/* ==========================================================================
   NVIL Response — interactive UI systems (EXP-005)
   Fifteen benches on one page, each one an input-driven system. Everything
   under .rs is NVIL: near-black, thin lines, mono labels, the red mark. The
   scripts write a handful of custom properties, inline transforms and state
   classes; this sheet turns them into feedback. Nothing here animates on its
   own except the cue arrow and a progress bar.
   ========================================================================== */

/* ---------- the page: header becomes a Lab mode bar, like Motion and Shift ---------- */
body.response-page .header { position: relative; transform: none; }
body.response-page .header:not(.header--menu-open) { background: var(--bg); }
body.response-page .header--hidden { transform: none; pointer-events: auto; }
body.response-page .header--scrolled { backdrop-filter: none; -webkit-backdrop-filter: none; box-shadow: 0 1px 0 var(--line); }
body.response-page .nav { padding-block: .55rem; }
body.response-page .nav__menu, body.response-page .nav__toggle { display: none; }
body.response-page .nav__brand img { width: 84px; }
body.response-page .footer { position: relative; z-index: 1; }
body.response-page .scrollbar { display: none; }   /* the page has its own progress rail */
.rs-modebar { display: flex; align-items: center; gap: .9rem; font: 600 .66rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); }
.rs-modebar__label { color: var(--ink); }
.rs-modebar__exp { margin-left: .5rem; padding: .32rem .5rem; border: 1px solid var(--line); color: var(--accent-text); }
.rs-modebar__exit { color: var(--ink-soft); text-decoration: none; padding: .34rem .55rem; border: 1px solid transparent; transition: color .2s ease, border-color .2s ease; }
.rs-modebar__exit:hover { color: var(--accent-text); border-color: var(--line); }
@media (max-width: 640px) { .rs-modebar__exp { display: none; } }

/* ---------- tokens (on body: the status panel and the rail live outside main) ---------- */
:root { --rs-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; }
body.response-page {
  --rs-bg: #0D0D0D; --rs-panel: #121214; --rs-raised: #17181C; --rs-line: #2B2E33; --rs-line-soft: rgba(244,244,245,.1);
  --rs-ink: #F4F4F5; --rs-soft: #A6A9AF; --rs-dim: #80848C; --rs-red: #E90012; --rs-red-text: #FF2A3C;
  --rs-ease: cubic-bezier(.22, .8, .3, 1); --rs-ease-io: cubic-bezier(.65, 0, .35, 1); --rs-spring: cubic-bezier(.34, 1.56, .64, 1);
}
.rs {
  --grid-dot: rgba(244,244,245,.07);
  color-scheme: dark; position: relative; background: var(--rs-bg); color: var(--rs-ink); font-family: var(--font-body); -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
.rs *, .rs *::before, .rs *::after { box-sizing: border-box; }
.rs p, .rs h1, .rs h2, .rs h3 { margin: 0; }
.rs :focus-visible { outline: 2px solid var(--rs-red); outline-offset: 3px; }
.rs-mono { font: 500 .68rem/1.5 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--rs-soft); }
.rs-mono--dim { color: var(--rs-dim); }
.rs-kicker { display: flex; align-items: center; gap: .55rem; flex-wrap: wrap; }
.rs-tag { margin-left: .4rem; padding: .22rem .5rem; border: 1px solid var(--rs-line); color: var(--rs-dim); font-size: .6rem; }
.rs-tri { width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 8px solid var(--rs-red); display: inline-block; margin-right: .5rem; }
.rs-cta { display: inline-flex; align-items: center; gap: .6rem; }
.rs-textlink { color: var(--rs-soft); font: 600 .72rem/1 var(--rs-mono); letter-spacing: .14em; text-transform: uppercase; text-decoration: none; border-bottom: 1px solid var(--rs-line); padding-bottom: .3rem; }
.rs-textlink:hover { color: var(--rs-ink); border-color: var(--rs-red); }
.rs .btn--ghost { background: transparent; color: var(--rs-ink); border: 1px solid var(--rs-line); }
.rs .btn--ghost:hover { border-color: var(--rs-ink); }
.rs-note { margin-top: 1.6rem; max-width: 26rem; font-size: .82rem; line-height: 1.55; color: var(--rs-dim); }
.rs input[type="range"] { width: 100%; accent-color: var(--rs-red); cursor: pointer; margin: 0; }

/* ---------- intro: a crosshair follows a fine pointer; nothing else moves ---------- */
.rs-intro { position: relative; min-height: calc(100vh - 46px); display: flex; align-items: center; padding: clamp(3rem, 8vw, 6rem) clamp(1.25rem, 6vw, 6rem); overflow: hidden; }
.rs-intro__grid { position: absolute; inset: 0; background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px); background-size: 28px 28px; opacity: .7; pointer-events: none; }
.rs-intro__cross { position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .35s ease; }
.rs-intro.is-tracking .rs-intro__cross { opacity: 1; }
.rs-intro__cross i { position: absolute; background: rgba(233,0,18,.32); }
.rs-intro__cross i:first-child { top: 0; bottom: 0; left: var(--x, 50%); width: 1px; }
.rs-intro__cross i:last-child { left: 0; right: 0; top: var(--y, 50%); height: 1px; }
.rs-intro__in { position: relative; max-width: 62rem; }
.rs-intro__title { margin: 1.6rem 0 1.3rem; font: 800 clamp(2.6rem, 7.4vw, 6.4rem)/.98 var(--font-display); letter-spacing: -.035em; text-transform: uppercase; }
.rs-intro__sub { max-width: 36rem; color: var(--rs-soft); font-size: 1.05rem; line-height: 1.65; }
.rs-intro__cue { margin: 2.2rem 0 2.6rem; }
.rs-cue { display: inline-flex; align-items: center; gap: .7rem; color: var(--rs-ink); text-decoration: none; font: 600 .78rem/1 var(--rs-mono); letter-spacing: .2em; text-transform: uppercase; padding: .9rem 1.2rem; border: 1px solid var(--rs-line); transition: border-color .2s ease; }
.rs-cue:hover { border-color: var(--rs-red); }
.rs-cue__arrow { display: inline-block; color: var(--rs-red-text); animation: rs-cue 2.4s var(--rs-ease-io) infinite; }
@keyframes rs-cue { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(5px); } }
.rs-readout { display: grid; grid-template-columns: repeat(4, auto); gap: 1.6rem 2.6rem; margin: 0 0 1.6rem; padding: 1rem 0; border-top: 1px solid var(--rs-line); border-bottom: 1px solid var(--rs-line); width: max-content; max-width: 100%; }
.rs-readout div { display: grid; gap: .35rem; }
.rs-readout dt { font: 500 .6rem/1 var(--rs-mono); letter-spacing: .18em; text-transform: uppercase; color: var(--rs-dim); }
.rs-readout dd { margin: 0; font: 600 .74rem/1 var(--rs-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--rs-ink); }
.rs-intro__device b { color: var(--rs-red-text); }
.rs-readout__ok::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--rs-red); margin-right: .5rem; box-shadow: 0 0 0 3px rgba(233,0,18,.2); }
.rs-intro__exp { margin-top: .2rem; }
.rs-intro__coord { font-variant-numeric: tabular-nums; }

/* ---------- system shell: head, bench and spec ---------- */
.rs-sys { position: relative; border-top: 1px solid var(--rs-line); padding: clamp(3rem, 6vw, 5rem) clamp(1.25rem, 6vw, 6rem); }
.rs-sys__head { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: .6rem 2rem; align-items: baseline; margin-bottom: 2rem; }
.rs-sys__id { font: 500 .62rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--rs-dim); }
.rs-sys__id b { display: block; margin-bottom: .5rem; font-size: 1rem; color: var(--rs-red-text); }
.rs-sys__name { font: 800 clamp(1.6rem, 3.4vw, 2.6rem)/1.02 var(--font-display); letter-spacing: -.025em; text-transform: uppercase; }
.rs-sys__desc { grid-column: 2; max-width: 40rem; color: var(--rs-soft); font-size: 1rem; line-height: 1.6; }
.rs-sys__body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: clamp(1.5rem, 3vw, 3rem); align-items: start; }
.rs-bench { border: 1px solid var(--rs-line); background: var(--rs-panel); }
.rs-bench__bar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: .7rem 1rem; border-bottom: 1px solid var(--rs-line); }
.rs-prompt { color: var(--rs-soft); }
.rs-live { white-space: nowrap; color: var(--rs-dim); }
.rs-live__v { margin-left: .6rem; color: var(--rs-red-text); }
.rs-bench__area { display: grid; place-items: center; min-height: 22rem; padding: clamp(1.25rem, 3vw, 2.5rem); background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px); background-size: 28px 28px; }
.rs-bench__area > * { width: 100%; max-width: 40rem; }
.rs-spec { position: relative; width: 300px; max-width: 100%; padding: 1rem 1.1rem 1.1rem; background: rgba(13,13,13,.92); border: 1px solid var(--rs-line); }
.rs-spec__rows { margin: 0; display: grid; gap: .1rem; }
.rs-spec__rows div { display: grid; grid-template-columns: 5.6rem 1fr; gap: .5rem; align-items: baseline; padding: .42rem 0; border-top: 1px solid var(--rs-line-soft); }
.rs-spec__rows div:first-child { border-top: 0; padding-top: 0; }
.rs-spec__rows dt { font: 500 .58rem/1.4 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--rs-dim); }
.rs-spec__rows dd { margin: 0; font: 600 .64rem/1.45 var(--rs-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--rs-ink); display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.rs-dots { display: inline-flex; gap: .25rem; }
.rs-dots i { width: 7px; height: 7px; border-radius: 50%; border: 1px solid var(--rs-soft); }
.rs-dots i.is-on { background: var(--rs-red); border-color: var(--rs-red); }

/* ---------- R-001 magnetic CTA ---------- */
.rs-mag { text-align: center; }
.rs-mag__btn { will-change: transform; }
.rs-mag__label { display: inline-flex; align-items: center; gap: .6rem; }
.rs-mag__btn.is-down { box-shadow: inset 0 0 0 100px rgba(0,0,0,.22); }
.rs-mag .rs-note { margin-inline: auto; }

/* ---------- R-002 spotlight surface ---------- */
.rs-spot__card { --mx: 50%; --my: 50%; position: relative; overflow: hidden; padding: clamp(1.4rem, 3vw, 2.2rem); border: 1px solid var(--rs-line); background: var(--rs-raised); transition: border-color .35s ease; touch-action: pan-y; }
.rs-spot__card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(260px circle at var(--mx) var(--my), rgba(233,0,18,.24), rgba(233,0,18,.06) 45%, transparent 70%); opacity: 0; transition: opacity .35s ease; pointer-events: none; }
.rs-spot__card::after { content: ""; position: absolute; inset: 0; border: 1px solid transparent; background: radial-gradient(180px circle at var(--mx) var(--my), rgba(244,244,245,.45), transparent 70%) border-box; -webkit-mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask: linear-gradient(#000 0 0) padding-box, linear-gradient(#000 0 0); mask-composite: exclude; opacity: 0; transition: opacity .35s ease; pointer-events: none; }
.rs-spot__card.is-lit::before, .rs-spot__card.is-lit::after { opacity: 1; }
.rs-spot__card.is-lit { border-color: rgba(244,244,245,.28); }
.rs-spot__card > * { position: relative; }
.rs-spot__title { margin: .8rem 0 .6rem; font: 800 clamp(1.4rem, 2.6vw, 1.9rem)/1.1 var(--font-display); letter-spacing: -.02em; }
.rs-spot__copy { max-width: 30rem; color: var(--rs-soft); line-height: 1.6; }
.rs-spot__meta { list-style: none; margin: 1.4rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.rs-spot__meta li { padding: .35rem .6rem; border: 1px solid var(--rs-line); font: 500 .6rem/1 var(--rs-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--rs-soft); }

/* ---------- R-003 depth press ---------- */
.rs-press { display: grid; place-items: center; }
.rs-press__btn { width: auto; max-width: 100%; padding: 0 0 7px; background: none; border: 0; color: var(--rs-ink); cursor: pointer; touch-action: manipulation; -webkit-tap-highlight-color: transparent; user-select: none; -webkit-user-select: none; }
.rs-press__face { display: grid; gap: .5rem; min-width: 15rem; padding: 1.3rem 1.8rem; text-align: left; background: var(--rs-raised); border: 1px solid var(--rs-line); box-shadow: 0 7px 0 #000, 0 7px 0 1px var(--rs-line); transform: translateY(0); transition: transform .12s var(--rs-ease), box-shadow .12s var(--rs-ease), border-color .2s ease; }
.rs-press__label { font: 800 1.1rem/1.1 var(--font-display); text-transform: uppercase; letter-spacing: -.01em; }
.rs-press__count { color: var(--rs-dim); }
.rs-press__btn:hover .rs-press__face { border-color: var(--rs-soft); }
.rs-press__btn.is-down .rs-press__face { transform: translateY(6px); box-shadow: 0 1px 0 #000, 0 1px 0 1px var(--rs-line); border-color: var(--rs-red); }
.rs-press__btn.is-down .rs-press__count { color: var(--rs-red-text); }

/* ---------- R-004 reveal lens ---------- */
@property --r { syntax: "<length>"; inherits: false; initial-value: 0px; }
.rs-lens__area { --x: 50%; --y: 50%; --r: 0px; position: relative; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--rs-line); background: var(--rs-raised); touch-action: none; cursor: crosshair; user-select: none; -webkit-user-select: none; transition: --r .35s var(--rs-ease); }
.rs-lens__area.is-on { --r: 120px; }
.rs-lens__surface, .rs-lens__structure { position: absolute; inset: 0; padding: clamp(1rem, 3vw, 2rem); display: grid; align-content: start; gap: .8rem; }
.rs-lens__surface { background: linear-gradient(160deg, #1B1C21, #121214 60%); }
.rs-lens__structure { background: #0D0D0D; background-image: linear-gradient(var(--rs-line-soft) 1px, transparent 1px), linear-gradient(90deg, var(--rs-line-soft) 1px, transparent 1px); background-size: 24px 24px; clip-path: circle(var(--r) at var(--x) var(--y)); }
.rs-lens__big { font: 800 clamp(1.4rem, 3.4vw, 2.6rem)/1.02 var(--font-display); letter-spacing: -.03em; text-transform: uppercase; max-width: 12ch; }
.rs-lens__big--wire { color: transparent; -webkit-text-stroke: 1px var(--rs-soft); }
.rs-lens__blocks { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: .5rem; margin-top: .4rem; }
.rs-lens__blocks i { display: block; height: clamp(2.4rem, 8vw, 4rem); background: var(--rs-line); }
.rs-lens__blocks--wire i { background: none; border: 1px dashed var(--rs-soft); position: relative; }
.rs-lens__blocks--wire i::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top right, transparent calc(50% - .5px), var(--rs-line) 50%, transparent calc(50% + .5px)); }
.rs-lens__tag { position: absolute; padding: .25rem .45rem; background: var(--rs-red); color: #fff; font: 600 .56rem/1 var(--rs-mono); letter-spacing: .12em; }
.rs-lens__tag--a { left: clamp(1rem, 3vw, 2rem); top: 42%; }
.rs-lens__tag--b { right: clamp(1rem, 3vw, 2rem); bottom: 12%; }
.rs-lens__ring { position: absolute; left: var(--x); top: var(--y); width: 240px; height: 240px; margin: -120px 0 0 -120px; border-radius: 50%; border: 1px solid rgba(233,0,18,.7); box-shadow: 0 0 0 1px rgba(13,13,13,.6); opacity: 0; transition: opacity .3s ease; pointer-events: none; }
.rs-lens__area.is-on .rs-lens__ring { opacity: 1; }
.rs-lens__ctl { display: grid; gap: .5rem; margin-top: 1rem; }

/* ---------- R-005 perspective tilt ---------- */
.rs-tilt { display: grid; place-items: center; }
.rs-tilt__card { --sx: 50%; position: relative; width: min(100%, 24rem); padding: 1.4rem; border: 1px solid var(--rs-line); background: var(--rs-raised); transform-style: preserve-3d; transition: border-color .3s ease; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.rs-tilt__card.is-live { border-color: var(--rs-soft); will-change: transform; }
.rs-tilt__sheen { position: absolute; inset: 0; background: linear-gradient(105deg, transparent calc(var(--sx) - 30%), rgba(244,244,245,.09) var(--sx), transparent calc(var(--sx) + 30%)); opacity: 0; transition: opacity .3s ease; pointer-events: none; }
.rs-tilt__card.is-live .rs-tilt__sheen { opacity: 1; }
.rs-tilt__art { margin: 1rem 0 1.1rem; aspect-ratio: 16 / 10; background: linear-gradient(135deg, #1F2026, #121214); border: 1px solid var(--rs-line); position: relative; overflow: hidden; }
.rs-tilt__art::before { content: ""; position: absolute; left: 12%; top: 18%; width: 46%; height: 30%; background: var(--rs-red); }
.rs-tilt__art::after { content: ""; position: absolute; right: 12%; bottom: 16%; width: 40%; height: 34%; border: 1px solid var(--rs-soft); }
.rs-tilt__title { font: 800 1.3rem/1.1 var(--font-display); letter-spacing: -.02em; text-transform: uppercase; }
.rs-tilt__copy { margin-top: .35rem; color: var(--rs-soft); font-size: .92rem; }

/* ---------- R-006 drag + snap ---------- */
.rs-drag__board { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; height: 270px; padding: 0; }
.rs-drag__target { position: relative; display: grid; place-items: center; border: 1px dashed var(--rs-dim); transition: border-color .2s ease, background .2s ease; }
.rs-drag__target span { font: 600 .66rem/1 var(--rs-mono); letter-spacing: .16em; color: var(--rs-dim); }
.rs-drag__target.is-home { border-style: solid; border-color: var(--rs-soft); }
.rs-drag__target.is-near { border-style: solid; border-color: var(--rs-red); background: rgba(233,0,18,.08); }
.rs-drag__target.is-near span { color: var(--rs-red-text); }
.rs-drag__mod { position: absolute; left: 0; top: 0; z-index: 2; display: grid; gap: .3rem; width: 108px; height: 76px; padding: .7rem .8rem; align-content: center; text-align: left; background: var(--rs-raised); border: 1px solid var(--rs-ink); color: var(--rs-ink); cursor: grab; touch-action: none; user-select: none; -webkit-user-select: none; will-change: transform; transition: box-shadow .2s ease, border-color .2s ease; }
.rs-drag__mod b { font: 800 1.4rem/1 var(--font-display); }
.rs-drag__mod .rs-mono { font-size: .56rem; color: var(--rs-dim); }
.rs-drag__mod.is-dragging { cursor: grabbing; border-color: var(--rs-red); box-shadow: 0 14px 30px rgba(0,0,0,.5); }
.rs-drag__read { margin-top: 1rem; }
.rs-drag__read b { margin-left: .5rem; color: var(--rs-red-text); }

/* ---------- R-007 elastic switch ---------- */
.rs-switch { display: flex; align-items: center; justify-content: center; gap: 1.1rem; }
.rs-switch__ctl { padding: 0; background: none; border: 0; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.rs-switch__track { position: relative; display: block; width: 60px; height: 32px; border-radius: 999px; background: var(--rs-line); border: 1px solid var(--rs-line); transition: background .3s ease, border-color .3s ease; }
.rs-switch__ctl[aria-checked="true"] .rs-switch__track { background: var(--rs-red); border-color: var(--rs-red); }
.rs-switch__thumb { position: absolute; top: 3px; left: 3px; width: 24px; height: 24px; border-radius: 999px; background: var(--rs-ink); transform: translateX(0); transform-origin: center; transition: transform .32s var(--rs-spring); }
.rs-switch__ctl[aria-checked="true"] .rs-switch__thumb { transform: translateX(28px); }
.rs-switch__ctl.is-going-on .rs-switch__thumb { animation: rs-on .34s var(--rs-ease) forwards; transition: none; }
.rs-switch__ctl.is-going-off .rs-switch__thumb { animation: rs-off .34s var(--rs-ease) forwards; transition: none; }
@keyframes rs-on { 0% { transform: translateX(0) scaleX(1); } 45% { transform: translateX(10px) scaleX(1.55); } 100% { transform: translateX(28px) scaleX(1); } }
@keyframes rs-off { 0% { transform: translateX(28px) scaleX(1); } 45% { transform: translateX(18px) scaleX(1.55); } 100% { transform: translateX(0) scaleX(1); } }
.rs-switch__label { font-size: 1rem; color: var(--rs-ink); }
.rs-switch__state { margin-left: .6rem; font: 600 .66rem/1 var(--rs-mono); letter-spacing: .16em; color: var(--rs-red-text); }

/* ---------- R-008 action morph ---------- */
.rs-morph { display: grid; justify-items: center; gap: 1.2rem; }
.rs-morph__btn { position: relative; display: grid; place-items: center; height: 54px; min-width: 16rem; padding: 0 1.6rem; background: var(--rs-red); color: #fff; border: 1px solid var(--rs-red); border-radius: 0; cursor: pointer; overflow: hidden; font: 600 .95rem/1 var(--font-body); transition: background .35s var(--rs-ease), color .35s var(--rs-ease), border-color .35s var(--rs-ease), border-radius .45s var(--rs-ease), min-width .45s var(--rs-ease); }
.rs-morph__lab { grid-area: 1 / 1; display: inline-flex; align-items: center; gap: .6rem; opacity: 0; transform: translateY(8px); transition: opacity .3s ease, transform .3s var(--rs-ease); white-space: nowrap; }
.rs-morph__btn[data-state="idle"] .rs-morph__lab[data-for="idle"], .rs-morph__btn[data-state="processing"] .rs-morph__lab[data-for="processing"], .rs-morph__btn[data-state="done"] .rs-morph__lab[data-for="done"], .rs-morph__btn[data-state="reset"] .rs-morph__lab[data-for="reset"] { opacity: 1; transform: none; }
.rs-morph__btn[data-state="processing"] { background: var(--rs-raised); color: var(--rs-soft); border-color: var(--rs-line); border-radius: 999px; min-width: 12rem; cursor: progress; }
.rs-morph__btn[data-state="processing"] .rs-morph__lab[data-for="processing"]::after { content: ""; width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--rs-line); border-top-color: var(--rs-red); animation: rs-spin .8s linear infinite; }
.rs-morph__bar { position: absolute; left: 0; bottom: 0; height: 2px; width: 100%; background: var(--rs-red); transform: scaleX(0); transform-origin: left; }
.rs-morph__btn[data-state="processing"] .rs-morph__bar { animation: rs-load 1.7s linear forwards; }
.rs-morph__btn[data-state="done"] { background: var(--rs-ink); color: var(--rs-bg); border-color: var(--rs-ink); border-radius: 999px; }
.rs-morph__btn[data-state="reset"] { background: transparent; color: var(--rs-ink); border-color: var(--rs-line); }
.rs-morph__btn[data-state="reset"]:hover, .rs-morph__btn[data-state="idle"]:hover { border-color: var(--rs-ink); }
@keyframes rs-load { to { transform: scaleX(1); } }
@keyframes rs-spin { to { transform: rotate(360deg); } }

/* ---------- R-009 smart input ---------- */
.rs-input { max-width: 26rem; margin-inline: auto; }
.rs-field { position: relative; }
.rs-field input { width: 100%; padding: 1.5rem 2.4rem .6rem 0; background: transparent; border: 0; border-bottom: 1px solid var(--rs-line); color: var(--rs-ink); font: 500 1.1rem/1.3 var(--font-body); outline: none; border-radius: 0; }
.rs-field label { position: absolute; left: 0; top: 1.35rem; color: var(--rs-soft); font-size: 1.05rem; transform-origin: left top; transition: transform .25s var(--rs-ease), color .25s ease, font-size .25s var(--rs-ease), letter-spacing .25s var(--rs-ease); pointer-events: none; }
.rs-field input:focus + label, .rs-field input:not(:placeholder-shown) + label { transform: translateY(-1.25rem); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: var(--rs-dim); }
.rs-field__line { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--rs-red); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--rs-ease), background .3s ease; }
.rs-field[data-state="focus"] .rs-field__line, .rs-field[data-state="typing"] .rs-field__line { transform: scaleX(1); }
.rs-field[data-state="validating"] .rs-field__line { transform: scaleX(1); background: var(--rs-soft); animation: rs-scan 1s var(--rs-ease-io) infinite; }
.rs-field[data-state="error"] .rs-field__line { transform: scaleX(1); background: var(--rs-red); }
.rs-field[data-state="valid"] .rs-field__line { transform: scaleX(1); background: var(--rs-ink); }
.rs-field[data-state="error"] label { color: var(--rs-red-text); }
.rs-field[data-state="error"] input { animation: rs-shake .3s var(--rs-ease); }
.rs-field__icon { position: absolute; right: 0; bottom: .7rem; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font: 700 .7rem/1 var(--rs-mono); opacity: 0; transform: scale(.6); transition: opacity .25s ease, transform .25s var(--rs-spring); }
.rs-field[data-state="valid"] .rs-field__icon { opacity: 1; transform: none; background: var(--rs-ink); color: var(--rs-bg); }
.rs-field[data-state="valid"] .rs-field__icon::before { content: "✓"; }
.rs-field[data-state="error"] .rs-field__icon { opacity: 1; transform: none; background: var(--rs-red); color: #fff; }
.rs-field[data-state="error"] .rs-field__icon::before { content: "!"; }
.rs-field[data-state="validating"] .rs-field__icon { opacity: 1; transform: none; border: 2px solid var(--rs-line); border-top-color: var(--rs-soft); animation: rs-spin .8s linear infinite; }
.rs-field__msg { margin-top: .8rem; min-height: 1.4em; font-size: .85rem; line-height: 1.5; color: var(--rs-soft); transition: color .2s ease; }
.rs-field[data-state="error"] + .rs-field__msg { color: var(--rs-red-text); }
.rs-field[data-state="valid"] + .rs-field__msg { color: var(--rs-ink); }
@keyframes rs-scan { 0% { transform-origin: left; transform: scaleX(0); } 50% { transform-origin: left; transform: scaleX(1); } 51% { transform-origin: right; } 100% { transform-origin: right; transform: scaleX(0); } }
@keyframes rs-shake { 0%, 100% { transform: translateX(0); } 30% { transform: translateX(-3px); } 60% { transform: translateX(3px); } }

/* ---------- R-010 expanding content ---------- */
.rs-acc { border-top: 1px solid var(--rs-line); }
.rs-acc__item { border-bottom: 1px solid var(--rs-line); }
.rs-acc__h { font: inherit; }
.rs-acc__h button { display: flex; justify-content: space-between; align-items: center; gap: 1rem; width: 100%; padding: 1rem 0; background: none; border: 0; color: var(--rs-ink); font: 600 1.02rem/1.3 var(--font-body); text-align: left; cursor: pointer; transition: color .2s ease; }
.rs-acc__h button:hover { color: var(--rs-red-text); }
.rs-acc__ind { position: relative; flex: none; width: 14px; height: 14px; }
.rs-acc__ind::before, .rs-acc__ind::after { content: ""; position: absolute; left: 0; top: 6px; width: 14px; height: 2px; background: currentColor; transition: transform .35s var(--rs-ease); }
.rs-acc__ind::after { transform: rotate(90deg); }
.rs-acc__item.is-open .rs-acc__ind::after { transform: rotate(0deg); }
.rs-acc__item.is-open .rs-acc__ind::before { transform: rotate(180deg); }
.rs-acc__panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .4s var(--rs-ease); }
.rs-acc__panel[hidden] { display: none; }
.rs-acc__item.is-open .rs-acc__panel { grid-template-rows: 1fr; }
.rs-acc__inner { min-height: 0; overflow: hidden; }
.rs-acc__inner p { padding: 0 2rem 1.1rem 0; color: var(--rs-soft); font-size: .95rem; line-height: 1.6; opacity: 0; transform: translateY(-4px); transition: opacity .3s ease, transform .3s var(--rs-ease); }
.rs-acc__item.is-open .rs-acc__inner p { opacity: 1; transform: none; transition-delay: .1s; }

/* ---------- R-011 nav morph ---------- */
.rs-nav__site { position: relative; height: 340px; overflow: hidden; border: 1px solid var(--rs-line); background: var(--rs-raised); }
.rs-nav__bar { position: relative; z-index: 3; display: flex; justify-content: space-between; align-items: center; padding: .9rem 1.1rem; }
.rs-nav__brand { font: 800 .95rem/1 var(--font-display); letter-spacing: .12em; }
.rs-nav__ctl { display: inline-flex; align-items: center; gap: .7rem; padding: .55rem .85rem; background: var(--rs-raised); border: 1px solid var(--rs-line); color: var(--rs-ink); cursor: pointer; font: 600 .66rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; transition: border-color .25s ease, background .25s ease; }
.rs-nav__ctl:hover { border-color: var(--rs-ink); }
.rs-nav__site.is-open .rs-nav__ctl { background: var(--rs-ink); color: var(--rs-bg); border-color: var(--rs-ink); }
.rs-nav__word { display: grid; }
.rs-nav__word span { grid-area: 1 / 1; transition: opacity .25s ease, transform .25s var(--rs-ease); }
.rs-nav__word span:last-child { opacity: 0; transform: translateY(6px); }
.rs-nav__site.is-open .rs-nav__word span:first-child { opacity: 0; transform: translateY(-6px); }
.rs-nav__site.is-open .rs-nav__word span:last-child { opacity: 1; transform: none; }
.rs-nav__ctl i { position: relative; width: 16px; height: 10px; }
.rs-nav__ctl i::before, .rs-nav__ctl i::after { content: ""; position: absolute; left: 0; width: 16px; height: 2px; background: currentColor; transition: transform .35s var(--rs-ease), top .35s var(--rs-ease); }
.rs-nav__ctl i::before { top: 0; } .rs-nav__ctl i::after { top: 8px; }
.rs-nav__site.is-open .rs-nav__ctl i::before { top: 4px; transform: rotate(45deg); }
.rs-nav__site.is-open .rs-nav__ctl i::after { top: 4px; transform: rotate(-45deg); }
.rs-nav__page { padding: 1.4rem 1.1rem; display: grid; gap: .8rem; transition: opacity .35s ease, transform .45s var(--rs-ease); }
.rs-nav__h { font: 800 clamp(1.5rem, 3vw, 2.2rem)/1.02 var(--font-display); letter-spacing: -.03em; text-transform: uppercase; max-width: 12ch; }
.rs-nav__page i { display: block; height: 10px; background: var(--rs-line); width: 70%; }
.rs-nav__page i:nth-of-type(2) { width: 55%; } .rs-nav__page i:nth-of-type(3) { width: 40%; }
.rs-nav__site.is-open .rs-nav__page { opacity: .18; transform: scale(.98); }
.rs-nav__panel { position: absolute; z-index: 2; left: 0; right: 0; top: 0; bottom: 0; display: grid; align-content: center; gap: .25rem; padding: 3.6rem 1.1rem 1.4rem; background: var(--rs-bg); clip-path: inset(.9rem 1.1rem calc(100% - 3.4rem) calc(100% - 7.6rem)); opacity: 0; transition: clip-path .5s var(--rs-ease), opacity .3s ease; }
.rs-nav__panel[hidden] { display: none; }
.rs-nav__site.is-open .rs-nav__panel { clip-path: inset(0); opacity: 1; }
.rs-nav__panel a { color: var(--rs-ink); text-decoration: none; font: 800 clamp(1.4rem, 3vw, 2rem)/1.15 var(--font-display); letter-spacing: -.02em; text-transform: uppercase; opacity: 0; transform: translateY(10px); transition: opacity .3s ease, transform .35s var(--rs-ease), color .2s ease; }
.rs-nav__panel a:hover { color: var(--rs-red-text); }
.rs-nav__site.is-open .rs-nav__panel a { opacity: 1; transform: none; }
.rs-nav__site.is-open .rs-nav__panel a:nth-child(1) { transition-delay: .12s; } .rs-nav__site.is-open .rs-nav__panel a:nth-child(2) { transition-delay: .17s; } .rs-nav__site.is-open .rs-nav__panel a:nth-child(3) { transition-delay: .22s; } .rs-nav__site.is-open .rs-nav__panel a:nth-child(4) { transition-delay: .27s; }
.rs-nav__panel .rs-mono { margin-top: 1rem; }

/* ---------- R-012 intent response ---------- */
.rs-intent { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.rs-intent__mod { position: relative; display: grid; gap: .5rem; padding: 1.1rem; border: 1px solid var(--rs-line); background: var(--rs-raised); cursor: default; transition: border-color .2s ease, background .2s ease, box-shadow .2s ease; }
.rs-intent__mod.is-considering { box-shadow: inset 0 0 0 1px var(--rs-dim); }
.rs-intent__mod.is-on { border-color: var(--rs-ink); background: #1B1C21; }
.rs-intent__sub { color: var(--rs-soft); font-size: .9rem; }
.rs-intent__prev { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: .4rem; height: 64px; align-items: end; margin: .6rem 0; }
.rs-intent__prev i { display: block; height: 100%; background: var(--rs-line); transform: scaleY(.28); transform-origin: bottom; opacity: .5; transition: transform .3s var(--rs-ease), opacity .3s ease, background .3s ease; }
.rs-intent__mod.is-on .rs-intent__prev i { transform: none; opacity: 1; }
.rs-intent__mod.is-on .rs-intent__prev i:first-child { background: var(--rs-red); }
.rs-intent__mod.is-on .rs-intent__prev i:nth-child(2) { transition-delay: .05s; } .rs-intent__mod.is-on .rs-intent__prev i:nth-child(3) { transition-delay: .1s; }
.rs-intent__count b { margin-left: .4rem; color: var(--rs-red-text); font-variant-numeric: tabular-nums; }

/* ---------- R-013 context cursor ---------- */
.rs-ctx { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.rs-ctx.is-custom, .rs-ctx.is-custom * { cursor: none; }
.rs-ctx__zone { position: relative; display: grid; gap: .6rem; padding: .9rem; text-align: left; background: var(--rs-raised); border: 1px solid var(--rs-line); color: var(--rs-ink); cursor: pointer; transition: border-color .2s ease; -webkit-tap-highlight-color: transparent; }
.rs-ctx__zone:hover, .rs-ctx__zone.is-tapped { border-color: var(--rs-soft); }
.rs-ctx__art { display: block; aspect-ratio: 16 / 9; border: 1px solid var(--rs-line); position: relative; overflow: hidden; }
.rs-ctx__art--img { background: linear-gradient(135deg, #2A2C33, #121214 70%); }
.rs-ctx__art--img::after { content: ""; position: absolute; left: 14%; bottom: 16%; width: 36%; height: 42%; background: var(--rs-red); }
.rs-ctx__art--drag { background-image: radial-gradient(rgba(244,244,245,.18) 1px, transparent 1px); background-size: 12px 12px; }
.rs-ctx__art--drag::after { content: ""; position: absolute; left: 30%; top: 30%; width: 26%; height: 40%; border: 1px solid var(--rs-ink); background: var(--rs-panel); }
.rs-ctx__art--video { background: #0A0A0B; }
.rs-ctx__art--video::after { content: ""; position: absolute; left: 50%; top: 50%; width: 0; height: 0; margin: -9px 0 0 -6px; border-left: 16px solid var(--rs-soft); border-top: 9px solid transparent; border-bottom: 9px solid transparent; }
.rs-ctx__art--case { background: repeating-linear-gradient(0deg, transparent 0 10px, var(--rs-line) 10px 11px); }
.rs-ctx__art--case::after { content: ""; position: absolute; left: 12%; top: 22%; width: 50%; height: 6px; background: var(--rs-ink); }
.rs-ctx__chip { position: absolute; right: .9rem; top: .8rem; padding: .28rem .5rem; border: 1px solid var(--rs-red); color: var(--rs-red-text); font: 600 .56rem/1 var(--rs-mono); letter-spacing: .14em; opacity: 0; transition: opacity .2s ease; }
.rs-ctx__zone.is-tapped .rs-ctx__chip, .rs-ctx__zone:focus-visible .rs-ctx__chip, html[data-input="touch"] .rs-ctx__chip { opacity: 1; }
.rs-ctx__zone.is-tapped .rs-ctx__chip { background: var(--rs-red); color: #fff; }
.rs-ctx__cursor { position: absolute; left: 0; top: 0; z-index: 5; width: 12px; height: 12px; margin: -6px 0 0 -6px; border-radius: 50%; background: var(--rs-ink); display: grid; place-items: center; opacity: 0; pointer-events: none; will-change: transform; transition: width .25s var(--rs-ease), height .25s var(--rs-ease), margin .25s var(--rs-ease), background .25s ease, opacity .15s ease; }
.rs-ctx.is-custom .rs-ctx__cursor { opacity: 1; }
.rs-ctx__cursor.has-ctx { width: 60px; height: 60px; margin: -30px 0 0 -30px; background: var(--rs-red); mix-blend-mode: normal; }
.rs-ctx__cursor span { color: #fff; font: 700 .58rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; opacity: 0; transition: opacity .2s ease .1s; }
.rs-ctx__cursor.has-ctx span { opacity: 1; }

/* ---------- R-014 spring follow ---------- */
.rs-spring { display: grid; grid-template-columns: minmax(0, 1fr) 13rem; gap: 1rem; align-items: start; }
.rs-spring__field { position: relative; height: 290px; border: 1px solid var(--rs-line); background: var(--rs-raised); background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px); background-size: 20px 20px; overflow: hidden; touch-action: none; cursor: crosshair; user-select: none; -webkit-user-select: none; }
.rs-spring__lead { position: absolute; left: 0; top: 0; width: 8px; height: 8px; margin: -4px 0 0 -4px; border-radius: 50%; background: var(--rs-red); }
.rs-spring__follow { position: absolute; left: 0; top: 0; width: 42px; height: 42px; margin: -21px 0 0 -21px; border: 2px solid var(--rs-ink); background: var(--rs-bg); will-change: transform; }
.rs-spring__ctl { display: grid; gap: .8rem; }
.rs-spring__presets { display: flex; gap: .35rem; }
.rs-spring__presets button { flex: 1; padding: .55rem .4rem; background: none; border: 1px solid var(--rs-line); color: var(--rs-soft); cursor: pointer; font: 600 .6rem/1 var(--rs-mono); letter-spacing: .14em; text-transform: uppercase; transition: background .2s ease, color .2s ease, border-color .2s ease; }
.rs-spring__presets button:hover { border-color: var(--rs-ink); color: var(--rs-ink); }
.rs-spring__presets button.is-on { background: var(--rs-ink); color: var(--rs-bg); border-color: var(--rs-ink); }
.rs-spring__slider { display: grid; gap: .35rem; }
.rs-spring__read { color: var(--rs-ink); font-variant-numeric: tabular-nums; }
.rs-spring__nudge { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; padding: .7rem .9rem; background: none; border: 1px solid var(--rs-line); color: var(--rs-ink); cursor: pointer; font: 600 .66rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; transition: border-color .2s ease; }
.rs-spring__nudge:hover { border-color: var(--rs-red); }
.rs-spring__nudge i { color: var(--rs-red-text); font-style: normal; }

/* ---------- R-015 state machine ---------- */
.rs-sm { display: grid; gap: 1.2rem; justify-items: center; }
.rs-sm__stage { display: flex; align-items: center; justify-content: center; gap: .8rem; flex-wrap: wrap; }
.rs-sm__btn { position: relative; height: 54px; min-width: 14rem; padding: 0 1.6rem; background: transparent; border: 1px solid var(--rs-ink); color: var(--rs-ink); cursor: pointer; overflow: hidden; font: 600 .95rem/1 var(--font-body); transition: background .2s ease, color .2s ease, border-color .2s ease, transform .12s var(--rs-ease); -webkit-tap-highlight-color: transparent; user-select: none; -webkit-user-select: none; }
.rs-sm__btn[data-state="hover"] { background: var(--rs-raised); border-color: var(--rs-soft); }
.rs-sm__btn[data-state="pressed"] { background: var(--rs-ink); color: var(--rs-bg); transform: scale(.97); }
.rs-sm__btn[data-state="processing"] { color: var(--rs-soft); border-color: var(--rs-line); cursor: progress; }
.rs-sm__btn[data-state="success"] { background: var(--rs-red); border-color: var(--rs-red); color: #fff; cursor: default; }
.rs-sm__bar { position: absolute; left: 0; bottom: 0; width: 100%; height: 2px; background: var(--rs-red); transform: scaleX(0); transform-origin: left; }
.rs-sm__btn[data-state="processing"] .rs-sm__bar { animation: rs-load 1.5s linear forwards; }
.rs-sm__reset { display: inline-flex; align-items: center; gap: .5rem; height: 54px; padding: 0 1rem; background: none; border: 1px solid var(--rs-line); color: var(--rs-ink); cursor: pointer; font: 600 .66rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; }
.rs-sm__reset:hover { border-color: var(--rs-ink); }
.rs-sm__reset i { color: var(--rs-red-text); font-style: normal; }
.rs-sm__diagram { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem 1.5rem; }
.rs-sm__diagram li { position: relative; padding: .45rem .65rem; border: 1px solid var(--rs-line); color: var(--rs-dim); font: 600 .6rem/1 var(--rs-mono); letter-spacing: .14em; text-transform: uppercase; transition: border-color .2s ease, color .2s ease, background .2s ease; }
.rs-sm__diagram li:not(:last-child)::after { content: "→"; position: absolute; right: -1.15rem; top: 50%; transform: translateY(-50%); color: var(--rs-dim); }
.rs-sm__diagram li.is-on { border-color: var(--rs-red); color: var(--rs-ink); background: rgba(233,0,18,.12); }
.rs-sm__log { text-align: center; }

/* ---------- status strip: the persistent readout, one line along the bottom ---------- */
body.response-page { --rs-strip: 34px; }
body.response-page .a11y-btn { bottom: calc(var(--rs-strip) + .9rem); }
body.response-page .footer::after { content: ""; display: block; height: var(--rs-strip); }
.rs-status { position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; display: flex; align-items: center; gap: 1.6rem; height: var(--rs-strip); padding: 0 clamp(1.25rem, 6vw, 6rem) 0 1.25rem; background: rgba(13,13,13,.94); border-top: 1px solid var(--rs-line); color: var(--rs-ink); font-family: var(--rs-mono); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.rs-status__head { display: flex; align-items: center; margin: 0; font: 600 .6rem/1 var(--rs-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--rs-ink); white-space: nowrap; }
.rs-status__head::after { content: ""; margin-left: .7rem; width: 7px; height: 7px; border-radius: 50%; background: var(--rs-dim); transition: background .2s ease, box-shadow .2s ease; }
.rs-status.is-active .rs-status__head::after { background: var(--rs-red); box-shadow: 0 0 0 3px rgba(233,0,18,.2); }
.rs-status__rows { margin: 0; display: flex; align-items: center; gap: 1.4rem; min-width: 0; }
.rs-status__row { display: flex; align-items: baseline; gap: .45rem; font: 500 .58rem/1 var(--rs-mono); letter-spacing: .12em; text-transform: uppercase; white-space: nowrap; }
.rs-status__row dt { color: var(--rs-dim); }
.rs-status__row dd { margin: 0; color: var(--rs-ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.rs-status__row[data-k="x"] dd, .rs-status__row[data-k="y"] dd { min-width: 2.6em; }
.rs-status__row[data-k="state"] dd { color: var(--rs-red-text); }

/* ---------- progress rail ---------- */
.rs-rail { position: fixed; right: clamp(.6rem, 2vw, 1.6rem); top: 50%; transform: translateY(-50%); z-index: 40; display: grid; gap: .3rem; }
.rs-rail__item { display: grid; grid-template-columns: auto 8px; align-items: center; gap: .5rem; padding: .12rem .2rem; background: none; border: 0; color: var(--rs-dim); cursor: pointer; font: 600 .56rem/1 var(--rs-mono); letter-spacing: .12em; text-decoration: none; }
.rs-rail__item i { width: 8px; height: 8px; border-radius: 50%; border: 1px solid var(--rs-dim); transition: background .25s ease, border-color .25s ease, transform .25s ease; }
.rs-rail__item.is-done i { background: var(--rs-soft); border-color: var(--rs-soft); }
.rs-rail__item.is-on { color: var(--rs-ink); }
.rs-rail__item.is-on i { background: var(--rs-red); border-color: var(--rs-red); transform: scale(1.3); box-shadow: 0 0 0 4px rgba(233,0,18,.18); }
.rs-rail__label { position: absolute; right: 0; bottom: calc(100% + .8rem); white-space: nowrap; padding: .4rem .6rem; background: rgba(13,13,13,.9); border: 1px solid var(--rs-line); font: 600 .6rem/1 var(--rs-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--rs-ink); opacity: 0; transition: opacity .3s ease; pointer-events: none; }
.rs-rail.is-active:hover .rs-rail__label, .rs-rail.is-active:focus-within .rs-rail__label { opacity: 1; }
.rs-rail__label b { color: var(--rs-red-text); margin-right: .5rem; }
.rs-rail__mobile { display: none; }

/* ---------- outro ---------- */
.rs-outro { position: relative; min-height: 90vh; display: flex; align-items: center; padding: clamp(4rem, 10vh, 8rem) clamp(1.25rem, 6vw, 6rem); border-top: 1px solid var(--rs-line); background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px); background-size: 28px 28px; }
.rs-outro__in { max-width: 60rem; }
.rs-outro__count { color: var(--rs-soft); }
.rs-outro__count b { color: var(--rs-red-text); margin-right: .8rem; font-size: 1rem; }
.rs-outro__title { margin: 1.4rem 0 1rem; font: 800 clamp(2.2rem, 6.2vw, 5.4rem)/.98 var(--font-display); letter-spacing: -.035em; text-transform: uppercase; }
.rs-outro__line { margin: 0 0 1.4rem; font: 700 clamp(1.3rem, 3.4vw, 2.6rem)/1.08 var(--font-display); letter-spacing: -.03em; text-transform: uppercase; color: var(--rs-red-text); }
.rs-outro__sub { max-width: 38rem; color: var(--rs-soft); font-size: 1.05rem; line-height: 1.65; margin-bottom: 2rem; }
.rs-outro__brand { margin-bottom: 2rem; color: var(--rs-soft); }
.rs-outro__brand b { color: var(--rs-ink); margin-right: .8rem; }
.rs-outro__actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem; }
.rs-outro__replay { margin-bottom: 1.6rem; }
.rs-outro__next { margin-bottom: 2.4rem; color: var(--rs-dim); }
.rs-outro__next .rs-textlink { margin-left: .4rem; color: var(--rs-ink); }
.rs-outro__in > * { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--rs-ease), transform .7s var(--rs-ease); }
.rs-outro.is-in .rs-outro__in > * { opacity: 1; transform: none; }
.rs-outro.is-in .rs-outro__in > :nth-child(2) { transition-delay: .1s; } .rs-outro.is-in .rs-outro__in > :nth-child(3) { transition-delay: .2s; } .rs-outro.is-in .rs-outro__in > :nth-child(4) { transition-delay: .3s; } .rs-outro.is-in .rs-outro__in > :nth-child(5) { transition-delay: .4s; } .rs-outro.is-in .rs-outro__in > :nth-child(6) { transition-delay: .5s; } .rs-outro.is-in .rs-outro__in > :nth-child(7) { transition-delay: .6s; } .rs-outro.is-in .rs-outro__in > :nth-child(8) { transition-delay: .7s; }

/* ---------- phones and small tablets ---------- */
@media (max-width: 900px) {
  .rs-intro { min-height: calc(100vh - 46px); padding: 3rem 1.25rem; }
  .rs-readout { grid-template-columns: 1fr 1fr; gap: 1rem 1.6rem; width: 100%; }
  .rs-sys { padding: 2.6rem 1.25rem 3rem; }
  .rs-sys__head { grid-template-columns: 1fr; gap: .5rem; margin-bottom: 1.4rem; }
  .rs-sys__desc { grid-column: 1; }
  .rs-sys__body { grid-template-columns: 1fr; gap: 1rem; }
  .rs-spec { width: 100%; }
  .rs-bench__bar { flex-direction: column; align-items: flex-start; gap: .35rem; padding: .7rem .9rem; }
  .rs-bench__area { min-height: 0; padding: 1.1rem .9rem; }
  .rs-drag__board { height: 230px; }
  .rs-drag__mod { width: 92px; height: 68px; }
  .rs-intent { grid-template-columns: 1fr; }
  .rs-spring { grid-template-columns: 1fr; }
  .rs-spring__field { height: 240px; }
  .rs-nav__site { height: 320px; }
  .rs-lens__area { aspect-ratio: 4 / 3; }
  .rs-lens__ring { width: 180px; height: 180px; margin: -90px 0 0 -90px; }
  .rs-lens__area.is-on { --r: 90px; }
  .rs-outro { padding: 4rem 1.25rem; }
  /* progress: a compact chip bottom-right, the readout folded to three values above it */
  .rs-rail { display: none; }
  .rs-rail__mobile { display: flex; align-items: center; gap: .6rem; position: fixed; right: .75rem; bottom: .9rem; z-index: 40; padding: .5rem .65rem; background: rgba(13,13,13,.92); border: 1px solid var(--rs-line); font: 600 .58rem/1 var(--rs-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--rs-ink); max-width: 60vw; }
  .rs-rail__mobile b { color: var(--rs-red-text); white-space: nowrap; }
  .rs-rail__mobile i { display: block; flex: none; width: 44px; height: 2px; background: var(--rs-line); position: relative; }
  .rs-rail__mobile i::after { content: ""; position: absolute; inset: 0; background: var(--rs-red); transform-origin: left; transform: scaleX(var(--pp, 0)); }
  .rs-rail__mobile span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .rs-rail__mobile { bottom: calc(var(--rs-strip) + .7rem); }
  .rs-status { padding: 0 .9rem; gap: .9rem; }
  .rs-status__head { font-size: .54rem; }
  .rs-status__head::after { display: none; }
  .rs-status__rows { gap: .8rem; }
  .rs-status__row[data-k="x"], .rs-status__row[data-k="y"], .rs-status__row[data-k="status"] { display: none; }
  .rs-status__row dd { max-width: 9rem; overflow: hidden; text-overflow: ellipsis; }
}
@media (max-width: 560px) {
  .rs-status__head { display: none; }
  .rs-ctx { grid-template-columns: 1fr 1fr; gap: .5rem; }
  .rs-ctx__zone { padding: .6rem; }
  .rs-sm__diagram { gap: .4rem 1.3rem; }
  .rs-sm__diagram li { font-size: .54rem; padding: .4rem .5rem; }
  .rs-sm__diagram li:not(:last-child)::after { right: -1rem; }
}

/* ---------- reduced motion: feedback stays, overshoot, tilt and big travel go ----------
   Both signals: the media query and the site's a11y-motion option (html.rs-reduce).
   The scripts already skip the magnetic pull, the tilt and the intro crosshair. */
html.rs-reduce .rs-cue__arrow { animation: none; }
html.rs-reduce .rs-intro__cross { display: none; }
html.rs-reduce .rs-press__face { transition: none; }
html.rs-reduce .rs-press__btn.is-down .rs-press__face { transform: translateY(2px); box-shadow: 0 5px 0 #000, 0 5px 0 1px var(--rs-line); }
html.rs-reduce .rs-lens__area { transition: none; }
html.rs-reduce .rs-lens__ring { transition: none; }
html.rs-reduce .rs-switch__thumb { transition: transform .15s linear; }
html.rs-reduce .rs-switch__ctl.is-going-on .rs-switch__thumb, html.rs-reduce .rs-switch__ctl.is-going-off .rs-switch__thumb { animation: none; transition: transform .15s linear; }
html.rs-reduce .rs-morph__btn { transition-duration: .15s; }
html.rs-reduce .rs-morph__lab { transition: opacity .15s ease; transform: none; }
html.rs-reduce .rs-field label { transition: none; }
html.rs-reduce .rs-field__line { transition: background .15s ease; }
html.rs-reduce .rs-field[data-state="validating"] .rs-field__line { animation: none; }
html.rs-reduce .rs-field[data-state="error"] input { animation: none; }
html.rs-reduce .rs-field__icon { transition: opacity .15s ease; transform: none; }
html.rs-reduce .rs-acc__panel { transition-duration: .02s; }
html.rs-reduce .rs-acc__inner p { transition: none; opacity: 1; transform: none; }
html.rs-reduce .rs-acc__ind::before, html.rs-reduce .rs-acc__ind::after { transition: none; }
html.rs-reduce .rs-nav__panel { transition: opacity .02s linear; clip-path: none; }
html.rs-reduce .rs-nav__panel a { transition: none; transition-delay: 0s !important; transform: none; }
html.rs-reduce .rs-nav__page { transition: none; transform: none; }
html.rs-reduce .rs-nav__word span, html.rs-reduce .rs-nav__ctl i::before, html.rs-reduce .rs-nav__ctl i::after { transition: none; }
html.rs-reduce .rs-intent__prev i { transition: none; transition-delay: 0s !important; }
html.rs-reduce .rs-ctx__cursor { transition: opacity .15s ease; }
html.rs-reduce .rs-sm__btn { transition: background .15s ease, color .15s ease, border-color .15s ease; }
html.rs-reduce .rs-sm__btn[data-state="pressed"] { transform: none; }
html.rs-reduce .rs-rail__item.is-on i { transform: none; }
html.rs-reduce .rs-outro__in > * { transition: none; opacity: 1; transform: none; }

/* ---------- touch: larger hit areas, chips stay visible ---------- */
html[data-input="touch"] .rs-switch__ctl { padding: .4rem; margin: -.4rem; }
html[data-input="touch"] .rs-sm__diagram li, html[data-input="touch"] .rs-spring__presets button { padding-block: .6rem; }