:root {
  --ink: #11110f;
  --paper: #e9e6dc;
  --paper-dim: #b8b4a8;
  --line: #3d3c36;
  --acid: #d7f35b;
  --red: #ff806b;
  --green: #9be28f;
  --max: 1440px;
  --gutter: clamp(1rem, 3vw, 3.5rem);
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-heading: "DM Serif Display", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; }

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: .7rem 1rem;
  background: var(--acid);
  color: var(--ink);
  font-weight: 700;
  font-family: var(--font-body);
}
.skip-link:focus { top: 1rem; }

.site-header {
  min-height: 4.5rem;
  padding: .8rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(17,17,15,.94);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  text-decoration: none;
}

.brand-logo {
  height: 2.2rem;
  width: auto;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--paper);
}

.header-cta {
  font: 700 .75rem/1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  text-decoration: none;
}
.header-cta:hover { color: var(--acid); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.header-nav a {
  font: 600 .82rem/1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
  text-decoration: none;
  color: var(--paper-dim);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--acid);
  border-bottom-color: var(--acid);
}

.hero, .section-frame {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.hero {
  min-height: calc(100vh - 4.5rem);
  display: grid;
  grid-template-columns: 1fr;
  align-content: center;
  padding-top: 0;
  padding-bottom: clamp(4rem, 9vw, 8rem);
  position: relative;
}

.hero-copy {
  max-width: 850px;
}

.eyebrow {
  margin: 0 0 1.4rem;
  color: var(--acid);
  font: 700 .72rem/1 var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 400;
}

h1 {
  font-size: clamp(3.2rem, 7vw, 7.5rem);
  line-height: .91;
  letter-spacing: -.055em;
  max-width: 10.5ch;
}

h1 em {
  color: var(--acid);
  font-style: normal;
}

.hero-lede {
  max-width: 58ch;
  margin: 2rem 0 0;
  color: var(--paper-dim);
  font-size: clamp(1rem, 1.4vw, 1.2rem);
}

.hero-proof {
  margin-top: 3rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: 700px;
}

.hero-proof strong {
  display: block;
  font: 700 1.05rem/1 var(--font-mono);
}

.hero-proof span {
  display: block;
  color: var(--paper-dim);
  margin-top: .4rem;
  font-size: .8rem;
}

.proof-rule {
  width: 1px;
  height: 3rem;
  background: var(--line);
}

.section-frame {
  border-top: 1px solid var(--line);
  padding-block: clamp(4rem, 7vw, 7rem);
  display: grid;
  grid-template-columns: minmax(220px, .65fr) minmax(0, 1.35fr);
  gap: clamp(1rem, 3vw, 4rem);
}

.section-heading h2 {
  font-size: clamp(2.2rem, 4.5vw, 5rem);
  line-height: .96;
  letter-spacing: -.045em;
  max-width: 8ch;
}

.problem-copy > p:first-child {
  margin-top: 0;
  max-width: 58ch;
  color: var(--paper-dim);
}

.cost-table {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
}

.cost-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
}

.cost-row > :not(:first-child) {
  font-family: var(--font-mono);
}

.cost-head {
  color: var(--paper-dim);
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.cost-row strong {
  color: var(--acid);
  font-weight: 400;
}

.cost-row.total {
  padding-block: 1.1rem;
}

.fine-print {
  color: #77766e !important;
  font-size: .78rem;
  margin-top: 1rem;
}

.capability-list {
  grid-column: 2;
  border-top: 1px solid var(--line);
}

.capability {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 2rem;
  padding: 1.7rem 0;
  border-bottom: 1px solid var(--line);
}

.capability-meta {
  display: flex;
  align-self: start;
  color: var(--paper-dim);
  font: 650 .68rem/1.3 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.capability h3 {
  font-size: clamp(1.6rem, 2.3vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.03em;
}

.capability p {
  color: var(--paper-dim);
  max-width: 58ch;
  margin: .8rem 0 1.2rem;
  font-size: .95rem;
}

.code-card {
  display: grid;
  gap: .35rem;
  padding: .75rem 0;
  border-left: 2px solid var(--acid);
  padding-left: .8rem;
}

.code-label {
  color: #77766e;
  font: 600 .65rem/1 var(--font-mono);
  text-transform: uppercase;
}

.code-card code {
  font: .78rem/1.5 var(--font-mono);
  overflow-wrap: anywhere;
}

.timeline {
  grid-column: 2;
  border-top: 1px solid var(--line);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: start;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
}

.timeline-item h3 {
  font: 700 1.05rem/1.2 var(--font-body);
  text-transform: uppercase;
  letter-spacing: .03em;
}

.timeline-item p {
  margin: .4rem 0 0;
  color: var(--paper-dim);
  max-width: 52ch;
}

.timeline-item time {
  color: var(--paper-dim);
  font: .72rem/1 var(--font-mono);
  white-space: nowrap;
}

.timeline-item.active {
  background: rgba(215,243,91,.05);
  margin-inline: -.8rem;
  padding-inline: .8rem;
}

.timeline-item.active h3 {
  color: var(--acid);
}

.model-grid {
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}

.model-statement {
  padding: 1.4rem 1rem 1.2rem 0;
  border-bottom: 1px solid var(--line);
}

.model-statement + .model-statement {
  border-left: 1px solid var(--line);
  padding-left: 1rem;
}

.model-statement h3 {
  margin-top: 1rem;
  font-size: 1.5rem;
  line-height: 1.1;
}

.model-statement p {
  color: var(--paper-dim);
  font-size: .92rem;
}

.proof-layout {
  grid-column: 2;
}

.stack-flow {
  display: flex;
  flex-direction: column;
  gap: .6rem;
  overflow: hidden;
  width: 100%;
}

.stack-row {
  width: 100%;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 4%, black 96%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 4%, black 96%, transparent);
}

.stack-track {
  display: flex;
  width: max-content;
  animation: scroll-left 40s linear infinite;
}

.stack-row.reverse .stack-track {
  animation: scroll-right 40s linear infinite;
}

.stack-track span {
  flex-shrink: 0;
  padding: .45rem .7rem;
  margin-right: .5rem;
  border: 1px solid var(--line);
  color: var(--paper);
  font: .7rem/1 var(--font-mono);
  white-space: nowrap;
}

@keyframes scroll-left {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@keyframes scroll-right {
  from { transform: translateX(-50%); }
  to { transform: translateX(0); }
}

.case-study-list {
  grid-column: 2;
  display: grid;
  gap: 1.5rem;
}

.case-study {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: linear-gradient(180deg, rgba(215, 243, 91, .045), transparent 45%);
}

.case-study-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.case-study-tag {
  padding: .3rem .5rem;
  border: 1px solid var(--acid);
  color: var(--acid);
  font: 600 .6rem/1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .05em;
}

.case-study-meta {
  color: var(--paper-dim);
  font: .7rem/1 var(--font-mono);
}

.case-study h3 {
  margin: 0;
  font: 400 clamp(1.6rem, 3vw, 2.4rem)/1.05 var(--font-heading);
  letter-spacing: -.02em;
}

.case-study p {
  margin: 0;
  max-width: 56ch;
  font-size: .95rem;
  line-height: 1.6;
  color: var(--paper);
}

.case-study-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.case-study-metrics > div {
  background: var(--ink);
  padding: clamp(1rem, 2vw, 1.5rem);
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.case-study-metrics strong {
  font: 400 clamp(1.9rem, 4vw, 3rem)/1 var(--font-heading);
  color: var(--acid);
  letter-spacing: -.03em;
}

.case-study-metrics span {
  color: var(--paper-dim);
  font: 600 .65rem/1.3 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.case-study-stack {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.case-study-stack span {
  padding: .3rem .6rem;
  border: 1px solid var(--line);
  color: var(--paper-dim);
  font: .68rem/1 var(--font-mono);
}

.about-content {
  grid-column: 2;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--paper-dim);
  font-size: .95rem;
  margin: 0 0 1.2rem;
  max-width: 60ch;
}

.about-card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 1.2rem;
  align-self: start;
}

.about-avatar {
  display: grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  border: 1px solid var(--acid);
  color: var(--acid);
  font: 700 .9rem/1 var(--font-mono);
  flex-shrink: 0;
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.about-info strong {
  font: 700 .95rem/1.2 var(--font-body);
}

.about-info span {
  color: var(--paper-dim);
  font: .75rem/1.3 var(--font-mono);
}

.faq-list {
  grid-column: 2;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  padding: 1.2rem 0;
  cursor: pointer;
  font: 700 1rem/1.3 var(--font-body);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font: 400 1.4rem/1 var(--font-mono);
  color: var(--acid);
  transition: transform .2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin: 0 0 1.2rem;
  color: var(--paper-dim);
  font-size: .92rem;
  max-width: 60ch;
}

.contact {
  background: var(--acid);
  color: var(--ink);
  border-top: 0;
}

.contact .eyebrow { color: var(--ink); }

.contact-main {
  grid-column: 1;
}

.contact h2 {
  font-size: clamp(3rem, 6vw, 6.5rem);
  line-height: .9;
  letter-spacing: -.055em;
  max-width: 8ch;
}

.contact-main > p:not(.eyebrow) {
  max-width: 55ch;
  margin: 1.5rem 0 2rem;
}

.contact-form {
  max-width: 700px;
}

.contact-form label {
  display: block;
  margin-top: 1rem;
}

.contact-form label span {
  display: block;
  margin-bottom: .4rem;
  font: 700 .7rem/1 var(--font-mono);
  text-transform: uppercase;
}

input, textarea {
  width: 100%;
  border: 1px solid #4d522c;
  background: #eef5bd;
  color: var(--ink);
  padding: .85rem;
  border-radius: 0;
  font: 1rem/1.4 var(--font-body);
}

textarea {
  resize: vertical;
  min-height: 8rem;
}

input:focus, textarea:focus {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.form-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

button {
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--acid);
  padding: .85rem 1rem;
  font: 700 .75rem/1 var(--font-mono);
  text-transform: uppercase;
  cursor: pointer;
}

button:hover {
  background: transparent;
  color: var(--ink);
}

#form-status {
  font: .72rem/1.3 var(--font-mono);
}

.contact-aside {
  grid-column: 2;
  border-left: 1px solid #8d9944;
  padding-left: 1.5rem;
  align-self: end;
}

.aside-label {
  display: block;
  margin-top: 1.3rem;
  font: 700 .65rem/1 var(--font-mono);
  text-transform: uppercase;
}

.aside-label:first-child { margin-top: 0; }

.contact-aside a {
  display: inline-block;
  margin-top: .4rem;
  font: 1rem/1.2 var(--font-mono);
}

.contact-aside p {
  max-width: 38ch;
  font-size: .88rem;
}

.site-footer {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 1rem var(--gutter) 2rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: #77766e;
  font: .68rem/1.4 var(--font-mono);
}

.site-footer a {
  color: var(--paper);
  text-decoration: none;
}

.site-footer a:hover { color: var(--acid); }

@media (max-width: 900px) {
  .section-frame {
    grid-template-columns: 1fr;
  }
  .section-heading { grid-column: 1; }
  .capability-list, .timeline, .model-grid, .proof-layout, .case-study-list, .about-content, .faq-list { grid-column: 1; }
  .about-content { grid-template-columns: 1fr; }
  .contact-main { grid-column: 1; }
  .contact-aside { grid-column: 1; }
  .model-grid { grid-template-columns: 1fr; }
  .model-statement + .model-statement {
    border-left: 0;
    padding-left: 0;
  }
}

@media (max-width: 620px) {
  .site-header { min-height: 4rem; flex-wrap: wrap; }
  .header-nav { display: none; }
  .brand-name { display: none; }
  .header-cta { font-size: .6rem; }
  .hero { min-height: auto; padding-top: 5rem; }
  h1 { font-size: clamp(3rem, 16vw, 5rem); }
  .hero-proof { align-items: flex-start; }
  .section-frame {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-block: 4rem;
  }
  .capability {
    grid-template-columns: 1fr;
    gap: .8rem;
  }
  .capability-meta { justify-content: flex-start; gap: 1rem; }
  .timeline-item {
    grid-template-columns: 1fr;
  }
  .timeline-item time { grid-column: 1; }
  .case-study-metrics {
    grid-template-columns: 1fr;
  }
  .cost-row {
    grid-template-columns: 1.3fr .8fr .8fr;
    font-size: .78rem;
  }
  .contact-aside {
    border-left: 0;
    border-top: 1px solid #8d9944;
    padding: 1rem 0 0;
  }
  .form-footer {
    align-items: flex-start;
    flex-direction: column;
  }
  .site-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stack-track { animation: none; }
}