/* =========================================================================
   CELEST — audit-grade light.
   Website structure stays; the audit-grade world brings paper, ink, hairlines,
   typography, and the rule that gradient appears only where the system does
   real work.
   ========================================================================= */

/* ---- Fonts ------------------------------------------------------------- */
@font-face {
  font-family: "Mona Sans";
  src: url("/fonts/MonaSans.woff2") format("woff2");
  font-weight: 200 900;
  font-stretch: 75% 125%;
  font-display: swap;
  font-style: normal;
}

@font-face {
  font-family: "Geist Mono";
  src: url("/fonts/GeistMono-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
  font-style: normal;
}

@font-face {
  font-family: "Geist Mono";
  src: url("/fonts/GeistMono-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
  font-style: normal;
}

/* ---- Tokens ------------------------------------------------------------ */
:root {
  --paper: #FEFEFD;
  --paper-2: #F6F8FC;
  --surface: #FFFFFF;

  --night: #0A0E2B;
  --night-2: #10163F;
  --night-line: rgba(160, 178, 240, 0.16);

  --ink: #0E1526;
  --ink-2: #454F6B;
  --ink-3: #6A7391;
  --on-night: #E8EDFF;
  --on-night-2: #A7B1DE;

  --c-cyan: #35C5EA;
  --c-sky: #24A6FA;
  --c-azure: #2E8BF0;
  --c-indigo: #5D70E8;
  --c-violet: #8389F7;
  --grad: linear-gradient(100deg, #35C5EA, #24A6FA, #2E8BF0, #5D70E8, #8389F7);

  --brand: #1A63D6;
  --brand-deep: #1454C2;
  --live: #0E9F6E;
  --warn: #C07D24;
  --road: #78829F;

  --line: #E4E9F2;
  --line-2: #D3DAEA;

  --sh-sm: 0 1px 2px rgba(15, 22, 48, 0.05), 0 3px 8px -2px rgba(15, 22, 48, 0.06);
  --sh: 0 2px 6px -2px rgba(16, 26, 60, 0.08), 0 14px 34px -14px rgba(16, 26, 60, 0.18);
  --sh-lg: 0 4px 12px -4px rgba(16, 26, 60, 0.12), 0 34px 70px -24px rgba(16, 26, 60, 0.26);

  --r: 14px;
  --r-sm: 10px;
  --r-lg: 20px;
  --pill: 999px;

  --wrap: 1160px;
  --gut: clamp(1.15rem, 4vw, 2.6rem);

  --font: "Mona Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Reset / base ------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-weight: 440;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
::selection { background: rgba(46, 139, 240, 0.18); }

.wrap { width: min(100% - calc(var(--gut) * 2), var(--wrap)); margin-inline: auto; }
main [id] { scroll-margin-top: 84px; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: 12px; }

:where(a, button, input, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---- Shared type ------------------------------------------------------- */
.eyebrow,
.kicker {
  font-family: var(--mono);
  font-size: 0.795rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-3);
  margin: 0 0 1.15rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  text-transform: none;
}

.eyebrow span,
.kicker::before {
  content: "";
  width: 1.7em;
  height: 3px;
  border-radius: 2px;
  background: var(--grad);
  flex: none;
}

.kicker--dark { color: var(--on-night-2); }

.section h2,
.closing h2 {
  margin: 0;
  font-size: clamp(2.65rem, 5vw, 4.8rem);
  line-height: 1.01;
  letter-spacing: -0.055em;
  font-weight: 760;
  text-wrap: balance;
}

.section__intro {
  margin-bottom: clamp(3rem, 5vw, 4.5rem);
}

.two-col-intro {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 8vw, 8rem);
  align-items: start;
}

.two-col-intro > p,
.proof__intro > p {
  max-width: 560px;
  margin: 0 0 0.4rem;
  color: var(--ink-2);
  font-size: 1.1rem;
  line-height: 1.7;
}

.two-col-intro--dark > p { color: var(--on-night-2); }

/* ---- Buttons ----------------------------------------------------------- */
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.45rem;
  min-height: 52px;
  padding: 0.78rem 1.3rem;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 560;
  line-height: 1.15;
  letter-spacing: -0.006em;
  cursor: pointer;
  transition:
    transform 0.28s var(--ease),
    box-shadow 0.28s var(--ease),
    background-color 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}

.button:hover { transform: translateY(-2px); }

.button--small { min-height: 42px; padding: 0.62rem 1.05rem; font-size: 0.9rem; }

.button--light {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--line);
  box-shadow: var(--sh-sm);
}

.button--primary {
  color: #fff;
  background: var(--brand);
  box-shadow: 0 1px 2px rgba(20, 40, 90, 0.25), 0 12px 26px -12px rgba(26, 99, 214, 0.7);
}

.button--primary:hover {
  background: var(--brand-deep);
  box-shadow: 0 2px 4px rgba(20, 40, 90, 0.25), 0 18px 34px -14px rgba(26, 99, 214, 0.72);
}

.button--ghost {
  color: var(--ink);
  background: transparent;
  border-color: var(--line-2);
}

.button--ghost:hover {
  border-color: var(--ink-3);
  background: rgba(46, 139, 240, 0.05);
}

.button--dark {
  color: #fff;
  background: var(--night);
  box-shadow: 0 15px 30px -18px rgba(7, 17, 31, 0.75);
}

/* ---- Topbar ------------------------------------------------------------ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.topbar.is-stuck {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  height: 66px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.brand span {
  font-weight: 680;
  font-size: 1.22rem;
  letter-spacing: -0.03em;
  font-stretch: 112%;
}

.topbar nav {
  display: flex;
  gap: 1.55rem;
  margin-left: auto;
  font-size: 0.94rem;
  color: var(--ink-2);
}

.topbar nav a {
  position: relative;
  padding: 4px 0;
  transition: color 0.2s ease;
}

.topbar nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -1px;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
  transition: right 0.3s var(--ease);
}

.topbar nav a:hover { color: var(--ink); }
.topbar nav a:hover::after { right: 0; }

.sections-menu {
  display: none;
  position: relative;
}

.sections-menu summary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.7rem;
  color: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--pill);
  cursor: pointer;
  list-style: none;
  background: rgba(255, 255, 255, 0.84);
  font-size: 0.8rem;
  font-weight: 650;
}

.sections-menu summary::-webkit-details-marker { display: none; }
.sections-menu summary::after { content: "⌄"; color: var(--c-azure); font-size: 0.9rem; line-height: 1; transition: transform 0.2s; }
.sections-menu[open] summary::after { transform: rotate(180deg); }

.sections-menu__panel {
  position: absolute;
  z-index: 30;
  top: calc(100% + 0.65rem);
  right: 0;
  display: none;
  gap: 0.1rem;
  min-width: 190px;
  margin: 0;
  padding: 0.45rem;
  color: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 20px 50px -25px rgba(0, 0, 0, 0.16);
  font-size: 0.84rem;
}

.sections-menu[open] .sections-menu__panel { display: grid; }

.sections-menu__panel a {
  padding: 0.58rem 0.65rem;
  border-radius: 8px;
}

.sections-menu__panel a:hover {
  color: var(--ink);
  background: rgba(79, 210, 216, 0.08);
}

.topbar__demo-short { display: none; }

/* ---- Hero -------------------------------------------------------------- */
.hero {
  position: relative;
  padding: clamp(2rem, 4.5vw, 4.2rem) 0 clamp(3.2rem, 6.5vw, 5.8rem);
  background:
    linear-gradient(180deg, var(--paper), var(--paper-2));
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(46, 139, 240, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 139, 240, 0.04) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 88%);
  pointer-events: none;
}

.hero .wrap { position: relative; z-index: 1; }

.hero__glow {
  position: absolute;
  z-index: 0;
  right: -6%;
  top: 8%;
  width: 46%;
  height: 78%;
  background: radial-gradient(60% 55% at 60% 40%, rgba(46, 139, 240, 0.12), rgba(131, 137, 247, 0.06) 45%, transparent 72%);
  filter: blur(10px);
  pointer-events: none;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.04fr 0.96fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.hero__copy { max-width: 39rem; }
.hero__product { margin: 0; }

.hero h1 {
  font-size: clamp(2.7rem, 6.6vw, 4.9rem);
  font-weight: 800;
  font-stretch: 118%;
  line-height: 1;
  letter-spacing: -0.035em;
  margin: 0 0 1.4rem;
  text-wrap: balance;
}

.hero h1 em,
.lifecycle h2 em,
.closing h2 em {
  color: var(--brand);
  font-style: normal;
}

.hero__lede {
  font-size: clamp(1.08rem, 1.5vw, 1.24rem);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 33rem;
  margin: 0 0 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 2.2rem;
}

.boundary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 1.2rem;
  margin: 0;
  padding: 1.45rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  max-width: 36rem;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.boundary li {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.boundary b { color: var(--ink); font-weight: 500; }

.status-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.status-dot--live { background: var(--live); box-shadow: 0 0 0 4px rgba(14, 159, 110, 0.16); }
.status-dot--next { border: 1.5px solid var(--warn); background: transparent; box-shadow: 0 0 0 4px rgba(192, 125, 36, 0.12); }

.window {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
}

.window__bar {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 48px;
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #FBFCFE, #F4F7FC);
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
}

.window__dots { display: inline-flex; gap: 6px; }
.window__dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-2); }

.window__phase {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
  color: var(--ink-3);
}

.window__phase > i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-azure);
  box-shadow: 0 0 0 4px rgba(46, 139, 240, 0.12);
}

.window__tag {
  padding: 0.24rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.agent-card {
  margin: 1rem;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface);
}

.agent-card__head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.agent-avatar {
  display: grid;
  place-items: center;
  width: 37px;
  height: 37px;
  border-radius: 10px;
  color: #06101D;
  background: var(--grad);
  font-weight: 800;
}

.agent-card__head strong { font-size: 0.92rem; color: var(--ink); }
.agent-card__head small { color: var(--ink-3); font-family: var(--mono); font-size: 0.68rem; line-height: 1.5; }

.pill {
  margin-left: auto;
  padding: 0.27rem 0.53rem;
  border-radius: var(--pill);
  font-family: var(--mono);
  font-size: 0.61rem;
  font-weight: 500;
}

.pill--warn {
  color: var(--warn);
  border: 1px solid rgba(192, 125, 36, 0.22);
  background: rgba(192, 125, 36, 0.09);
}

.agent-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 0;
}

.agent-facts div {
  padding: 0.66rem 0.8rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.agent-facts div:nth-child(2n) { border-right: 0; }
.agent-facts div:nth-last-child(-n + 2) { border-bottom: 0; }

.agent-facts dt {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.64rem;
  line-height: 1.4;
  text-transform: uppercase;
}

.agent-facts dd {
  margin: 0.18rem 0 0;
  font-size: 0.78rem;
  color: var(--ink);
}

.agent-facts dd small {
  color: var(--live);
  font-family: var(--mono);
  font-size: 0.6rem;
}

.agent-facts .unknown { color: var(--ink-3); font-style: italic; }

.mini-loop-shell {
  position: relative;
  overflow: hidden;
  margin: 0.2rem 1rem 1rem;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: linear-gradient(180deg, #FBFCFE, #F5F8FD);
}

.mini-loop { list-style: none; margin: 0; padding: 0.25rem; }

.mini-loop li {
  display: grid;
  grid-template-columns: 25px 1fr auto 12px;
  align-items: center;
  gap: 0.6rem;
  min-height: 43px;
  padding: 0.35rem 0.55rem;
  border-radius: 9px;
  color: var(--ink);
}

.mini-loop li > span {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.64rem;
}

.mini-loop li > b { font-size: 0.76rem; }

.mini-loop li > small {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.mini-loop li > i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--line-2);
  background: var(--surface);
}

.mini-loop li.is-gate {
  grid-template-columns: 25px 1fr auto auto;
}

.mini-loop li.is-gate em {
  min-width: 88px;
  padding: 0.23rem 0.46rem;
  color: var(--warn);
  border-radius: var(--pill);
  background: rgba(192, 125, 36, 0.1);
  font: normal 0.55rem var(--mono);
  text-align: center;
}

.gate-wait, .gate-ok { display: none; }

.loop-receipt {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.7rem;
  min-height: 40px;
  margin: 0 0.55rem 0.55rem;
  padding: 0.55rem 0.68rem;
  color: var(--ink-3);
  border: 1px solid rgba(14, 159, 110, 0.18);
  border-radius: 9px;
  background: linear-gradient(90deg, rgba(14, 159, 110, 0.08), transparent);
  font-family: var(--mono);
  font-size: 0.56rem;
  line-height: 1.4;
}

.loop-receipt strong { color: var(--live); font-weight: 500; }

.loop-receipt i {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  color: #07111F;
  border-radius: 50%;
  background: var(--live);
  font: 700 0.66rem/1 var(--font);
}

.window__foot {
  margin: 0;
  padding: 0.85rem 1.15rem;
  border-top: 1px solid var(--line);
  background: #FBFCFE;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.73rem;
  line-height: 1.4;
  text-align: center;
}

.hero__scan {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 20%, var(--line) 80%, transparent);
}

/* Illustrative loop timing contract, preserved on website structure. */
.motion-mounted .loop-receipt { opacity: 0; }
.motion-mounted[data-receipt-visible="true"] .loop-receipt { opacity: 1; }
.motion-mounted .mini-loop li[data-motion-state="idle"] { background: transparent; box-shadow: none; }
.motion-mounted .mini-loop li[data-motion-state="idle"] > i { border: 1.5px solid var(--line-2); background: transparent; box-shadow: none; }
.motion-mounted .mini-loop li[data-motion-state="active"] { background: linear-gradient(90deg, rgba(46, 139, 240, 0.1), rgba(131, 137, 247, 0.045)); box-shadow: inset 0 0 0 1px rgba(46, 139, 240, 0.16); }
.motion-mounted .mini-loop li[data-motion-state="active"] > i { border-color: transparent; background: var(--grad); box-shadow: 0 0 0 4px rgba(46, 139, 240, 0.16); }
.motion-mounted .mini-loop li[data-motion-state="done"] > span { color: var(--c-indigo); }
.motion-mounted .mini-loop li[data-motion-state="done"] > i { border-color: transparent; background: radial-gradient(circle, var(--c-azure), var(--c-indigo)); }
.motion-mounted .mini-loop li[data-motion-state="waiting"] { background: linear-gradient(90deg, rgba(192, 125, 36, 0.11), transparent); box-shadow: inset 0 0 0 1px rgba(192, 125, 36, 0.24); }
.motion-mounted .mini-loop li[data-motion-state="waiting"] .gate-label { display: none; }
.motion-mounted .mini-loop li[data-motion-state="waiting"] .gate-wait { display: inline; }
.motion-mounted .mini-loop li[data-motion-state="approved"] { background: linear-gradient(90deg, rgba(14, 159, 110, 0.1), transparent); box-shadow: inset 0 0 0 1px rgba(14, 159, 110, 0.2); }
.motion-mounted .mini-loop li[data-motion-state="approved"] em { color: var(--live); background: rgba(14, 159, 110, 0.12); }
.motion-mounted .mini-loop li[data-motion-state="approved"] .gate-label { display: none; }
.motion-mounted .mini-loop li[data-motion-state="approved"] .gate-ok { display: inline; }
.motion-mounted .mini-loop li.is-gate[data-motion-state="done"] em { color: var(--live); background: rgba(14, 159, 110, 0.12); }
.motion-mounted .mini-loop li.is-gate[data-motion-state="done"] .gate-label { display: none; }
.motion-mounted .mini-loop li.is-gate[data-motion-state="done"] .gate-ok { display: inline; }
.motion-mounted[data-loop-phase="approve"] .window__phase > i { background: var(--warn); box-shadow: 0 0 0 4px rgba(192, 125, 36, 0.14); }
.motion-mounted[data-loop-phase="approved"] .window__phase > i,
.motion-mounted[data-loop-phase="reconcile"] .window__phase > i { background: var(--live); box-shadow: 0 0 0 4px rgba(14, 159, 110, 0.16); }
.motion-mounted[data-loop-phase="approve"] .pill { color: var(--warn); border-color: rgba(192, 125, 36, 0.24); background: rgba(192, 125, 36, 0.1); }
.motion-mounted[data-loop-phase="approved"] .pill,
.motion-mounted[data-loop-phase="reconcile"] .pill { color: var(--live); border-color: rgba(14, 159, 110, 0.22); background: rgba(14, 159, 110, 0.09); }

/* ---- Principles strip -------------------------------------------------- */
.principles {
  border-block: 1px solid var(--line);
  background: var(--paper);
}

.principles__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.principles span {
  position: relative;
  padding: 1rem 1.2rem 1rem 1.1rem;
  border-right: 1px solid var(--line);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 500;
}

.principles span::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 0.6rem;
  border-radius: 50%;
  background: var(--c-azure);
  vertical-align: 0.12em;
}

.principles span:first-child { padding-left: 0; }
.principles span:last-child { border-right: 0; }

/* ---- Sections ---------------------------------------------------------- */
.section { padding: clamp(3rem, 6vw, 5.8rem) 0; }
.section--light { background: linear-gradient(180deg, var(--paper), var(--paper-2)); }

#why {
  padding-top: clamp(1.45rem, 3vw, 2.35rem);
}

#why .section__intro {
  margin-bottom: clamp(1.9rem, 3.4vw, 3rem);
}

/* ---- Gap / join -------------------------------------------------------- */
.join-map {
  display: grid;
  grid-template-columns: 1fr 85px 1.15fr;
  align-items: center;
  gap: 1.4rem;
}

.source-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

.source-grid article {
  display: grid;
  gap: 0.18rem;
  min-height: 105px;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  box-shadow: var(--sh-sm);
}

.source-grid b { font-size: 0.84rem; }
.source-grid span { color: var(--ink-2); font-family: var(--mono); font-size: 0.68rem; line-height: 1.45; }
.source-grid small { align-self: end; color: var(--ink-3); font-size: 0.7rem; font-style: italic; }

.join-arrow {
  display: grid;
  justify-items: center;
  gap: 0.4rem;
  color: var(--c-azure);
}

.join-arrow span {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.58rem;
  writing-mode: vertical-rl;
}

.join-arrow b { font-size: 1.5rem; font-weight: 400; }

.canonical-card {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  box-shadow: var(--sh);
}

.canonical-card header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #FBFCFE, #F5F8FD);
}

.canonical-card header > span {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  color: #fff;
  background: var(--grad);
  padding: 0.24rem 0.6rem;
  border-radius: var(--pill);
}

.canonical-card header code {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.74rem;
}

.canonical-card header small {
  margin-left: auto;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.canonical-card dl {
  margin: 0;
  padding: 0.4rem 1rem 0.8rem;
}

.canonical-card dl div {
  display: grid;
  grid-template-columns: 105px 1fr;
  gap: 1rem;
  padding: 0.62rem 0;
  border-bottom: 1px solid var(--line);
}

.canonical-card dl div:last-child { border-bottom: 0; }
.canonical-card dt { color: var(--ink-3); font-size: 0.78rem; }
.canonical-card dd { margin: 0; font-size: 0.84rem; color: var(--ink); }
.canonical-card dd small { display: block; color: var(--ink-3); font-family: var(--mono); font-size: 0.62rem; }
.canonical-card dd.unknown,
.canonical-card dd.warning { color: var(--warn); }

.join-coda {
  max-width: 800px;
  margin: 2.5rem auto 0;
  color: var(--ink-2);
  font-size: 1.06rem;
  line-height: 1.7;
  text-align: center;
}

/* ---- Lifecycle band ---------------------------------------------------- */
.lifecycle {
  color: var(--on-night);
  background:
    radial-gradient(70% 60% at 82% 0%, rgba(93, 112, 232, 0.28), transparent 60%),
    radial-gradient(60% 50% at 5% 100%, rgba(53, 197, 234, 0.14), transparent 55%),
    var(--night);
}

.lifecycle-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  margin: 0;
  padding: 0;
  border: 1px solid var(--night-line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--night-line);
  gap: 1px;
}

.lifecycle-grid li {
  display: flex;
  flex-direction: column;
  min-height: 220px;
  padding: 1.35rem;
  background: var(--night);
  color: #DBE7F5;
  grid-column: span 3;
}

.lifecycle-grid li:nth-child(n + 5) { grid-column: span 4; }
.lifecycle-grid li > span { margin-bottom: 2rem; color: #7F92AE; font-family: var(--mono); font-size: 0.7rem; }
.lifecycle-grid strong { font-size: 1.05rem; }
.lifecycle-grid p { margin: 0.5rem 0 1.2rem; color: #8D9DB5; font-size: 0.86rem; line-height: 1.55; }
.lifecycle-grid small { margin-top: auto; color: #6F819A; font-family: var(--mono); font-size: 0.65rem; }
.lifecycle-grid .live { background: linear-gradient(155deg, rgba(77, 210, 215, 0.07), transparent 55%), var(--night); }
.lifecycle-grid .live small { color: var(--live); }
.lifecycle-grid .next { background: linear-gradient(155deg, rgba(46, 149, 241, 0.12), transparent 55%), var(--night); }
.lifecycle-grid .next small { color: #68B8FA; }
.lifecycle-grid .gate { background: linear-gradient(155deg, rgba(192, 125, 36, 0.18), transparent 65%), var(--night); box-shadow: inset 0 0 0 1px rgba(192, 125, 36, 0.24); }
.lifecycle-grid .gate small { color: #F0BD67; }

/* ---- Review ------------------------------------------------------------ */
.review {
  background: linear-gradient(180deg, var(--paper), var(--paper-2));
  border-block: 1px solid var(--line);
}

.review__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 8vw, 8rem);
  align-items: center;
}

.review__copy > p:not(.kicker) {
  max-width: 610px;
  margin: 1.5rem 0;
  color: var(--ink-2);
  font-size: 1.08rem;
  line-height: 1.7;
}

.review__facts {
  display: flex;
  gap: 1.6rem;
  margin: 1.8rem 0 2.2rem;
}

.review__facts span {
  display: grid;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.review__facts b {
  margin-bottom: 0.18rem;
  color: var(--ink);
  font: 700 0.9rem var(--font);
}

.deliverables {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  box-shadow: var(--sh-sm);
}

.deliverables > p {
  margin: 0;
  padding: 0 0 1rem;
  color: var(--ink-3);
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.deliverables ul { list-style: none; margin: 0; padding: 0; }

.deliverables li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 0.8rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.91rem;
}

.deliverables li:last-child { border-bottom: 0; }
.deliverables li span { color: var(--c-azure); font-family: var(--mono); font-size: 0.68rem; }

/* ---- Proof ------------------------------------------------------------- */
.proof {
  background: var(--paper);
}

.proof__intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: end;
}

.proof-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--line);
  box-shadow: var(--sh-sm);
}

.proof-grid article {
  min-height: 220px;
  padding: 1.6rem;
  background: var(--surface);
}

.proof-grid h3 { margin: 1.2rem 0 0.55rem; font-size: 1.2rem; }
.proof-grid p { max-width: 480px; margin: 0; color: var(--ink-2); font-size: 0.9rem; line-height: 1.65; }

.proof-level {
  display: inline-flex;
  font-family: var(--mono);
  font-size: 0.65rem;
}

.proof-level--live { color: var(--live); }
.proof-level--experimental { color: var(--warn); }

.proof__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
}

.proof__actions a {
  color: var(--ink-2);
  border-bottom: 1px solid var(--line-2);
  font-size: 0.9rem;
}

.proof__actions a:hover { color: var(--ink); }

/* ---- Continuity / story ------------------------------------------------ */
.story {
  background: linear-gradient(180deg, var(--paper), var(--paper-2));
}

.story__grid {
  display: grid;
  grid-template-columns: 0.65fr 1.35fr;
  align-items: center;
  gap: clamp(3rem, 9vw, 9rem);
}

.story__mark {
  display: grid;
  place-items: center;
  width: min(100%, 400px);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle, #FFFFFF, #EEF6FC 72%);
}

.story__mark img {
  width: min(76%, 304px);
  height: min(76%, 304px);
  max-width: none;
  object-fit: contain;
}

/* ---- Error page -------------------------------------------------------- */
.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.error-shell {
  flex: 1;
  display: grid;
  align-items: center;
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  background:
    radial-gradient(60% 80% at 50% -10%, rgba(46, 139, 240, 0.12), transparent 60%),
    linear-gradient(180deg, var(--paper), var(--paper-2));
}

.error-card {
  display: grid;
  gap: 1.4rem;
  padding: clamp(1.8rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--sh-lg);
}

.error-card h1 {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.05em;
}

.error-card p:not(.kicker) {
  margin: 0;
  max-width: 44rem;
  color: var(--ink-2);
  font-size: 1.05rem;
  line-height: 1.7;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.error-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  margin: 0;
  padding: 1.2rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.story p:not(.kicker) {
  max-width: 680px;
  color: var(--ink-2);
  font-size: 1.03rem;
  line-height: 1.75;
}

.story blockquote {
  margin: 2rem 0 0;
  padding-left: 1.3rem;
  border-left: 3px solid var(--c-cyan);
  font-size: 1.18rem;
  font-weight: 700;
}

/* ---- Closing ----------------------------------------------------------- */
.closing {
  padding: clamp(4.6rem, 8vw, 7.4rem) 0;
  text-align: center;
  background:
    radial-gradient(60% 80% at 50% -10%, rgba(46, 139, 240, 0.12), transparent 60%),
    var(--paper);
}

.closing__inner { max-width: 54rem; margin-inline: auto; }
.closing h2 {
  font-size: clamp(3rem, 6.9vw, 5rem);
  line-height: 1.06;
}
.closing p:not(.kicker) { margin: 0 auto 2rem; color: var(--ink-2); font-size: 1.1rem; line-height: 1.55; max-width: 34rem; }
.closing__inner > div { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.8rem; }

/* ---- Footer ------------------------------------------------------------ */
footer {
  background: var(--ink);
  color: #C3CBE4;
  padding: clamp(2.6rem, 5vw, 3.6rem) 0 2.2rem;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem 3rem;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.brand--footer span { color: #fff; }
.footer__inner p { margin: 0; font-size: 0.92rem; color: #9AA4C6; max-width: 22rem; }

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 1.6rem;
  font-size: 0.92rem;
}

footer nav a { color: #C3CBE4; transition: color 0.2s ease; }
footer nav a:hover { color: #fff; }

.footer__legal {
  padding-top: 1.6rem;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  font-size: 0.78rem;
  color: #7883A8;
  line-height: 1.5;
}

/* ---- Learn ------------------------------------------------------------- */
.learn-page { background: var(--paper); }

.learn-hero {
  padding: clamp(4.4rem, 8vw, 7.2rem) 0 clamp(3rem, 6vw, 5rem);
  background:
    radial-gradient(70% 90% at 82% -20%, rgba(46, 139, 240, 0.11), transparent 62%),
    linear-gradient(180deg, var(--paper), var(--paper-2));
  border-bottom: 1px solid var(--line);
}

.learn-hero__inner { max-width: 62rem; }
.learn-hero h1,
.learn-index-hero h1 {
  margin: 0;
  max-width: 15ch;
  font-size: clamp(3rem, 7.5vw, 5.8rem);
  font-weight: 780;
  line-height: 0.98;
  letter-spacing: -0.058em;
  text-wrap: balance;
}

.learn-hero__answer {
  max-width: 48rem;
  margin: clamp(1.7rem, 4vw, 2.6rem) 0 0;
  font-size: clamp(1.2rem, 2.1vw, 1.55rem);
  line-height: 1.6;
  color: var(--ink-2);
  text-wrap: pretty;
}

.learn-meta {
  display: grid;
  grid-template-columns: max-content max-content minmax(16rem, 1fr);
  gap: 1rem 2.8rem;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-2);
}

.learn-meta div { display: grid; gap: 0.28rem; }
.learn-meta dt,
.learn-formats span,
.learn-publication dt {
  font-family: var(--mono);
  color: var(--ink-3);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}
.learn-meta dd { margin: 0; font-size: 0.9rem; color: var(--ink-2); }

.learn-layout {
  display: grid;
  grid-template-columns: 13.5rem minmax(0, 45rem);
  justify-content: center;
  gap: clamp(3rem, 8vw, 7.5rem);
  padding-block: clamp(3.5rem, 7vw, 6.5rem);
}

.learn-toc {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow: auto;
}
.learn-toc > strong {
  display: block;
  margin-bottom: 0.9rem;
  font-family: var(--mono);
  font-size: 0.78rem;
}
.learn-toc ol { display: grid; gap: 0.62rem; margin: 0; padding: 0; list-style: none; }
.learn-toc li { font-size: 0.84rem; line-height: 1.35; color: var(--ink-3); }
.learn-toc a { transition: color 0.2s ease; }
.learn-toc a:hover { color: var(--brand); }
.learn-formats { display: flex; flex-wrap: wrap; gap: 0.35rem 0.8rem; margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.learn-formats span { flex-basis: 100%; }
.learn-formats a { color: var(--brand); font-family: var(--mono); font-size: 0.75rem; text-decoration: underline; text-underline-offset: 3px; }

.learn-content { min-width: 0; }
.learn-content > section { padding-top: 1rem; margin-bottom: clamp(3rem, 6vw, 4.7rem); scroll-margin-top: 92px; }
.learn-content h2,
.learn-related h2 {
  margin: 0 0 1.4rem;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
  font-weight: 740;
  text-wrap: balance;
}
.learn-content p,
.learn-content li {
  font-size: clamp(1.03rem, 1.5vw, 1.12rem);
  line-height: 1.75;
  color: var(--ink-2);
}
.learn-content p { margin: 0 0 1.25rem; }
.learn-content ul { display: grid; gap: 0.65rem; padding-left: 1.25rem; }
.learn-content li::marker { color: var(--brand); }
.learn-content a:not(.learn-related-card) { color: var(--brand-deep); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }

.learn-scope,
.learn-callout {
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--line-2);
  border-left: 4px solid var(--brand);
  border-radius: var(--r-sm);
  background: var(--surface);
  box-shadow: var(--sh-sm);
}
.learn-scope { margin-bottom: clamp(3.2rem, 6vw, 5rem); }
.learn-callout { margin: 1.8rem 0; background: var(--paper-2); }
.learn-scope > strong,
.learn-callout > strong,
.learn-publication > strong {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}
.learn-scope p,
.learn-callout p { margin: 0.4rem 0 0; font-size: 0.98rem; }

.learn-citations { white-space: nowrap; }
.learn-citations a { font-family: var(--mono); font-size: 0.72em; font-weight: 500; }

.learn-table-wrap {
  margin: 1.8rem 0;
  overflow-x: auto;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--surface);
  box-shadow: var(--sh-sm);
}
.learn-table-wrap:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }
.learn-content table { width: 100%; min-width: 42rem; border-collapse: collapse; }
.learn-content caption { padding: 1rem 1.15rem; text-align: left; font-family: var(--mono); font-size: 0.78rem; color: var(--ink-3); }
.learn-content th,
.learn-content td { padding: 0.9rem 1rem; border-top: 1px solid var(--line); text-align: left; vertical-align: top; font-size: 0.88rem; line-height: 1.5; }
.learn-content thead th { background: var(--paper-2); color: var(--ink-3); font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.025em; text-transform: uppercase; }
.learn-content tbody th { width: 8.5rem; color: var(--ink); font-weight: 650; }

.learn-sources { display: grid; gap: 1.2rem; padding: 0; list-style: none; }
.learn-sources li { display: grid; grid-template-columns: 2rem 1fr; gap: 0.7rem; }
.learn-sources li > span { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-3); padding-top: 0.24rem; }
.learn-sources a { font-weight: 620; }
.learn-sources p { margin: 0.25rem 0 0; font-size: 0.9rem; line-height: 1.55; }

.learn-publication { margin-top: 5rem; padding: 1.4rem; border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--paper-2); }
.learn-publication dl { display: grid; gap: 0.8rem; margin: 1rem 0 0; }
.learn-publication dl div { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 1rem; }
.learn-publication dd { min-width: 0; margin: 0; font-size: 0.84rem; overflow-wrap: anywhere; }
.learn-publication code { font-family: var(--mono); font-size: 0.72rem; }

.learn-related { padding: clamp(4rem, 8vw, 7rem) 0; background: var(--night); color: var(--on-night); }
.learn-related .kicker { color: var(--on-night-2); }
.learn-related h2 { max-width: 12ch; }
.learn-related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 2.2rem; }
.learn-related-card { position: relative; display: grid; gap: 0.55rem; min-height: 12rem; padding: 1.5rem; border: 1px solid var(--night-line); border-radius: var(--r); background: rgba(255, 255, 255, 0.04); }
.learn-related-card strong { color: #fff; font-size: 1.18rem; }
.learn-related-card span { max-width: 30rem; color: var(--on-night-2); line-height: 1.55; }
.learn-related-card i { align-self: end; color: var(--c-cyan); font-style: normal; font-size: 1.25rem; }

.learn-index-hero { padding: clamp(5rem, 10vw, 9rem) 0 clamp(3.5rem, 7vw, 6rem); border-bottom: 1px solid var(--line); }
.learn-index-hero h1 { max-width: 17ch; }
.learn-index-hero > .wrap > p:last-child { max-width: 45rem; margin: 2rem 0 0; color: var(--ink-2); font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.65; }
.learn-index-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; padding-block: clamp(3rem, 7vw, 6rem); }
.learn-index-card { display: grid; gap: 0.8rem; min-height: 18rem; padding: clamp(1.5rem, 4vw, 2.2rem); border: 1px solid var(--line-2); border-radius: var(--r); background: var(--surface); box-shadow: var(--sh-sm); transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease); }
.learn-index-card:hover { transform: translateY(-3px); box-shadow: var(--sh); }
.learn-index-card > span { font-family: var(--mono); font-size: 0.74rem; color: var(--ink-3); }
.learn-index-card strong { max-width: 20ch; font-size: clamp(1.5rem, 3vw, 2.2rem); line-height: 1.08; letter-spacing: -0.035em; }
.learn-index-card p { margin: 0; color: var(--ink-2); line-height: 1.6; }
.learn-index-card i { align-self: end; color: var(--brand); font-style: normal; font-weight: 620; }

/* ---- Reveal ------------------------------------------------------------ */
.js .reveal { opacity: 0; transform: translateY(18px); }
.js .reveal.is-in { opacity: 1; transform: none; transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js .reveal-stagger > * { opacity: 0; transform: translateY(14px); }
.js .reveal-stagger.is-in > * { opacity: 1; transform: none; transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.js .reveal-stagger.is-in > *:nth-child(2) { transition-delay: 0.06s; }
.js .reveal-stagger.is-in > *:nth-child(3) { transition-delay: 0.12s; }
.js .reveal-stagger.is-in > *:nth-child(4) { transition-delay: 0.18s; }
.js .reveal-stagger.is-in > *:nth-child(5) { transition-delay: 0.24s; }
.js .reveal-stagger.is-in > *:nth-child(6) { transition-delay: 0.3s; }

/* ---- Responsive -------------------------------------------------------- */
@media (max-width: 1000px) {
  .topbar nav { display: none; }
  .sections-menu { display: block; }
  .topbar .button { margin-left: auto; }

  .hero__grid { grid-template-columns: 1fr; }
  .hero__copy { max-width: 760px; }
  .hero__product { width: 100%; max-width: 34rem; margin-inline: auto; }

  .join-map { grid-template-columns: 1fr; }
  .join-arrow { transform: rotate(90deg); }
  .join-arrow span { display: none; }

  .proof__intro,
  .review__grid,
  .story__grid { grid-template-columns: 1fr; gap: 2.5rem; }

  .lifecycle-grid { grid-template-columns: repeat(2, 1fr); }
  .lifecycle-grid li,
  .lifecycle-grid li:nth-child(n + 5) { grid-column: auto; }

  .principles__inner { grid-template-columns: 1fr 1fr; }
  .principles span:nth-child(2) { border-right: 0; }
  .principles span:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .principles span:nth-child(3) { padding-left: 0; }
}

@media (max-width: 760px) {
  .topbar__inner { height: 68px; gap: 1rem; }
  .brand span { font-size: 1.2rem; }
  .brand img { width: 33px; height: 33px; }
  .topbar .button { font-size: 0.77rem; }
  .sections-menu summary { padding-inline: 0.62rem; }

  .hero { padding-top: 2.8rem; }
  .hero__grid { gap: 1.8rem; }
  .hero h1 { margin-bottom: 1.1rem; font-size: clamp(2.95rem, 14vw, 4.6rem); }
  .hero__lede { margin-bottom: 1.45rem; font-size: 1rem; line-height: 1.55; }
  .hero__actions { margin-bottom: 1rem; }

  .two-col-intro { grid-template-columns: 1fr; gap: 2.3rem; }
  .source-grid { grid-template-columns: 1fr; }
  .review__facts { display: grid; grid-template-columns: 1fr 1fr; }
  .footer__inner { align-items: flex-start; }
  .footer__legal { flex-direction: column; gap: 0.4rem; }

  .learn-meta { grid-template-columns: 1fr 1fr; }
  .learn-meta div:last-child { grid-column: 1 / -1; }
  .learn-layout { grid-template-columns: 1fr; gap: 2rem; }
  .learn-toc { position: static; max-height: none; padding: 1rem; border: 1px solid var(--line); border-radius: var(--r-sm); }
  .learn-toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-related-grid,
  .learn-index-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .topbar__inner { gap: 0.55rem; }
  .topbar .button { padding-inline: 0.78rem; }
  .topbar .button .topbar__demo-arrow { display: none; }
  .sections-menu summary { font-size: 0.75rem; }
  .topbar__demo-long { display: none; }
  .topbar__demo-short { display: inline; }

  .window__phase { display: none; }
  .window__bar { gap: 0.45rem; padding-inline: 0.7rem; font-size: 0.65rem; }
  .window__tag { padding-inline: 0.4rem; font-size: 0.55rem; }

  .hero__actions { display: grid; }
  .hero__actions .button { width: 100%; }
  .boundary { display: grid; gap: 0.4rem; font-size: 0.74rem; }

  .agent-card { margin: 0.7rem; }
  .agent-card__head { padding: 0.7rem; }
  .agent-avatar { width: 34px; height: 34px; }
  .agent-card__head small { font-size: 0.6rem; }
  .agent-facts dt { font-size: 0.6rem; }
  .agent-facts dd { font-size: 0.72rem; }
  .agent-facts dd small { font-size: 0.56rem; }
  .agent-facts div { padding: 0.52rem 0.65rem; }

  .mini-loop-shell { margin-inline: 0.7rem; }
  .mini-loop li { grid-template-columns: 22px 1fr 10px; min-height: 37px; padding-block: 0.25rem; }
  .mini-loop li > small { display: none; }
  .mini-loop li.is-gate { grid-template-columns: 22px 1fr auto; }
  .loop-receipt { grid-template-columns: 1fr auto; min-height: 36px; padding-block: 0.45rem; }
  .loop-receipt > span { display: none; }

  .principles__inner { grid-template-columns: 1fr; }
  .principles span {
    padding-left: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .principles span:last-child { border-bottom: 0; }

  .canonical-card header { flex-wrap: wrap; }
  .canonical-card header small { width: 100%; margin-left: 0; }
  .canonical-card dl div { grid-template-columns: 84px 1fr; gap: 0.7rem; }

  .lifecycle-grid,
  .proof-grid { grid-template-columns: 1fr; }
  .lifecycle-grid li { min-height: 190px; }
  .review__facts { grid-template-columns: 1fr; gap: 0.8rem; }
  .review .button { width: 100%; }
  .story__mark { width: min(100%, 240px); }
  .story__mark img {
    width: min(78%, 188px);
    height: min(78%, 188px);
  }

  .error-actions .button { width: 100%; }

  .learn-hero { padding-top: 3.3rem; }
  .learn-hero h1,
  .learn-index-hero h1 { font-size: clamp(2.8rem, 14vw, 4.2rem); }
  .learn-meta { grid-template-columns: 1fr; }
  .learn-meta div:last-child { grid-column: auto; }
  .learn-toc ol { grid-template-columns: 1fr; }
  .learn-publication dl div { grid-template-columns: 1fr; gap: 0.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal, .js .reveal-stagger > * { opacity: 1 !important; transform: none !important; }
  .button:hover { transform: none; }
  * { transition-duration: 0.01ms !important; }
}