/* Proteus — site styles (v5, 19 Oct 2026).
   Charcoal bands carry the machine, ivory technical sheets carry the argument.
   Warm gold marks a latched connection, the mark and the one primary action per view. */

@font-face {
  font-family: "Archivo Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  src: url("../fonts/archivo-latin-wdth-normal.woff2") format("woff2-variations"), url("../fonts/archivo-latin-wdth-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Archivo Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  src: url("../fonts/archivo-latin-ext-wdth-normal.woff2") format("woff2-variations");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); }

:root {
  --paper: #f4f0e7;
  --paper-2: #ebe5d8;
  --card: #fbf8f1;
  --ink: #171613;
  --ink-2: #3b3830;
  --ink-3: #5c574c;
  --rule: #d2cab9;
  --night: #141412;
  --night-2: #1a1916;
  --night-3: #23221e;
  --night-ink: #f1ece1;
  --night-ink-2: #b7af9f;
  --night-rule: rgba(241, 236, 225, 0.15);
  --night-glass: rgba(20, 20, 18, 0.72);
  --signal: #f2b62b;
  --font-display: "Archivo Variable", "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Archivo Variable", "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --fs-display: clamp(2.7rem, 1.55rem + 4.1vw, 5.3rem);
  --fs-h2: clamp(2rem, 1.35rem + 2.3vw, 3.35rem);
  --fs-h3: clamp(1.2rem, 1.1rem + 0.35vw, 1.4rem);
  --fs-body: 1.0625rem;
  --fs-lead: clamp(1.1rem, 1rem + 0.4vw, 1.3rem);
  --fs-mono: 0.74rem;
  --max: 1240px;
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
  --section: clamp(4.5rem, 3rem + 6vw, 9rem);
  --nav-h: 64px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px)); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 60; background: var(--night); }
img, video, svg { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; border-radius: 2px; }
.mono { font-family: var(--font-mono); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); color: var(--ink); padding: 0.5rem 0.8rem; z-index: 100; }
.skip:focus { left: var(--gutter-l); }
.wrap { width: 100%; max-width: calc(var(--max) + 32px); margin-inline: auto; padding-left: var(--gutter-l); padding-right: var(--gutter-r); }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- type ---------- */
.display { font-family: var(--font-display); font-stretch: 106%; font-weight: 720; font-size: var(--fs-display); line-height: 0.97; letter-spacing: -0.028em; margin: 0; text-wrap: balance; }
.h2 { font-family: var(--font-display); font-stretch: 104%; font-weight: 690; font-size: var(--fs-h2); line-height: 1.04; letter-spacing: -0.02em; margin: 0; text-wrap: balance; }
.h3 { font-family: var(--font-display); font-stretch: 102%; font-weight: 660; font-size: var(--fs-h3); line-height: 1.22; letter-spacing: -0.005em; margin: 0; text-wrap: balance; }
.lead { font-size: var(--fs-lead); line-height: 1.5; margin: 0; max-width: 52ch; color: var(--ink-2); text-wrap: pretty; }
.body { margin: 0; max-width: 62ch; color: var(--ink-2); text-wrap: pretty; }
.eyebrow { display: flex; align-items: baseline; gap: 0.9rem; margin: 0; font-family: var(--font-mono); font-size: var(--fs-mono); font-weight: 500; letter-spacing: 0.13em; text-transform: uppercase; color: var(--ink-3); }
.eyebrow__n { color: var(--ink); }
.eyebrow::after { content: ""; flex: 0 0 2.2rem; height: 1px; background: currentColor; transform: translateY(-0.25em); opacity: 0.6; order: 1; }
.eyebrow__n { order: 0; }
.eyebrow__t { order: 2; }
.fineprint { margin: 0; font-family: var(--font-mono); font-size: var(--fs-mono); letter-spacing: 0.03em; color: var(--ink-3); }
.link { font-family: var(--font-mono); font-size: 0.86rem; text-decoration: none; border-bottom: 1.5px solid currentColor; padding-bottom: 1px; }
.link:hover { opacity: 0.72; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.55rem; font-family: var(--font-display); font-stretch: 104%; font-weight: 640; font-size: 0.98rem; line-height: 1.2; padding: 0.9rem 1.3rem; border-radius: 2px; text-decoration: none; border: 1.5px solid transparent; transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease; }
.btn--small { padding: 0.5rem 0.85rem; font-size: 0.88rem; }
.btn--light { background: var(--night-ink); color: var(--ink); }
.btn--light:hover { background: #fffdf8; }
.btn--gold { background: var(--signal); color: var(--night); }
.btn--gold:hover { background: #ffc94f; }
.btn--ghost { color: var(--night-ink); border-color: rgba(241, 236, 225, 0.34); }
.btn--ghost:hover { border-color: var(--night-ink); }
.btn__arrow { width: 0.9em; height: 0.9em; flex: none; }
.btn__aux { display: inline-flex; align-items: center; gap: 0.45rem; font-family: var(--font-mono); font-weight: 400; font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }

/* ---------- nav ---------- */
.nav { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50; background: rgba(20, 20, 18, 0.86); -webkit-backdrop-filter: saturate(140%) blur(14px); backdrop-filter: saturate(140%) blur(14px); border-bottom: 1px solid var(--night-rule); color: var(--night-ink); }
.nav__inner { height: var(--nav-h); display: flex; align-items: center; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: inherit; }
.brand__mark { width: 26px; height: 26px; color: var(--signal); flex: none; }
.brand__word { font-family: var(--font-display); font-stretch: 118%; font-weight: 760; font-size: 1.02rem; letter-spacing: 0.14em; text-transform: uppercase; }
.nav__links { display: flex; gap: 1.7rem; margin-left: auto; font-size: 0.93rem; }
.nav__links a { text-decoration: none; color: var(--night-ink-2); }
.nav__links a:hover { color: var(--night-ink); }
.brand__by { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--night-ink-2); white-space: nowrap; }
.nav__menu { display: none; align-items: center; gap: 0.5rem; background: transparent; border: 1.5px solid rgba(241, 236, 225, 0.32); color: var(--night-ink); font: inherit; font-size: 0.88rem; padding: 0.45rem 0.7rem; border-radius: 2px; cursor: pointer; }
.nav__menu-icon { width: 14px; height: 10px; position: relative; border-block: 1.5px solid currentColor; }
.nav__menu-icon::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1.5px solid currentColor; transform: translateY(-50%); }
.nav__menu[aria-expanded="true"] .nav__menu-icon { border-color: transparent; }
.nav__menu[aria-expanded="true"] .nav__menu-icon::after { transform: translateY(-50%) rotate(45deg); }
.nav__menu[aria-expanded="true"] .nav__menu-icon::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1.5px solid currentColor; transform: translateY(-50%) rotate(-45deg); }
.mobile-menu { border-top: 1px solid var(--night-rule); background: var(--night); }
.mobile-menu .wrap { display: grid; padding-block: 0.4rem 1rem; }
.mobile-menu a { text-decoration: none; color: var(--night-ink); font-family: var(--font-display); font-size: 1.15rem; padding: 0.8rem 0; border-bottom: 1px solid var(--night-rule); }
@media (max-width: 1100px) {
  .nav__links { display: none; }
  .nav__cta { margin-left: auto; }
  .nav__menu { display: inline-flex; }
}
@media (min-width: 1101px) { .mobile-menu { display: none !important; } }
@media (max-width: 520px) { .brand__by { display: none; } }
@media (max-width: 400px) { .nav__menu-label { display: none; } .nav__inner { gap: 0.7rem; } .nav__cta { padding-inline: 0.7rem; } }

/* ---------- media frames (video with badge and pause control) ---------- */
.media { position: relative; margin: 0; overflow: hidden; background: var(--night); isolation: isolate; }
.media video, .media img { width: 100%; height: 100%; object-fit: cover; }
.media--sq { aspect-ratio: 1 / 1; }
.media--43 { aspect-ratio: 4 / 3; }
.media__meta { position: absolute; left: 0.7rem; right: 0.7rem; bottom: 0.7rem; display: flex; align-items: center; gap: 0.5rem; z-index: 2; pointer-events: none; }
.badge { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--night-ink); padding: 0.24rem 0.5rem; border: 1px solid rgba(241, 236, 225, 0.38); background: var(--night-glass); white-space: nowrap; }
.badge--proto { background: var(--night-ink); color: var(--ink); border-color: var(--night-ink); }
.badge--gold { background: var(--signal); color: var(--night); border-color: var(--signal); }
.badge--study { border-style: dashed; border-color: rgba(241, 236, 225, 0.7); }
.badge--line { background: transparent; color: var(--ink); border-color: var(--ink); }
.legend { display: inline-flex; align-items: center; gap: 0.45rem; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em; color: var(--night-ink-2); background: var(--night-glass); padding: 0.24rem 0.5rem; white-space: nowrap; }
.legend__latch { width: 10px; height: 10px; border-radius: 50%; border: 2.5px solid var(--signal); flex: none; }
.vbtn { pointer-events: auto; margin-left: auto; width: 36px; height: 36px; flex: none; border-radius: 50%; border: 1.5px solid rgba(241, 236, 225, 0.45); background: var(--night-glass); color: var(--night-ink); cursor: pointer; display: grid; place-items: center; padding: 0; }
.vbtn:hover { border-color: var(--night-ink); }
.vbtn:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
.vbtn span[aria-hidden="true"] { width: 10px; height: 12px; border-inline: 3px solid currentColor; }
.vbtn[data-state="paused"] span[aria-hidden="true"] { width: 0; height: 0; border-inline: 0; border-left: 11px solid currentColor; border-block: 7px solid transparent; margin-left: 3px; }
.vbtn--text { width: auto; border-radius: 999px; display: inline-flex; align-items: center; gap: 0.55rem; padding: 0 0.95rem 0 0.8rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; }
.vbtn--text[data-state="paused"] span[aria-hidden="true"] { margin-left: 1px; }
html:not(.js) .vbtn, html:not(.js) .playover { display: none; }
.js .media video:not([controls]), .js .film video { cursor: pointer; }
@media (pointer: coarse) { .vbtn { width: 44px; height: 44px; } .vbtn--text { width: auto; } }

/* ---------- hero: headline, framed concept film, honest status ---------- */
.hero { position: relative; background-color: var(--night); color: var(--night-ink); color-scheme: dark; overflow: hidden;
  background-image: linear-gradient(rgba(241, 236, 225, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(241, 236, 225, 0.035) 1px, transparent 1px);
  background-size: 56px 56px; background-position: -1px -1px; }
.hero__grid { display: grid; grid-template-columns: minmax(0, 2.15fr) minmax(16rem, 1fr); grid-template-areas: "kicker kicker" "title title" "film side"; column-gap: clamp(1.5rem, 0.8rem + 2.4vw, 3.4rem); padding-block: clamp(2rem, 1.2rem + 2.6vw, 3.8rem) clamp(1.6rem, 1rem + 1.8vw, 2.8rem); }
.hero__kicker { grid-area: kicker; margin: 0 0 clamp(0.9rem, 0.6rem + 0.8vw, 1.4rem); display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 1.1rem; font-family: var(--font-mono); font-size: var(--fs-mono); letter-spacing: 0.13em; text-transform: uppercase; color: var(--night-ink-2); }
.hero__kicker b { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--night-ink); font-weight: 500; }
.hero__kicker b::before { content: ""; width: 0.5rem; height: 0.5rem; background: var(--signal); transform: rotate(45deg); }
.hero .display { grid-area: title; max-width: 16em; font-size: clamp(2.35rem, 1.05rem + 4vw, 4.85rem); margin-bottom: clamp(1.3rem, 0.9rem + 1.5vw, 2.3rem); }
.film { grid-area: film; position: relative; margin: 0; aspect-ratio: 16 / 9; background: #0e0e0c; border: 1px solid var(--night-rule); overflow: hidden; isolation: isolate; min-width: 0; }
.film::after { content: ""; position: absolute; left: -1px; top: -1px; width: 34px; height: 34px; border-left: 2px solid var(--signal); border-top: 2px solid var(--signal); pointer-events: none; z-index: 2; }
.film video { width: 100%; height: 100%; object-fit: cover; }
.film__bar { position: absolute; left: 0.75rem; right: 0.75rem; bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem; z-index: 3; pointer-events: none; }
.playover { position: absolute; inset: 0; z-index: 1; width: 100%; border: 0; margin: 0; padding: 0 0 2.6rem; display: grid; place-content: center; justify-items: center; gap: 0.8rem; color: var(--night-ink); background: linear-gradient(0deg, rgba(20, 20, 18, 0.5), rgba(20, 20, 18, 0.05) 60%); font: inherit; cursor: pointer; }
.playover__icon { width: 4.2rem; height: 4.2rem; border-radius: 50%; background: var(--signal); display: grid; place-items: center; box-shadow: 0 0 0 9px rgba(242, 182, 43, 0.2); transition: transform 0.2s ease; }
.playover__icon::before { content: ""; border-left: 18px solid var(--night); border-block: 11px solid transparent; margin-left: 5px; }
.playover:hover .playover__icon { transform: scale(1.05); }
.playover:focus-visible { outline: 2px solid var(--signal); outline-offset: -4px; }
.playover__label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; background: var(--night-glass); padding: 0.3rem 0.6rem; }
.film.has-played .playover { display: none; }
/* Wide screens autoplay the film (unless reduced motion), so the big play target is only for small screens. */
@media (min-width: 861px) and (prefers-reduced-motion: no-preference) { .playover { display: none; } }
.hero__side { grid-area: side; align-self: end; display: grid; gap: 1.4rem; min-width: 0; }
.hero__lead { margin: 0; font-size: var(--fs-lead); line-height: 1.45; color: var(--night-ink); text-wrap: pretty; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.hero__note { margin: 0; padding-top: 1rem; border-top: 1px solid var(--night-rule); font-size: 0.88rem; line-height: 1.5; color: var(--night-ink-2); }
.hero__note b { display: block; margin-bottom: 0.3rem; font-family: var(--font-mono); font-weight: 500; font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--signal); }
.status { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--night-rule); }
.status div { padding: 1rem 1.4rem 1.7rem 0; display: grid; gap: 0.3rem; align-content: start; min-width: 0; }
.status div + div { padding-left: 1.4rem; border-left: 1px solid var(--night-rule); }
.status dt { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--night-ink-2); }
.status dd { margin: 0; font-size: 0.95rem; line-height: 1.45; color: var(--night-ink); }
.status a { color: var(--night-ink); text-underline-offset: 3px; text-decoration-color: var(--signal); }
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "kicker" "title" "film" "side"; }
  .hero__side { margin-top: 1.5rem; }
  .hero__lead { max-width: 40rem; }
}
@media (max-width: 720px) {
  .status { grid-template-columns: minmax(0, 1fr); }
  .status div, .status div + div { padding: 0.85rem 0; border-left: 0; border-bottom: 1px solid var(--night-rule); }
  .status div:last-child { border-bottom: 0; padding-bottom: 1.4rem; }
}
@media (max-width: 480px) {
  .hero__cta .btn { flex: 1 1 100%; }
  .film__bar .legend { display: none; }
  .playover__icon { width: 3.6rem; height: 3.6rem; }
}

/* ---------- sections ---------- */
.sec { padding-block: var(--section); position: relative; }
.sec--alt { background: var(--paper-2); }
.sec--night { background: var(--night); color: var(--night-ink); color-scheme: dark; }
.sec--night .lead, .sec--night .body { color: var(--night-ink-2); }
.sec--night .eyebrow { color: var(--night-ink-2); }
.sec--night .eyebrow__n { color: var(--night-ink); }
.head { display: grid; gap: 1.2rem; max-width: 880px; margin-bottom: clamp(2.4rem, 1.6rem + 2.8vw, 4rem); }

/* problem */
.problem { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(2rem, 1rem + 4.5vw, 5.5rem); align-items: start; }
.problem__text { display: grid; gap: 1.2rem; min-width: 0; }
.problem__text .head { margin-bottom: 0.4rem; }
.stats { margin: 1rem 0 0; display: grid; border-top: 2px solid var(--ink); }
.stat { display: grid; grid-template-columns: minmax(7rem, 0.55fr) minmax(0, 1.45fr); gap: 1.2rem; padding-block: 1.15rem; border-bottom: 1px solid var(--rule); align-items: baseline; }
.stat dt { font-family: var(--font-display); font-stretch: 104%; font-weight: 720; font-size: clamp(2rem, 1.5rem + 1.6vw, 2.8rem); line-height: 1; letter-spacing: -0.025em; font-variant-numeric: tabular-nums; }
.stat dd { margin: 0; color: var(--ink-2); font-size: 0.98rem; }
.stat sup a { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-2); padding-left: 2px; text-decoration: none; }
.spec { border: 1.5px solid var(--ink); background: var(--card); min-width: 0; }
.spec__title { margin: 0; display: flex; justify-content: space-between; gap: 1rem; padding: 0.85rem 1.15rem; border-bottom: 1.5px solid var(--ink); font-family: var(--font-mono); font-size: var(--fs-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink); background: var(--paper-2); }
.spec__rows { margin: 0; }
.spec__rows div { display: grid; grid-template-columns: minmax(7.5rem, 0.55fr) minmax(0, 1.45fr); gap: 1rem; padding: 0.85rem 1.15rem; border-bottom: 1px solid var(--rule); }
.spec__rows dt { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); padding-top: 0.22rem; }
.spec__rows dd { margin: 0; color: var(--ink); font-size: 0.99rem; line-height: 1.45; }
.spec__key { background: var(--ink); }
.spec__key dt { color: var(--night-ink-2) !important; }
.spec__key dd { color: var(--night-ink) !important; font-weight: 620; }
.spec__note { margin: 0; padding: 0.75rem 1.15rem; font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3); }
.sources { margin: clamp(2.4rem, 1.8rem + 2vw, 3.4rem) 0 0; padding: 1rem 0 0 1.2rem; border-top: 1px solid var(--rule); font-size: 0.82rem; color: var(--ink-3); display: grid; gap: 0.3rem; max-width: 920px; }
.sources a { color: var(--ink-2); }
@media (max-width: 960px) { .problem { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 480px) { .stat { grid-template-columns: minmax(0, 1fr); gap: 0.4rem; } .spec__rows div { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; } }

/* how it works: three steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1rem, 0.6rem + 1.4vw, 2rem); counter-reset: step; }
.step { display: grid; gap: 1.2rem; align-content: start; min-width: 0; }
.step .media { border: 1px solid var(--night-rule); }
.step__text { display: grid; gap: 0.45rem; border-top: 1px solid var(--night-rule); padding-top: 1rem; }
.step__n { margin: 0; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.1em; color: var(--night-ink-2); }
.step__text p:last-child { margin: 0; color: var(--night-ink-2); font-size: 0.99rem; max-width: 40ch; }
.leave { margin: clamp(1.6rem, 1.2rem + 1.2vw, 2.4rem) 0 0; display: flex; align-items: baseline; gap: 0.9rem; color: var(--night-ink-2); font-size: 0.99rem; max-width: 70ch; }
.leave b { font-family: var(--font-mono); font-weight: 500; font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--night-ink); white-space: nowrap; }
@media (max-width: 900px) { .steps { grid-template-columns: minmax(0, 1fr); gap: 2.4rem; } .step { grid-template-columns: minmax(0, 1fr); } }

/* why a structure */
.why { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(2rem, 1rem + 4vw, 5rem); align-items: center; margin-top: clamp(4rem, 2.5rem + 4vw, 6.5rem); padding-top: clamp(2.6rem, 2rem + 2vw, 3.6rem); border-top: 1px solid var(--night-rule); }
.why__text { display: grid; gap: 1rem; min-width: 0; }
.why__text p { margin: 0; color: var(--night-ink-2); max-width: 56ch; }
.why__text .h3 { font-size: clamp(1.4rem, 1.15rem + 0.8vw, 1.85rem); }
.target { margin-top: 0.6rem; border: 1px solid rgba(241, 236, 225, 0.3); padding: 1rem 1.15rem; display: grid; gap: 0.5rem; }
.target p { color: var(--night-ink) !important; }
.target__k { font-family: var(--font-mono); font-size: 0.7rem !important; letter-spacing: 0.1em; text-transform: uppercase; color: var(--night-ink-2) !important; }
.target__next { color: var(--night-ink-2) !important; font-size: 0.95rem; }
.diagram { margin: 0; min-width: 0; }
.diagram__panels { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(0.8rem, 0.4rem + 1.5vw, 2rem); }
.diagram__panel { display: grid; gap: 0.4rem; align-content: start; min-width: 0; }
.diagram__panel p { margin: 0; font-size: 0.9rem; line-height: 1.45; color: var(--night-ink-2); }
.diagram svg { width: 100%; height: auto; }
.diagram .node { fill: var(--night); stroke: var(--night-ink); stroke-width: 2.4; }
.diagram .node--latch { stroke: var(--signal); stroke-width: 3.4; }
.diagram .member { stroke: var(--night-ink); stroke-width: 6; stroke-linecap: round; }
.dia-label { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.1em; fill: var(--night-ink-2); }
.dia-small { font-family: var(--font-mono); font-size: 15px; fill: var(--night-ink); font-weight: 500; }
.dim line { stroke: #7f786b; stroke-width: 1; }
.dim text { font-family: var(--font-mono); font-size: 13px; fill: var(--night-ink-2); text-anchor: middle; }
.diagram figcaption { font-family: var(--font-mono); font-size: var(--fs-mono); color: var(--night-ink-2); letter-spacing: 0.03em; margin-top: 0.7rem; }
@media (max-width: 960px) { .why { grid-template-columns: minmax(0, 1fr); } }

/* platform: one module, many shapes */
.shapes { display: grid; gap: clamp(3rem, 2rem + 4vw, 6rem); }
.shape { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); gap: clamp(1.6rem, 1rem + 3vw, 4.5rem); align-items: center; }
.shape:nth-child(even) { grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr); }
.shape:nth-child(even) .media { order: 2; }
.shape .media { border: 1px solid var(--ink); }
.shape__text { display: grid; gap: 1rem; min-width: 0; }
.shape__k { margin: 0; display: flex; gap: 0.8rem; align-items: baseline; font-family: var(--font-mono); font-size: var(--fs-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.shape__k b { color: var(--ink); font-weight: 500; }
.shape__title { font-size: clamp(1.7rem, 1.3rem + 1.3vw, 2.4rem); line-height: 1.05; letter-spacing: -0.018em; }
.wwh { margin: 0.2rem 0 0; display: grid; border-top: 2px solid var(--ink); }
.wwh div { display: grid; grid-template-columns: 4.2rem minmax(0, 1fr); gap: 0.9rem; padding-block: 0.8rem; border-bottom: 1px solid var(--rule); }
.wwh dt { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); padding-top: 0.2rem; }
.wwh dd { margin: 0; color: var(--ink-2); font-size: 0.99rem; line-height: 1.5; }
.rules { list-style: none; margin: clamp(3.5rem, 2.5rem + 3vw, 5.5rem) 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 2px solid var(--ink); }
.rules li { padding: 1.3rem 1.6rem 0 0; display: grid; gap: 0.45rem; align-content: start; min-width: 0; }
.rules li + li { padding-left: 1.6rem; border-left: 1px solid var(--rule); }
.rules p { margin: 0; color: var(--ink-2); font-size: 0.97rem; }
.rules__k { display: flex; align-items: center; gap: 0.55rem; }
.rules__k .legend__latch { width: 12px; height: 12px; }
.note { margin: 1.6rem 0 0; }
@media (max-width: 900px) {
  .shape, .shape:nth-child(even) { grid-template-columns: minmax(0, 1fr); }
  .shape:nth-child(even) .media { order: 0; }
  .rules { grid-template-columns: minmax(0, 1fr); }
  .rules li, .rules li + li { padding: 1.1rem 0; border-left: 0; border-bottom: 1px solid var(--rule); }
}

/* progress */
.clips { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(0.8rem, 0.5rem + 1vw, 1.5rem); }
.clip { display: grid; gap: 0.9rem; align-content: start; min-width: 0; }
.clip__text { display: grid; gap: 0.3rem; }
.clip__meta { margin: 0; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--ink-3); }
.clip__text p:last-child { margin: 0; color: var(--ink-2); font-size: 0.97rem; }
.record { margin-top: clamp(3rem, 2rem + 3vw, 5rem); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1.6rem, 1rem + 2.5vw, 3.5rem); }
.record__h { margin: 0 0 1.1rem; font-family: var(--font-mono); font-size: var(--fs-mono); font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.timeline { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--ink); display: grid; gap: 1.1rem; }
.timeline li { position: relative; padding-left: 1.25rem; display: grid; gap: 0.15rem; }
.timeline li::before { content: ""; position: absolute; left: -6px; top: 0.42rem; width: 10px; height: 10px; background: var(--ink); transform: rotate(45deg); }
.timeline--next { border-left-style: dashed; }
.timeline--next li::before { background: var(--paper); border: 2px solid var(--ink); }
.timeline time { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.timeline p { margin: 0; font-size: 0.97rem; color: var(--ink); }
.specs { margin: 0; display: grid; border-top: 2px solid var(--ink); }
.specs div { display: grid; grid-template-columns: minmax(7rem, 0.8fr) minmax(0, 1.2fr); gap: 1rem; padding-block: 0.7rem; border-bottom: 1px solid var(--rule); }
.specs dt { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); padding-top: 0.18rem; }
.specs dd { margin: 0; font-size: 0.97rem; }
@media (max-width: 960px) { .clips, .record { grid-template-columns: minmax(0, 1fr); } .clips { gap: 2rem; } }

/* market */
.market { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 0.85fr); border-top: 2px solid var(--ink); }
.market__item { padding: 1.4rem 1.6rem 0 0; display: grid; gap: 0.6rem; align-content: start; min-width: 0; }
.market__item + .market__item { padding-left: 1.6rem; border-left: 1px solid var(--rule); }
.market__item p { margin: 0; color: var(--ink-2); }
.market__k { font-family: var(--font-mono); font-size: var(--fs-mono) !important; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3) !important; }
.market__item--later p:not(.market__k) { font-size: 0.97rem; color: var(--ink-3); }
@media (max-width: 900px) { .market { grid-template-columns: minmax(0, 1fr); } .market__item, .market__item + .market__item { padding: 1.2rem 0; border-left: 0; border-bottom: 1px solid var(--rule); } }

/* vision */
.vision { background: radial-gradient(90% 70% at 15% 0%, #25231e 0%, var(--night) 62%) var(--night); }
.vision .h2 { max-width: 20ch; }
.zero { margin: clamp(2.4rem, 1.2rem + 3vw, 3.8rem) 0 0; display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: clamp(1.2rem, 0.5rem + 3vw, 3.2rem); border-block: 1px solid var(--night-rule); padding-block: clamp(0.8rem, 0.5rem + 1vw, 1.6rem); }
.zero__num { margin: 0; font-family: var(--font-display); font-stretch: 112%; font-weight: 700; line-height: 0.82; font-size: clamp(7rem, 4.5rem + 10vw, 14rem); color: transparent; -webkit-text-stroke: 1.5px var(--night-ink); letter-spacing: -0.02em; }
.zero__text { margin: 0; max-width: 34ch; font-family: var(--font-display); font-weight: 480; font-size: clamp(1.15rem, 0.95rem + 0.9vw, 1.7rem); line-height: 1.32; color: var(--night-ink-2); text-wrap: pretty; }
.zero__text strong { color: var(--night-ink); font-weight: 680; }
.roadmap { list-style: none; margin: clamp(2.6rem, 1.8rem + 2.5vw, 4rem) 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1.5px solid var(--night-ink); }
.roadmap li { padding: 1rem 1.3rem 0 0; display: grid; gap: 0.45rem; align-content: start; min-width: 0; }
.roadmap li + li { padding-left: 1.3rem; border-left: 1px solid var(--night-rule); }
.roadmap span { font-family: var(--font-mono); font-size: 0.84rem; color: var(--night-ink-2); letter-spacing: 0.08em; }
.roadmap p { margin: 0; color: var(--night-ink); font-size: 0.98rem; }
.vision .fineprint { color: var(--night-ink-2); margin-top: 1.6rem; }
@media (max-width: 860px) { .roadmap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); row-gap: 1.4rem; } .roadmap li:nth-child(3) { padding-left: 0; border-left: 0; } }
@media (max-width: 520px) { .roadmap { grid-template-columns: minmax(0, 1fr); } .roadmap li, .roadmap li + li { padding-left: 0; border-left: 0; } .zero { grid-template-columns: minmax(0, 1fr); } .zero__num { font-size: 7.5rem; } }

/* team */
.team { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(1.5rem, 1rem + 2.5vw, 3.5rem); }
.person { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.4rem 1.4rem; align-content: start; border-top: 2px solid var(--ink); padding-top: 1.4rem; min-width: 0; }
.person__mono { grid-row: span 3; width: 4.4rem; height: 4.4rem; display: grid; place-items: center; border: 1.5px solid var(--ink); font-family: var(--font-mono); font-weight: 500; font-size: 1.05rem; letter-spacing: 0.08em; color: var(--ink); background: var(--card); }
.person p { margin: 0; color: var(--ink-2); max-width: 54ch; }
.person .link { justify-self: start; margin-top: 0.5rem; }
@media (max-width: 860px) { .team { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 440px) { .person { grid-template-columns: minmax(0, 1fr); } .person__mono { grid-row: auto; width: 3.4rem; height: 3.4rem; font-size: 0.9rem; } }

/* contact */
.contact { background: var(--night-2); color: var(--night-ink); color-scheme: dark; padding-block: clamp(4rem, 3rem + 4vw, 7rem); }
.contact__inner { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: clamp(2rem, 1rem + 3vw, 4.5rem); align-items: end; }
.contact .h2 { max-width: 15ch; }
.contact__side { display: grid; gap: 1.5rem; }
.contact__side p { margin: 0; color: var(--night-ink-2); }
.contact__cta { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; }
.contact__cta .btn { justify-content: space-between; }
.signoff { margin: clamp(3.5rem, 2.5rem + 4vw, 6rem) 0 0; padding-top: 1.4rem; border-top: 1px solid var(--night-rule); display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.signoff p { margin: 0; font-family: var(--font-display); font-stretch: 104%; font-weight: 640; font-size: clamp(1.2rem, 1rem + 0.9vw, 1.7rem); letter-spacing: -0.01em; }
.signoff .fineprint { font-family: var(--font-mono); font-size: var(--fs-mono); font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: var(--night-ink-2); }
@media (max-width: 860px) { .contact__inner { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 480px) { .contact__cta { grid-template-columns: minmax(0, 1fr); } }

/* footer: drawing title block */
.foot { background: var(--paper); padding-block: 2.6rem 2.2rem; }
.titleblock { display: grid; grid-template-columns: 1.1fr 2fr 1fr 0.8fr 0.7fr 1.5fr; border: 2px solid var(--ink); }
.tb { padding: 0.8rem 1rem; border-right: 1px solid var(--ink); display: grid; gap: 0.2rem; align-content: center; min-width: 0; font-size: 0.9rem; }
.tb:last-child { border-right: 0; }
.tb__k { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.tb--brand { display: flex; align-items: center; gap: 0.6rem; }
.tb--brand .brand__mark { color: var(--ink); }
.tb--links { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; align-items: center; font-family: var(--font-mono); font-size: 0.8rem; }
.tb--links a { color: var(--ink); }
.foot .fineprint { margin-top: 1.2rem; }
@media (max-width: 980px) {
  .titleblock { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tb { border-bottom: 1px solid var(--ink); }
  .tb--brand, .tb--title, .tb--links { grid-column: 1 / -1; border-right: 0; }
  .tb:nth-child(5) { border-right: 0; }
  .tb--links { border-bottom: 0; }
}

/* sub pages */
.page { padding-block: clamp(3rem, 2rem + 4vw, 6rem); }
.page h1 { font-family: var(--font-display); font-stretch: 104%; font-weight: 700; font-size: clamp(2rem, 1.4rem + 2.4vw, 3.2rem); line-height: 1.05; margin: 0 0 2rem; }
.page h2 { font-family: var(--font-display); font-stretch: 102%; font-weight: 650; font-size: 1.25rem; margin: 2.2rem 0 0.6rem; }
.page p, .page li { max-width: 70ch; color: var(--ink-2); }
.page address { font-style: normal; color: var(--ink); line-height: 1.7; }
.page .fineprint { margin-top: 1.4rem; }

/* reveal on scroll (only when JS runs and motion is allowed) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1); }
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---- v4: mission chapters and the static check ---- */
.media--169 { aspect-ratio: 16 / 9; }
.mission .shape__k b { letter-spacing: 0.02em; }
.wwh dd.num { color: var(--ink); font-weight: 560; }
.assume { margin-top: clamp(3.5rem, 2.5rem + 3vw, 5.5rem); border: 1.5px solid var(--ink); background: var(--card); min-width: 0; }
.assume__head { border-bottom: 1.5px solid var(--ink); }
.assume__head .spec__title { border-bottom: 1px solid var(--rule); }
.assume__lead { margin: 0; padding: 1rem 1.15rem 1.1rem; color: var(--ink-2); font-size: 0.99rem; line-height: 1.5; max-width: 70ch; }
.assume__rows { margin: 0; }
.assume__rows div { display: grid; grid-template-columns: minmax(8rem, 0.5fr) minmax(0, 1.5fr) minmax(6.5rem, auto); gap: 1rem; align-items: baseline; padding: 0.85rem 1.15rem; border-bottom: 1px solid var(--rule); }
.assume__rows dt { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.assume__rows dd { margin: 0; color: var(--ink); font-size: 0.99rem; line-height: 1.45; min-width: 0; }
.assume__rows dd.assume__v { font-family: var(--font-mono); font-size: 0.95rem; font-weight: 500; text-align: right; white-space: nowrap; }
.assume__key { background: var(--ink); }
.assume__key dt { color: var(--night-ink-2) !important; }
.assume__key dd { color: var(--night-ink) !important; }
@media (max-width: 640px) {
  .assume__rows div { grid-template-columns: minmax(0, 1fr) auto; }
  .assume__rows dt { grid-column: 1 / -1; }
  .assume__rows dd.assume__v { text-align: right; }
}
/* v4: four hero facts */
.facts { grid-template-columns: repeat(4, minmax(0, max-content)); }
@media (max-width: 720px) {
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 0.9rem; }
  .facts div:nth-child(3) { padding-left: 0; border-left: 0; }
}

/* v4 (19 Oct 2026): contact email, lab record page */
.contact__cta .btn--wide { grid-column: 1 / -1; }
.nav__links a[aria-current="page"], .mobile-menu a[aria-current="page"] { color: var(--night-ink); }
.media--45 { aspect-ratio: 4 / 5; }
.media__meta--top { top: 0.7rem; bottom: auto; }
.media video.pos-top { object-position: 50% 0%; }
.labgrid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(1.4rem, 0.8rem + 1.4vw, 2rem); }
.lab-entry { display: grid; gap: 0.9rem; align-content: start; min-width: 0; }
.lab-entry .h3 { font-size: 1.12rem; }
.lab-entry p { margin: 0; }
.cond { margin: 0.5rem 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1.5px solid var(--ink); }
.cond div { padding-top: 0.45rem; display: grid; gap: 0.1rem; min-width: 0; }
.cond dt { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.cond dd { margin: 0; font-size: 0.9rem; }
.concept { max-width: 980px; }
@media (max-width: 1100px) { .labgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .labgrid { grid-template-columns: minmax(0, 1fr); } }

/* ---- v5 (19 Oct 2026): engineering studies, mission flag, applications, contact ---- */
.studies { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(2rem, 1rem + 3vw, 4rem); }
.study { display: grid; gap: 1.2rem; align-content: start; min-width: 0; }
.study .media { border: 1px solid var(--ink); }
.study__text { display: grid; gap: 0.7rem; min-width: 0; }
.study__k { margin: 0; display: flex; gap: 0.8rem; align-items: baseline; font-family: var(--font-mono); font-size: var(--fs-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.study__k b { color: var(--ink); font-weight: 500; }
.study__text > p:not(.study__k) { margin: 0; color: var(--ink-2); max-width: 52ch; }
.study__model { margin: 0.3rem 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1.5px solid var(--ink); }
.study__model div { padding: 0.55rem 0.8rem 0 0; display: grid; gap: 0.1rem; align-content: start; min-width: 0; }
.study__model div + div { padding-left: 0.8rem; border-left: 1px solid var(--rule); }
.study__model dt { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.study__model dd { margin: 0; font-family: var(--font-display); font-stretch: 104%; font-weight: 640; font-size: 1.15rem; line-height: 1.2; color: var(--ink); overflow-wrap: break-word; }
.limits { margin: clamp(2.4rem, 1.6rem + 2vw, 3.4rem) 0 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.4rem 1.2rem; align-items: baseline; padding: 1rem 1.2rem; background: var(--paper-2); border-left: 3px solid var(--ink); max-width: 980px; color: var(--ink-2); font-size: 0.97rem; }
.limits b { font-family: var(--font-mono); font-weight: 500; font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink); white-space: nowrap; }
.limits a { color: var(--ink); }
@media (max-width: 900px) { .studies { grid-template-columns: minmax(0, 1fr); gap: 3rem; } }
@media (max-width: 520px) { .limits { grid-template-columns: minmax(0, 1fr); } }

.mission__flag { margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.9rem; font-size: 0.94rem; color: var(--ink-2); max-width: 72ch; }
.mission__flag a { color: var(--ink); }
.market__platform { margin: clamp(1.8rem, 1.4rem + 1.2vw, 2.6rem) 0 0; max-width: 70ch; color: var(--ink-2); }
.market__item--later .h3 { color: var(--ink-2); }
.btn__mail { min-width: 0; overflow-wrap: anywhere; text-align: left; }
@media (max-width: 420px) { .btn__mail { font-size: 0.9rem; } .contact__cta .btn--wide { padding-inline: 1rem; } }
.contact__cta .btn--wide { gap: 1rem; }

/* hero video poster fallback colour while the poster loads */
.film video[poster] { background: #0e0e0c; }