/* =====================================================================
   /device/ : the device chapter
   Colour meaning (shared with /lab/): amber = deuterium / the thing to
   look at, orange = drive and stress, crimson = charge and field,
   purple-ink = electrons, controls and comparisons.
   ===================================================================== */

/* ---------- shared figure frame (sibling of /lab/) ---------- */
.fig { border: 1px solid var(--line); border-radius: 10px; background: var(--bg-deep); overflow: hidden; }
.fig__bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 11px 16px; border-bottom: 1px solid var(--line); font: 500 11.5px/1.3 var(--font-mono); letter-spacing: 0.03em; color: var(--ink-3); text-transform: uppercase; }
.fig__tag { color: var(--amber); }
.fig__name { color: var(--ink-2); text-align: right; }
.fig__cap { padding: 12px 16px 14px; border-top: 1px solid var(--line); font: 400 12px/1.6 var(--font-mono); color: var(--ink-3); }
.fig__cap a { color: var(--ink-2); }

.dv-intro { max-width: 980px; margin-bottom: clamp(40px, 5vw, 72px); }
.dv-intro .display-2 { text-wrap: balance; }
.dv-intro .lead { margin-top: clamp(20px, 2.4vw, 32px); max-width: 56ch; }

/* ---------- 0. hero ---------- */
.dv-hero { padding-block: clamp(20px, 3vw, 40px) clamp(56px, 7vw, 104px); position: relative; }
.dv-hero::before { content: ""; position: absolute; inset: 0 0 auto auto; width: 60%; height: 90%; background: radial-gradient(50% 50% at 70% 40%, rgba(235, 91, 0, 0.16), transparent 70%); pointer-events: none; z-index: -1; }
.dv-hero__grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr); gap: clamp(28px, 4vw, 72px); align-items: start; }
.dv-hero__text { padding-top: clamp(8px, 2vw, 28px); }
.dv-hero__h1 { font-size: clamp(64px, 8.8vw, 138px); margin-top: clamp(12px, 1.6vw, 24px); }
.dv-hero__lead { font: 400 clamp(20px, 1.7vw, 25px)/1.36 var(--font-text); letter-spacing: -0.014em; color: var(--ink); max-width: 34ch; margin-top: clamp(24px, 2.6vw, 40px); text-wrap: pretty; }
.dv-hero__honest { font: 400 14px/1.6 var(--font-mono); color: var(--ink-2); max-width: 48ch; margin-top: 22px; padding-left: 14px; border-left: 2px solid var(--amber); }
.dv-spec { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); margin-top: clamp(28px, 3vw, 44px); border-top: 1px solid var(--line-2); }
.dv-spec a { display: grid; gap: 6px; padding: 16px 10px 4px 0; text-decoration: none; }
.dv-spec b { font: 400 clamp(40px, 3.8vw, 60px)/0.9 var(--font-display); letter-spacing: var(--track-display); color: var(--ink); transition: color 0.2s; }
.dv-spec span { font: 400 11px/1.3 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; }
.dv-spec a:hover b { color: var(--amber); }
.dv-hero__fig { margin: 0; justify-self: end; width: 100%; }
.dv-hero__media { position: relative; margin: 0; border-radius: 10px; overflow: hidden; aspect-ratio: 4 / 5; max-height: calc(100vh - 150px); width: 100%; background: var(--bg-deep); }
.dv-hero__cap { font: 400 12px/1.6 var(--font-mono); color: var(--ink-3); margin-top: 12px; max-width: 60ch; }
.dv-hero__cap .chip { margin-left: 4px; }
.dv-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.dv-hero__fallback { position: absolute; inset: 0; background: radial-gradient(60% 50% at 50% 70%, var(--orange), var(--purple) 60%, var(--bg-deep)); }
.dv-callout { position: absolute; font: 500 11px/1 var(--font-mono); letter-spacing: 0.04em; color: #fff; background: rgba(18, 18, 18, 0.72); padding: 6px 8px; border-radius: 3px; white-space: nowrap; -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.dv-callout::before { content: ""; position: absolute; top: 50%; width: 34px; height: 1px; background: rgba(255, 255, 255, 0.6); }
.dv-callout--horn { top: 44%; left: 58%; }
.dv-callout--horn::before { right: 100%; }
.dv-callout--flange { top: 24%; left: 4%; }
.dv-callout--flange::before { left: 100%; }
.dv-callout--slurry { top: 74%; right: 6%; }
.dv-callout--slurry::before { right: 100%; }

/* ---------- 1. mechanism (signature) ---------- */
.dv-how { padding-block: var(--section-pad) clamp(48px, 6vw, 96px); }
.mx { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr); gap: clamp(32px, 5vw, 88px); align-items: start; }
.mx__figwrap { position: sticky; top: calc(var(--header-h) + 18px); }
.mx__fig { background: var(--bg-deep); }
.mx__bar { display: flex; align-items: center; gap: 14px; padding: 10px 14px; border-bottom: 1px solid var(--line); font: 500 11.5px/1 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; }
.mx__ticks { display: flex; gap: 4px; margin-inline: auto; }
.mx__tick { display: grid; place-items: center; min-width: 38px; height: 28px; border-radius: 3px; border: 1px solid var(--line); font: 500 11px/1 var(--font-mono); color: var(--ink-3); transition: color 0.25s, background 0.25s, border-color 0.25s; }
.mx__tick:hover { color: var(--ink); border-color: var(--line-2); }
.mx__tick.is-on { color: #121212; background: var(--amber); border-color: var(--amber); }
.mx__tick.is-done { color: var(--ink-2); border-color: color-mix(in srgb, var(--amber) 40%, transparent); }
.mx__scale { min-width: 72px; text-align: right; text-transform: none; }
.mx__stage { position: relative; width: min(100%, calc(100vh - 210px)); aspect-ratio: 1; margin-inline: auto; overflow: hidden; }
.mx-scene { width: 100%; height: 100%; }
.mx__fig .fig__cap { font-size: 11.5px; }

/* text inside the drawing; sizes are in drawing units (scaled with the figure) */
.mx-t { font-family: var(--font-mono); fill: var(--ink-2); }
.mx-t--k { font-size: 12.5px; letter-spacing: 0.04em; fill: var(--ink-3); }
.mx-t--v { font: 400 46px var(--font-display); letter-spacing: -0.045em; fill: var(--ink); }
.mx-t--d { font: 400 15px var(--font-text); fill: var(--ink-2); }
.mx-t--s { font-size: 12px; fill: var(--ink-2); }
.mx-t--tag { font-size: 12.5px; letter-spacing: 0.05em; fill: #fff; paint-order: stroke; stroke: #121212; stroke-width: 4px; stroke-linejoin: round; }
.mx-t--p { font: italic 400 22px var(--font-display); fill: #fff; }
.mx-t--ion { font-size: 12.5px; letter-spacing: 0.05em; fill: var(--amber-ink); }
.mx-t--sea { font-size: 12.5px; letter-spacing: 0.05em; fill: #f2d4f6; paint-order: stroke; stroke: #2a1030; stroke-width: 4px; }

/* field scene */
.mx-carrier { fill: #1c171d; stroke: var(--line); }
.mx-g--hyd circle:first-child { fill: url(#mxMetal); }
.mx-dots { fill: url(#mxD); opacity: 0.5; }
.mx-g--piezo polygon { fill: url(#mxPz); stroke: rgba(255, 77, 131, 0.5); stroke-width: 1; }
.mx-pol { fill: none; stroke: #fff; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; opacity: 0.85; }
.mx-g { transition: opacity 0.6s var(--ease); }
.mx-g circle:first-child, .mx-g polygon { transition: stroke 0.5s, stroke-width 0.5s; }
.mx-chain { fill: none; stroke: #ff7a2e; stroke-width: 5; stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 0 5px rgba(235, 91, 0, 0.9)); stroke-dasharray: 1; stroke-dashoffset: 0; }
.mx-shear line { stroke: #ff7a2e; stroke-width: 3; }
.mx-zoom circle { fill: none; stroke: var(--amber); stroke-width: 2.5; stroke-dasharray: 6 5; }
.mx-zoom line { stroke: var(--amber); stroke-width: 1.5; }
.mx-scale line { stroke: var(--ink-2); stroke-width: 1.5; }

/* contact scene */
.mx-atom { fill: #7c7c7c; }
.mx-dl { fill: var(--amber); }
.mx-hyd-edge { display: none; }
.mx-parrow { stroke: #e0e0e0; stroke-width: 3; }
.mx-squeeze line { stroke: #ff7a2e; stroke-width: 4; }
.mx-plus text { font: 700 26px var(--font-display); fill: #fff; }
.mx-minus text { font: 700 26px var(--font-display); fill: #ffc3d5; }
.mx-gapdim line { stroke: var(--ink-2); stroke-width: 1.5; }
.mx-field path { fill: none; stroke: #ff4d83; stroke-width: 1.8; stroke-dasharray: 5 4; marker-end: url(#mxArrC); }
.mx-trail { stroke: var(--amber); stroke-width: 2; stroke-dasharray: 2 4; opacity: 0.7; }
.mx-ion circle { fill: var(--amber); filter: drop-shadow(0 0 6px rgba(255, 178, 0, 0.9)); }
.mx-ion text { font: 700 15px var(--font-display); fill: #121212; }
.mx-lead { stroke: var(--amber-ink); stroke-width: 1; opacity: 0.7; }
.mx-elec circle { fill: #f6d9fa; }
.mx-hit { fill: none; stroke: var(--amber); stroke-width: 2.5; transform-box: fill-box; transform-origin: center; }
.mx-axis { stroke: var(--line-2); stroke-width: 1.2; }
.mx-wall { stroke: var(--ink-3); stroke-width: 1.2; stroke-dasharray: 2 3; }
.mx-bare { fill: none; stroke: #9a9a9a; stroke-width: 2.4; }
.mx-scr { fill: none; stroke: var(--amber); stroke-width: 3; }
.mx-e { stroke: #fff; stroke-width: 1.4; stroke-dasharray: 5 4; opacity: 0.8; }
.mx-tp--bare { fill: #9a9a9a; }
.mx-tp--scr { fill: var(--amber); }

/* state machine: JS sets data-step on .mx; no-JS shows everything */
.mx-lay, .mx-ro { transition: opacity 0.55s var(--ease); }
.js .mx[data-step] .mx-lay, .js .mx[data-step] .mx-ro { opacity: 0; }
.js .mx[data-step="1"] .mx-ro--1,
.js .mx[data-step="2"] .mx-ro--2,
.js .mx[data-step="3"] .mx-ro--3,
.js .mx[data-step="4"] .mx-ro--4,
.js .mx[data-step="5"] .mx-ro--5,
.js .mx[data-step="2"] .mx-lay--2,
.js .mx[data-step="3"] .mx-lay--3,
.js .mx[data-step="4"] .mx-lay--3,
.js .mx[data-step="4"] .mx-lay--4,
.js .mx[data-step="5"] .mx-lay--4,
.js .mx[data-step="5"] .mx-lay--5 { opacity: 1; }
.js .mx[data-step="5"] .mx-lay--3 { opacity: 0.5; }
.js .mx[data-step] .mx-chain { stroke-dashoffset: 1; transition: stroke-dashoffset 1.4s var(--ease-out); }
.js .mx[data-step="2"] .mx-chain { stroke-dashoffset: 0; }
.js .mx[data-step="2"] .mx-chain--1 { transition-delay: 0.12s; }
.js .mx[data-step="2"] .mx-chain--2 { transition-delay: 0.24s; }
.js .mx[data-step="2"] .mx-chain--3 { transition-delay: 0.36s; }
.js .mx[data-step="2"] .mx-g:not(.is-chain) { opacity: 0.42; }
.js .mx[data-step="2"] .mx-g.is-chain circle:first-child, .js .mx[data-step="2"] .mx-g.is-chain polygon { stroke: #ff7a2e; stroke-width: 2; }
.js .mx[data-step="2"] .mx-g.is-target circle:first-child, .js .mx[data-step="2"] .mx-g.is-target polygon { stroke: var(--amber); stroke-width: 2.5; }
/* zoom between the two scales */
.js .mx[data-step] .mx__stage .mx-scene { position: absolute; inset: 0; transform-origin: 59.2% 26.8%; transition: opacity 0.6s var(--ease), transform 0.95s var(--ease-out); }
.js .mx[data-step] .mx-scene--contact { opacity: 0; transform: scale(0.16); pointer-events: none; }
.js .mx[data-step="3"] .mx-scene--field, .js .mx[data-step="4"] .mx-scene--field, .js .mx[data-step="5"] .mx-scene--field { opacity: 0; transform: scale(5); pointer-events: none; }
.js .mx[data-step="3"] .mx-scene--contact, .js .mx[data-step="4"] .mx-scene--contact, .js .mx[data-step="5"] .mx-scene--contact { opacity: 1; transform: none; pointer-events: auto; }
/* no-JS: both scales stacked, every layer shown, one readout per scene */
.no-js .mx__stage { aspect-ratio: auto; display: grid; gap: 1px; }
.no-js .mx-ro--1, .no-js .mx-ro--3, .no-js .mx-ro--4 { display: none; }

/* motion that explains: the deuteron accelerates across the gap (ease-in = speeding up) */
@media (prefers-reduced-motion: no-preference) {
  .js .mx[data-step="4"] .mx-ion, .js .mx[data-step="5"] .mx-ion { animation: mx-throw 1.6s cubic-bezier(0.55, 0, 0.9, 0.4) infinite; }
  .js .mx[data-step="4"] .mx-field path, .js .mx[data-step="5"] .mx-field path { animation: mx-flow 0.9s linear infinite; }
  .js .mx[data-step="5"] .mx-hit { animation: mx-pulse 1.6s ease-out infinite; }
  .js .mx[data-step="2"] .mx-chains { animation: mx-burst 1.4s ease-in-out 1.6s infinite; }
}
@keyframes mx-burst { 0%, 100% { opacity: 1; } 50% { opacity: 0.45; } }
@keyframes mx-throw { 0% { transform: translateX(0); opacity: 0; } 10% { opacity: 1; } 78% { transform: translateX(48px); opacity: 1; } 100% { transform: translateX(52px); opacity: 0; } }
@keyframes mx-flow { to { stroke-dashoffset: -18; } }
@keyframes mx-pulse { 0% { transform: scale(0.7); opacity: 1; } 100% { transform: scale(1.6); opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .mx-scene, .mx-lay, .mx-ro, .mx-chain, .mx-g { transition: none !important; }
  .mx-ion { transform: translateX(24px); }
}

/* steps */
.mx__steps { display: grid; padding-bottom: 12vh; }
.mx-step { min-height: 78vh; display: flex; flex-direction: column; justify-content: center; padding-block: 6vh; max-width: 520px; transition: opacity 0.4s var(--ease); }
.js .mx[data-step] .mx-step { opacity: 0.28; }
.js .mx[data-step] .mx-step.is-on { opacity: 1; }
.mx-step__n { font: 500 12.5px/1 var(--font-mono); color: var(--amber); text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 18px; }
.mx-step__h { font: 400 clamp(30px, 3vw, 46px)/1.02 var(--font-display); letter-spacing: -0.035em; text-wrap: balance; }
.mx-step__p { font: 400 17.5px/1.62 var(--font-text); color: var(--ink-2); margin-top: 18px; text-wrap: pretty; }
.mx-step__facts { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.mx-step__facts li { font: 400 13px/1.55 var(--font-mono); color: var(--ink-2); padding: 10px 0; border-bottom: 1px solid var(--line); }
.mx-step__facts b { display: block; font-weight: 500; color: var(--ink); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 2px; }
.mx-step .chips { margin-top: 18px; }
.mx-step__close { margin-top: 26px; font: 400 clamp(20px, 1.7vw, 25px)/1.3 var(--font-display); letter-spacing: -0.02em; color: var(--amber-ink); }

/* ---------- 2. composition matrix ---------- */
.cm { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 64px); align-items: start; }
.cm__gridwrap { display: grid; gap: 12px; }
.cm__axis { font: 500 11px/1.3 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.04em; }
.cm__axis--x { padding-left: calc(25% + 6px); }
.cm__grid { display: grid; grid-template-columns: minmax(84px, 1.15fr) repeat(4, minmax(0, 1fr)); gap: 6px; }
.cm__corner { display: flex; flex-direction: column; justify-content: flex-end; gap: 4px; font: 400 10.5px/1.2 var(--font-mono); color: var(--ink-3); text-transform: uppercase; padding-bottom: 6px; }
.cm__colh, .cm__rowh { display: grid; align-content: end; gap: 6px; padding: 6px 2px; }
.cm__rowh { align-content: center; padding-right: 8px; }
.cm__name { font: 400 clamp(18px, 1.6vw, 24px)/1 var(--font-display); letter-spacing: -0.03em; color: var(--ink); white-space: nowrap; }
.cm__colh .cm__name { font-size: clamp(14px, 1.15vw, 18px); letter-spacing: -0.02em; }
.cm__val { font: 400 11px/1 var(--font-mono); color: var(--ink-3); }
.cm__bar { display: block; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.cm__bar i { display: block; height: 100%; width: max(var(--v), 2px); background: var(--crimson-ink); border-radius: 3px; }
.cm__bar--dm i { background: var(--amber); }
.cm__bar--dm.is-h i { background: repeating-linear-gradient(90deg, var(--ink-3) 0 3px, transparent 3px 5px); }
.cm__cell { position: relative; aspect-ratio: 1 / 0.86; border-radius: 6px; display: flex; align-items: flex-end; padding: 8px; text-align: left; transition: transform 0.25s var(--ease), box-shadow 0.25s, filter 0.25s; min-height: 48px; }
.cm__cell:hover { filter: brightness(1.15); }
.cm__cell.is-on { box-shadow: 0 0 0 3px var(--bg), 0 0 0 5px #fff; transform: scale(1.03); z-index: 1; }
.cm__tag { font: 500 10px/1.1 var(--font-mono); letter-spacing: 0.04em; }
.cm__cell--active { background: var(--orange); color: var(--on-orange); }
.cm__cell--ref { background: var(--amber); color: var(--on-amber); }
.cm__cell--low { background: var(--purple); color: var(--purple-ink); }
.cm__cell--iso { background: repeating-linear-gradient(135deg, #3a3a3a 0 6px, #2a2a2a 6px 12px); color: var(--ink-2); }
.cm__cell--double { background: repeating-linear-gradient(135deg, #3d1239 0 6px, #262626 6px 12px); color: var(--purple-ink); }
.cm__legend { display: flex; flex-wrap: wrap; gap: 8px 18px; list-style: none; padding: 0; margin: 6px 0 0; font: 400 11.5px/1 var(--font-mono); color: var(--ink-2); }
.cm__lg { display: flex; align-items: center; gap: 8px; }
.cm__lg::before { content: ""; width: 14px; height: 14px; border-radius: 3px; }
.cm__lg--active::before { background: var(--orange); }
.cm__lg--ref::before { background: var(--amber); }
.cm__lg--low::before { background: var(--purple); }
.cm__lg--iso::before { background: repeating-linear-gradient(135deg, #5a5a5a 0 3px, #2a2a2a 3px 6px); }
.cm__axis--y { display: none; }

.cm__panel { padding: clamp(22px, 2.4vw, 34px); position: sticky; top: calc(var(--header-h) + 24px); }
.cm__pair { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font: 500 13px/1 var(--font-mono); color: var(--paper-ink-2); }
.cm__roletag { font: 500 10.5px/1 var(--font-mono); letter-spacing: 0.05em; padding: 5px 7px; border-radius: 3px; background: var(--purple); color: #fff; }
.cm__panel .card-paper__title { font-size: clamp(26px, 2.4vw, 38px); margin-top: 14px; }
.cm__why { font: 400 16px/1.55 var(--font-text); color: var(--paper-ink); margin-top: 12px; max-width: 52ch; }
.cm__mats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--paper-line); }
.cm__mat[hidden] { display: none; }
.cm__matk { font: 500 10.5px/1.3 var(--font-mono); color: var(--purple); letter-spacing: 0.04em; }
.cm__matn { font: 400 26px/1 var(--font-display); letter-spacing: -0.03em; margin-top: 8px; color: var(--paper-ink); }
.cm__matn span { display: block; font: 400 12px/1.4 var(--font-mono); color: var(--paper-ink-2); letter-spacing: 0; margin-top: 4px; }
.cm__matwhy { font: 400 13px/1.55 var(--font-mono); color: var(--paper-ink-2); margin-top: 10px; }
.cm__facts { margin: 14px 0 0; display: grid; gap: 0; }
.cm__facts div { padding: 7px 0; border-top: 1px solid var(--paper-line); }
.cm__facts dt { font: 600 10.5px/1.3 var(--font-mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--paper-ink); }
.cm__facts dd { margin: 2px 0 0; font: 400 12.5px/1.5 var(--font-mono); color: var(--paper-ink-2); }
.cm__chips { margin-top: 20px; }
.cm__panel .chip { color: var(--paper-ink-2); border-color: var(--paper-line); }
.cm__panel .chip__arrow { color: var(--purple); }
.cm__panel .chip:hover { color: var(--paper-ink); border-color: var(--purple); background: rgba(100, 13, 95, 0.06); }
.cm__panel .est { color: var(--paper-ink-2); border-color: var(--paper-line); }

/* expandable source detail, shared on this page */
.dv-more { margin-top: clamp(28px, 3vw, 44px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dv-more summary { display: flex; align-items: baseline; gap: 14px; padding: 18px 0; cursor: pointer; list-style: none; font: 400 15px/1.4 var(--font-text); color: var(--ink-2); }
.dv-more summary::-webkit-details-marker { display: none; }
.dv-more summary::after { content: "+"; margin-left: auto; font: 400 22px/1 var(--font-display); color: var(--purple-ink); }
.dv-more[open] summary::after { content: "−"; }
.dv-more summary:hover { color: var(--ink); }
.dv-more__k { font: 500 11.5px/1 var(--font-mono); color: var(--purple-ink); white-space: nowrap; }
.dv-more__body { padding-bottom: 28px; max-width: none; }
.dv-more__body h3:first-child { margin-top: 0.4em; }

/* ---------- 3. carriers ---------- */
.cf { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: clamp(14px, 2vw, 28px); align-items: stretch; }
.cf__cell { display: grid; grid-template-rows: auto 1fr; }
.cf__cell > svg, .cf__svg { width: 100%; max-width: 330px; margin: 18px auto 0; }
.cf__vs { display: grid; place-items: center; }
.cf__vs span { font: 400 clamp(28px, 3vw, 44px)/1 var(--font-display); letter-spacing: -0.04em; color: var(--ink-3); }
.cf__spec { margin: 0; padding: 6px 18px 18px; display: grid; }
.cf__spec div { padding: 10px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 80px 1fr; gap: 14px; }
.cf__spec dt { font: 500 10.5px/1.5 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--amber-ink); }
.cf__spec dd { margin: 0; font: 400 14.5px/1.5 var(--font-text); color: var(--ink-2); }
.cf-steel { fill: #6c6c6c; }
.cf-wall { fill: rgba(255, 255, 255, 0.03); stroke: #bdbdbd; stroke-width: 2.5; }
.cf-horn { fill: #a8a8a8; }
.cf-wave path { fill: none; stroke: #ff7a2e; stroke-width: 2; }
.cf-sapphire { fill: rgba(213, 139, 224, 0.55); stroke: #d58be0; }
.cf-gas { fill: none; stroke: var(--amber); stroke-width: 2.5; }
.cf-well { fill: #3a3a3a; stroke: #5a5a5a; }
.cf-clamp { fill: #9a9a9a; }
.cf-basket { fill: none; stroke: #bdbdbd; stroke-width: 1.5; stroke-dasharray: 4 3; }
.cf-electrode { fill: #b5b5b5; }
.cf-spark path { fill: none; stroke: #ff4d83; stroke-width: 2.5; stroke-linejoin: round; filter: drop-shadow(0 0 4px rgba(217, 22, 86, 0.9)); }
.cf-stack rect { fill: var(--crimson); }
.cf-relief { fill: var(--bg-deep); stroke: var(--amber); stroke-width: 2; }
.cf-t text { font: 400 11.5px var(--font-mono); fill: var(--ink-2); letter-spacing: 0.03em; paint-order: stroke; stroke: var(--bg-deep); stroke-width: 4px; stroke-linejoin: round; }
.cf-t .cf-t--dim { fill: var(--ink-3); font-size: 10.5px; }
.cf__rule { margin-top: clamp(32px, 4vw, 56px); display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 16px clamp(28px, 4vw, 64px); align-items: start; }
.cf__rule > .chips { grid-column: 2; }
.cf__rulep { font: 400 clamp(22px, 2vw, 30px)/1.2 var(--font-display); letter-spacing: -0.025em; text-wrap: balance; }
.cf__rows { list-style: none; padding: 0; margin: 0; }
.cf__row { display: grid; grid-template-columns: 64px 1fr; gap: 18px; align-items: center; padding: 16px 0; border-top: 1px solid var(--line); }
.cf__row:last-child { border-bottom: 1px solid var(--line); }
.cf__row b { display: block; font: 400 20px/1.2 var(--font-display); letter-spacing: -0.02em; }
.cf__row div span { display: block; font: 400 14.5px/1.55 var(--font-text); color: var(--ink-2); margin-top: 4px; }
.cf__field { display: flex; flex-direction: column; gap: 5px; }
.cf__field i { display: block; height: 4px; border-radius: 2px; }
.cf__field--full i { background: #ff4d83; }
.cf__field--burst i { background: repeating-linear-gradient(90deg, #ff4d83 0 6px, transparent 6px 14px); }

/* ---------- 4. knobs ---------- */
.kn-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(20px, 2.6vw, 40px); }
.kn { padding: 24px 0 26px; border-top: 1px solid var(--line-2); display: flex; flex-direction: column; }
.kn__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.kn__code { font: 400 clamp(44px, 4vw, 64px)/0.9 var(--font-display); letter-spacing: var(--track-display); color: var(--amber); }
.kn__glyph { width: 56px; height: 56px; flex: none; }
.kn__title { font: 400 clamp(22px, 1.9vw, 28px)/1.1 var(--font-display); letter-spacing: -0.03em; margin-top: 18px; text-wrap: balance; }
.kn__plain { font: 400 16.5px/1.55 var(--font-text); color: var(--ink-2); margin-top: 10px; flex: 1; }
.kn__more { margin-top: 16px; }
.kn__more summary { cursor: pointer; list-style: none; display: inline-flex; align-items: center; gap: 10px; font: 500 12px/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-2); padding: 9px 12px; border: 1px solid var(--line-2); border-radius: 3px; transition: border-color 0.2s, color 0.2s; }
.kn__more summary::-webkit-details-marker { display: none; }
.kn__more summary::after { content: "+"; font-size: 15px; color: var(--amber); }
.kn__more[open] summary::after { content: "−"; }
.kn__more summary:hover { color: var(--ink); border-color: var(--amber); }
.kn__more p { font: 400 14.5px/1.6 var(--font-text); color: var(--ink-2); margin-top: 10px; }
.kn__more .kn__label { font: 500 11px/1 var(--font-mono); color: var(--amber-ink); margin-top: 18px; letter-spacing: 0.04em; }
.kn__more .kn__label--drive { color: var(--orange-ink); }
.kn__more a { color: var(--ink); text-decoration-color: var(--orange); }
.kn__src { font: 400 12.5px var(--font-mono); }

/* ---------- 5. excitation stack ---------- */
.xs__chart { padding: 8px 16px 6px; }
.xs__head, .xs__foot, .xs__lane > summary { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 18px; align-items: center; }
.xs__phases { position: relative; height: 30px; }
.xs__ph { position: absolute; left: calc(var(--a) * 1%); width: calc((var(--b) - var(--a)) * 1%); top: 6px; padding-top: 6px; border-top: 2px solid var(--line-2); font: 500 10.5px/1.1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.xs__ph--on { border-top-color: var(--orange); color: var(--orange-ink); }
.xs__ph--ctl { border-top-color: var(--purple-ink); color: var(--purple-ink); }
.xs__lane { --c: var(--amber); border-top: 1px solid var(--line); }
.xs__lane--orange { --c: #ff7a2e; }
.xs__lane--crimson { --c: #ff4d83; }
.xs__lane--purple { --c: var(--purple-ink); }
.xs__lane > summary { cursor: pointer; list-style: none; padding: 10px 0; }
.xs__lane > summary::-webkit-details-marker { display: none; }
.xs__lane > summary:hover .xs__name { color: var(--ink); }
.xs__label { display: grid; grid-template-columns: 34px 1fr 18px; align-items: center; gap: 10px; }
.xs__code { font: 500 13px/1 var(--font-mono); color: var(--c); }
.xs__name { font: 400 18px/1.2 var(--font-display); letter-spacing: -0.02em; color: var(--ink-2); transition: color 0.2s; }
.xs__plus { justify-self: end; width: 18px; height: 18px; border: 1px solid var(--line-2); border-radius: 50%; position: relative; }
.xs__plus::before, .xs__plus::after { content: ""; position: absolute; left: 4px; right: 4px; top: 8px; height: 1px; background: var(--ink-2); }
.xs__plus::after { transform: rotate(90deg); transition: transform 0.25s; }
.xs__lane[open] .xs__plus::after { transform: rotate(0); }
.xs__trace { position: relative; display: block; height: 60px; }
.xs__trace svg { width: 100%; height: 100%; }
.xs__trace::after { content: ""; position: absolute; top: 0; bottom: 0; left: 76%; right: 0; background: repeating-linear-gradient(135deg, rgba(213, 139, 224, 0.08) 0 6px, transparent 6px 12px); border-left: 1px dashed rgba(213, 139, 224, 0.35); pointer-events: none; }
.xs-fill { fill: var(--c); opacity: 0.16; }
.xs-line { fill: none; stroke: var(--c); stroke-width: 2.2; vector-effect: non-scaling-stroke; stroke-linejoin: round; }
.xs-base { stroke: var(--line-2); stroke-width: 1; vector-effect: non-scaling-stroke; }
.xs-burst { fill: var(--c); opacity: 0.85; }
.xs-shot { stroke: var(--c); stroke-width: 2.4; vector-effect: non-scaling-stroke; }
.xs-win { fill: none; stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 3 3; vector-effect: non-scaling-stroke; }
.xs-win--blind { fill: rgba(255, 255, 255, 0.16); stroke: var(--ink-2); }
.xs__detail { margin: 0 0 18px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; padding: 16px 18px; background: var(--bg-raise); border-left: 2px solid var(--c); border-radius: 0 6px 6px 0; }
.xs__detail dt { font: 500 10.5px/1.3 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--c); }
.xs__detail dd { margin: 6px 0 0; font: 400 14.5px/1.55 var(--font-text); color: var(--ink-2); }
.xs__foot { border-top: 1px solid var(--line); padding: 10px 0 6px; }
.xs__axis { display: flex; justify-content: space-between; gap: 16px; font: 400 10.5px/1.3 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; }
.xs__axis span:last-child { color: var(--purple-ink); text-align: right; max-width: 30ch; }
.xs__key { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 8px; color: var(--ink-2); }
.xs__sw { display: inline-block; width: 16px; height: 12px; border: 1px dashed var(--ink-3); margin-left: 6px; }
.xs__sw:first-child { margin-left: 0; }
.xs__sw--blind { background: rgba(255, 255, 255, 0.16); border-style: solid; border-color: var(--ink-2); }
.xs__rules { margin-top: clamp(32px, 4vw, 56px); display: grid; grid-template-columns: minmax(0, 0.5fr) minmax(0, 1.5fr); gap: 16px clamp(28px, 4vw, 64px); }
.xs__rules > .chips { grid-column: 2; }
.xs__rulelist { list-style: none; padding: 0; margin: 0; counter-reset: r; display: grid; grid-template-columns: 1fr 1fr; gap: 0 32px; }
.xs__rulelist li { counter-increment: r; position: relative; padding: 16px 0 16px 40px; border-top: 1px solid var(--line); font: 400 15px/1.55 var(--font-text); color: var(--ink-2); }
.xs__rulelist li::before { content: counter(r, decimal-leading-zero); position: absolute; left: 0; top: 18px; font: 500 12px/1 var(--font-mono); color: var(--amber); }

/* ---------- 6. design inputs (tabs) ---------- */
.pt__tabs { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: thin; scrollbar-color: var(--bg-raise-2) transparent; border-bottom: 1px solid var(--line-2); margin-bottom: clamp(24px, 3vw, 40px); }
.pt__tab { flex: 1 0 auto; display: grid; grid-template-columns: auto auto; grid-template-rows: auto auto; gap: 6px 10px; text-align: left; padding: 14px 16px 14px 0; border-bottom: 2px solid transparent; margin-bottom: -1px; color: var(--ink-3); transition: color 0.2s, border-color 0.2s; }
.pt__tab:hover { color: var(--ink); }
.pt__tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--amber); }
.pt__num { font: 500 11.5px/1 var(--font-mono); color: var(--amber); }
.pt__cnt { font: 400 11px/1 var(--font-mono); color: var(--ink-3); justify-self: end; }
.pt__lbl { grid-column: 1 / -1; font: 400 17px/1.15 var(--font-display); letter-spacing: -0.015em; white-space: nowrap; }
.js .pt__panel[hidden] { display: none; }
.pt__panel { outline: none; }
.no-js .pt__panel + .pt__panel { margin-top: 64px; }
.pt__panelhead { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 10px 24px; margin-bottom: 20px; }
.pt__doc { font: 400 12.5px var(--font-mono); color: var(--ink-2); text-decoration: none; }
.pt__doc:hover { color: var(--amber); }
.pt__rows { list-style: none; padding: 0; margin: 0; }
.pt__row { display: grid; grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.25fr) minmax(0, 1.05fr); gap: 12px clamp(20px, 2.6vw, 40px); padding: 22px 0; border-top: 1px solid var(--line); }
.pt__param { font: 400 clamp(19px, 1.6vw, 23px)/1.15 var(--font-display); letter-spacing: -0.02em; }
.pt__k { font: 500 10.5px/1.3 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.pt__vals p:not(.pt__k), .pt__dec p:not(.pt__k) { font: 400 15px/1.58 var(--font-text); color: var(--ink-2); }
.pt__src { margin-top: 12px; font: 400 12px/1.8 var(--font-mono) !important; color: var(--ink-3) !important; }
.pt__src .pt__k { display: inline; margin-right: 6px; }
.pt__src a { display: inline-block; padding: 2px 8px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-2); text-decoration: none; margin: 2px 0; }
.pt__src a:hover { border-color: var(--amber); color: var(--ink); }
.pt__dec { border-left: 2px solid var(--orange); padding-left: 16px; }
.pt__dec p:not(.pt__k) { color: var(--ink) !important; }
.pt__dec .pt__k { color: var(--orange-ink); }
/* screening chart */
.sc { margin-bottom: 28px; }
.sc__bars { list-style: none; padding: 14px 18px 8px; margin: 0; display: grid; gap: 8px; }
.sc__row { display: grid; grid-template-columns: 160px minmax(0, 1fr) 84px; gap: 14px; align-items: center; font: 400 12px/1.2 var(--font-mono); color: var(--ink-2); }
.sc__track { position: relative; height: 16px; background: rgba(255, 255, 255, 0.03); border-left: 1px solid var(--line-2); }
.sc__bar { position: absolute; left: 0; top: 0; bottom: 0; width: var(--v); background: var(--purple-ink); border-radius: 0 2px 2px 0; }
.sc__bar::after { content: ""; position: absolute; top: 50%; left: calc(100% - var(--e)); width: calc(var(--e) * 2); height: 1px; background: #fff; opacity: 0.8; }
.sc__row--max .sc__bar { background: var(--amber); }
.sc__row--max { color: var(--amber-ink); }
.sc__row--dim .sc__bar { background: #6a6a6a; }
.sc__row--neg .sc__bar { width: 2px; background: #6a6a6a; }
.sc__val { text-align: right; color: var(--ink); }

/* ---------- 7. materials (paper band) ---------- */
.dv-mat .kicker { color: var(--purple); }
.mt__head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: 24px clamp(28px, 4vw, 64px); align-items: end; margin-bottom: clamp(36px, 4.4vw, 64px); }
.mt__head .display-2 { color: var(--paper-ink); }
.mt__accent { color: var(--purple); }
.mt__lead { font: 400 15px/1.6 var(--font-mono); color: var(--paper-ink-2); }
.mt__cols { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(18px, 2.2vw, 32px); }
.mt__col { border-top: 3px solid var(--purple); padding-top: 16px; display: flex; flex-direction: column; }
.mt__colh { font: 400 clamp(22px, 1.9vw, 28px)/1.05 var(--font-display); letter-spacing: -0.03em; color: var(--purple); }
.mt__colh span { font: 500 11px/1 var(--font-mono); color: var(--paper-ink-2); vertical-align: 0.4em; letter-spacing: 0; }
.mt__items { list-style: none; padding: 0; margin: 14px 0 0; flex: 1; }
.mt__items li { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; padding: 10px 0; border-top: 1px solid var(--paper-line); }
.mt__name { font: 700 14.5px/1.3 var(--font-text); color: var(--paper-ink); }
.mt__vendor { grid-row: 2; font: 400 11.5px/1.3 var(--font-mono); color: var(--paper-ink-2); }
.mt__price { grid-row: 1 / span 2; grid-column: 2; align-self: center; font: 500 12.5px/1.2 var(--font-mono); color: var(--paper-ink); white-space: nowrap; text-align: right; }
.mt__more { margin-top: 12px; font: 500 12px var(--font-mono); color: var(--purple); text-decoration: none; }
.mt__more:hover { text-decoration: underline; }
.mt__lower { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); gap: clamp(28px, 4vw, 72px); margin-top: clamp(40px, 5vw, 72px); padding-top: clamp(28px, 3vw, 40px); border-top: 1px solid var(--paper-line); }
.mt__budget { margin: 0; }
.mt__budgetcap, .mt__k { font: 500 11.5px/1.4 var(--font-mono); color: var(--paper-ink-2); letter-spacing: 0.02em; }
.mt__budgetcap .mt__k { color: var(--purple); }
.mt__k { color: var(--purple); margin: 0 0 10px; }
.mt__axis { position: relative; height: 18px; margin: 18px 0 4px 188px; margin-right: 92px; font: 400 10.5px/1 var(--font-mono); color: var(--paper-ink-2); }
.mt__axis span { position: absolute; left: calc(var(--x) * 1%); transform: translateX(-50%); }
.mt__axis span:first-child { transform: none; }
.mt__ranges { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.mt__ranges li { display: grid; grid-template-columns: 172px minmax(0, 1fr) 76px; gap: 16px; align-items: center; }
.mt__rl { font: 400 14px/1.2 var(--font-text); color: var(--paper-ink); }
.mt__rt { position: relative; height: 22px; background: repeating-linear-gradient(90deg, transparent 0 calc(28.57% - 1px), var(--paper-line) calc(28.57% - 1px) 28.57%); border-left: 1px solid var(--paper-ink-2); }
.mt__rb { position: absolute; top: 3px; bottom: 3px; left: var(--a); width: calc(var(--b) - var(--a)); background: linear-gradient(90deg, var(--crimson), var(--purple)); border-radius: 2px; }
.mt__rv { font: 500 12.5px/1 var(--font-mono); color: var(--paper-ink); text-align: right; }
.mt__total { margin-top: 18px; font: 400 15px/1.5 var(--font-text); color: var(--paper-ink-2); }
.mt__total b { font: 400 clamp(34px, 3vw, 48px)/1 var(--font-display); letter-spacing: -0.04em; color: var(--purple); margin-right: 8px; vertical-align: -0.12em; }
.mt__order { list-style: none; padding: 0; margin: 0 0 24px; }
.mt__order li { padding: 9px 0; border-top: 1px solid var(--paper-line); font: 400 15px/1.4 var(--font-text); color: var(--paper-ink); }
.mt__order b { display: inline-block; width: 70px; font: 600 11px/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--purple); }
.mt__p { font: 400 15px/1.55 var(--font-text); color: var(--paper-ink); margin-bottom: 18px; }

/* ---------- 8. diagnostics ---------- */
.dv-diag__grid { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: clamp(28px, 5vw, 88px); align-items: start; }
.dv-diag__grid .dv-intro { position: sticky; top: calc(var(--header-h) + 32px); margin-bottom: 0; }
.dv-diag__cta { margin-top: 36px; }
.dg-list { list-style: none; padding: 0; margin: 0; border-bottom: 1px solid var(--line); }
.dg { border-top: 1px solid var(--line); }
.dg summary { display: grid; grid-template-columns: 40px 1fr 22px; gap: 14px; align-items: center; padding: 18px 0; cursor: pointer; list-style: none; }
.dg summary::-webkit-details-marker { display: none; }
.dg__n { font: 500 12px/1 var(--font-mono); color: var(--amber); }
.dg__name { font: 400 clamp(20px, 1.8vw, 26px)/1.15 var(--font-display); letter-spacing: -0.025em; transition: color 0.2s; }
.dg summary:hover .dg__name { color: var(--amber-ink); }
.dg li:first-child .dg__name { color: var(--amber-ink); }
.dg__plus { width: 22px; height: 22px; border: 1px solid var(--line-2); border-radius: 50%; position: relative; }
.dg__plus::before, .dg__plus::after { content: ""; position: absolute; left: 5px; right: 5px; top: 10px; height: 1px; background: var(--ink-2); }
.dg__plus::after { transform: rotate(90deg); transition: transform 0.25s; }
.dg[open] .dg__plus::after { transform: rotate(0); }
.dg__body { margin: 0 0 22px 54px; display: grid; gap: 14px; }
.dg__body dt { font: 500 10.5px/1.3 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--ink-3); }
.dg__body dd { margin: 4px 0 0; font: 400 15px/1.58 var(--font-text); color: var(--ink-2); }
.dg__body a { color: var(--ink); }

/* ---------- 9. deeper ---------- */
.dv-deeper__grid { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: clamp(28px, 5vw, 88px); }
.dv-deeper__note { font: 400 14px/1.65 var(--font-mono); color: var(--ink-2); margin-top: 24px; max-width: 46ch; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .dv-spec { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cm { grid-template-columns: 1fr; }
  .cm__panel { position: static; }
  .kn-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mt__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 36px; }
  .xs__detail { grid-template-columns: 1fr; gap: 12px; }
  .xs__rulelist { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .dv-hero__grid { grid-template-columns: 1fr; }
  .dv-hero__media { max-height: none; justify-self: stretch; order: -1; aspect-ratio: 4 / 3.4; }
  .dv-hero__media img { object-position: 50% 62%; }
  .dv-callout--flange { top: 16%; }
  .dv-callout--horn { top: 38%; }
  .dv-callout--slurry { top: 78%; }
  /* mechanism: figure pinned on top, steps scroll beneath it */
  .mx { grid-template-columns: 1fr; gap: 0; }
  .mx__figwrap { top: var(--header-h); z-index: 3; margin-inline: calc(var(--gutter) * -1); padding: 6px var(--gutter) 10px; background: var(--bg-deep); box-shadow: 0 18px 24px -12px var(--bg-deep); }
  .mx__stage { width: min(100%, 41vh); }
  .mx__fig .fig__cap { display: none; }
  .mx__bar { padding: 8px 10px; }
  .mx__scale { display: none; }
  .mx__ticks { margin-inline: 0 auto; }
  .mx__tick { min-width: 40px; height: 32px; }
  .mx-step { min-height: 64vh; padding-block: 28px 8vh; max-width: none; justify-content: flex-start; }
  .js .mx[data-step] .mx-step { opacity: 1; }
  .mx-t--k { font-size: 21px; letter-spacing: 0.02em; }
  .mx-t--v { font-size: 54px; }
  .mx-t--d { font-size: 22px; }
  .mx-t--s, .mx-t--tag, .mx-t--ion, .mx-t--sea { font-size: 21px; letter-spacing: 0.02em; }
  .cf { grid-template-columns: 1fr; }
  .cf__vs { padding: 4px 0; }
  .cf__rule, .xs__rules, .mt__head, .mt__lower, .dv-diag__grid, .dv-deeper__grid { grid-template-columns: 1fr; }
  .cf__rule > .chips, .xs__rules > .chips { grid-column: 1; }
  .dv-diag__grid .dv-intro { position: static; }
  .xs__head, .xs__foot, .xs__lane > summary { grid-template-columns: 1fr; gap: 6px; }
  .xs__head .xs__labelcol, .xs__foot .xs__labelcol { display: none; }
  .xs__trace { height: 46px; }
  .pt__row { grid-template-columns: 1fr; gap: 10px; }
}
@media (max-width: 640px) {
  .dv-spec { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .dv-spec b { font-size: 40px; }
  .kn-grid { grid-template-columns: 1fr; }
  .mt__cols { grid-template-columns: 1fr; }
  .cm__mats { grid-template-columns: 1fr; }
  .cm__grid { grid-template-columns: 68px repeat(4, minmax(0, 1fr)); gap: 4px; }
  .cm__axis--x { padding-left: 72px; }
  .cm__corner span:first-child { display: none; }
  .cm__name { font-size: 17px; }
  .cm__colh .cm__name { font-size: 12.5px; letter-spacing: -0.01em; }
  .cm__tag { font-size: 8.5px; letter-spacing: 0.02em; }
  .cm__cell { padding: 5px; aspect-ratio: 1 / 1; }
  .cf__spec div { grid-template-columns: 1fr; gap: 2px; }
  .sc__row { grid-template-columns: 110px minmax(0, 1fr) 70px; gap: 8px; font-size: 11px; }
  .mt__axis { margin-left: 0; margin-right: 0; display: none; }
  .mt__ranges li { grid-template-columns: 1fr 74px; gap: 6px 12px; }
  .mt__rt { grid-column: 1 / -1; grid-row: 2; }
  .dg__body { margin-left: 0; }
  .xs__chart { padding-inline: 12px; }
  .xs__ph { font-size: 9.5px; }
  .dv-callout { font-size: 9.5px; padding: 5px 6px; }
}


/* =====================================================================
   Round 4: shorter page, closed reference panels, phone figure cap
   ===================================================================== */
.page-device .section { padding-block: clamp(56px, 6.4vw, 104px); }
.page-device .dv-how { padding-block: clamp(56px, 6.4vw, 104px) clamp(24px, 3vw, 48px); }
.dv-intro { margin-bottom: clamp(28px, 3.4vw, 52px); }
.dv-intro .lead { margin-top: clamp(16px, 1.8vw, 24px); }
.mx-step { min-height: 62vh; padding-block: 4vh; }
.mx__steps { padding-bottom: 6vh; }

/* matrix: specs live in a closed panel */
.cm__mats { padding-top: 16px; margin-top: 18px; }
.cm__more { margin-top: 16px; border-top: 1px solid var(--paper-line); }
.cm__more summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 12px; padding: 12px 0 4px; font: 600 11px/1.3 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--purple); }
.cm__more summary::-webkit-details-marker { display: none; }
.cm__more summary::after { content: "+"; font: 400 18px/1 var(--font-display); }
.cm__more[open] summary::after { content: "−"; }
.cm__factsgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
.cm__factsgrid .cm__facts[hidden] { display: none; }

/* carriers: drawing and spec side by side inside each card */
.cf__cell { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); grid-template-rows: auto 1fr; align-items: center; }
.cf__cell > .fig__bar { grid-column: 1 / -1; }
.cf__cell > .cf__svg { margin: 14px 0 14px 14px; max-width: 280px; }
.cf__spec { padding: 14px 18px 14px 6px; align-self: start; }
.cf__spec div { grid-template-columns: 1fr; gap: 2px; padding: 9px 0; }
.cf__spec dd { font-size: 14px; }
.cf__rule { margin-top: clamp(24px, 3vw, 40px); }

/* design inputs: six tiles open the full tables */
.pt-tiles { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.pt-tile { display: grid; gap: 10px; align-content: start; height: 100%; padding: 18px 18px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-raise); text-decoration: none; transition: border-color 0.2s, background 0.2s; }
.pt-tile:hover { border-color: var(--amber); background: color-mix(in srgb, var(--amber) 5%, var(--bg-raise)); }
.pt-tile__top { display: flex; justify-content: space-between; font: 500 11.5px/1 var(--font-mono); color: var(--amber); }
.pt-tile__c { color: var(--ink-3); }
.pt-tile__t { font: 400 clamp(21px, 1.8vw, 26px)/1.1 var(--font-display); letter-spacing: -0.025em; }
.pt-tile__ex { font: 400 13px/1.55 var(--font-mono); color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.pt-tile__ex b { display: block; color: var(--orange-ink); font-weight: 500; font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 4px; }
.pt-tile__go { font: 500 11.5px/1 var(--font-mono); color: var(--ink-3); }
.pt-tile:hover .pt-tile__go { color: var(--amber); }
.dv-more--inputs { margin-top: 20px; }
.dv-more--inputs > .pt { padding: 8px 0 32px; }

/* materials: suppliers behind a disclosure */
.mt__lower { margin-top: 0; padding-top: 0; border-top: 0; }
.mt__more { margin-top: clamp(28px, 3vw, 44px); border-top: 1px solid var(--paper-line); border-bottom: 1px solid var(--paper-line); }
.mt__more > summary { display: flex; align-items: baseline; gap: 14px; padding: 18px 0; cursor: pointer; list-style: none; font: 400 15px/1.4 var(--font-text); color: var(--paper-ink); }
.mt__more > summary::-webkit-details-marker { display: none; }
.mt__more > summary::after { content: "+"; margin-left: auto; font: 400 22px/1 var(--font-display); color: var(--purple); }
.mt__more[open] > summary::after { content: "−"; }
.mt__morek { font: 500 11.5px/1 var(--font-mono); color: var(--purple); white-space: nowrap; }
.mt__more .mt__cols { padding-bottom: 28px; }
.mt__head { margin-bottom: clamp(24px, 3vw, 40px); }

/* excitation: rules collapsed; chips row only */
.xs__rules { display: block; margin-top: 18px; }
.dv-more .xs__rulelist { padding-top: 4px; }

/* deeper: two columns */
.dv-deeper__grid { grid-template-columns: 1fr; gap: 20px; }
.dv-deeper .deeper-list { grid-template-columns: 1fr 1fr; column-gap: clamp(24px, 4vw, 56px); }
.dv-deeper .deeper-list .deeper:nth-last-child(2) { border-bottom: 1px solid var(--line); }
.dv-diag__grid .dv-intro { margin-bottom: 0; }

@media (max-width: 1100px) {
  .pt-tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cf__cell { grid-template-columns: 1fr; }
  .cf__cell > .cf__svg { margin: 14px auto 0; }
  .cf__spec { padding: 6px 18px 18px; }
}
@media (max-width: 900px) {
  /* phone: the pinned figure shows only the drawing (readouts are in the step text) and stays under ~42vh */
  .mx__stage { aspect-ratio: 600 / 430; width: min(100%, calc((42vh - 64px) * 1.395)); }
  .js .mx[data-step] .mx__stage .mx-scene { height: auto; aspect-ratio: 1; bottom: auto; }
  .js .mx[data-step="5"] .mx-scene--contact { transform: translateY(-28.4%); }
  .mx__figwrap { padding-bottom: 6px; }
  .mx-step { min-height: 54vh; }
  .dv-deeper .deeper-list { grid-template-columns: 1fr; }
  .dv-deeper .deeper-list .deeper:nth-last-child(2) { border-bottom: 0; }
}
@media (max-width: 640px) {
  .pt-tiles { grid-template-columns: 1fr; }
  .cm__factsgrid { grid-template-columns: 1fr; }
  .cf__cell > .cf__svg { max-width: 300px; }
}

/* round 4, second pass */
.page-device .section { padding-block: clamp(48px, 5.4vw, 88px); }
.page-device .dv-how { padding-block: clamp(48px, 5.4vw, 88px) clamp(16px, 2vw, 32px); }
.dv-intro { max-width: 1240px; }
.dv-intro .lead { max-width: 64ch; }
.mx-step { min-height: 52vh; }
.cf__rule { grid-template-columns: 1fr; gap: 14px; }
.cf__rule > .chips { grid-column: 1; }
.cf__rows { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 clamp(16px, 2vw, 32px); }
.cf__row { grid-template-columns: 1fr; gap: 10px; align-items: start; border-bottom: 1px solid var(--line); }
.cf__field { flex-direction: row; width: 120px; }
.cf__field i { flex: 1; }
.cf__rulep { max-width: 60ch; }
@media (max-width: 900px) {
  .cf__rows { grid-template-columns: 1fr; }
  .mx-step { min-height: 54vh; }
}
.mx-step { padding-block: 20px; }
.mx-step__facts li { padding: 7px 0; font-size: 12.5px; }
.mx-step__p { margin-top: 14px; }
.mx-step__facts { margin-top: 16px; }
.dv-spec { margin-top: 24px; }
.dv-hero__honest { margin-top: 16px; }