/* GENERATED by scripts/build-css.mjs. Edit the sources, not this. */
/* fonts.css */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400 700;
  font-display: optional;
  src: url('../fonts/inter-latin.woff2') format('woff2-variations');
  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: 'Inter';
  font-style: normal;
  font-weight: 400 700;
  font-display: optional;
  src: url('../fonts/inter-latin-ext.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: 'Outfit';
  font-style: normal;
  font-weight: 100 900;
  font-display: optional;
  src: url('../fonts/outfit-latin.woff2') format('woff2-variations');
  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: 'Outfit';
  font-style: normal;
  font-weight: 100 900;
  font-display: optional;
  src: url('../fonts/outfit-latin-ext.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: 'Inter Fallback';
  src: local('Arial'), local('Helvetica'), local('Liberation Sans');
  size-adjust: 107%;
  ascent-override: 90%;
  descent-override: 22.43%;
  line-gap-override: 0%;
}
@font-face {
  font-family: 'Outfit Fallback';
  src: local('Arial'), local('Helvetica'), local('Liberation Sans');

  size-adjust: 104.2%;
  ascent-override: 95.88%;
  descent-override: 24.20%;
  line-gap-override: 0%;
}

@font-face {
  font-family: 'Han Punctuation';
  src: local('PingFang SC'), local('PingFangSC-Regular'), local('Hiragino Sans GB'),
       local('Microsoft YaHei'), local('Noto Sans CJK SC'), local('Source Han Sans SC'),
       local('Noto Sans SC'), local('WenQuanYi Zen Hei');
  unicode-range: U+2014, U+2018-2019, U+201C-201D, U+2026;
}

/* base.css */
:root {

  --bg: #181716;
  --bg-sink: #121110;
  --surface: rgba(242, 240, 237, 0.035);
  --surface-2: rgba(242, 240, 237, 0.06);
  --hairline: rgba(242, 240, 237, 0.09);
  --hairline-2: rgba(242, 240, 237, 0.16);


  --fg: #f2f0ed;
  --fg-soft: #d2cec7;
  --fg-dim: #b8b4ad;
  --fg-faint: #a7a198;



  --c-1-rgb: 246 158 70;
  --c-2-rgb: 255 10 124;
  --c-3-rgb:     240 42 168;
  --c-1:         rgb(var(--c-1-rgb));
  --c-2:         rgb(var(--c-2-rgb));

  --brand-ink:   #ff73b0;
  --c-3:         rgb(var(--c-3-rgb));
  --grad:        linear-gradient(100deg, var(--c-1), var(--c-2) 52%, var(--c-3));

  --on-grad:     #12080d;


  --c-human:     #ffb23d;
  --c-ai:        #7ab8ff;
  --c-evidence:  #4ade9a;
  --c-fail:      #ff5d5d;





  --track-open:  1;
  --track-tight: 1;

  --han-punct: ;



  --font-cjk:     "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                  "Noto Sans CJK SC", "Source Han Sans SC", "Noto Sans SC", "Heiti SC",
                  "WenQuanYi Micro Hei", "WenQuanYi Zen Hei";
  --font-display: var(--han-punct) "Outfit", "Outfit Fallback", var(--font-cjk),
                  ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body:    var(--han-punct) "Inter", "Inter Fallback", var(--font-cjk),
                  ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;


  --font-mono:    var(--han-punct) ui-monospace, SFMono-Regular, "SF Mono", Menlo,
                  "Cascadia Mono", Consolas, "DejaVu Sans Mono", "Liberation Mono", var(--font-cjk),
                  monospace;


  --r-nub:   2px;
  --r-xs:    6px;
  --r-sm:    10px;
  --r-md:    14px;
  --r-lg:    22px;
  --r-pill:  999px;
  --r-round: 50%;


  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;



  --t-hero:   clamp(min(2.5rem, 12vw), 6vw, 5rem);
  --t-h2:     clamp(min(2rem, 10vw), 4.4vw, 3.75rem);
  --t-h3:     clamp(1.35rem, 2.1vw, 1.9rem);
  --t-lead:   clamp(1.05rem, 1.55vw, 1.4rem);
  --t-body:   clamp(0.975rem, 1.1vw, 1.0625rem);
  --t-small:  0.875rem;
  --t-micro:  0.75rem;


  --t-nano:   0.625rem;
  --t-tiny:   0.6875rem;
  --t-xs:     0.8125rem;
  --t-md:     0.9375rem;
  --t-base:   1rem;
  --t-lg:     1.125rem;
  --t-xl:     1.25rem;

  --t-inline-code: 0.9em;



  --gutter:      clamp(min(1.25rem, 5vw), 4vw, 3rem);

  --bp-narrow:   43.75rem;
  --bp-stack:    47.5rem;
  --bp-scene:    53.75rem;

  --measure:     72rem;
  --measure-text: 44rem;
  --section-y:   clamp(5.5rem, 11vw, 10rem);


  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-io:   cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:  180ms;
  --dur:       520ms;
  --dur-slow:  620ms;

  --nav-h:     64px;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {

  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;

  scroll-padding-top: calc(var(--nav-h) + 12px);
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;

  overflow-x: clip;


  -webkit-tap-highlight-color: rgb(var(--c-2-rgb) / 0.22);
}
@supports not (overflow: clip) {
  body { overflow-x: hidden; }
}

img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: calc(-0.028em * var(--track-tight));
  text-wrap: balance;
}

h1, h2, h3 { overflow-wrap: break-word; }
h1 { font-size: var(--t-hero); letter-spacing: calc(-0.04em * var(--track-tight)); }
h2 { font-size: var(--t-h2); }
h3 { font-size: var(--t-h3); letter-spacing: calc(-0.02em * var(--track-tight)); line-height: 1.2; }

:lang(zh) body, :lang(zh) p { line-height: 1.75; }

:where(:lang(zh)) h1 { font-size: calc(var(--t-hero) * 0.86); line-height: 1.16; }
:where(:lang(zh)) h2 { font-size: calc(var(--t-h2)   * 0.9);  line-height: 1.24; }
:where(:lang(zh)) h3 { font-size: calc(var(--t-h3)   * 0.94); }

body { text-wrap: pretty; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 50%; top: 8px;
  transform: translate(-50%, -140%);
  z-index: 200;
  padding: 0.625rem 1.125rem;
  border-radius: var(--r-pill);
  background: var(--fg); color: var(--bg-sink);
  font-weight: 600; font-size: var(--t-small);
  transition: transform var(--dur-fast) var(--ease-out);
}
.skip-link:focus-visible { transform: translate(-50%, 0); }

:focus-visible {
  outline: 2px solid var(--c-2);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

@media (prefers-contrast: more) {
  :root {
    --fg-soft:    #ded9e6;
    --fg-dim:     #c3bdd0;
    --fg-faint:   #a9a2b8;
    --hairline:   rgba(255, 255, 255, 0.28);
    --hairline-2: rgba(255, 255, 255, 0.45);
    --surface:    rgba(255, 255, 255, 0.09);
    --surface-2:  rgba(255, 255, 255, 0.14);
  }
}

* { scrollbar-color: #322d3d var(--bg); scrollbar-width: thin; }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: #322d3d;
  border-radius: var(--r-pill);
  border: 3px solid var(--bg);
}
@media (hover: hover) { ::-webkit-scrollbar-thumb:hover { background: #453e54; } }

::selection { background: rgb(var(--c-2-rgb) / 0.3); color: #fff; }

:lang(zh) body,
:lang(zh) p,
:lang(zh) li,
:lang(zh) h1, :lang(zh) h2, :lang(zh) h3 {
  line-break: strict;
  word-break: normal;
  overflow-wrap: break-word;
}

:lang(zh) [data-phrase] { word-break: keep-all; }

:lang(zh) { font-synthesis: none; }

:lang(zh) :is(h1, h2, h3) { font-family: var(--han-punct) var(--font-cjk), var(--font-display); }

p, li, summary, .card__body, .rail__body { overflow-wrap: break-word; }

.card__index, .rail__num, .unit__n, .eyebrow, .tag, .surface__path {
  font-variant-numeric: tabular-nums;
}

p, .lead, .keyline { hanging-punctuation: first last; }

:lang(zh) { --track-open: 0.3; --track-tight: 0; --han-punct: "Han Punctuation",; }

@media (pointer: coarse) {
  :root { --t-nano: 0.75rem; --t-tiny: 0.75rem; }
}
:lang(zh) { --t-nano: 0.75rem; --t-tiny: 0.75rem; }

/* layout.css */
.wrap {
  width: 100%;

  min-width: 0;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--text { max-width: var(--measure-text); }

.section {
  position: relative;
  padding-block: var(--section-y);

  border-top: 1px solid transparent;
  border-image: linear-gradient(90deg, transparent, var(--hairline) 25%, var(--hairline) 75%, transparent) 1;
}
.section:first-of-type { border-top: 0; }

.section__head { max-width: 48rem; margin-bottom: clamp(2.5rem, 5vw, 4.5rem); }

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: calc(0.16em * var(--track-open));
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 1.125rem;
}
.eyebrow::before {
  content: ""; width: 1.5rem; height: 1px;
  background: var(--grad);
}

.lead {
  font-size: var(--t-lead);
  color: var(--fg-soft);
  margin-top: 1.25rem;
  max-width: 40rem;
}

.section__more {
  color: var(--fg-dim);
  margin-top: 1rem;
  max-width: 40rem;
}

.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  min-height: var(--nav-h);
  display: flex; align-items: center;
  transition: background var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out),
              backdrop-filter var(--dur) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.nav[data-stuck="true"] {

  background: rgba(8, 7, 11, 0.86);
  backdrop-filter: saturate(150%) blur(18px);
  -webkit-backdrop-filter: saturate(150%) blur(18px);
  border-bottom-color: var(--hairline);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .nav[data-stuck="true"] { background: #08070b; }
}

.nav__inner {
  width: 100%; max-width: 84rem;
  margin-inline: auto; padding-inline: var(--gutter);
  display: flex; align-items: center; gap: 1.25rem;
  min-width: 0;
}
.nav__links { min-width: 0; }

.brand { display: flex; align-items: center; gap: 0.625rem; min-width: 0; }

.brand__home { display: flex; align-items: center; gap: 0.5rem; min-width: 0; }

.brand__logo { display: block; height: 30px; width: auto; flex-shrink: 0; }
.brand__tag {
  font-family: var(--font-mono);
  font-size: var(--t-nano); letter-spacing: calc(0.12em * var(--track-open)); text-transform: uppercase;
  white-space: nowrap;
  padding: 0.2rem 0.45rem; border-radius: var(--r-pill);
  color: var(--c-2);
  border: 1px solid rgb(var(--c-2-rgb) / 0.35);
  background: rgb(var(--c-2-rgb) / 0.08);
  transition: background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

@media (hover: hover) { a.brand__tag:hover { background: rgb(var(--c-2-rgb) / 0.18); border-color: rgb(var(--c-2-rgb) / 0.6); } }

.nav__links { display: flex; align-items: center; flex-wrap: wrap;
              gap: var(--s-1); margin-inline: auto; }
.nav__link {
  position: relative;

  padding: 0.45rem 0.5rem; border-radius: var(--r-xs);
  font-size: var(--t-small); color: var(--fg-soft);
  transition: color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
@media (hover: hover) { .nav__link:hover { color: var(--fg); } }
.nav__link[aria-current="true"] { color: var(--fg); }
.nav__link[aria-current="true"]::after {
  content: ""; position: absolute; left: 0.75rem; right: 0.75rem; bottom: 0.15rem;
  height: 2px; border-radius: var(--r-nub); background: var(--grad);
}

.nav__actions {
  min-width: 0; display: flex; align-items: center; gap: var(--s-2); flex-shrink: 0; }

.langswitch {
  display: inline-flex; align-items: center;
  padding: 2px; border-radius: var(--r-pill);
  border: 1px solid var(--hairline); background: var(--surface);
}
@media (hover: hover) { .langswitch__btn:hover { color: var(--fg); } }
.langswitch__btn {
  padding: 0.3rem 0.7rem; border-radius: var(--r-pill);
  font-size: var(--t-micro); font-weight: 600; letter-spacing: calc(0.02em * var(--track-open));
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.langswitch__btn[aria-current="true"] {
  color: var(--on-grad);
  background: var(--grad);
}

.nav__ghost {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 0.45rem 0.7rem; border-radius: var(--r-sm);
  font-size: var(--t-small); color: var(--fg-soft);
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
@media (hover: hover) { .nav__ghost:hover { color: var(--fg); background: var(--surface); } }

.nav__burger {
  display: none;
  width: 40px; height: 40px; border-radius: var(--r-sm);
  align-items: center; justify-content: center;
  border: 1px solid var(--hairline); background: var(--surface);
}
.nav__burger span {
  display: block; width: 16px; height: 1.5px; background: var(--fg);
  position: relative; transition: transform var(--dur-fast) var(--ease-out);
}
.nav__burger span::before,
.nav__burger span::after {
  content: ""; position: absolute; left: 0; width: 16px; height: 1.5px; background: var(--fg);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) linear;
}
.nav__burger span::before { top: -5px; }
.nav__burger span::after  { top: 5px; }
.nav__burger[aria-expanded="true"] span { transform: rotate(45deg); }
.nav__burger[aria-expanded="true"] span::before { transform: translateY(5px) rotate(-90deg); }
.nav__burger[aria-expanded="true"] span::after  { opacity: 0; }

@media (max-width: 82.5rem) {

  .nav__link { padding-inline: 0.35rem; font-size: var(--t-xs); }
  .nav__inner { gap: 0.9rem; }
  .nav__ghost { padding-inline: 0.55rem; }
}

@media (max-width: 72.5rem) {
  .nav__burger { display: inline-flex; }
  .nav__links {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 0.75rem var(--gutter) 1.25rem;
    background: rgba(8, 7, 11, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--hairline);
    margin-inline: 0;

    display: none;
  }
  .nav__links[data-open="true"] { display: flex; }
  .nav__link { padding: 0.85rem 0.25rem; font-size: var(--t-base); }
  .nav__link[aria-current="true"]::after { left: 0.25rem; right: auto; width: 1.5rem; bottom: 0.45rem; }
  .nav__inner { justify-content: space-between; }
  .nav__ghost--signin { display: none; }
}
.nav__link--gh { display: none; }
@media (max-width: 72.5rem) and (min-width: 47.5001rem) {
  .nav__links[data-open="true"] .nav__link--gh { display: flex; }
}
@media (max-width: 35.0rem) {
  .brand__tag { display: none; }
}

@media (pointer: coarse) {
  .nav__link       { min-height: 44px; display: flex; align-items: center; }
  .nav__ghost      { min-height: 44px; }
  .langswitch__btn { min-height: 40px; display: inline-flex; align-items: center; }
  .footer__col a   { display: inline-block; padding-block: 0.35rem; }
}

.footer {
  padding-block: clamp(3.5rem, 7vw, 5.5rem) 3rem;
  border-top: 1px solid var(--hairline);
  background: var(--bg-sink);
}

.footer__grid {
  display: grid;

  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: clamp(1.75rem, 4vw, 3rem);
}
.footer__h {
  font-size: var(--t-micro); font-family: var(--font-mono);
  letter-spacing: calc(0.14em * var(--track-open)); text-transform: uppercase;
  color: var(--fg-faint); margin-bottom: var(--s-4); font-weight: 500;
}
.footer__col { min-width: 0; overflow-wrap: break-word; }
.footer__col ul { list-style: none; padding: 0; display: grid; gap: var(--s-2); }
.footer__col a { font-size: var(--t-small); color: var(--fg-soft); }
@media (hover: hover) { .footer__col a:hover { color: var(--fg); } }
.footer__blurb { font-size: var(--t-small); color: var(--fg-dim); max-width: 22rem; margin-top: 0.875rem; }
.footer__bottom {
  margin-top: clamp(2.5rem, 5vw, 4rem); padding-top: var(--s-5);
  border-top: 1px solid var(--hairline);
  display: flex; flex-wrap: wrap; gap: 1rem 1.5rem;
  align-items: center; justify-content: space-between;
  font-size: var(--t-micro); color: var(--fg-faint);
}
@media (max-width: 47.5rem) {
  .footer__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__col--brand { grid-column: 1 / -1; }
}

.nav__panelactions { display: none; }
@media (max-width: 47.5rem) {

  .nav__actions > [data-mobile-move] { display: none; }

  .nav__panelactions {
    display: grid; gap: var(--s-3);
    padding-top: var(--s-4); margin-top: var(--s-2);
    border-top: 1px solid var(--hairline);
  }
  .nav__panelactions .langswitch { justify-self: start; }
  .nav__panelactions .nav__ghost--signin { display: inline-flex; justify-self: start; }
  .nav__panelactions .btn--primary { justify-content: center; }

  .nav__inner { gap: var(--s-3); }
}

.nav__progress {
  position: absolute; inset: auto 0 0 0; height: 2px;
  background: transparent; pointer-events: none;
}
.nav__progress i {
  display: block; height: 100%; width: 100%;
  background: var(--grad);
  transform: scaleX(var(--read, 0)); transform-origin: left;

}

/* components.css */
.btn {
  -webkit-user-select: none;
  user-select: none;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  padding: 0.8rem 1.35rem;
  border-radius: var(--r-sm);
  font-size: var(--t-small); font-weight: 600; letter-spacing: calc(0.005em * var(--track-open));

  white-space: normal; text-wrap: balance; max-width: 100%;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
@media (hover: hover) { .btn:hover { transform: translateY(-1px); } }
.btn:active { transform: translateY(0); }

.btn--primary {
  color: var(--on-grad);
  background: var(--grad);
  box-shadow: 0 6px 24px -10px rgb(var(--c-2-rgb) / 0.85);
}
@media (hover: hover) { .btn--primary:hover { box-shadow: 0 10px 32px -10px rgb(var(--c-2-rgb) / 0.95); } }

.btn--ghost {
  color: var(--fg);
  border: 1px solid var(--hairline-2);
  background: var(--surface);
}
@media (hover: hover) { .btn--ghost:hover { background: var(--surface-2); border-color: var(--fg-faint); } }

.btn--lg { padding: 0.95rem 1.7rem; font-size: var(--t-md); }

.btn__arrow { transition: transform var(--dur-fast) var(--ease-out); }
@media (hover: hover) { .btn:hover .btn__arrow { transform: translateX(3px); } }

.chip {

  display: inline-flex; align-items: flex-start; gap: var(--s-2);
  max-width: 100%;
  padding: 0.45rem 0.95rem 0.45rem 0.6rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--hairline-2);
  background: rgba(255, 255, 255, 0.03);
  font-size: var(--t-small); color: var(--fg-soft);

  text-wrap: balance;
}

@media (max-width: 30.0rem) { .chip { font-size: var(--t-micro); } }
.chip__dot {
  width: 6px; height: 6px; border-radius: var(--r-round);
  background: var(--grad);
  flex-shrink: 0;
  margin-top: 0.52em;
}

.tag {
  display: inline-block;
  padding: 0.22rem 0.55rem; border-radius: var(--r-xs);
  font-family: var(--font-mono); font-size: var(--t-tiny); letter-spacing: calc(0.06em * var(--track-open));
  color: var(--fg-dim);
  border: 1px solid var(--hairline);
  background: var(--surface);
}

.card {
  position: relative;
  padding: clamp(1.4rem, 2.2vw, 1.9rem);
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background:
    linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.012));
  overflow: hidden;
  transition: border-color var(--dur) var(--ease-out),
              transform var(--dur) var(--ease-out);
}
@media (hover: hover) { .card:hover { border-color: var(--hairline-2); } }

.card--lit::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgb(var(--c-2-rgb) / .55), transparent);
  opacity: 0; transition: opacity var(--dur) var(--ease-out);
}
@media (hover: hover) { .card--lit:hover::before { opacity: 1; } }

.card__index {
  font-family: var(--font-mono); font-size: var(--t-micro);
  color: var(--fg-faint); letter-spacing: calc(0.1em * var(--track-open));
  margin-bottom: 0.9rem;
}
.card__title { font-size: var(--t-lg); margin-bottom: 0.55rem; }
.card__body { font-size: var(--t-small); color: var(--fg-dim); }

.grid { display: grid; gap: clamp(0.875rem, 1.6vw, 1.25rem); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 60.0rem) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 38.75rem) {
  .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

.stage {
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background:
    radial-gradient(120% 90% at 50% 0%, rgb(var(--c-2-rgb) / .07), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.008));
  overflow: hidden;
}
.stage__inner { padding: clamp(1.25rem, 3vw, 2.5rem); }

.stage--grid { isolation: isolate; }
.stage--grid::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(100% 70% at 50% 40%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(100% 70% at 50% 40%, #000 30%, transparent 78%);
}

.stage__caption {
  font-size: var(--t-small); color: var(--fg-dim);
  padding: 0 clamp(1.25rem, 3vw, 2.5rem) clamp(1.25rem, 3vw, 2rem);
  max-width: 46rem;
}

.legend { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; align-items: center; }
.legend__item {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-size: var(--t-micro); color: var(--fg-dim);
}
.legend__swatch { width: 9px; height: 9px; border-radius: var(--r-nub); flex-shrink: 0; }

.keyline {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.6vw, 2.1rem);
  font-weight: 500; line-height: 1.28; letter-spacing: calc(-0.02em * var(--track-tight));
  max-width: 34rem;
}

.rail { list-style: none; padding: 0; display: grid; gap: var(--s-1); }
.rail__item {

  display: grid; grid-template-columns: 2.25rem 1fr; gap: var(--s-4);
  width: 100%; text-align: left;
  padding: 0.95rem 0.75rem;
  border-radius: var(--r-md);
  transition: background var(--dur-fast) var(--ease-out);
  cursor: pointer;
}
@media (hover: hover) { .rail__item:hover { background: var(--surface); } }
.rail__item[aria-current="true"] { background: var(--surface-2); }
.rail__num {
  font-family: var(--font-mono); font-size: var(--t-micro);
  color: var(--fg-faint); padding-top: var(--s-1);
}
.rail__item[aria-current="true"] .rail__num { color: var(--brand-ink); }
.rail__text { display: block; }
.rail__title { display: block; font-weight: 600; font-size: var(--t-md); }
.rail__body { display: block; font-size: var(--t-small); color: var(--fg-dim); margin-top: 0.2rem; }

.cta {
  position: relative;
  isolation: isolate;
  padding-block: clamp(4.5rem, 9vw, 8rem);
  text-align: center;
  overflow: hidden;
}

.cta::before {
  content: ""; position: absolute; inset: -40% -10% auto -10%; height: 140%; z-index: -1;
  background: radial-gradient(50% 50% at 50% 40%, rgb(var(--c-2-rgb) / .15), transparent 70%);
  pointer-events: none;
}
.cta__actions {
  display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: center;
  margin-top: 2.25rem;
}

.has-langhint { scroll-padding-bottom: var(--hint-h); }
.has-langhint body { padding-bottom: var(--hint-h); }
.langhint {
  position: fixed; z-index: 90;
  left: 50%; bottom: 1.25rem;
  transform: translate(-50%, calc(100% + 2rem));
  display: flex; align-items: center; gap: 0.85rem;
  max-width: calc(100vw - 2rem);
  padding: 0.6rem 0.65rem 0.6rem 1.1rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--hairline-2);
  background: rgba(20, 17, 26, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 18px 44px -20px rgba(0, 0, 0, 0.95);
  font-size: var(--t-small);
  transition: transform 620ms var(--ease-out), opacity 620ms var(--ease-out);
  opacity: 0;
}
.langhint.is-in { transform: translate(-50%, 0); opacity: 1; }
.langhint__text { color: var(--fg-soft); }
.langhint__go {
  color: var(--c-2); font-weight: 600; white-space: nowrap;
  text-decoration: underline; text-underline-offset: 3px;
  text-decoration-color: rgb(var(--c-2-rgb) / 0.4);
}
@media (hover: hover) { .langhint__go:hover { text-decoration-color: currentColor; } }
.langhint__close {
  display: grid; place-items: center;
  width: 30px; height: 30px; border-radius: var(--r-round);
  color: var(--fg-dim); font-size: var(--t-base); line-height: 1;
  flex-shrink: 0;
}
@media (hover: hover) { .langhint__close:hover { color: var(--fg); background: var(--surface-2); } }

@media (max-width: 32.5rem) {
  .langhint { left: 1rem; right: 1rem; transform: translateY(calc(100% + 2rem)); max-width: none; }
  .langhint.is-in { transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .langhint { transition: none; opacity: 1; }
}

@media (forced-colors: active) {
  .btn, .langswitch__btn, .chip, .nav__ghost {
    border: 1px solid ButtonBorder;
    forced-color-adjust: none;
    color: ButtonText;
    background: ButtonFace;
  }
  .btn--primary, .langswitch__btn[aria-current="true"] {
    color: HighlightText;
    background: Highlight;
    border-color: Highlight;
  }
  .card, .scales__card, .open__col, .stage, .surface, .faq__item {
    border: 1px solid CanvasText;
  }
  .nav[data-stuck="true"] { background: Canvas; border-bottom-color: CanvasText; }
  .rail__item[aria-current="true"] { outline: 2px solid Highlight; }


  .switch, .cases__tabs { border-color: CanvasText; }
  .switch__btn { forced-color-adjust: none; color: ButtonText; background: ButtonFace; }
  .switch__btn[aria-pressed="true"] {
    color: HighlightText; background: Highlight;
  }

  .cases__tab[aria-selected="true"][aria-selected] {
    forced-color-adjust: none;
    color: HighlightText; background: Highlight;
  }

  .cases__tab[aria-selected="true"][aria-selected]::before,
  .nav__link[aria-current="true"]::after { background: Highlight; }
  .nav__link[aria-current="true"] { color: LinkText; text-decoration: underline; }

  .nav__progress i { background: Highlight; }
}

.switch {
  display: inline-flex; align-items: center;
  margin: clamp(1.25rem, 3vw, 2.5rem) clamp(1.25rem, 3vw, 2.5rem) 0;
  padding: 3px; border-radius: var(--r-pill);
  border: 1px solid var(--hairline);
  background: rgba(255, 255, 255, 0.04);
}
.switch__btn {
  padding: 0.5rem 1rem; border-radius: var(--r-pill);
  font-size: var(--t-small); font-weight: 600;
  color: var(--fg-dim);
  min-height: 34px;
  transition: color var(--dur-fast) var(--ease-out), background var(--dur) var(--ease-out);
}
@media (hover: hover) { .switch__btn:hover { color: var(--fg-soft); } }
.switch__btn[aria-pressed="true"] { color: var(--on-grad); background: var(--grad); }
@media (pointer: coarse) { .switch__btn { min-height: 44px; } }

@media (pointer: coarse) {
  .nav__burger { min-width: 44px; min-height: 44px; }
  .langswitch__btn { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .brand__home { min-height: 44px; display: inline-flex; align-items: center; }

  .footer__col a { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; }
  .langhint__go { min-height: 44px; display: inline-flex; align-items: center; }
  .langhint__close { min-width: 44px; min-height: 44px; }
}

.compare { display: grid; }
.compare__pane {
  grid-area: 1 / 1;

  min-width: 0;
  transition: opacity 420ms var(--ease-out), transform 420ms var(--ease-out);
}
.compare__pane.is-off {
  opacity: 0; transform: scale(0.985);
  pointer-events: none;
}
.compare__pane.is-on { opacity: 1; transform: none; }

.stage__captions { display: grid; }
.stage__captions > .stage__caption { grid-area: 1 / 1; }
.stage__caption.is-off { visibility: hidden; }

@media (prefers-reduced-motion: reduce) {
  .compare__pane { transition: none; }
  .compare__pane.is-off { transform: none; }
}

/* sections.css */
.shift__axis { margin-bottom: clamp(2rem, 4vw, 3rem); }
.shift__cards .card__title { font-size: var(--t-base); line-height: 1.35; }

.problem__losses { margin-top: clamp(2rem, 4vw, 3rem); }
.loss {
  padding-top: 1.1rem;
  border-top: 1px solid var(--hairline);
}
.loss__title {
  font-size: var(--t-base); font-weight: 600; margin-bottom: 0.45rem;
  font-family: var(--font-display); letter-spacing: calc(-0.015em * var(--track-tight));
}
.loss__body { font-size: var(--t-small); color: var(--fg-dim); }

.loop__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}
.loop__visual { min-width: 0; }
.loop__panel { min-width: 0; }
.loop__legend { margin-top: 1.25rem; padding-left: 0.75rem; }

@media (min-width: 53.76rem) and (max-height: 52rem) {
  .rail__item[aria-current="false"] .rail__body { display: none; }
}
.loop__keyline { margin-top: clamp(2.5rem, 5vw, 4rem); color: var(--fg-soft); }

@media (max-width: 53.75rem) {
  .loop__layout { grid-template-columns: minmax(0, 1fr); }

  .rail__item { cursor: default; }
  .rail__item[aria-current="true"] { background: none; }
}

.scales {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(0.875rem, 1.6vw, 1.25rem);
  position: relative;
}

.scales { isolation: isolate; }
.scales::before {
  content: ""; position: absolute; left: 0; right: 0; z-index: -1; height: 2px;
  top: calc(clamp(1.4rem, 2.2vw, 2rem) + 1rem);
  background: var(--grad); opacity: 0.35;
  transform: scaleX(0); transform-origin: left;
  transition: transform 1.4s var(--ease-out);
}
.scales.is-in::before { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
  .scales::before { transform: scaleX(1); transition: none; }
}

.scales__card {
  position: relative;
  padding: clamp(1.4rem, 2.2vw, 2rem);
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.012));
  transition: border-color var(--dur) var(--ease-out), background var(--dur) var(--ease-out);
}
@media (hover: hover) { .scales__card:hover { border-color: var(--hairline-2); } }
.scales__num {
  display: grid; place-items: center;
  width: 2rem; height: 2rem; border-radius: var(--r-round);
  font-family: var(--font-mono); font-size: var(--t-micro);
  color: var(--on-grad); background: var(--grad);
  margin-bottom: var(--s-5);
  position: relative; z-index: 1;
}
.scales__card h3 { font-size: var(--t-xl); margin-bottom: 0.4rem; }
.scales__sub {
  font-family: var(--font-mono); font-size: var(--t-tiny); letter-spacing: calc(0.06em * var(--track-open));
  color: var(--c-2); margin-bottom: 0.9rem;
}
.scales__body { font-size: var(--t-small); color: var(--fg-dim); }

@media (max-width: 53.75rem) {
  .scales { grid-template-columns: minmax(0, 1fr); }
  .scales::before { display: none; }
}

.arch {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
}
.arch__why { display: grid; gap: var(--s-5); padding-top: var(--s-2); }
.arch__whyitem h3 { font-size: var(--t-base); margin-bottom: 0.4rem; }
.arch__whyitem p { font-size: var(--t-small); color: var(--fg-dim); }
@media (max-width: 56.25rem) { .arch { grid-template-columns: minmax(0, 1fr); } }

.trust__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: center;
  margin-top: clamp(2.5rem, 5vw, 4rem);
}
.trust__h { font-size: var(--t-h3); margin-bottom: 0.9rem; }
.trust__b { color: var(--fg-dim); font-size: var(--t-small); max-width: 34rem; }
.trust__formula {
  margin-top: var(--s-5); padding: 0.85rem 1.1rem;
  border-radius: var(--r-sm); border: 1px solid var(--hairline);
  background: var(--surface);
  font-family: var(--font-mono); font-size: var(--t-xs);
  color: var(--fg-soft);
}
@media (max-width: 56.25rem) { .trust__split { grid-template-columns: minmax(0, 1fr); } }

.open__cols {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2rem);
}
.open__col {
  padding: clamp(1.4rem, 2.2vw, 1.9rem);
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.008));
}
.open__h { display: grid; gap: var(--s-1); margin-bottom: 1.35rem; }
.open__label {
  font-family: var(--font-display); font-size: var(--t-xl); font-weight: 600;
  letter-spacing: calc(-0.02em * var(--track-tight));
}
.open__col:nth-child(1) .open__label { color: var(--c-1); }
.open__col:nth-child(2) .open__label { color: var(--c-2); }
.open__col:nth-child(3) .open__label { color: var(--c-3); }
.open__sub {
  font-family: var(--font-mono); font-size: var(--t-tiny);
  letter-spacing: calc(0.08em * var(--track-open)); color: var(--fg-faint); text-transform: uppercase;
}
.open__list { list-style: none; padding: 0; display: grid; gap: 0.7rem; }
.open__list li {
  font-size: var(--t-small); color: var(--fg-soft);
  padding-left: 1.1rem; position: relative;
}
.open__list li::before {
  content: ""; position: absolute; left: 0; top: 0.6em;
  width: 5px; height: 5px; border-radius: var(--r-nub);
  background: currentColor; opacity: 0.35;
}
.open__keyline { margin-top: clamp(2.5rem, 5vw, 4rem); color: var(--fg-soft); max-width: 46rem; }
@media (max-width: 53.75rem) { .open__cols { grid-template-columns: minmax(0, 1fr); } }

.cta__lead { margin-inline: auto; }

.surface {
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline-2);
  background: linear-gradient(180deg, #131018, #0b0910);
  overflow: hidden;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.9);
}
.surface__chrome {
  display: flex; align-items: center; gap: var(--s-4);
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--hairline);
  background: rgba(255, 255, 255, 0.025);
  font-size: var(--t-micro);
}
.surface__dots { display: inline-flex; gap: 6px; }
.surface__dots i { width: 9px; height: 9px; border-radius: var(--r-round); background: rgba(255,255,255,.14); }
.surface__path { color: var(--fg-dim); font-family: var(--font-mono); }
.surface__live {
  margin-left: auto; display: inline-flex; align-items: center; gap: var(--s-2);
  color: var(--c-evidence);
}
.surface__pip {
  width: 6px; height: 6px; border-radius: var(--r-round); background: var(--c-evidence);
  box-shadow: 0 0 0 0 rgba(74, 222, 154, .6);
  animation: pip 2.4s var(--ease-io) infinite;
}
@keyframes pip {
  0%   { box-shadow: 0 0 0 0 rgba(74,222,154,.55); }
  70%  { box-shadow: 0 0 0 7px rgba(74,222,154,0); }
  100% { box-shadow: 0 0 0 0 rgba(74,222,154,0); }
}

.surface__body {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) 230px;
  min-height: 300px;
}
.surface__roster, .surface__evidence {
  padding: var(--s-4);
  font-size: var(--t-micro);
}
.surface__roster   { border-right: 1px solid var(--hairline); }
.surface__evidence { border-left: 1px solid var(--hairline); background: rgba(255,255,255,.015); }
.roster__head {
  font-family: var(--font-mono); letter-spacing: calc(0.1em * var(--track-open)); text-transform: uppercase;
  color: var(--fg-faint); margin-bottom: 0.9rem; font-size: var(--t-nano);
}
.roster__row { display: flex; gap: var(--s-2); align-items: center; padding: 0.42rem 0; }
.roster__av {
  width: 26px; height: 26px; border-radius: var(--r-xs); flex-shrink: 0;
  display: grid; place-items: center;
  font-size: var(--t-nano); font-weight: 700; letter-spacing: calc(0.04em * var(--track-open));
  color: #0b0910; background: var(--c);
}
.roster__meta { display: grid; min-width: 0; }
.roster__meta b { font-weight: 600; color: var(--fg-soft); font-size: var(--t-tiny); }
.roster__meta i {
  font-style: normal; color: var(--fg-faint); font-size: var(--t-nano);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.surface__canvas {
  position: relative; padding: 1.25rem;
  background-image:
    radial-gradient(rgba(255,255,255,.055) 1px, transparent 1px);
  background-size: 22px 22px;
}
.surface__links { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.note {
  position: absolute;
  display: grid; gap: var(--s-1);
  width: 172px; padding: 0.65rem 0.7rem;
  border-radius: var(--r-sm); border: 1px solid var(--hairline-2);
  background: #16121d;
  font-size: var(--t-tiny); color: var(--fg-soft); line-height: 1.45;
  box-shadow: 0 10px 22px -12px rgba(0,0,0,.9);
}
.note__tag {
  font-family: var(--font-mono); font-size: var(--t-nano);
  letter-spacing: calc(0.08em * var(--track-open)); text-transform: uppercase;
}
.note--a { left: 6%;  top: 14%; }
.note--a .note__tag { color: var(--c-2); }
.note--b { left: 52%; top: 40%; }
.note--b .note__tag { color: var(--c-1); }
.note--c { left: 14%; top: 66%; }
.note--c .note__tag { color: var(--c-ai); }

.trail { list-style: none; padding: 0; display: grid; gap: 0.7rem; }
.trail__item {
  display: grid; gap: 0.15rem;
  padding-left: 1rem; position: relative;
}
.trail__item::before {
  content: ""; position: absolute; left: 0; top: 0.35em;
  width: 7px; height: 7px; border-radius: var(--r-round);
  background: var(--fg-faint);
}
.trail__item--ok::before   { background: var(--c-evidence); }
.trail__item--warn::before { background: var(--c-human); }
.trail__item b { font-weight: 600; color: var(--fg-soft); font-size: var(--t-tiny); }
.trail__item i { font-style: normal; color: var(--fg-faint); font-size: var(--t-nano); }

.surface__note {
  margin-top: 1.25rem; font-size: var(--t-small);
  color: var(--fg-dim); max-width: 46rem;
}

@media (max-width: 56.25rem) {

  .surface__body { grid-template-columns: minmax(0, 1fr); }
  .surface__roster { display: none; }
  .surface__evidence { border-left: 0; border-top: 1px solid var(--hairline); }

  .surface__canvas { min-height: 330px; }
  .note { width: 148px; font-size: var(--t-nano); }
  .note--a { left: 4%; top: 5%; }
  .note--b { left: auto; right: 4%; top: 37%; }
  .note--c { left: 4%; top: 69%; }
}

.unit__steps {
  list-style: none; padding: 0; margin-bottom: clamp(2rem, 4vw, 3rem);
  display: grid; grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--s-2);
  counter-reset: unit;
}
.unit__step {
  position: relative;
  display: grid; gap: var(--s-1); align-content: start;
  padding: 1rem 0.9rem;
  border-radius: var(--r-md);
  border: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
}

.unit__step:not(:last-child)::after {
  content: ""; position: absolute; right: -0.5rem; top: 50%;
  width: 0.5rem; height: 1px; background: var(--hairline-2);
}
.unit__n {
  font-family: var(--font-mono); font-size: var(--t-nano);
  color: var(--c-2); letter-spacing: calc(0.1em * var(--track-open));
}
.unit__step b { font-size: var(--t-small); font-weight: 600; }
.unit__step i { font-style: normal; font-size: var(--t-micro); color: var(--fg-dim); }

.prop {
  display: grid; gap: var(--s-2); align-content: start;
  padding-top: var(--s-4); border-top: 2px solid; border-image: var(--grad) 1;
}
.prop b { font-family: var(--font-display); font-size: var(--t-base); }
.prop span { font-size: var(--t-small); color: var(--fg-dim); }

@media (max-width: 56.25rem) {
  .unit__steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .unit__step:not(:last-child)::after { display: none; }
}

@media (max-width: 30.0rem) { .unit__step { padding: 0.75rem 0.7rem; } }

.faq { display: grid; gap: 0; max-width: 46rem; }
.faq__item { border-bottom: 1px solid var(--hairline); }
.faq__item:first-child { border-top: 1px solid var(--hairline); }
.faq__item summary {
  display: flex; align-items: center; gap: var(--s-4);
  padding: 1.35rem 0.25rem;
  cursor: pointer; list-style: none;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem); font-weight: 500;
  letter-spacing: calc(-0.015em * var(--track-tight));
  transition: color var(--dur-fast) var(--ease-out);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: ""; margin-left: auto; flex-shrink: 0;
  width: 11px; height: 11px;
  border-right: 1.5px solid var(--fg-dim); border-bottom: 1.5px solid var(--fg-dim);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--dur) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.faq__item[open] summary::after {
  transform: rotate(-135deg) translate(-2px, -2px);
  border-color: var(--c-2);
}
@media (hover: hover) { .faq__item summary:hover { color: var(--c-2); } }
.faq__item p {
  padding: 0 2.25rem 1.5rem 0.25rem;
  color: var(--fg-dim); font-size: var(--t-small);
}

.faq__item p:not(:last-child) { padding-bottom: 0.75rem; }

.hz {
  list-style: none; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2rem);
  position: relative;
}
.hz__item {
  padding-top: 1.75rem;
  border-top: 1px solid var(--hairline);
  position: relative;
}
.hz__item::before {
  content: ""; position: absolute; left: 0; top: -1px;
  width: 2.5rem; height: 2px; background: var(--hairline-2);
}
.hz__item--now::before { background: var(--grad); width: 4.5rem; }
.hz__when {
  display: inline-block;
  font-family: var(--font-mono); font-size: var(--t-nano);
  letter-spacing: calc(0.14em * var(--track-open)); text-transform: uppercase;
  color: var(--fg-faint); margin-bottom: 0.9rem;
}
.hz__item--now .hz__when { color: var(--c-2); }
.hz__item h3 { font-size: var(--t-lg); margin-bottom: var(--s-2); }
.hz__item p { font-size: var(--t-small); color: var(--fg-dim); }
@media (max-width: 51.25rem) { .hz { grid-template-columns: minmax(0, 1fr); } }

.caps {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.cap {
  padding: clamp(1.25rem, 2vw, 1.75rem);
  background: var(--bg);
  transition: background var(--dur) var(--ease-out);
}
@media (hover: hover) { .cap:hover { background: #0d0b12; } }
.cap h3 {
  font-size: var(--t-md); margin-bottom: var(--s-2);
  display: flex; align-items: baseline; gap: var(--s-2);
}
.cap h3::before {
  content: ""; width: 5px; height: 5px; border-radius: var(--r-nub);
  background: var(--grad); flex-shrink: 0;
}
.cap p { font-size: var(--t-small); color: var(--fg-dim); }

@media (max-width: 62.5rem) { .caps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 35.0rem)  { .caps { grid-template-columns: minmax(0, 1fr); } }

.proof { position: relative; isolation: isolate; }
.proof::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(70% 60% at 22% 40%, rgb(var(--c-3-rgb) / 0.09), transparent 70%);
}
.proof__inner {
  display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.proof__copy h2 { font-size: clamp(1.75rem, 3.1vw, 2.6rem); }
.proof__copy .lead { margin-bottom: var(--s-6); }
.proof__rules { list-style: none; padding: 0; display: grid; gap: 1px; background: var(--hairline); }
.proof__rules li {
  display: grid; gap: 0.35rem;
  padding: 1.15rem 1.25rem;
  background: var(--bg);
  position: relative;
}
.proof__rules li::before {
  content: ""; position: absolute; left: 0; top: 1.35rem; bottom: 1.35rem; width: 2px;
  background: var(--grad); opacity: 0.55;
}
.proof__rules b {
  font-family: var(--font-display); font-size: var(--t-md); font-weight: 600;
  letter-spacing: calc(-0.015em * var(--track-tight));
}
.proof__rules span { font-size: var(--t-small); color: var(--fg-dim); }

@media (max-width: 56.25rem) { .proof__inner { grid-template-columns: minmax(0, 1fr); } }

.arch__detail {
  padding: 1.1rem 1.25rem;
  border-radius: var(--r-md);
  border: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  margin-bottom: var(--s-2);

  min-height: 7.5rem;
  display: grid; align-content: center;
}
.arch__detail p { font-size: var(--t-small); color: var(--fg-soft); }
@media (max-width: 56.25rem) { .arch__detail { min-height: 0; } }

.doc { padding-block: calc(var(--nav-h) + var(--s-6)) calc(var(--s-6) * 2); }
.doc h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: var(--s-4); }
.doc .lead { margin-bottom: var(--s-6); }
.doc h2 {
  font-size: var(--t-lg);
  margin-top: var(--s-6); margin-bottom: var(--s-2);
  padding-top: var(--s-4);
  border-top: 1px solid var(--hairline);
}
.doc p { color: var(--fg-dim); }
.doc a:not(.nav__ghost):not(.langswitch__btn):not(.brand) {
  color: var(--c-2);
  text-decoration: underline; text-underline-offset: 3px;
  text-decoration-color: rgb(var(--c-2-rgb) / 0.4);
}
.doc code {
  font-family: var(--font-mono); font-size: var(--t-inline-code);
  padding: 0.1em 0.4em; border-radius: var(--r-xs);
  background: var(--surface); border: 1px solid var(--hairline);
  word-break: break-all;
}
.doc__meta {
  margin-top: var(--s-6); padding-top: var(--s-4);
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono); font-size: var(--t-micro);
  color: var(--fg-faint);
}

.cases {
  display: grid;
  grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.008));
  overflow: hidden;
}
.cases__tabs {
  display: flex; flex-direction: column;
  padding: var(--s-4);
  border-right: 1px solid var(--hairline);
  background: rgba(255, 255, 255, 0.02);
}
.cases__tab {
  text-align: left;
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-sm);
  font-size: var(--t-md); font-weight: 500;
  color: var(--fg-dim);
  min-height: 42px;
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
@media (hover: hover) { .cases__tab:hover { color: var(--fg-soft); background: var(--surface); } }
.cases__tab[aria-selected="true"] {
  color: var(--fg); background: var(--surface-2); font-weight: 600;
  position: relative;
}
.cases__tab[aria-selected="true"]::before {
  content: ""; position: absolute; left: 0; top: 0.6rem; bottom: 0.6rem;
  width: 2px; border-radius: var(--r-nub); background: var(--grad);
}
@media (pointer: coarse) { .cases__tab { min-height: 48px; } }

.cases__panels { padding: clamp(1.25rem, 2.5vw, 2rem) clamp(1.25rem, 2.5vw, 2rem) clamp(1.25rem, 2.5vw, 2rem) 0; }
.case:focus-visible { outline-offset: 6px; }
.case__work {
  font-size: clamp(1.125rem, 1.9vw, 1.5rem);
  margin-bottom: var(--s-5);
  max-width: 34rem;
}
.case__grid { display: grid; gap: var(--s-4); margin: 0; }
.case__grid > div {
  display: grid; gap: var(--s-1);
  padding-top: var(--s-3);
  border-top: 1px solid var(--hairline);
}
.case__grid dt {
  font-family: var(--font-mono); font-size: var(--t-nano);
  letter-spacing: calc(0.12em * var(--track-open)); text-transform: uppercase;
  color: var(--c-2);
}

.case__grid dd { margin: 0; font-size: var(--t-small); color: var(--fg-dim); max-width: 44rem; }

.cases__note {
  margin-top: var(--s-4);
  font-size: var(--t-small); color: var(--fg-faint);
  max-width: 46rem;
}

@media (max-width: 53.75rem) {
  .cases { grid-template-columns: minmax(0, 1fr); }

  .cases__tabs {
    display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s-1);
    border-right: 0; border-bottom: 1px solid var(--hairline);
  }
  .cases__tab { text-align: center; }
  .cases__tab[aria-selected="true"]::before { inset: auto 0.6rem 0 0.6rem; width: auto; height: 2px; top: auto; }
  .cases__panels { padding: clamp(1.25rem, 2.5vw, 2rem); }
}

.exit {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: clamp(1.75rem, 3vw, 2.5rem);
  border-top: 1px solid var(--hairline);
}
.exit__title {
  font-size: var(--t-h3); letter-spacing: calc(-0.015em * var(--track-tight));
  margin-bottom: var(--s-3);
}
.exit__lead { color: var(--fg-dim); max-width: 44rem; margin-bottom: var(--s-6); }
.exit__list {
  list-style: none; padding: 0;
  display: grid; gap: 1px; background: var(--hairline);
  border-radius: var(--r-sm); overflow: hidden;
}
.exit__item {
  display: grid; gap: 0.4rem;
  padding: 1.25rem clamp(1.1rem, 2vw, 1.6rem);
  background: var(--bg);
}
.exit__item b {
  font-family: var(--font-display); font-size: var(--t-md); font-weight: 600;
  letter-spacing: calc(-0.015em * var(--track-tight));
}
.exit__item > span { font-size: var(--t-small); color: var(--fg-dim); }
.exit__state {
  font-family: var(--font-mono); font-size: var(--t-micro);
  color: var(--fg-faint) !important;
  padding-left: 0.85rem; position: relative;
}
.exit__state::before {
  content: ""; position: absolute; left: 0; top: 0.5em;
  width: 4px; height: 4px; border-radius: var(--r-nub);
  background: var(--c-2); opacity: 0.6;
}
@media (min-width: 53.75rem) {
  .exit__list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.exit__state[data-state="live"]::before { background: var(--c-1); opacity: 1; }
.exit__state[data-state="planned"]::before {
  background: none;
  box-shadow: inset 0 0 0 1px var(--fg-faint);
  opacity: 0.9;
}

.reader {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: clamp(1.75rem, 3vw, 2.5rem);
  border-top: 1px solid var(--hairline);
}
.reader__title { font-size: var(--t-h3); letter-spacing: calc(-0.015em * var(--track-tight)); margin-bottom: var(--s-3); }
.reader__lead { color: var(--fg-dim); max-width: 46rem; margin-bottom: var(--s-6); }

.proof__note {
  margin-top: var(--s-4);
  font-size: var(--t-small); color: var(--fg-dim);
  max-width: 38rem;
}

.notyet {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: clamp(1.75rem, 3vw, 2.5rem);
  border-top: 1px solid var(--hairline);
}
.notyet__title { font-size: var(--t-h3); letter-spacing: calc(-0.015em * var(--track-tight)); margin-bottom: var(--s-3); }
.notyet__lead { color: var(--fg-dim); max-width: 46rem; margin-bottom: var(--s-5); }
.notyet__list { list-style: none; padding: 0; display: grid; gap: var(--s-4); max-width: 52rem; }
.notyet__list li {
  font-size: var(--t-small); color: var(--fg-dim);
  padding-left: 1.1rem; position: relative;
}
.notyet__list li::before {
  content: ""; position: absolute; left: 0; top: 0.62em;
  width: 7px; height: 1px; background: var(--fg-faint);
}
.notyet__list b { color: var(--fg-soft); font-weight: 600; }

.doors {
  list-style: none; padding: 0;


  width: 100%;
  margin: clamp(2rem, 4vw, 3rem) auto clamp(2rem, 4vw, 3rem);
  display: grid; gap: 1px; background: var(--hairline);
  border-radius: var(--r-sm); overflow: hidden;
  text-align: left;
}
.door {
  display: grid; gap: 0.4rem;

  align-content: start;
  padding: 1.35rem clamp(1.1rem, 2vw, 1.6rem);

  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
}
.door__who {
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: calc(0.08em * var(--track-open)); text-transform: uppercase; color: var(--fg-faint);
}
.door__step {
  font-family: var(--font-display); font-size: var(--t-md); font-weight: 600;
  letter-spacing: calc(-0.015em * var(--track-tight)); color: var(--fg);
}
.door__then { font-size: var(--t-small); color: var(--fg-dim); }
.door__then em { font-style: normal; color: var(--fg-soft); }
@media (min-width: 53.75rem) {
  .doors { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.cta__head { max-width: var(--measure-text); margin-inline: auto; }

.demo__label { margin-bottom: var(--s-4); }

.demo [hidden] { display: none; }
.demo__note {
  max-width: 46rem;
  margin: calc(var(--s-5) * -0.5) 0 var(--s-5);
  padding-left: var(--s-3);
  border-left: 2px solid var(--hairline-2);
  color: var(--fg-dim); font-size: var(--t-small);
}
.demo {
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background: var(--surface);
  overflow: hidden;
}
.demo__fallback { margin: 0; padding: var(--s-5) var(--s-5) var(--s-5) 2.6rem; color: var(--fg-soft); display: grid; gap: var(--s-2); }
.demo__noscript { padding: 0 var(--s-5) var(--s-5); color: var(--fg-dim); font-size: var(--t-small); }

.js .demo__noscript { display: none; }

.demo__tabs {
  position: relative;
  display: flex; flex-wrap: wrap; gap: var(--s-2);
  padding: var(--s-3);
  border-bottom: 1px solid var(--hairline);
  background: rgba(255, 255, 255, 0.02);
}
.demo__tab {
  display: grid; align-content: start; gap: 0.2rem;
  min-height: 44px;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  text-align: left;
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
@media (hover: hover) { .demo__tab:hover { color: var(--fg-soft); background: var(--surface); } }

@media (max-width: 48rem) {
  .demo__tabs {
    flex-wrap: nowrap; overflow-x: auto;
    scroll-snap-type: x proximity; scroll-padding-inline: var(--s-3);
    scrollbar-width: none;
  }
  .demo__tabs::-webkit-scrollbar { display: none; }
  .demo__tab { flex: none; width: 13.5rem; scroll-snap-align: start; }
}
.demo__tabwho { font-size: var(--t-micro); font-weight: 600; color: var(--c-1); }
.demo__tabask { font-size: var(--t-small); line-height: 1.35; color: var(--fg-soft); }
.demo__tab[aria-selected="true"] { background: var(--surface-2); border-color: var(--c-2); box-shadow: inset 0 -2px 0 var(--c-2); }
.demo__tab[aria-selected="true"] .demo__tabask { color: var(--fg); }

@media (min-width: 64rem) { .demo__tabs { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); } }
@media (min-width: 48.01rem) and (max-width: 63.99rem) { .demo__tabs { display: grid; grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr)); } }

.demo__panel {
  display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  outline: none;
}
.demo__head {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: var(--s-5);
  padding: var(--s-5);
  border-bottom: 1px solid var(--hairline);
}
.demo__head .demo__situation, .demo__head .demo__task { margin-bottom: 0; }
.demo__go { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2) var(--s-4); margin-top: var(--s-4); }
.demo__go .demo__status { margin: 0; }
.demo__brief, .demo__work { padding: var(--s-5); min-width: 0; }
.demo__brief { border-right: 1px solid var(--hairline); background: rgba(255, 255, 255, 0.015); }
.demo__work > :first-child { margin-top: 0; }
.demo__idle {
  padding: var(--s-5); border: 1px dashed var(--hairline-2); border-radius: var(--r-md);
  color: var(--fg-dim); font-size: var(--t-small); text-align: center;
}
@media (max-width: 56.25rem) {
  .demo__panel, .demo__head { grid-template-columns: minmax(0, 1fr); }
  .demo__brief { border-right: 0; border-bottom: 1px solid var(--hairline); }
}
.demo__kicker {
  font-family: var(--font-mono); font-size: var(--t-micro);
  text-transform: uppercase; letter-spacing: calc(0.08em * var(--track-open));
  color: var(--fg-faint);
  margin-bottom: var(--s-2);
}
.demo__situation {
  margin-bottom: var(--s-5);
  padding: var(--s-3) var(--s-4);
  border-left: 2px solid var(--c-human);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(255, 178, 61, 0.06);
  color: var(--fg-soft); font-size: var(--t-md); line-height: 1.55;
}
.demo__situation strong { color: var(--fg); font-weight: 600; }

.demo__research {
  margin: var(--s-4) 0 0;
  padding: var(--s-3) var(--s-4);
  border-left: 2px solid var(--c-evidence);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(74, 222, 154, 0.06);
}
.demo__rquote { margin: 0; color: var(--fg); font-size: var(--t-md); line-height: 1.5; }
.demo__rgloss { margin-top: var(--s-1); color: var(--fg-soft); font-size: var(--t-small); }
.demo__rsource { margin-top: var(--s-2); color: var(--fg-dim); font-size: var(--t-micro); }

.demo__rsource a {
  display: inline-flex; align-items: center; min-height: 44px;
  color: var(--fg-soft); text-decoration: underline; text-underline-offset: 2px;
}
.demo__rabout { display: block; margin-top: var(--s-1); color: var(--fg-dim); }
.demo__task { font-size: var(--t-lg); line-height: 1.45; color: var(--fg); margin-bottom: var(--s-5); }

.demo__sources { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--s-2); }
.demo__src {
  display: flex; gap: var(--s-3); align-items: flex-start;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.demo__src.is-used { border-color: var(--c-ai); background: rgba(122, 184, 255, 0.07); }
.demo__srcbody { display: grid; gap: 0.15rem; min-width: 0; }
.demo__who { font-size: var(--t-micro); color: var(--fg-dim); }

.demo__src.is-used .demo__who { color: var(--fg-soft); }
.demo__quote { font-size: var(--t-small); color: var(--fg-soft); }
.demo__srctag, .demo__cite {
  flex-shrink: 0;
  font-family: var(--font-mono); font-size: var(--t-micro); font-weight: 600;
  padding: 0.1rem 0.4rem;
  border-radius: var(--r-xs);
  color: var(--c-ai);
  background: rgba(122, 184, 255, 0.1);
}
.demo__cite--none { color: var(--c-fail); background: rgba(255, 93, 93, 0.1); }

.demo__run { color: var(--fg); border: 1px solid var(--c-2); background: rgb(var(--c-2-rgb) / 0.12); }
@media (hover: hover) { .demo__run:hover { background: rgb(var(--c-2-rgb) / 0.2); } }
.demo__run:disabled { opacity: 0.6; cursor: progress; }
.demo__status { min-height: 1.5em; margin: var(--s-3) 0; color: var(--fg-dim); font-size: var(--t-small); }

.demo__log { list-style: none; padding: 0; margin: 0 0 var(--s-5); display: grid; gap: var(--s-2); }
.demo__step {
  display: grid; gap: 0.2rem;
  padding: 0.6rem 0.8rem;
  border-left: 2px solid var(--hairline-2);
  animation: demo-in var(--dur-fast) var(--ease-out) both;
}
.demo__step.is-active { border-left-color: var(--c-ai); background: rgba(122, 184, 255, 0.05); }
.demo__stepn { font-family: var(--font-mono); font-size: var(--t-micro); color: var(--fg-faint); }
.demo__agent { font-weight: 600; color: var(--fg); font-size: var(--t-md); }
.demo__did { color: var(--fg-soft); font-size: var(--t-small); }
.demo__uses { display: flex; flex-wrap: wrap; gap: var(--s-1); margin-top: 0.2rem; }
@keyframes demo-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .demo__step { animation: none; } }

.demo__claims { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--s-3); }
.demo__claim {
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--c-evidence);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.02);
}
.demo__claim.is-withdrawn { border-left-color: var(--c-fail); }
.demo__claimtext { color: var(--fg); font-size: var(--t-md); }
.demo__claim.is-withdrawn .demo__claimtext { color: var(--fg-dim); }
.demo__claimmeta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2); margin-top: var(--s-2); }
.demo__doubt {
  min-height: 44px; min-width: 44px;
  margin-left: auto;
  padding: 0 0.8rem;
  border: 1px solid var(--hairline-2);
  border-radius: var(--r-sm);
  font-size: var(--t-xs); font-weight: 500;
  color: var(--fg-soft);
}
@media (hover: hover) { .demo__doubt:hover { color: var(--fg); border-color: var(--fg-faint); } }
.demo__doubt[aria-expanded="true"] { color: var(--fg); background: var(--surface-2); }
.demo__check { margin-top: var(--s-3); padding-top: var(--s-3); border-top: 1px dashed var(--hairline-2); display: grid; gap: var(--s-2); }

.demo__verdict { display: grid; gap: 0.2rem; font-size: var(--t-small); color: var(--fg-soft); }
.demo__verdict strong { font-weight: 600; color: var(--c-evidence); }
.demo__claim.is-withdrawn .demo__verdict strong { color: var(--c-fail); }
.demo__claim.is-withdrawn .demo__verdict span { color: var(--fg); }

.demo__decide { display: grid; gap: var(--s-2); padding-top: var(--s-2); border-top: 1px dashed var(--hairline-2); }
.demo__decideq { font-size: var(--t-small); color: var(--fg-soft); }
.demo__decidebtns { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.demo__decidebtn {
  min-height: 44px; padding: 0 0.9rem;
  border: 1px solid var(--hairline-2); border-radius: var(--r-sm);
  font-size: var(--t-xs); font-weight: 500; color: var(--fg-soft);
}
@media (hover: hover) { .demo__decidebtn:hover { color: var(--fg); border-color: var(--fg-faint); } }
.demo__decidebtn[aria-pressed="true"] { color: var(--fg); background: var(--surface-2); border-color: var(--fg-soft); }
.demo__decided { font-size: var(--t-small); color: var(--fg); }
.demo__decided:empty { display: none; }
.demo__claim.is-overruled { border-left-color: var(--c-human); }
.demo__claimtext s.is-lifted { text-decoration: none; color: var(--fg); }
.demo__copied { margin-top: var(--s-3); font-size: var(--t-small); color: var(--fg-soft); display: grid; gap: var(--s-2); }
.demo__copied:empty { display: none; }
.demo__notetext {
  width: 100%; padding: var(--s-2);
  border: 1px solid var(--hairline-2); border-radius: var(--r-sm);
  background: var(--bg-sink); color: var(--fg-soft);
  font-family: var(--font-mono); font-size: var(--t-micro);
}
.demo__cited { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--s-2); }
.demo__cited li { display: flex; gap: var(--s-2); align-items: flex-start; font-size: var(--t-small); color: var(--fg-soft); }

.demo__next {
  margin-top: var(--s-5); padding: var(--s-4) var(--s-5);
  border-radius: var(--r-md);
  background: linear-gradient(100deg, rgb(var(--c-1-rgb) / 0.1), rgb(var(--c-3-rgb) / 0.1));
  border: 1px solid rgb(var(--c-2-rgb) / 0.35);
}
.demo__headline {
  font-family: var(--font-display); font-size: var(--t-xl); font-weight: 600; line-height: 1.35;
  color: var(--fg);
  margin-bottom: var(--s-5);
}
.demo__so { color: var(--fg); font-size: var(--t-lg); line-height: 1.45; margin-bottom: var(--s-3); }
.demo__yours { color: var(--fg); font-weight: 600; font-size: var(--t-md); margin-bottom: var(--s-1); }
.demo__nextline { color: var(--fg-dim); font-size: var(--t-small); margin-bottom: var(--s-3); }
.demo__nextactions { display: flex; flex-wrap: wrap; gap: var(--s-3); }

/* motion.css */
[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}
[data-reveal="left"]  { transform: translate3d(-24px, 0, 0); }
[data-reveal="right"] { transform: translate3d(24px, 0, 0); }

@media (max-width: 56.25rem) {
  [data-reveal="left"], [data-reveal="right"] { transform: translate3d(0, 22px, 0); }
}
[data-reveal="scale"] { transform: scale(0.965); }
[data-reveal].is-in   { opacity: 1; transform: none; }

html:not(.js) [data-reveal],
html:not(.js) [data-stagger] > * {
  animation: reveal-failsafe 1ms linear 1.2s forwards;
}
@keyframes reveal-failsafe { to { opacity: 1; transform: none; } }

[data-stagger] > * {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 70ms);
}
[data-stagger].is-in > * { opacity: 1; transform: none; }

.hero {
  position: relative;
  min-height: min(100svh, 940px);
  display: grid; align-items: center;
  padding-block: calc(var(--nav-h) + 4rem) clamp(3rem, 8vh, 6rem);
  overflow: hidden;
  isolation: isolate;
}

.hero__aurora {
  position: absolute; inset: -12%; z-index: -2; pointer-events: none;
  background: url("../img/aurora.webp") center / cover no-repeat;
  opacity: 0.85;
  animation: drift 26s var(--ease-io) infinite alternate;
  will-change: transform;
}
@keyframes drift {
  from { transform: translate3d(-1.5%, -1%, 0) scale(1.04); }
  to   { transform: translate3d(1.5%, 2%, 0)  scale(1.12); }
}

.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(90% 65% at 50% 45%, transparent 20%, rgba(8,7,11,.72) 78%),
    linear-gradient(180deg, rgba(8,7,11,.5), transparent 28%, rgba(8,7,11,.9));
}

.hero__inner { display: grid; grid-template-columns: minmax(0, 1fr);
               justify-items: center; text-align: center; gap: var(--s-5); }

.hero__title { max-width: min(18ch, 100%); }
.hero__sub {
  font-size: var(--t-lead); color: var(--fg-soft);
  max-width: 42rem; margin-top: var(--s-1);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: center; margin-top: var(--s-3); }

.hero__title .word {
  display: inline-block;
  opacity: 0;
  transform: translate3d(0, 0.5em, 0);
  animation: word-rise 900ms var(--ease-out) forwards;
  animation-delay: calc(140ms + var(--i) * 65ms);
}
@keyframes word-rise { to { opacity: 1; transform: none; } }

.hero__chain { width: 100%; max-width: 60rem; margin-top: clamp(2rem, 5vh, 3.5rem); }

.scroll-cue {
  position: absolute; left: 50%; bottom: 1.75rem;
  transform: translateX(-50%);
  display: grid; justify-items: center; gap: var(--s-2);
  font-family: var(--font-mono); font-size: var(--t-nano);
  letter-spacing: calc(0.18em * var(--track-open)); text-transform: uppercase; color: var(--fg-faint);
}
.scroll-cue__line {
  width: 1px; height: 30px;
  background: linear-gradient(180deg, var(--fg-faint), transparent);
  animation: cue 2.2s var(--ease-io) infinite;
  transform-origin: top;
}
@keyframes cue {
  0%, 100% { transform: scaleY(0.35); opacity: 0.35; }
  50%      { transform: scaleY(1);    opacity: 1; }
}

.scene { position: relative; }
.scene__track { height: var(--scene-track, 320vh); }
.scene__pin {
  position: sticky; top: var(--nav-h);
  height: calc(100svh - var(--nav-h));
  display: grid; align-content: center;
}

@media (max-width: 53.75rem) {

  .scene__track { height: auto; }
  .scene__pin { position: static; height: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }


  [data-reveal], [data-stagger] > * { opacity: 1 !important; transform: none !important; }
  .hero__title .word { opacity: 1; transform: none; }
  .hero__aurora { animation: none; opacity: 0.55; }


  .scene__track { height: auto; }
  .scene__pin { position: static; height: auto; }
}

.is-offscreen .hero__aurora { animation-play-state: paused; }

.is-offscreen .d-break__spark,
.is-offscreen .d-chain__pulse,
.is-offscreen .surface__pip {
  animation-play-state: paused;
}

.surface .trail__item {
  opacity: 0;
  transform: translate3d(0, 6px, 0);
  transition: opacity 520ms var(--ease-out), transform 520ms var(--ease-out);
}
.surface .trail__item:nth-child(1) { transition-delay: 320ms; }
.surface .trail__item:nth-child(2) { transition-delay: 520ms; }
.surface .trail__item:nth-child(3) { transition-delay: 720ms; }
.surface .trail__item:nth-child(4) { transition-delay: 920ms; }
.surface.is-in .trail__item { opacity: 1; transform: none; }

.surface .note {
  opacity: 0;
  transform: translate3d(0, 10px, 0) scale(0.97);
  transition: opacity 620ms var(--ease-out), transform 620ms var(--ease-out);
}
.surface .note--a { transition-delay: 120ms; }
.surface .note--b { transition-delay: 280ms; }
.surface .note--c { transition-delay: 440ms; }
.surface.is-in .note { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .surface .trail__item, .surface .note { opacity: 1 !important; transform: none !important; }
}

/* diagrams.css */
.d-label {
  font-family: var(--font-body);
  font-size: calc(13px * var(--dscale, 1));
  fill: var(--fg-soft);
  letter-spacing: calc(0.01em * var(--track-open));
}
.d-label--lg    { font-size: calc(15px * var(--dscale, 1)); font-family: var(--font-display); font-weight: 600; fill: var(--fg); }
.d-label--xs    { font-size: calc(11.5px * var(--dscale, 1)); }
.d-label--dim   { fill: var(--fg-dim); }
.d-label--faint { fill: var(--fg-faint); font-family: var(--font-mono); font-size: calc(11px * var(--dscale, 1)); }
.d-label--fail  { fill: var(--c-fail); }

.d-label--on    { fill: var(--on-grad); font-weight: 600; }

.d-chain { width: 100%; height: auto; overflow: visible; }
.d-chain__node {
  opacity: 0;
  animation: d-pop 700ms var(--ease-out) forwards;
  animation-delay: calc(600ms + var(--i) * 110ms);
}
@keyframes d-pop { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.d-chain__core { filter: drop-shadow(0 0 6px rgb(var(--c-2-rgb) / .6)); }
.d-chain__pulse { filter: drop-shadow(0 0 7px rgba(255,255,255,.85)); opacity: .9; }

.d-axis { width: 100%; height: 92px; overflow: visible; }
.d-axis__fill {
  stroke-dasharray: 1000; stroke-dashoffset: 1000;
  transition: stroke-dashoffset 1.8s var(--ease-out);
}
.is-in .d-axis__fill, [data-reveal].is-in .d-axis__fill { stroke-dashoffset: 0; }

.d-break { width: 100%; height: auto; overflow: visible; }
.d-break__spark {
  animation: d-evaporate 2.6s var(--ease-io) infinite;
  animation-delay: calc(var(--i) * 420ms + var(--p) * 260ms);
  opacity: 0;
}
@keyframes d-evaporate {
  0%   { opacity: 0;   transform: translateY(0)    scale(1); }
  22%  { opacity: .85; }
  100% { opacity: 0;   transform: translateY(-26px) scale(.4); }
}

.d-loop { width: 100%; max-width: 520px; height: auto; margin-inline: auto; overflow: visible; }
.d-loop__arc { transition: stroke-dashoffset 120ms linear; }

.d-loop__dot {
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(calc(1 + 0.55 * var(--e, 0)));
  opacity: calc(0.45 + 0.55 * var(--e, 0));
}
.d-loop__ring {
  stroke: rgba(255, 255, 255, calc(0.16 + 0.26 * var(--e, 0)));
}

.d-loop__node .d-label { fill: var(--fg-dim); }
.d-loop__node[data-active="true"] .d-label { fill: var(--fg); }
.d-loop__centre { animation: d-centre 420ms var(--ease-out); }
@keyframes d-centre {
  from { opacity: 0; transform: translateY(5px); }
  to   { opacity: 1; transform: none; }
}
.d-loop__title {
  font-family: var(--font-display); font-size: calc(30px * var(--dscale, 1));
  font-weight: 600; letter-spacing: calc(-0.02em * var(--track-tight));
}

.d-arch { width: 100%; height: auto; overflow: visible; }
.d-arch__plate {
  fill: rgba(255,255,255,.035);
  stroke: rgba(255,255,255,.12);
  transition: fill var(--dur) var(--ease-out), stroke var(--dur) var(--ease-out);
}
.d-arch__row[data-tone="core"] .d-arch__plate {
  fill: rgb(var(--c-2-rgb) / .055);
  stroke: rgb(var(--c-2-rgb) / .24);
}
.d-arch__row {
  opacity: 0; transform: translateY(14px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
  transition-delay: calc(var(--i) * 110ms);
}
[data-reveal].is-in .d-arch__row { opacity: 1; transform: none; }
.d-arch__bracket.is-fast { color: var(--fg-faint); }
.d-arch__bracket.is-core { color: var(--c-2); }

.d-harness { width: 100%; height: auto; overflow: visible; }
.d-harness__plate { transition: stroke var(--dur-fast) linear, fill var(--dur-fast) linear; }
.d-harness__gate[data-state="fail"] .d-harness__plate {
  stroke: var(--c-fail); fill: rgba(255,93,93,.09);
}
.d-harness__token { filter: drop-shadow(0 0 9px rgb(var(--c-2-rgb) / .75)); }
.d-harness__rollback { opacity: .25; transition: opacity var(--dur-fast) linear; }
.d-harness__rollback[data-on="true"] { opacity: .9; }

.d-graph { width: 100%; height: auto; overflow: visible; }
.d-graph__edge {
  stroke-dasharray: 260; stroke-dashoffset: 260;
  transition: stroke-dashoffset 900ms var(--ease-out);
  transition-delay: calc(var(--i) * 90ms);
}
.d-graph__node {
  opacity: 0; transition: opacity 500ms var(--ease-out);
  transition-delay: calc(240ms + var(--i) * 90ms);
}
.trust__graph.is-in .d-graph__edge,
[data-reveal].is-in .d-graph__edge { stroke-dashoffset: 0; }
.trust__graph.is-in .d-graph__node,
[data-reveal].is-in .d-graph__node { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .d-chain__node, .d-graph__node { opacity: 1 !important; animation: none !important; }
  .d-graph__edge { stroke-dashoffset: 0 !important; }
  .d-axis__fill  { stroke-dashoffset: 0 !important; }
  .d-break__spark { display: none; }
}

@media (max-width: 43.75rem) {

  .d-chain, .d-break, .d-harness, .d-graph { max-width: 340px; margin-inline: auto; }
  .d-axis { width: 100%; height: auto; max-width: 320px; margin-inline: auto; }
  .d-arch { max-width: 360px; margin-inline: auto; }
  .d-loop { max-width: min(100%, 340px); }

  .d-loop .d-label--lg { font-size: calc(13px * var(--dscale, 1)); }
}

[data-diagram="chain"]   { aspect-ratio: 1000 / 150; }
[data-diagram="axis"]    { aspect-ratio: 1000 / 92;  }
[data-diagram="break"]   { min-height: 150px; }
[data-diagram="harness"] { min-height: 210px; }
[data-diagram="arch"]    { aspect-ratio: 760 / 430; }
[data-diagram="graph"]   { aspect-ratio: 540 / 270; }
[data-diagram="loop"]    { aspect-ratio: 1 / 1; }

@media (max-width: 43.75rem) {
  [data-diagram="chain"]   { aspect-ratio: 330 / 340; }
  [data-diagram="axis"]    { aspect-ratio: 320 / 240; }
  [data-diagram="break"]   { min-height: 404px; }
  [data-diagram="harness"] { min-height: 350px; }
  [data-diagram="arch"]    { aspect-ratio: 340 / 370; }
  [data-diagram="graph"]   { aspect-ratio: 320 / 350; }
}
@media (max-width: 53.75rem) {

  [data-diagram="loop"] { aspect-ratio: 1 / 1; max-width: 340px; margin-inline: auto; }
}

.d-arch__row[data-layer] { cursor: pointer; }

.d-arch__row[data-layer]:focus-visible .d-arch__plate {
  stroke: var(--c-2); stroke-width: 2;
}
.d-arch__row[data-selected="true"] .d-arch__plate {
  fill: rgb(var(--c-2-rgb) / 0.12);
  stroke: rgb(var(--c-2-rgb) / 0.55);
}

.d-arch__row[data-impacted="true"] .d-arch__plate {
  fill: rgb(var(--c-1-rgb) / 0.07);
  stroke: rgb(var(--c-1-rgb) / 0.3);
  stroke-dasharray: 4 3;
}
@media (hover: hover) { .d-arch__row[data-layer]:hover .d-arch__plate { stroke: rgba(255, 255, 255, 0.34); } }