/* ==========================================================================
   /solutions/branding-identity — "Identity strata" (TKT-0010, concept 1)
   Rose #E11D48 → blush #FDA4AF on ink #0B0709. Plex Sans + Plex Mono.
   Everything is scoped under .nx-si. No global box-sizing; grids use
   minmax(0,1fr); no edge strokes that differ from the other sides, no thin
   bars, no gradient hairlines on card edges (TKT-0009 rules).
   ========================================================================== */
.nx-si {
    --si-rose: #E11D48;
    --si-rose-2: #F43F5E;
    --si-blush: #FDA4AF;
    --si-ink: #0B0709;
    --si-ink-2: #140C0F;
    --si-ink-3: #1C1115;
    --si-text: #F7EEF0;
    --si-muted: rgba(247, 238, 240, .72);
    --si-dim: rgba(247, 238, 240, .5);
    --si-line: rgba(255, 255, 255, .12);
    --si-line-2: rgba(255, 255, 255, .2);
    --si-sans: "IBM Plex Sans", "Plex Sans Fallback", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --si-mono: "IBM Plex Mono", "Plex Mono Fallback", ui-monospace, Menlo, monospace;
    --si-ar: "IBM Plex Sans Arabic", "IBM Plex Sans", sans-serif;
    --si-gut: clamp(16px, 5vw, 72px);
    --si-max: 1280px;
    background: var(--si-ink);
    color: var(--si-text);
    font-family: var(--si-sans);
    overflow-x: clip;
}
.nx-si ::selection { background: var(--si-rose); color: #fff; }
.nx-si h1, .nx-si h2, .nx-si h3, .nx-si p, .nx-si ul, .nx-si ol, .nx-si dl, .nx-si dd, .nx-si figure { margin: 0; }
.nx-si ul, .nx-si ol { padding: 0; list-style: none; }
.nx-si a { color: inherit; }

.nx-si .si-wrap { max-width: var(--si-max); margin: 0 auto; padding: 0 var(--si-gut); }
.nx-si .si-sec { padding: clamp(72px, 9vw, 128px) 0; position: relative; }
.nx-si .si-sec--alt { background: var(--si-ink-2); }

.nx-si .si-head { max-width: 46rem; margin-bottom: clamp(36px, 5vw, 56px); }
.nx-si .si-kicker {
    font-family: var(--si-mono); font-size: 12px; font-weight: 500; letter-spacing: .16em; text-transform: uppercase;
    color: var(--si-blush); margin: 0 0 16px;
}
.nx-si .si-h2 {
    font-family: var(--si-sans); font-weight: 600; letter-spacing: -.025em;
    font-size: clamp(1.9rem, 4.2vw, 3.4rem); line-height: 1.06; color: var(--si-text); margin: 0 0 20px;
}
.nx-si .si-h2--sm { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: 28px; }
.nx-si .si-h3 { font-size: 1.2rem; font-weight: 600; margin: 0 0 16px; }
.nx-si .si-intro { font-size: clamp(1rem, 1.3vw, 1.15rem); line-height: 1.7; color: var(--si-muted); }
.nx-si .si-intro a, .nx-si .si-cost__side a, .nx-si .si-foot a, .nx-si .si-rel a {
    color: var(--si-text); text-decoration: underline; text-decoration-color: var(--si-rose-2); text-underline-offset: 3px;
}
.nx-si .si-intro a:hover, .nx-si .si-cost__side a:hover, .nx-si .si-foot a:hover, .nx-si .si-rel a:hover { color: var(--si-blush); }

/* Buttons */
.nx-si .si-btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.nx-si .si-btn {
    display: inline-flex; align-items: center; min-height: 48px; padding: 0 24px;
    font-family: var(--si-sans); font-weight: 600; font-size: 15px; text-decoration: none;
    border-radius: 12px; border: 1px solid transparent;
    transition: background .25s ease, color .25s ease, border-color .25s ease, transform .25s cubic-bezier(.16, 1, .3, 1);
}
.nx-si .si-btn--solid { background: var(--si-rose); color: #fff; }
.nx-si .si-btn--solid:hover { background: var(--si-blush); color: var(--si-ink); transform: translateY(-2px); }
.nx-si .si-btn--line { border-color: var(--si-line-2); color: var(--si-text); }
.nx-si .si-btn--line:hover { border-color: var(--si-blush); background: rgba(253, 164, 175, .06); }
.nx-si a:focus-visible, .nx-si summary:focus-visible, .nx-si input:focus-visible { outline: 2px solid var(--si-blush); outline-offset: 3px; }

/* ── HERO ─────────────────────────────────────────────────────────────── */
.nx-si .si-hero {
    position: relative;
    padding: clamp(112px, 12vw, 156px) 0 clamp(56px, 7vw, 96px);
    background:
        radial-gradient(55% 60% at 78% 45%, rgba(225, 29, 72, .18), transparent 70%),
        radial-gradient(40% 40% at 10% 0%, rgba(253, 164, 175, .06), transparent 70%),
        var(--si-ink);
}
.nx-si .si-hero__grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: clamp(28px, 4vw, 64px); align-items: center; }
.nx-si .si-crumbs ol { display: flex; flex-wrap: wrap; gap: 8px; font-family: var(--si-mono); font-size: 12px; color: var(--si-dim); margin-bottom: 28px; }
.nx-si .si-crumbs li + li::before { content: "/"; margin-right: 8px; color: var(--si-dim); }
.nx-si .si-crumbs a { text-decoration: none; color: var(--si-muted); }
.nx-si .si-crumbs a:hover { color: var(--si-blush); }
.nx-si .si-eyebrow { font-family: var(--si-mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--si-blush); margin-bottom: 18px; }
.nx-si .si-h1 {
    font-weight: 600; letter-spacing: -.035em; line-height: 1.02;
    font-size: clamp(2.4rem, 5.6vw, 4.6rem); color: var(--si-text); margin-bottom: 24px;
}
.nx-si .si-h1 span { display: block; color: var(--si-blush); }
.nx-si .si-lede { font-size: clamp(1.02rem, 1.35vw, 1.18rem); line-height: 1.7; color: var(--si-muted); max-width: 36em; }
.nx-si .si-sublede { margin-top: 16px; font-size: 15px; line-height: 1.7; color: var(--si-dim); max-width: 36em; }

/* The plate stack. Plates are flattened 2D projections (rotateX on each
   element, no preserve-3d) so stacking is plain z-index — no 3D sorting
   bugs and no overflow from perspective. --fan 0 = stacked (no-JS still),
   1 = fully separated. */
.nx-si .si-stage { position: relative; margin: 0; min-width: 0; }
.nx-si .si-stack {
    --pw: clamp(170px, 21vw, 260px);
    --fan: 0;
    --gap: calc(10px + var(--fan) * 0.24 * var(--pw));
    position: relative;
    height: calc(var(--pw) * 0.72 + 0.96 * var(--pw) + 24px);
    contain: layout;
}
.nx-si .si-plate {
    position: absolute;
    width: var(--pw); height: var(--pw);
    left: calc(42% - var(--pw) / 2);
    top: calc(100% - var(--pw) * 0.5 - var(--pw) * 0.36 - 12px);
    z-index: calc(1 + var(--i));
    transform: translateY(calc(var(--i) * -1 * var(--gap))) rotateX(60deg) rotateZ(-45deg);
    will-change: transform;
}
.nx-si .si-plate__face {
    position: absolute; inset: 0;
    border-radius: 14px;
    border: 1px solid rgba(253, 164, 175, .42);
    background: rgba(225, 29, 72, calc(.10 + var(--i) * .035));
    box-shadow: 0 30px 60px -20px rgba(0, 0, 0, .7), inset 0 0 0 1px rgba(255, 255, 255, .04);
    overflow: hidden;
}
.nx-si .si-plate--5 .si-plate__face { background: rgba(253, 164, 175, .18); border-color: rgba(253, 164, 175, .6); }
/* No on-plate edge labels: on translucent stacked plates they always crossed a
   neighbouring motif (TKT-0010 Brand R5). The leader tags beside the stack name
   each plate instead. */
.nx-si .si-plate__motif { position: absolute; inset: 18% 18% 26% 18%; display: flex; align-items: center; justify-content: center; gap: 6%; flex-wrap: wrap; }
/* motifs (decorative, all uniform outlines or fills) */
.nx-si .m-ring { position: absolute; width: 70%; height: 70%; border-radius: 50%; border: 1px solid rgba(253, 164, 175, .55); }
.nx-si .m-ring--in { width: 38%; height: 38%; }
.nx-si .m-dot { position: absolute; width: 10%; height: 10%; border-radius: 50%; background: var(--si-blush); }
.nx-si .m-type { font-family: var(--si-sans); font-weight: 600; font-size: calc(var(--pw) * 0.2); line-height: 1; color: var(--si-text); }
.nx-si .m-type--ar { font-family: var(--si-ar); color: var(--si-blush); }
.nx-si .m-mark { width: 34%; aspect-ratio: 1; border-radius: 50%; background: var(--si-rose); }
.nx-si .m-mark--sq { border-radius: 8px; background: transparent; border: 1px solid var(--si-blush); }
.nx-si .si-plate__motif--4 { gap: 6%; }
.nx-si .m-sw { width: 26%; aspect-ratio: 1; border-radius: 6px; background: var(--si-rose); }
.nx-si .m-sw:nth-child(2) { background: var(--si-blush); }
.nx-si .m-sw:nth-child(3) { background: #F7EEF0; }
.nx-si .m-sw:nth-child(4) { background: #7F1D35; }
.nx-si .m-sw:nth-child(5) { background: #3B0A18; }
.nx-si .m-sw:nth-child(6) { background: #FB7185; }
.nx-si .m-tp { display: block; border-radius: 6px; background: rgba(247, 238, 240, .9); }
.nx-si .m-tp--card { width: 30%; height: 20%; }
.nx-si .m-tp--phone { width: 16%; height: 46%; background: var(--si-blush); border-radius: 8px; }
.nx-si .m-tp--sign { width: 36%; height: 30%; background: var(--si-rose); }

/* 2D leader tags on the right of the stack (desktop/tablet) */
.nx-si .si-tags { position: absolute; inset: 0; pointer-events: none; }
.nx-si .si-tags li {
    position: absolute;
    left: calc(42% + var(--pw) * 0.74);
    top: calc(100% - var(--pw) * 0.36 - 12px - 10px);
    transform: translateY(calc(var(--i) * -1 * var(--gap)));
    font-family: var(--si-mono); font-size: 12px; color: var(--si-muted); white-space: nowrap;
    display: flex; align-items: center; gap: 8px;
}
.nx-si .si-tags li b { color: var(--si-blush); font-weight: 500; }
.nx-si .si-stage__cap { margin-top: 14px; text-align: center; font-family: var(--si-mono); font-size: 12px; color: var(--si-dim); }

/* Reduced motion: a static fan (no scrubbing). */
@media (prefers-reduced-motion: reduce) {
    .nx-si .si-stack { --fan: 1 !important; }
    .nx-si .si-plate, .nx-si .si-tags li { transition: none !important; }
}

/* ── STRATA (anatomy) ─────────────────────────────────────────────────── */
.nx-si .si-strata { display: grid; gap: 10px; counter-reset: none; }
.nx-si .si-stratum {
    display: grid;
    grid-template-columns: minmax(0, 96px) minmax(0, 1fr) minmax(0, 300px);
    gap: clamp(16px, 3vw, 40px);
    padding: clamp(22px, 3vw, 36px);
    border-radius: 18px;
    border: 1px solid var(--si-line);
    background: rgba(225, 29, 72, calc(.16 - var(--d) * .028));
    margin-left: calc((4 - var(--d)) * 14px);
}
.nx-si .si-stratum__depth { display: flex; flex-direction: column; gap: 4px; }
.nx-si .si-stratum__lbl { font-family: var(--si-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--si-dim); }
.nx-si .si-stratum__n { font-family: var(--si-mono); font-size: clamp(2rem, 3.4vw, 2.8rem); font-weight: 500; line-height: 1; color: var(--si-blush); }
.nx-si .si-stratum__body h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); font-weight: 600; letter-spacing: -.01em; margin-bottom: 12px; }
.nx-si .si-stratum__body h3 small { display: block; margin-top: 4px; font-family: var(--si-mono); font-size: 12px; font-weight: 400; letter-spacing: .06em; text-transform: uppercase; color: var(--si-blush); }
.nx-si .si-stratum__body p { font-size: 15.5px; line-height: 1.75; color: var(--si-muted); max-width: 40em; }
.nx-si .si-stratum__out { display: flex; flex-wrap: wrap; align-content: flex-start; gap: 8px; }
.nx-si .si-stratum__out li {
    font-size: 13px; line-height: 1.3; padding: 8px 12px; border-radius: 999px;
    border: 1px solid var(--si-line-2); background: rgba(11, 7, 9, .45); color: var(--si-text);
}

/* ── DECISION PANEL ───────────────────────────────────────────────────── */
.nx-si .si-dec { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.nx-si .si-dec__col { margin: 0; padding: clamp(20px, 3vw, 32px); border: 1px solid var(--si-line); border-radius: 18px; background: var(--si-ink-3); min-width: 0; }
.nx-si .si-dec__col legend { float: left; width: 100%; padding: 0; margin: 0 0 16px; font-family: var(--si-mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--si-blush); }
.nx-si .si-dec__col label {
    clear: both; display: flex; gap: 12px; align-items: flex-start; cursor: pointer;
    padding: 14px; margin-top: 8px; border-radius: 12px; border: 1px solid var(--si-line);
    font-size: 15px; line-height: 1.5; color: var(--si-text); transition: background .2s ease, border-color .2s ease;
}
.nx-si .si-dec__col label:hover { background: rgba(255, 255, 255, .03); }
.nx-si .si-dec__col label:has(input:checked) { border-color: rgba(253, 164, 175, .55); background: rgba(225, 29, 72, .1); }
.nx-si .si-dec__col input { flex: none; width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--si-rose); }
.nx-si .si-dec__out { grid-column: 1 / -1; padding: clamp(20px, 3vw, 32px); border-radius: 18px; border: 1px solid var(--si-line); background: var(--si-ink); }
.nx-si .si-scale { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 14px; align-items: center; font-family: var(--si-mono); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--si-muted); }
.nx-si .si-scale__track { position: relative; height: 12px; border-radius: 999px; background: rgba(255, 255, 255, .08); }
.nx-si .si-scale__dot {
    --lean: 0;
    position: absolute; top: 50%; left: calc(50% + var(--lean) * 50%);
    width: 22px; height: 22px; margin: -11px 0 0 -11px; border-radius: 50%;
    background: var(--si-rose); box-shadow: 0 0 0 6px rgba(225, 29, 72, .22);
    transition: left .5s cubic-bezier(.16, 1, .3, 1);
}
.nx-si .si-dec__read { display: block; margin-top: 18px; font-size: 1.2rem; font-weight: 600; color: var(--si-text); }
.nx-si .si-dec__note { margin-top: 8px; font-size: 14.5px; line-height: 1.65; color: var(--si-muted); max-width: 52em; }
.nx-si .si-scale { display: none; }
.nx-si.si-js .si-scale { display: grid; }

/* ── PROOF ────────────────────────────────────────────────────────────── */
.nx-si .si-proof { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.nx-si .si-case { display: flex; flex-direction: column; border-radius: 18px; border: 1px solid var(--si-line); background: var(--si-ink-2); overflow: hidden; min-width: 0; }
.nx-si .si-case img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; background: var(--si-ink-3); }
.nx-si .si-case__body { display: flex; flex-direction: column; gap: 12px; padding: 22px; flex: 1; }
.nx-si .si-case__meta { display: flex; flex-wrap: wrap; gap: 8px 20px; font-family: var(--si-mono); font-size: 11.5px; }
.nx-si .si-case__meta dt { color: var(--si-dim); text-transform: uppercase; letter-spacing: .1em; }
.nx-si .si-case__meta dd { color: var(--si-blush); }
.nx-si .si-case h3 { font-size: 1.35rem; font-weight: 600; }
.nx-si .si-case p { font-size: 15px; line-height: 1.7; color: var(--si-muted); }
.nx-si .si-case__lesson { padding: 14px; border-radius: 12px; background: rgba(225, 29, 72, .1); color: var(--si-text) !important; }
.nx-si .si-case__lesson b { color: var(--si-blush); }
.nx-si .si-case__more { margin-top: auto; font-weight: 600; font-size: 14.5px; text-decoration: none; color: var(--si-text); }
.nx-si .si-case__more:hover { color: var(--si-blush); }
.nx-si .si-foot { margin-top: 28px; font-size: 15px; line-height: 1.7; color: var(--si-muted); }

/* ── OPTIONS & COST ───────────────────────────────────────────────────── */
.nx-si .si-opts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.nx-si .si-opt { display: flex; flex-direction: column; gap: 12px; padding: clamp(22px, 3vw, 30px); border-radius: 18px; border: 1px solid var(--si-line); background: var(--si-ink-3); min-width: 0; }
.nx-si .si-opt__for { font-family: var(--si-mono); font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--si-dim); }
.nx-si .si-opt h3 { font-size: 1.4rem; font-weight: 600; letter-spacing: -.01em; }
.nx-si .si-opt__layers { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nx-si .si-opt__layers i { width: 16px; height: 16px; border-radius: 5px; border: 1px solid var(--si-line-2); background: transparent; }
.nx-si .si-opt__layers i.is-on { background: var(--si-rose); border-color: var(--si-rose); }
.nx-si .si-opt__layers span { margin-left: 6px; font-family: var(--si-mono); font-size: 12px; color: var(--si-blush); }
.nx-si .si-opt p { font-size: 15px; line-height: 1.7; color: var(--si-muted); }
.nx-si .si-opt .si-opt__time { margin-top: auto; color: var(--si-text); font-weight: 500; }
.nx-si .si-cost { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(24px, 5vw, 72px); margin-top: clamp(40px, 5vw, 64px); }
.nx-si .si-ticks li { position: relative; padding: 10px 0 10px 28px; font-size: 15.5px; line-height: 1.55; color: var(--si-text); }
.nx-si .si-ticks li::before { content: ""; position: absolute; left: 0; top: 15px; width: 12px; height: 12px; border-radius: 50%; background: var(--si-rose); }
.nx-si .si-cost__side p { font-size: 15.5px; line-height: 1.75; color: var(--si-muted); }
.nx-si .si-cost__side p + p { margin-top: 16px; }

/* ── BUILDING ORDER ───────────────────────────────────────────────────── */
.nx-si .si-order { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
.nx-si .si-order li { padding: 22px; border-radius: 16px; border: 1px solid var(--si-line); background: var(--si-ink-2); min-width: 0; }
.nx-si .si-order__n {
    display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 50%;
    background: rgba(225, 29, 72, calc(.12 + 0.0 * 1)); color: var(--si-blush);
    font-family: var(--si-mono); font-weight: 500; margin-bottom: 18px;
}
.nx-si .si-order li:nth-child(1) .si-order__n { background: rgba(225, 29, 72, .5); color: #fff; }
.nx-si .si-order li:nth-child(2) .si-order__n { background: rgba(225, 29, 72, .4); color: #fff; }
.nx-si .si-order li:nth-child(3) .si-order__n { background: rgba(225, 29, 72, .3); }
.nx-si .si-order li:nth-child(4) .si-order__n { background: rgba(225, 29, 72, .2); }
.nx-si .si-order h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.nx-si .si-order p { font-size: 14.5px; line-height: 1.65; color: var(--si-muted); }
.nx-si .si-own { margin-top: 24px; font-family: var(--si-mono); font-size: 13px; color: var(--si-blush); }

/* ── FAQ ──────────────────────────────────────────────────────────────── */
.nx-si .si-faq-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: clamp(28px, 5vw, 80px); align-items: start; }
.nx-si .si-faq { display: grid; gap: 10px; }
.nx-si .si-faq details { border-radius: 14px; border: 1px solid var(--si-line); background: var(--si-ink); }
.nx-si .si-faq details[open] { background: var(--si-ink-3); }
.nx-si .si-faq summary {
    list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 16px; align-items: center;
    padding: 18px 20px; font-size: 16.5px; font-weight: 600; line-height: 1.4; color: var(--si-text);
}
.nx-si .si-faq summary::-webkit-details-marker { display: none; }
.nx-si .si-faq summary::after { content: "+"; flex: none; font-family: var(--si-mono); font-size: 1.3rem; color: var(--si-blush); transition: transform .3s ease; }
.nx-si .si-faq details[open] summary::after { transform: rotate(45deg); }
.nx-si .si-faq details p { padding: 0 20px 20px; font-size: 15px; line-height: 1.75; color: var(--si-muted); max-width: 44em; }

/* ── RELATED ──────────────────────────────────────────────────────────── */
.nx-si .si-rel { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.nx-si .si-rel__card { padding: 22px; border-radius: 16px; border: 1px solid var(--si-line); background: var(--si-ink-2); min-width: 0; }
.nx-si .si-rel__card--local { background: rgba(225, 29, 72, .14); border-color: rgba(253, 164, 175, .3); }
.nx-si .si-rel__card .si-kicker { margin-bottom: 10px; }
.nx-si .si-rel__card p, .nx-si .si-rel__card li { font-size: 15px; line-height: 1.65; color: var(--si-muted); }
.nx-si .si-rel__card li + li { margin-top: 6px; }

/* ── CTA ──────────────────────────────────────────────────────────────── */
.nx-si .si-cta { padding: 0 0 clamp(72px, 9vw, 120px); }
.nx-si .si-cta__inner > * { position: relative; }
.nx-si .si-cta__inner {
    padding-top: clamp(40px, 6vw, 72px); padding-bottom: clamp(40px, 6vw, 72px);
    border-radius: 24px;
    background: radial-gradient(80% 120% at 0% 0%, #F43F5E, #9F1239 60%, #4C0519);
    max-width: calc(var(--si-max) - 2 * var(--si-gut));
    margin: 0 auto;
}
.nx-si .si-cta h2 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 600; letter-spacing: -.02em; color: #fff; max-width: 16em; }
.nx-si .si-cta p { margin-top: 14px; font-size: 16px; line-height: 1.7; color: rgba(255, 255, 255, .86); max-width: 38em; }
.nx-si .si-cta .si-btn--solid { background: #fff; color: #4C0519; }
.nx-si .si-cta .si-btn--solid:hover { background: var(--si-blush); }
.nx-si .si-cta .si-btn--line { border-color: rgba(255, 255, 255, .5); color: #fff; }

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
    .nx-si .si-order { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .nx-si .si-rel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
    .nx-si .si-hero__grid { grid-template-columns: minmax(0, 1fr); }
    .nx-si .si-stack { --pw: clamp(150px, 40vw, 240px); }
    .nx-si .si-stratum { grid-template-columns: minmax(0, 72px) minmax(0, 1fr); margin-left: 0; }
    .nx-si .si-stratum__out { grid-column: 2; }
    .nx-si .si-proof, .nx-si .si-opts { grid-template-columns: minmax(0, 1fr); }
    .nx-si .si-proof { max-width: 640px; }
    .nx-si .si-cost, .nx-si .si-faq-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
    .nx-si .si-dec { grid-template-columns: minmax(0, 1fr); }
    .nx-si .si-order { grid-template-columns: minmax(0, 1fr); }
    .nx-si .si-order li { display: grid; grid-template-columns: 40px minmax(0, 1fr); column-gap: 16px; }
    .nx-si .si-order__n { grid-row: span 2; margin: 0; }
}
@media (max-width: 560px) {
    .nx-si .si-plate { left: calc(38% - var(--pw) / 2); }
    .nx-si .si-tags li { left: calc(38% + var(--pw) * 0.72); font-size: 10.5px; }
    .nx-si .si-tags li b { display: none; }
    .nx-si .si-stratum { grid-template-columns: minmax(0, 1fr); gap: 14px; }
    .nx-si .si-stratum__depth { flex-direction: row; align-items: baseline; gap: 10px; }
    .nx-si .si-stratum__out { grid-column: auto; }
    .nx-si .si-rel { grid-template-columns: minmax(0, 1fr); }
    .nx-si .si-cta__inner { border-radius: 0; }
}

/* CLS: reserve the shared header logo's width before the PNG decodes. The <img> in
   includes/header/menu.php has no width/height; logo-light.png is 118 x 125. */
img.nx-nav__logo { aspect-ratio: 118 / 125; }