {
    margin: 0;
    font-family: var(--font-body, 'DM Sans', sans-serif);
    font-size: 0.92rem;
    line-height: 1.55;
    color: var(--nx-text-muted);
}

.nx-app-schema {
    border: 1px solid rgba(79, 124, 255, 0.28);
    background: #0D0F12;
    padding: clamp(1rem, 3vw, 1.4rem);
}

.nx-app-schema__layer {
    padding: 0.95rem 1rem;
    margin-bottom: 0.55rem;
    border: 1px solid var(--nx-border);
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    color: var(--nx-text-muted);
}

.nx-app-schema__layer.is-mid {
    border-color: rgba(79, 124, 255, 0.45);
    background: rgba(79, 124, 255, 0.1);
    color: var(--nx-text);
}

.nx-app-schema__rail {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 0.75rem;
}

.nx-app-schema__rail span {
    padding: 0.28rem 0.55rem;
    border: 1px dashed rgba(255, 255, 255, 0.16);
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #c5d2ff;
}

@media (max-width: 800px) {
    .nx-app-layers { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
    .nx-app-layers { grid-template-columns: 1fr; }
}