:root {
  --ink: #111312;
  --muted: #5c625f;
  --line: #d8ded8;
  --paper: #f8faf7;
  --surface: #ffffff;
  --lime: #d7ff4f;
  --coral: #ff775f;
  --blue: #2f80ed;
  --green: #0b6f4f;
  --radius: 8px;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 32px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, white);
  backdrop-filter: blur(14px);
}

.brand,
.nav,
.hero-actions,
.contact-links,
.service-row {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--lime);
  font-size: 12px;
}

.nav {
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.nav a {
  text-decoration: none;
}

.nav a:hover,
.writing-list a:hover,
.contact-links a:hover {
  color: var(--green);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(360px, 0.96fr);
  min-height: 720px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(215, 255, 79, 0.32), transparent 34%),
    linear-gradient(140deg, transparent 58%, rgba(47, 128, 237, 0.12));
}

.hero.solo {
  grid-template-columns: 1fr;
  min-height: auto;
}

.hero-inner {
  align-self: center;
  width: 100%;
  padding: 96px 0 96px max(32px, calc((100vw - var(--max)) / 2));
}

.hero.solo .hero-inner {
  max-width: var(--max);
  padding: 96px 32px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: 64px;
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 36px;
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 21px;
}

.hero-zh {
  max-width: 660px;
  margin: 16px 0 0;
  color: var(--ink);
  font-size: 16px;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  background: var(--ink);
  color: white;
}

.button.secondary {
  background: var(--surface);
}

.hero-visual {
  display: grid;
  align-items: center;
  padding: 72px max(32px, calc((100vw - var(--max)) / 2)) 72px 32px;
}

.hero-visual img {
  width: 100%;
  max-height: 560px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: white;
  box-shadow: 14px 14px 0 var(--ink);
}

.strip {
  padding: 24px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
  color: white;
}

.strip p {
  max-width: var(--max);
  margin: 0 auto;
  font-size: 18px;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 92px 32px;
}

.page-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 108px 32px 72px;
}

.page-hero h1 {
  max-width: 860px;
}

.page-hero p:not(.eyebrow) {
  max-width: 720px;
  color: var(--muted);
  font-size: 20px;
}

.case-stack {
  display: grid;
  gap: 24px;
  padding-top: 24px;
}

.work-item {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 42px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.work-item p {
  margin-top: 0;
  color: var(--muted);
}

.work-item ul,
.article ul {
  padding-left: 20px;
  color: var(--muted);
}

.inline-link {
  display: inline-flex;
  margin-top: 12px;
  color: var(--green);
  font-weight: 750;
}

.article {
  max-width: 780px;
  margin: 0 auto;
  padding: 108px 32px;
}

.article h1 {
  font-size: 52px;
}

.article h2 {
  margin-top: 42px;
  font-size: 28px;
}

.article p {
  color: var(--muted);
  font-size: 18px;
}

.article .article-lead {
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.case-card {
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--surface);
}

.case-card .label {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.case-card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.accent-lime {
  border-top: 8px solid var(--lime);
}

.accent-coral {
  border-top: 8px solid var(--coral);
}

.accent-blue {
  border-top: 8px solid var(--blue);
}

.split {
  display: grid;
  grid-template-columns: minmax(240px, 0.78fr) minmax(0, 1.22fr);
  gap: 48px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.principles {
  display: grid;
  gap: 18px;
}

.principles div,
.writing-list a {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.principles p {
  margin: 0;
  color: var(--muted);
}

.writing-list {
  border-bottom: 1px solid var(--line);
}

.writing-list a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 160px;
  gap: 20px;
  text-decoration: none;
}

.writing-list span {
  font-size: 20px;
  font-weight: 750;
}

.writing-list small {
  color: var(--muted);
  text-align: right;
}

.consulting {
  max-width: none;
  padding-left: max(32px, calc((100vw - var(--max)) / 2));
  padding-right: max(32px, calc((100vw - var(--max)) / 2));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.consulting h2 {
  max-width: 980px;
}

.service-row {
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}

.service-row span {
  padding: 9px 12px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
  font-weight: 700;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
}

.contact-links {
  align-items: stretch;
  flex-direction: column;
  gap: 10px;
}

.contact-links a {
  padding: 14px 0;
  border-top: 1px solid var(--line);
  font-weight: 750;
  text-decoration: none;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 32px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 900px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding: 18px 20px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero,
  .split,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-inner,
  .hero.solo .hero-inner {
    padding: 64px 20px 72px;
  }

  .hero-visual {
    padding: 24px 20px 72px;
  }

  .hero-visual img {
    box-shadow: 8px 8px 0 var(--ink);
  }

  h1 {
    font-size: 44px;
  }

  h2 {
    font-size: 30px;
  }

  .hero-copy {
    font-size: 18px;
  }

  .section,
  .consulting,
  .page-hero,
  .article {
    padding: 68px 20px;
  }

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

  .work-item {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .writing-list a {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .writing-list small {
    text-align: left;
  }

  .footer {
    flex-direction: column;
    padding: 24px 20px;
  }
}

@media (max-width: 520px) {
  h1 {
    font-size: 36px;
  }

  .button {
    width: 100%;
  }
}