:root {
  --paper: #f2efe7;
  --ink: #151713;
  --muted: #686b62;
  --line: rgba(21, 23, 19, 0.18);
  --acid: #d4f13f;
  --orange: #ee6b38;
  --panel: rgba(255, 255, 255, 0.58);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --sans: "Avenir Next Condensed", "DIN Condensed", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(212, 241, 63, 0.2), transparent 24rem),
    radial-gradient(circle at 88% 34%, rgba(238, 107, 56, 0.13), transparent 25rem),
    linear-gradient(var(--paper), #e9e5da);
  font-family: var(--serif);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.25;
  background-image:
    linear-gradient(rgba(21, 23, 19, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 23, 19, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}

a {
  color: inherit;
}

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

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  border-bottom: 1px solid var(--line);
  font-family: var(--sans);
}

.brand {
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 28px;
}

nav a {
  position: relative;
  padding: 30px 0 25px;
  color: var(--muted);
  font-size: 0.86rem;
  text-decoration: none;
}

nav a.active,
nav a:hover {
  color: var(--ink);
}

nav a.active::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  content: "";
  background: var(--ink);
}

.hero {
  min-height: 620px;
  padding: 105px 0 80px;
}

.principles-hero {
  min-height: 560px;
}

.eyebrow,
.case-number {
  margin: 0 0 22px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.16em;
}

.hero h1 {
  max-width: 930px;
  margin: 0;
  font-size: clamp(3.5rem, 8.5vw, 8rem);
  font-weight: 500;
  letter-spacing: -0.075em;
  line-height: 0.92;
}

.hero-copy {
  max-width: 660px;
  margin: 44px 0 0 auto;
  color: #383b34;
  font-size: clamp(1.08rem, 1.8vw, 1.35rem);
  line-height: 1.8;
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 55px;
}

.hero-facts span {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.3);
  font-family: var(--sans);
  font-size: 0.78rem;
}

.case-study {
  padding: 110px 0;
  border-top: 1px solid var(--line);
}

.case-heading {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 50px;
  margin-bottom: 42px;
}

.case-heading h2,
.section-intro h2,
.closing h2 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 5.2rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 1;
}

.case-summary {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.8;
}

.result-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  background: #1b211e;
}

.result-frame.warm {
  background: #d8cfbb;
}

.result-frame img {
  width: 100%;
  max-height: 760px;
  object-fit: contain;
}

.result-frame figcaption {
  position: absolute;
  right: 18px;
  bottom: 18px;
  padding: 8px 12px;
  border-radius: 2px;
  color: white;
  background: rgba(21, 23, 19, 0.8);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 12px;
}

.process-grid figure {
  margin: 0;
  background: var(--panel);
}

.process-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.process-grid figcaption {
  padding: 14px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 48px 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.metrics div {
  padding: 25px 28px;
  border-right: 1px solid var(--line);
}

.metrics div:last-child {
  border-right: 0;
}

.metrics dt {
  margin-bottom: 9px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.74rem;
}

.metrics dd {
  margin: 0;
  font-size: 1.25rem;
}

.pipeline,
.strategy,
.limits {
  padding: 100px 0;
  border-top: 1px solid var(--line);
}

.section-intro {
  margin-bottom: 55px;
}

.pipeline ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.pipeline li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.pipeline li:last-child {
  border-bottom: 1px solid var(--line);
}

.pipeline li > span {
  color: var(--orange);
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 800;
}

.pipeline h3,
.strategy h3 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  font-weight: 500;
}

.pipeline p,
.strategy article > p:last-child {
  max-width: 650px;
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.strategy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.strategy article {
  min-height: 300px;
  padding: 38px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.strategy article:first-child {
  box-shadow: inset 0 5px 0 var(--orange);
}

.strategy article:last-child {
  box-shadow: inset 0 5px 0 var(--acid);
}

.limit-list {
  border-top: 1px solid var(--line);
}

.limit-list p {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  margin: 0;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  line-height: 1.7;
}

.limit-list span {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 700;
}

.closing {
  padding: 120px 0;
  border-top: 1px solid var(--line);
}

.closing p:not(.eyebrow) {
  max-width: 620px;
  margin: 32px 0;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.8;
}

.button {
  display: inline-block;
  padding: 15px 22px;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  background: var(--orange);
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 30px 0 45px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

@media (max-width: 760px) {
  .site-header,
  main,
  footer {
    width: min(100% - 24px, 1180px);
  }

  .site-header {
    min-height: 68px;
  }

  nav {
    gap: 18px;
  }

  nav a {
    padding: 24px 0 20px;
  }

  .hero {
    min-height: auto;
    padding: 80px 0 70px;
  }

  .hero h1 {
    font-size: clamp(3rem, 15vw, 5rem);
  }

  .hero-copy {
    margin-top: 35px;
  }

  .case-study,
  .pipeline,
  .strategy,
  .limits,
  .closing {
    padding: 72px 0;
  }

  .case-heading,
  .strategy-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .process-grid {
    grid-template-columns: 1fr 1fr;
  }

  .metrics {
    grid-template-columns: 1fr;
  }

  .metrics div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .metrics div:last-child {
    border-bottom: 0;
  }

  .pipeline li {
    grid-template-columns: 55px 1fr;
  }

  .limit-list p {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}