/* ==========================================================================
   XYNTAQX — main stylesheet
   ========================================================================== */

:root {
  /* Palette */
  --ink: #12121e;
  --ink-2: #1d1b30;
  --text: #2a2938;
  --muted: #5d5a72;
  --paper: #f7f6fa;
  --paper-2: #efedf5;
  --surface: #fdfcff;
  --rule: #dddae7;
  --rule-strong: #b5b0c8;
  --accent: #5a3fd8;
  --accent-ink: #5a3fd8;
  --accent-light: #8a72ff;
  --on-ink: #f4f3f9;
  --on-ink-muted: #a8a2c0;
  --rule-on-ink: rgba(244, 243, 249, 0.14);
  --error: #a3392b;

  /* Type */
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  /* Layout */
  --container: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --section-y: clamp(80px, 10vw, 136px);
  --header-h: 76px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

h1 em, h2 em { font-style: italic; font-weight: 400; color: var(--accent-ink); }

p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

::selection { background: var(--ink); color: var(--on-ink); }

[id] { scroll-margin-top: calc(var(--header-h) + 16px); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--on-ink);
  text-decoration: none;
  transition: top 0.2s;
}
.skip-link:focus { top: 12px; }

/* --------------------------------------------------------------------------
   Buttons & links
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.25s, color 0.25s, border-color 0.25s;
}

.btn-primary { background: var(--ink); color: var(--on-ink); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

.btn-small { padding: 10px 20px; font-size: 0.88rem; }

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-weight: 500;
  font-size: 0.98rem;
  color: var(--ink);
  text-decoration: none;
  background: linear-gradient(var(--accent), var(--accent)) left bottom / 100% 1px no-repeat;
  transition: background-size 0.3s var(--ease);
}
.btn-link span { transition: transform 0.3s var(--ease); }
.btn-link:hover span { transform: translateX(4px); }

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 246, 250, 0.92);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
.site-header.is-scrolled { border-bottom-color: var(--rule); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}
.brand-logo { width: auto; height: 26px; }

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 34px;
}
.primary-nav a:not(.btn) {
  position: relative;
  padding: 6px 0;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}
.primary-nav a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.primary-nav a:not(.btn):hover,
.primary-nav a:not(.btn)[aria-current] { color: var(--ink); }
.primary-nav a:not(.btn):hover::after,
.primary-nav a:not(.btn)[aria-current]::after { transform: scaleX(1); }
.nav-cta { margin-left: 6px; }

.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  margin-right: -10px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}
.nav-toggle span {
  position: absolute;
  left: 11px;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}
.nav-toggle span:nth-child(1) { top: 15px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 27px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   Shared section pieces
   -------------------------------------------------------------------------- */

.eyebrow,
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.eyebrow::before {
  content: "";
  width: 36px;
  height: 1px;
  background: var(--accent);
}

.section-label { color: var(--muted); }
.section-label span {
  display: inline-block;
  min-width: 2.2em;
  padding-right: 12px;
  border-right: 1px solid var(--rule-strong);
  color: var(--accent-ink);
}
.eyebrow.on-dark { color: var(--accent-light); }

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2.4fr);
  gap: 40px clamp(32px, 5vw, 72px);
  align-items: start;
}
.split > .section-label { padding-top: 0.6em; }

.section-head { margin-bottom: clamp(52px, 6vw, 80px); }
.section-head h2 {
  max-width: 17em;
  font-size: clamp(2.1rem, 4vw, 3.3rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
}
.section-intro {
  max-width: 36em;
  margin-top: 22px;
  font-size: 1.06rem;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  padding-top: clamp(48px, 8vw, 112px);
  padding-bottom: clamp(56px, 7vw, 96px);
  border-bottom: 1px solid var(--rule);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(48px, 6vw, 96px);
  align-items: center;
}

.hero h1 {
  margin-top: 26px;
  font-size: clamp(2.7rem, 6vw, 4.9rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
}
.hero h1 em { display: inline-block; }

.lead {
  max-width: 33em;
  margin-top: 30px;
  font-size: clamp(1.05rem, 1.4vw, 1.18rem);
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 32px;
  margin-top: 42px;
}

.hero-panel {
  position: relative;
  isolation: isolate;
  padding: 0 18px 0 0;
}
.hero-panel::before {
  content: "";
  position: absolute;
  inset: 22px 0 46px 22px;
  border: 1px solid var(--accent);
  z-index: -1;
}

.code-card {
  overflow: hidden;
  background: var(--ink);
  color: var(--on-ink);
  border-radius: 3px;
  box-shadow: 0 40px 70px -40px rgba(18, 18, 30, 0.55);
}
.code-card-head {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--rule-on-ink);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--on-ink-muted);
}
.dots { display: inline-flex; gap: 7px; }
.dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(244, 243, 249, 0.2);
}
.dots i:first-child { background: var(--accent); }

.code-card pre {
  margin: 0;
  padding: 28px 26px 32px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.9;
  color: #e6e3f2;
}
.tok-c { color: #8a86a3; font-style: italic; }
.tok-k { color: var(--accent-light); }
.tok-s { color: #c9bdff; }

.hero-panel figcaption {
  margin-top: 26px;
  font-family: var(--serif);
  font-size: 0.98rem;
  font-style: italic;
  color: var(--muted);
  text-align: right;
}

.hero-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(64px, 8vw, 104px);
  border-top: 1px solid var(--ink);
}
.hero-strip li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 22px 24px;
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--ink);
}
.hero-strip li:first-child { padding-left: 0; }
.hero-strip li + li { border-left: 1px solid var(--rule); }
.hero-strip span {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent-ink);
}

/* --------------------------------------------------------------------------
   About
   -------------------------------------------------------------------------- */

.statement {
  max-width: 24em;
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.2vw, 2.55rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.statement em { font-style: italic; color: var(--accent-ink); }

.about-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px 48px;
  max-width: 52em;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   Services
   -------------------------------------------------------------------------- */

.section-alt { background: var(--paper-2); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--rule);
}

.service {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 40px 36px 40px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  transition: background-color 0.35s;
}
.service::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s var(--ease);
}
.service:hover { background: var(--surface); }
.service:hover::before { transform: scaleX(1); }

.service-num {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--accent-ink);
}
.service h3 {
  margin: 20px 0 14px;
  font-size: 1.6rem;
}
.service > p:not(.service-num) {
  font-size: 0.98rem;
  color: var(--muted);
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: auto;
  padding-top: 26px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   Approach
   -------------------------------------------------------------------------- */

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.step-marker {
  display: flex;
  align-items: center;
  margin-bottom: 30px;
}
.step-marker::after {
  content: "";
  flex: 1;
  height: 1px;
  margin: 0 14px;
  background: var(--rule-strong);
}
.step:last-child .step-marker::after {
  background: linear-gradient(90deg, var(--rule-strong), transparent);
}

.step-num {
  display: grid;
  place-items: center;
  flex: none;
  width: 58px;
  height: 58px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--surface);
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}
.step:hover .step-num { background: var(--accent); border-color: var(--accent); color: #fff; }

.step-body { padding-right: 28px; }
.step h3 {
  margin-bottom: 12px;
  font-size: 1.45rem;
}
.step p {
  font-size: 0.96rem;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   Principles (dark band)
   -------------------------------------------------------------------------- */

.principles {
  position: relative;
  overflow: hidden;
  padding-block: var(--section-y);
  background: var(--ink);
  color: var(--on-ink);
}

.watermark {
  position: absolute;
  right: -4%;
  top: 50%;
  width: min(54vw, 640px);
  transform: translateY(-50%);
  fill: none;
  stroke: rgba(138, 114, 255, 0.07);
  stroke-width: 28.6;
  pointer-events: none;
}

.principles-quote {
  max-width: 19em;
  margin-top: 36px;
  font-size: clamp(2.1rem, 4.6vw, 3.7rem);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--on-ink);
}
.principles-quote em { color: var(--accent-light); }

.principles-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(64px, 8vw, 96px);
  border-top: 1px solid var(--rule-on-ink);
}
.principle { padding: 34px 32px 0 0; }
.principle + .principle {
  padding-left: 32px;
  border-left: 1px solid var(--rule-on-ink);
}
.principle h3 {
  margin-bottom: 12px;
  font-size: 1.38rem;
  color: var(--on-ink);
}
.principle p {
  font-size: 0.95rem;
  color: var(--on-ink-muted);
}

/* --------------------------------------------------------------------------
   Expertise
   -------------------------------------------------------------------------- */

.ledger { border-top: 3px double var(--ink); }

.ledger-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: 16px clamp(32px, 5vw, 72px);
  align-items: center;
  padding: 30px 0;
  border-bottom: 1px solid var(--rule);
}
.ledger-row h2 { font-size: 1.5rem; }
.ledger-row div > p {
  margin-top: 6px;
  font-size: 0.95rem;
  color: var(--muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chips li {
  padding: 7px 14px;
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}
.chips li:hover { border-color: var(--accent); }

/* --------------------------------------------------------------------------
   Selected work
   -------------------------------------------------------------------------- */

.case {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 48px clamp(40px, 6vw, 88px);
  align-items: start;
  padding-top: clamp(40px, 5vw, 56px);
  border-top: 1px solid var(--ink);
}

.case-kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.case-title {
  margin: 18px 0 24px;
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
}
.case-title span {
  display: block;
  margin-top: 10px;
  font-size: 0.5em;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}
.case-copy > p:not(.case-kicker):not(.case-stack) { color: var(--muted); }
.case-copy > p + p { margin-top: 16px; }

.case-controls { margin-top: 36px; }
.case-controls h3 {
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}
.case-controls li {
  position: relative;
  padding: 12px 0 12px 26px;
  border-bottom: 1px solid var(--rule);
  font-size: 0.96rem;
}
.case-controls li::before {
  content: "›";
  position: absolute;
  left: 4px;
  top: 9px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
}

.case-stack {
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.case-stack span { display: block; margin-top: 6px; color: var(--ink); }

.case-panel {
  padding: clamp(28px, 4vw, 44px);
  background: var(--ink);
  color: var(--on-ink);
  border-radius: 3px;
  box-shadow: 0 40px 70px -40px rgba(18, 18, 30, 0.55);
}
.case-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule-on-ink);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-ink-muted);
}
.case-panel-head strong { font-weight: 500; color: var(--accent-light); }

.case-modules {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
}
.case-modules li {
  padding: 20px 0;
  border-bottom: 1px solid var(--rule-on-ink);
}
.case-modules li:nth-last-child(-n + 2) { padding-bottom: 0; border-bottom: 0; }
.case-modules h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 1.16rem;
  color: var(--on-ink);
}
.case-modules h3 span {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--accent-light);
}
.case-modules p {
  margin-top: 6px;
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--on-ink-muted);
}

.case-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(48px, 6vw, 72px);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.case-stats div { padding: 28px 28px 30px; }
.case-stats div:first-child { padding-left: 0; }
.case-stats div + div { border-left: 1px solid var(--rule); }
.case-stats strong {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.case-stats span {
  display: block;
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   Engagement
   -------------------------------------------------------------------------- */

.models {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.model {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 40px 36px 34px;
  background: var(--surface);
  border: 1px solid var(--rule);
  transition: border-color 0.3s, transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.model:hover {
  border-color: var(--rule-strong);
  transform: translateY(-4px);
  box-shadow: 0 24px 40px -30px rgba(18, 18, 30, 0.35);
}
.model-featured {
  border-color: var(--ink);
  box-shadow: inset 0 3px 0 var(--accent);
}
.model-featured:hover {
  border-color: var(--ink);
  box-shadow: inset 0 3px 0 var(--accent), 0 24px 40px -30px rgba(18, 18, 30, 0.35);
}

.model-kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.model h3 {
  margin: 16px 0 14px;
  font-size: 1.7rem;
}
.model > p:not(.model-kicker):not(.model-meta) {
  font-size: 0.98rem;
  color: var(--muted);
}
.model-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: auto;
  padding-top: 30px;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--ink);
}
.model-meta::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 20px;
  background: var(--rule);
}
.model-meta span {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-style: normal;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 56px clamp(40px, 7vw, 112px);
  align-items: start;
}

.contact-copy h2 {
  margin-top: 28px;
  font-size: clamp(2.3rem, 4.6vw, 3.7rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.contact-details {
  margin-top: 48px;
  border-top: 1px solid var(--ink);
}
.contact-details div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
}
.contact-details dt {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact-details dd { color: var(--ink); }
.contact-details a {
  font-family: var(--serif);
  font-size: 1.2rem;
  text-decoration: none;
  background: linear-gradient(var(--accent), var(--accent)) left bottom / 100% 1px no-repeat;
}

.contact-form {
  padding: clamp(28px, 4vw, 52px);
  background: var(--surface);
  border: 1px solid var(--rule);
  box-shadow: 0 30px 60px -45px rgba(18, 18, 30, 0.35);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 26px;
}
.field label {
  font-size: 0.84rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.field label span { color: var(--accent-ink); }

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 10px 0;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-strong);
  border-radius: 0;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.55;
}
.field select {
  -webkit-appearance: none;
  appearance: none;
  padding-right: 28px;
  cursor: pointer;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%2312121e' stroke-width='1.4'/%3E%3C/svg%3E") right 4px center / 12px 8px no-repeat;
}
.field ::placeholder { color: #9b98ab; }

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-bottom-color: var(--ink);
  box-shadow: 0 1px 0 var(--ink);
}

.field-error {
  display: none;
  font-size: 0.8rem;
  color: var(--error);
}
.field.has-error input,
.field.has-error textarea {
  border-bottom-color: var(--error);
  box-shadow: 0 1px 0 var(--error);
}
.field.has-error .field-error { display: block; }

.form-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: 8px;
}
.form-note { font-size: 0.84rem; color: var(--muted); }

.form-status:empty { display: none; }
.form-status {
  margin-top: 24px;
  padding: 14px 18px;
  font-size: 0.94rem;
  background: var(--paper);
  border-left: 2px solid var(--accent);
}
.form-status.is-error { border-left-color: var(--error); color: var(--error); }
.form-status a { color: var(--ink); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  padding-top: clamp(72px, 9vw, 104px);
  background: var(--ink);
  box-shadow: inset 0 1px 0 var(--rule-on-ink);
  color: var(--on-ink-muted);
  font-size: 0.95rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) repeat(3, minmax(0, 1fr));
  gap: 48px;
  padding-bottom: 72px;
}

.site-footer .brand-logo { height: 28px; }
.footer-brand p { max-width: 26em; margin-top: 22px; }
.footer-brand .footer-tagline {
  margin-top: 18px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--on-ink-muted);
}

.footer-col h2 {
  margin-bottom: 20px;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-ink);
}
.footer-col li + li { margin-top: 10px; }
.site-footer a {
  text-decoration: none;
  transition: color 0.2s;
}
.footer-col a:hover,
.footer-bottom a:hover { color: var(--on-ink); }
.footer-cta { color: var(--accent-light); }

.footer-bottom {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 26px;
  padding-bottom: 32px;
  font-size: 0.85rem;
}
.footer-bottom::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: 1px;
  background: var(--rule-on-ink);
}

/* --------------------------------------------------------------------------
   Inner page header
   -------------------------------------------------------------------------- */

.page-hero {
  padding-top: clamp(56px, 8vw, 104px);
  padding-bottom: clamp(56px, 7vw, 88px);
  border-bottom: 1px solid var(--rule);
}
.page-hero h1 {
  max-width: 15em;
  font-size: clamp(2.5rem, 5.2vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
}
.page-hero .section-intro {
  margin-top: 26px;
  font-size: clamp(1.05rem, 1.4vw, 1.18rem);
}

.section-more { margin-top: clamp(36px, 5vw, 52px); }

/* --------------------------------------------------------------------------
   Home: services index
   -------------------------------------------------------------------------- */

.index-list { border-top: 1px solid var(--ink); }
.index-list a {
  display: grid;
  grid-template-columns: 56px minmax(0, 1.1fr) minmax(0, 1fr) 32px;
  gap: 8px 24px;
  align-items: baseline;
  padding: 26px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transition: background-color 0.3s;
}
.index-list a:hover { background: var(--surface); }
.index-num {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-style: italic;
  color: var(--accent-ink);
}
.index-title {
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  line-height: 1.2;
  color: var(--ink);
}
.index-desc { font-size: 0.96rem; color: var(--muted); }
.index-arrow {
  justify-self: end;
  color: var(--accent);
  transition: transform 0.3s var(--ease);
}
.index-list a:hover .index-arrow { transform: translateX(6px); }

/* --------------------------------------------------------------------------
   Home: featured work
   -------------------------------------------------------------------------- */

.feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px clamp(40px, 6vw, 88px);
  align-items: center;
}

.feature-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 44px);
  background: var(--ink);
  border-radius: 3px;
  box-shadow: 0 40px 70px -40px rgba(18, 18, 30, 0.55);
}
.feature-panel .watermark { right: -18%; width: 80%; }
.feature-panel > :not(.watermark),
.principles .container { position: relative; }
.feature-stats div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule-on-ink);
}
.feature-stats div:last-child { padding-bottom: 0; border-bottom: 0; }
.feature-stats strong {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 3.6vw, 2.9rem);
  font-weight: 400;
  line-height: 1;
  color: var(--on-ink);
}
.feature-stats span { font-size: 0.92rem; color: var(--on-ink-muted); }

.feature-copy h3 {
  margin: 18px 0 20px;
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
}
.feature-copy h3 span {
  display: block;
  margin-top: 10px;
  font-size: 0.5em;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}
.feature-copy > p:not(.case-kicker) { color: var(--muted); }
.feature-copy .service-tags { margin-top: 24px; padding-top: 0; }
.feature-copy .btn-link { margin-top: 32px; }

/* --------------------------------------------------------------------------
   Home: approach at a glance
   -------------------------------------------------------------------------- */

.steps-compact .step-marker { margin-bottom: 20px; }
.steps-compact .step-body { padding-bottom: 0; }

/* --------------------------------------------------------------------------
   About: explore links
   -------------------------------------------------------------------------- */

.explore-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}
.explore-card {
  display: flex;
  flex-direction: column;
  padding: 32px 28px 28px;
  background: var(--surface);
  border: 1px solid var(--rule);
  text-decoration: none;
  transition: border-color 0.3s, transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.explore-card:hover {
  border-color: var(--ink);
  transform: translateY(-4px);
  box-shadow: 0 24px 40px -30px rgba(18, 18, 30, 0.35);
}
.explore-card h3 { margin: 14px 0 10px; font-size: 1.5rem; }
.explore-card p:not(.model-kicker) { font-size: 0.95rem; color: var(--muted); }
.explore-card .index-arrow { margin-top: auto; padding-top: 24px; justify-self: auto; }
.explore-card:hover .index-arrow { transform: translateX(6px); }

/* --------------------------------------------------------------------------
   Call-to-action band
   -------------------------------------------------------------------------- */

.cta-band {
  position: relative;
  overflow: hidden;
  padding-block: clamp(72px, 9vw, 120px);
  background: var(--ink);
  color: var(--on-ink);
}
.cta-inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 36px 48px;
}
.cta-band h2 {
  max-width: 13em;
  margin-top: 24px;
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--on-ink);
}
.cta-band h2 em { color: var(--accent-light); }
.cta-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
}
.btn-light { background: var(--on-ink); color: var(--ink); border-color: var(--on-ink); }
.btn-light:hover { background: var(--accent-light); border-color: var(--accent-light); color: var(--ink); }
.cta-email {
  padding-bottom: 2px;
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--on-ink-muted);
  text-decoration: none;
  background: linear-gradient(var(--accent-light), var(--accent-light)) left bottom / 100% 1px no-repeat;
  transition: color 0.2s;
}
.cta-email:hover { color: var(--on-ink); }

/* --------------------------------------------------------------------------
   Contact: what happens next
   -------------------------------------------------------------------------- */

.next-steps { margin-top: 48px; }
.next-steps h2 {
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.next-steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
}
.next-steps li > span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--ink);
}
.next-steps strong { font-weight: 500; color: var(--ink); }

/* --------------------------------------------------------------------------
   Scroll reveal (only when JS is running)
   -------------------------------------------------------------------------- */

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: calc(var(--d, 0) * 90ms);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

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

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1100px) {
  .primary-nav ul { gap: 26px; }
  .services-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .principles-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .principle:nth-child(odd) { padding-left: 0; border-left: 0; }
  .principle:nth-child(n + 3) { margin-top: 34px; border-top: 1px solid var(--rule-on-ink); }
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }

  /* Process becomes a vertical timeline */
  .steps { grid-template-columns: minmax(0, 1fr); max-width: 760px; }
  .step {
    display: grid;
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 28px;
  }
  .step-marker { flex-direction: column; margin: 0; }
  .step-marker::after { width: 1px; height: auto; margin: 10px 0; }
  .step:last-child .step-marker::after { display: none; }
  .step-body { padding: 12px 0 44px; }
}

@media (max-width: 900px) {
  :root { --header-h: 68px; }

  .nav-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 24px 40px -30px rgba(18, 18, 30, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s, transform 0.3s var(--ease), visibility 0s 0.3s;
  }
  .primary-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: opacity 0.25s, transform 0.3s var(--ease);
  }
  .primary-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
  }
  .primary-nav li { border-bottom: 1px solid var(--rule); }
  .primary-nav a:not(.btn) {
    display: block;
    padding: 16px 0;
    font-family: var(--serif);
    font-size: 1.3rem;
  }
  .primary-nav a:not(.btn)::after { display: none; }
  .primary-nav a:not(.btn)[aria-current] { color: var(--accent-ink); }
  .nav-cta { margin: 20px 0 0; border-bottom: 0 !important; }
  .nav-cta .btn { width: 100%; padding: 15px 20px; font-size: 0.95rem; }

  .hero-grid,
  .split,
  .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .split { gap: 24px; }
  .split > .section-label { padding-top: 0; }
  .hero-panel { max-width: 560px; }

  .hero-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-strip li:nth-child(odd) { padding-left: 0; border-left: 0; }
  .hero-strip li:nth-child(n + 3) { border-top: 1px solid var(--rule); }

  .case { grid-template-columns: minmax(0, 1fr); }
  .case-copy { max-width: 640px; }
  .case-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-stats div:nth-child(odd) { padding-left: 0; border-left: 0; }
  .case-stats div:nth-child(n + 3) { border-top: 1px solid var(--rule); }

  .ledger-row { grid-template-columns: minmax(0, 1fr); }
  .models { grid-template-columns: minmax(0, 1fr); max-width: 620px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .brand-logo { height: 22px; }

  .hero-actions .btn { width: 100%; }
  .hero-panel { padding-right: 12px; }
  .hero-panel::before { inset: 14px 0 44px 14px; }
  .code-card pre { padding: 22px 18px 26px; font-size: 0.8rem; }

  .hero-strip li { padding: 18px 14px; font-size: 1.05rem; }

  .about-cols { grid-template-columns: minmax(0, 1fr); gap: 20px; }

  .services-grid { grid-template-columns: minmax(0, 1fr); }
  .service { padding: 32px 24px; }

  .step { grid-template-columns: 48px minmax(0, 1fr); gap: 20px; }
  .step-num { width: 48px; height: 48px; font-size: 1rem; }
  .step-body { padding-top: 8px; }

  .case-modules { grid-template-columns: minmax(0, 1fr); }
  .case-modules li:nth-last-child(2) { padding-bottom: 20px; border-bottom: 1px solid var(--rule-on-ink); }
  .case-stats div { padding: 22px 16px 24px; }

  .watermark { display: none; }
  .principles-grid { grid-template-columns: minmax(0, 1fr); }
  .principle,
  .principle + .principle { padding: 28px 0 0; border-left: 0; }
  .principle + .principle { margin-top: 28px; border-top: 1px solid var(--rule-on-ink); }

  .model { padding: 32px 26px 28px; }

  .contact-details div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .form-row { grid-template-columns: minmax(0, 1fr); }
  .form-footer .btn { width: 100%; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 24px; }
}

/* Responsive: multi-page components */

@media (max-width: 1100px) {
  .explore-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps-compact .step-body { padding: 12px 0 28px; }
}

@media (max-width: 900px) {
  .feature { grid-template-columns: minmax(0, 1fr); }
  .feature-panel { max-width: 560px; }
  .index-list a { grid-template-columns: 40px minmax(0, 1fr) 24px; }
  .index-desc { grid-column: 2; grid-row: 2; }
  .cta-inner { align-items: flex-start; }
}

@media (max-width: 640px) {
  .explore-grid { grid-template-columns: minmax(0, 1fr); }
  .feature-stats div { grid-template-columns: 88px minmax(0, 1fr); gap: 14px; }
  .index-list a { padding: 20px 0; gap: 6px 14px; }
  .cta-actions, .cta-actions .btn { width: 100%; }
}

.contact-copy > :first-child { margin-top: 0; }