/* =========================================================
   SYNTHSER — Architectural Design Principles v1.0
   Grayscale-only material (6 hexes). Technical Serif for
   headings/prose; Technical Monospace for data/logs/inputs.
   Rule 4.1 Strict Flat: no gradients, shadows, radii.
   Rule 4.2 Binary State: no transitions — states snap.
   Rule 4.3 Data Fidelity: minimal framing, max data-to-ink.
   ========================================================= */

:root {
  /* The only permitted values (Section 2) */
  --g-struct:   #2A2A2A;  /* primary structural: borders, primary text, dark surfaces */
  --g-func:     #CCCCCC;  /* functional interface: active vectors, terminal, hover snap */
  --g-sub:      #595959;  /* subroutine detail: secondary text, inactive, secondary viz */
  --g-arch:     #4F4F4F;  /* architectural base: mid shading / secondary text */
  --g-conflict: #808080;  /* conflict marker: errors, friction, table demarcation */
  --g-draft:    #F2F2F2;  /* document drafting: canvas, light surfaces */

  --serif: "Source Serif 4", Georgia, "Times New Roman", Times, serif;
  --mono:  "JetBrains Mono", "Courier New", Courier, monospace;

  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --rule: 1px;

  color-scheme: light;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--serif);
  background-color: var(--g-draft);
  background-image: 
    linear-gradient(to right, rgba(42, 42, 42, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 42, 42, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--g-struct);
  line-height: 1.65;
  font-size: clamp(16px, 0.9vw + 0.9rem, 18px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: 0; }
input { font: inherit; }

::selection { background: var(--g-struct); color: var(--g-draft); }
:focus-visible { outline: 2px solid var(--g-struct); outline-offset: 3px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--g-struct); color: var(--g-draft); padding: .6rem 1rem;
  font-family: var(--mono);
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.section { position: relative; padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.section + .section { border-top: 1px solid var(--g-struct); }   /* structural demarcation */

.section__head { max-width: 760px; margin-bottom: clamp(2rem, 4vw, 3rem); }
.eyebrow {
  font-family: var(--mono);
  font-size: .76rem; font-weight: 500; letter-spacing: .14em;
  color: var(--g-sub); text-transform: uppercase;
  margin-bottom: 1.1rem;
}
.section__title {
  font-family: var(--serif);
  font-weight: 700; line-height: 1.1; letter-spacing: -0.01em;
  font-size: clamp(1.85rem, 1.3rem + 2.2vw, 3rem);
}
.section__lede {
  margin-top: 1.1rem; color: var(--g-arch);
  font-size: clamp(1.02rem, 0.95rem + 0.4vw, 1.2rem); max-width: 62ch;
}

/* grayscale emphasis (replaces cyan/crimson spans) */
.hl-cyan { font-weight: 700; border-bottom: 1px solid var(--g-struct); }                 /* positive/active emphasis */
.hl-crim { background: var(--g-conflict); color: var(--g-draft); padding: 0 .18em; }     /* conflict/negative emphasis */

/* Drafting grid removed — Rule 4.1 (no gradients) + Rule 4.3 (strip decoration).
   Clean canvas, like formal research documentation. */

/* =========================================================
   ACTION VECTORS (Section 5: Buttons)
   1px #2A2A2A border, #F2F2F2 bg. Hover snaps to #CCCCCC.
   ========================================================= */
.btn {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--serif); font-weight: 600; font-size: .98rem;
  letter-spacing: .01em;
  padding: .72rem 1.2rem;
  border: 1px solid var(--g-struct);
  background: var(--g-draft);
  color: var(--g-struct);
  white-space: nowrap;
  /* Rule 4.2: no transition — hover snaps instantly */
}
.btn:hover, .btn:focus-visible { background: var(--g-func); }
.btn:active { background: var(--g-sub); color: var(--g-draft); }
.btn--primary, .btn--solid { background: var(--g-struct); color: var(--g-draft); }
.btn--primary:hover, .btn--primary:focus-visible,
.btn--solid:hover, .btn--solid:focus-visible { background: var(--g-arch); color: var(--g-draft); }
.btn--ghost { /* inherits base action vector */ }
.btn--lg { padding: .9rem 1.5rem; font-size: 1.05rem; }

/* ---------- Brand ---------- */
.brand { display: inline-flex; align-items: center; }
.brand__name {
  font-family: var(--serif); font-weight: 700; font-size: 1.2rem;
  letter-spacing: .22em; text-transform: uppercase; color: var(--g-struct);
}
.brand--footer .brand__name { font-size: 1rem; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--g-draft);
  border-bottom: 1px solid var(--g-struct);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.nav__links { display: flex; gap: clamp(1rem, 2.5vw, 2.2rem); }
.nav__links a {
  font-family: var(--mono); font-size: .76rem; font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase; color: var(--g-sub);
}
.nav__links a:hover { color: var(--g-struct); }       /* snap */
.nav__actions { display: flex; align-items: center; gap: .75rem; }
/* mobile drawer removed — single top bar (no duplicate nav) */

/* =========================================================
   HERO
   ========================================================= */
.hero { padding-top: clamp(1.75rem, 3.5vw, 3rem); }
.hero__grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: clamp(2rem, 5vw, 4.5rem); align-items: center;
}
.hero__title {
  font-family: var(--serif); font-weight: 700; line-height: 1.06; letter-spacing: -0.015em;
  font-size: clamp(2.2rem, 1.3rem + 3.6vw, 4rem);
  max-width: 15ch; margin: .4rem 0 1.4rem;
}
.hero__sub { color: var(--g-arch); font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.24rem); max-width: 52ch; }
.hero__sub strong { color: var(--g-struct); font-weight: 700; }

.hero__stats {
  display: grid; grid-template-columns: repeat(4, auto); gap: clamp(1rem, 3vw, 2.5rem);
  margin-top: 2.2rem; padding-top: 1.5rem; border-top: 1px solid var(--g-struct);
}
.stat__n { display: block; font-family: var(--mono); font-weight: 700; font-size: clamp(1.1rem, 0.9rem + 1vw, 1.6rem); color: var(--g-struct); }
.stat__l { display: block; font-family: var(--mono); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; color: var(--g-sub); margin-top: .25rem; }

/* ---------- Waitlist (mono input field; Section 5 conventions) ---------- */
.waitlist { display: flex; flex-wrap: wrap; gap: .6rem; align-items: stretch; margin-top: 2rem; max-width: 540px; }
.waitlist__field {
  position: relative; flex: 1 1 280px;
  border: 1px solid var(--g-struct); background: var(--g-draft);
}
.waitlist__field:focus-within { background: var(--g-func); }            /* snap: active vector */
.waitlist__label {
  position: absolute; top: 6px; left: 12px;
  font-family: var(--mono); font-size: .56rem; letter-spacing: .1em;
  color: var(--g-sub); text-transform: uppercase;
}
.waitlist__field:focus-within .waitlist__label { color: var(--g-struct); }
.waitlist__input {
  width: 100%; background: transparent; border: 0; outline: 0;
  color: var(--g-struct); font-family: var(--mono); font-size: .95rem;
  padding: 1.15rem .9rem .55rem;
}
.waitlist__input::placeholder { color: var(--g-sub); }
.waitlist__btn { flex: 0 0 auto; }
.waitlist__msg {
  flex: 1 0 100%; font-family: var(--mono); font-size: .8rem;
  min-height: 1.2em; color: var(--g-struct); margin-top: .2rem;
}
/* Rule 5 System Exceptions: #808080 bg, #F2F2F2 mono text, bracketed tag */
.waitlist.is-error .waitlist__field { border-color: var(--g-conflict); }
.waitlist.is-error .waitlist__msg { background: var(--g-conflict); color: var(--g-draft); padding: .3rem .5rem; }
.waitlist.is-success .waitlist__field { border-color: var(--g-struct); }

/* ---------- Hero schematic (terminal / pipeline window — mono) ---------- */
.hero__visual { position: relative; }
.schematic { position: relative; z-index: 1; border: 1px solid var(--g-struct); background: var(--g-draft); }
.schematic__head {
  display: flex; align-items: center; gap: .55rem;
  padding: .55rem .9rem; border-bottom: 1px solid var(--g-struct);
  background: var(--g-struct); color: var(--g-draft);
  font-family: var(--mono); font-size: .72rem;
}
.dot { width: 9px; height: 9px; background: var(--g-func); }
.schematic__body { padding: clamp(1rem, 2vw, 1.5rem); display: grid; gap: .85rem; }

.panel-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 6px; }
.panel-grid .node {
  aspect-ratio: 1; background: var(--g-func); border: 1px solid var(--g-arch);
}
.panel-grid .node.live { background: var(--g-struct); border-color: var(--g-struct); }   /* binary snap */

.route, .synth {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  font-family: var(--mono); font-size: .68rem; color: var(--g-sub); padding: .4rem .1rem;
}
.route__tag, .synth__tag { color: var(--g-struct); font-weight: 700; letter-spacing: .06em; }
.route__lines { width: 100%; height: 22px; }
.ln { fill: none; stroke-width: 1; }
.ln--cyan { stroke: var(--g-struct); }
.ln--steel { stroke: var(--g-sub); }

.brief-chip {
  display: flex; align-items: center; gap: .55rem;
  border: 1px solid var(--g-struct); padding: .55rem .8rem;
  font-family: var(--mono); font-size: .74rem; color: var(--g-struct);
}
.brief-chip__icon { display: inline-flex; }
.brief-chip__flag {
  margin-left: auto; font-family: var(--mono); font-size: .6rem; letter-spacing: .1em;
  background: var(--g-struct); color: var(--g-draft); padding: .15rem .4rem; text-transform: uppercase; font-weight: 700;
}
.visual__caption { text-align: center; margin-top: .8rem; font-family: var(--mono); font-size: .72rem; color: var(--g-sub); letter-spacing: .06em; }

/* =========================================================
   ETHOS  (minimal framing — Rule 4.3)
   ========================================================= */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); }
.principle { padding-top: 1.2rem; border-top: 1px solid var(--g-struct); }
.principle__num { font-family: var(--mono); color: var(--g-sub); font-size: .76rem; font-weight: 500; letter-spacing: .1em; margin-bottom: 1rem; }
.principle h3 { font-family: var(--serif); font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: .7rem; }
.principle p { color: var(--g-arch); font-size: 1rem; }
.ethos__close {
  margin-top: clamp(2rem, 4vw, 3rem); padding-top: 1.5rem; border-top: 1px solid var(--g-struct);
  max-width: 80ch; color: var(--g-struct); font-size: 1.1rem; font-style: italic;
}
.tag {
  display: inline-block; font-family: var(--mono); font-size: .64rem; font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase;
  border: 1px solid var(--g-sub); color: var(--g-sub); padding: .12rem .5rem; margin-right: .6rem;
  font-style: normal; vertical-align: 2px;
}

/* =========================================================
   WORKFLOW
   ========================================================= */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1.25rem, 2vw, 1.75rem); }
.step { padding-top: 1.2rem; border-top: 1px solid var(--g-struct); }
.step__top { display: flex; align-items: center; gap: .6rem; margin-bottom: 1.1rem; }
.step__n { font-family: var(--mono); font-weight: 700; font-size: 1.1rem; color: var(--g-struct); }
.step__conn { flex: 1; height: 1px; background: var(--g-func); }
.step h3 { font-family: var(--serif); font-size: 1.18rem; font-weight: 700; margin-bottom: .6rem; }
.step p { color: var(--g-arch); font-size: .97rem; }
.step em { font-style: italic; color: var(--g-struct); }
.step__io { display: block; margin-top: 1.1rem; font-family: var(--mono); font-size: .68rem; color: var(--g-sub); }
.pill {
  display: inline-block; border: 1px solid var(--g-sub); padding: .08rem .4rem;
  margin-right: .4rem; font-size: .6rem; letter-spacing: .08em; text-transform: uppercase; color: var(--g-sub);
}
.pill--cyan { border-color: var(--g-struct); color: var(--g-struct); }
.step--final { border-top-color: var(--g-struct); border-top-width: 2px; }

/* =========================================================
   ENGINE (under the hood)
   ========================================================= */
.engine .section__head, .engine__cols, .engine__note { position: relative; z-index: 1; }
.engine__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--g-struct); }
.engine__col { padding: clamp(1.4rem, 2.5vw, 2rem) clamp(1.5rem, 3vw, 2.5rem) 0; }
.engine__col + .engine__col { border-left: 1px solid var(--g-struct); }
.engine__col--closed { background: var(--g-draft); }
.engine__col-h {
  display: flex; align-items: center; gap: .7rem;
  font-family: var(--serif); font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em;
  color: var(--g-struct); margin-bottom: 1.3rem;
}
.engine__sign {
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; border: 1px solid var(--g-struct);
  font-family: var(--mono); font-weight: 700; color: var(--g-struct); flex: 0 0 auto;
}
.engine__sign--no { color: var(--g-conflict); border-color: var(--g-conflict); }
.engine__list { display: grid; gap: .9rem; }
.engine__list li { color: var(--g-arch); font-size: 1rem; padding-left: 1.3rem; position: relative; }
.engine__list li::before { content: "›"; position: absolute; left: 0; top: -2px; font-family: var(--mono); color: var(--g-struct); font-weight: 700; }
.engine__col--closed .engine__list li { color: var(--g-sub); }
.engine__col--closed .engine__list li::before { color: var(--g-conflict); content: "·"; font-size: 1.3em; top: -5px; }
.engine__note { margin-top: clamp(1.4rem, 2.5vw, 2rem); font-family: var(--mono); font-size: .78rem; color: var(--g-sub); letter-spacing: .03em; }

/* =========================================================
   PROOF
   ========================================================= */
.proof__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); }
.proof__card { padding-top: 1.2rem; border-top: 1px solid var(--g-struct); }
.proof__num { font-family: var(--mono); color: var(--g-sub); font-size: .76rem; font-weight: 500; letter-spacing: .1em; margin-bottom: 1rem; }
.proof__card h3 { font-family: var(--serif); font-size: 1.18rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: .7rem; }
.proof__card p { color: var(--g-arch); font-size: .98rem; }

/* =========================================================
   DELIVERABLE (the brief — drafting artifact)
   ========================================================= */
.deliverable { background: var(--g-draft); }
.deliverable__grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.deliverable__lede { color: var(--g-arch); font-size: 1.08rem; margin-top: 1rem; max-width: 46ch; }
.deliverable__list { margin-top: 1.6rem; display: grid; gap: .5rem; font-family: var(--mono); font-size: .82rem; color: var(--g-sub); }
.deliverable__list li { display: flex; gap: .6rem; }
.dash { color: var(--g-struct); }

.brief-tabs {
  display: flex; gap: 0; margin-bottom: -1px; position: relative; z-index: 2;
  overflow-x: auto;
}
.brief-tab {
  flex: 1 1 auto; text-align: center;
  font-family: var(--mono); font-size: .68rem; font-weight: 500; letter-spacing: .06em;
  padding: .55rem .75rem; border: 1px solid var(--g-struct);
  background: var(--g-draft); color: var(--g-sub);
  cursor: pointer; white-space: nowrap;
}
.brief-tab + .brief-tab { border-left: 0; }
.brief-tab:hover, .brief-tab:focus-visible { background: var(--g-func); color: var(--g-struct); outline: none; }
.brief-tab.is-active {
  background: var(--g-struct); color: var(--g-draft); font-weight: 700;
}

.paper { border: 1px solid var(--g-struct); background: var(--g-draft); }
.paper__bar { display: flex; justify-content: space-between; padding: .55rem .9rem; border-bottom: 1px solid var(--g-struct); font-family: var(--mono); font-size: .68rem; color: var(--g-sub); }
.paper__body { padding: clamp(1.2rem, 2.5vw, 1.8rem); }
.paper__kicker { font-family: var(--mono); font-size: .6rem; letter-spacing: .12em; color: var(--g-sub); text-transform: uppercase; }
.paper__h { font-family: var(--serif); font-size: 1.32rem; font-weight: 700; color: var(--g-struct); margin: .5rem 0 1rem; letter-spacing: -0.01em; }
.paper__chart { border-top: 1px solid var(--g-func); border-bottom: 1px solid var(--g-func); padding: 1rem 0; }
.paper__chart svg { width: 100%; height: 120px; }
.gridln { stroke: var(--g-func); stroke-width: 1; }
.curve { fill: none; stroke: var(--g-struct); stroke-width: 2; }
.dots circle { fill: var(--g-struct); }
.curve--steel { stroke: var(--g-sub); stroke-dasharray: 3 3; }
.paper__legend { display: flex; gap: 1.2rem; margin-top: .6rem; font-family: var(--mono); font-size: .64rem; color: var(--g-sub); }
.sw { display: inline-block; width: 14px; height: 2px; margin-right: .35rem; vertical-align: 3px; }
.sw--cyan { background: var(--g-struct); }
.sw--steel { background: var(--g-sub); }
.paper__verdict { margin-top: 1.1rem; }
.paper__verdict p { color: var(--g-arch); font-size: .95rem; margin-top: .3rem; }

/* =========================================================
   CTA  (dark inversion — structural surface)
   ========================================================= */
.cta { background: var(--g-struct); color: var(--g-draft); border-top: none; }
.cta__inner { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; text-align: center; }
.cta__wordmark { font-family: var(--mono); font-weight: 500; font-size: .72rem; letter-spacing: .18em; text-transform: uppercase; color: var(--g-func); margin-bottom: 1.4rem; }
.cta__quote { font-family: var(--serif); font-weight: 600; font-size: clamp(1.4rem, 1rem + 2vw, 2.3rem); line-height: 1.3; letter-spacing: -0.01em; max-width: 24ch; color: var(--g-draft); }
.cta__quote .hl-crim { background: var(--g-conflict); color: var(--g-draft); padding: 0 .18em; }
.cta__quote .hl-cyan { color: var(--g-func); border-bottom: 1px solid var(--g-func); }
.waitlist--cta { justify-content: center; margin-top: 2.2rem; }
.waitlist--cta .waitlist__field { background: var(--g-struct); border-color: var(--g-func); }
.waitlist--cta .waitlist__label { color: var(--g-func); }
.waitlist--cta .waitlist__input { color: var(--g-draft); }
.waitlist--cta .waitlist__input::placeholder { color: var(--g-func); }
.waitlist--cta .waitlist__field:focus-within { background: var(--g-arch); border-color: var(--g-draft); }
.waitlist--cta .waitlist__msg { color: var(--g-draft); }
.waitlist--cta.is-error .waitlist__msg { background: var(--g-conflict); color: var(--g-draft); }
.waitlist--cta .btn--solid { background: var(--g-draft); color: var(--g-struct); border-color: var(--g-draft); }
.waitlist--cta .btn--solid:hover, .waitlist--cta .btn--solid:focus-visible { background: var(--g-func); color: var(--g-struct); }
.cta__fine { margin-top: 1.6rem; font-family: var(--mono); font-size: .72rem; color: var(--g-func); letter-spacing: .04em; }

/* =========================================================
   FOOTER
   ========================================================= */
.footer { border-top: 1px solid var(--g-struct); padding-block: clamp(2.5rem, 5vw, 3.5rem) 2rem; background: var(--g-draft); }
.footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; align-items: start; }
.footer__tag { color: var(--g-arch); font-size: .95rem; margin-top: .9rem; max-width: 30ch; font-style: italic; }
.footer__nav { display: flex; flex-direction: column; gap: .6rem; }
.footer__nav a { font-family: var(--mono); font-size: .76rem; color: var(--g-sub); text-transform: uppercase; letter-spacing: .08em; }
.footer__nav a:hover { color: var(--g-struct); }
.footer__meta { text-align: right; font-family: var(--mono); }
.footer__meta p { color: var(--g-sub); font-size: .74rem; }
.footer__links { margin-top: .6rem; }
.footer__links a { color: var(--g-sub); }
.footer__links a:hover { color: var(--g-struct); }
.footer__links span { color: var(--g-func); margin: 0 .3rem; }

/* ---------- Scroll reveal ----------
   Entrance reveals (user-requested "flowing" scroll). Scoped + subtle.
   Interactive state changes stay binary snaps (Rule 4.2).
   `.js` gates the hidden state so no-JS clients see all content. */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .45s cubic-bezier(.2,.6,.2,1), transform .45s cubic-bezier(.2,.6,.2,1); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero__visual { order: 2; max-width: 520px; }
  .engine__cols { grid-template-columns: 1fr; }
  .engine__col + .engine__col { border-left: 0; border-top: 1px solid var(--g-struct); }
  .deliverable__grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .principles { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .proof__grid { grid-template-columns: 1fr; max-width: 460px; margin-inline: auto; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__meta { text-align: left; }
}

@media (max-width: 640px) {
  .hero__stats { grid-template-columns: 1fr 1fr; gap: 1.4rem; }
  .steps { grid-template-columns: 1fr; }
  .waitlist { flex-direction: column; align-items: stretch; }
  .waitlist__btn { justify-content: center; }
  .step__conn { display: none; }
  .route, .synth { flex-direction: column; align-items: flex-start; gap: .2rem; }
}

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