:root {
  color-scheme: light;
  --ink: #111417;
  --muted: #5b626b;
  --line: #dce1e4;
  --paper: #f7f8f6;
  --white: #ffffff;
  --teal: #0c8f8a;
  --amber: #d79627;
  --red: #b94c45;
  --graphite: #20262b;
  --shadow: 0 22px 70px rgba(17, 20, 23, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 18px clamp(20px, 4vw, 54px);
  color: var(--white);
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(247, 248, 246, 0.94);
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(17, 20, 23, 0.08);
  backdrop-filter: blur(18px);
}

.brand,
.site-nav,
.nav-action {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 720;
  letter-spacing: 0;
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  overflow: visible;
}

.brand-mark-shell {
  fill: currentColor;
}

.brand-mark-accent {
  fill: #20c7bf;
}

.site-nav {
  gap: clamp(14px, 2.6vw, 28px);
  font-size: 14px;
  color: currentColor;
}

.site-nav a {
  opacity: 0.82;
}

.site-nav a:hover,
.nav-action:hover {
  opacity: 1;
}

.nav-action {
  justify-self: end;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid currentColor;
  border-radius: 8px;
  font-size: 14px;
  opacity: 0.9;
}

.hero {
  position: relative;
  min-height: 94svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--graphite);
}

.hero-media,
.hero-media img,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(15, 18, 20, 0.88) 0%, rgba(15, 18, 20, 0.6) 40%, rgba(15, 18, 20, 0.18) 100%),
    linear-gradient(0deg, rgba(15, 18, 20, 0.5) 0%, rgba(15, 18, 20, 0) 44%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(820px, 100%);
  padding: 142px clamp(20px, 6vw, 80px) clamp(52px, 8vw, 96px);
  color: var(--white);
}

.eyebrow,
.section-kicker {
  margin: 0 0 20px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #8bdedb;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(70px, 10vw, 138px);
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(32px, 4.2vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 24px;
  line-height: 1.15;
}

.hero-copy {
  max-width: 620px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.83);
  font-size: clamp(18px, 1.7vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 680;
}

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

.button-secondary {
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: var(--white);
}

.section {
  padding: clamp(70px, 10vw, 132px) clamp(20px, 6vw, 80px);
}

.split,
.capability-layout,
.contact {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: clamp(36px, 7vw, 96px);
  align-items: start;
}

.prose {
  color: var(--muted);
  font-size: clamp(17px, 1.6vw, 20px);
}

.prose p:last-child,
.capability-layout p {
  margin-bottom: 0;
}

.build {
  background: #fbfbf8;
  border-top: 1px solid rgba(17, 20, 23, 0.06);
}

.build-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(420px, 1.15fr);
  gap: clamp(40px, 7vw, 104px);
  align-items: start;
}

.build-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.build-points article {
  min-height: 210px;
  padding: 26px;
  background: var(--white);
}

.build-points h3 {
  font-size: 21px;
}

.build-points p {
  margin-bottom: 0;
  color: var(--muted);
}

.principles {
  background: var(--white);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(420px, 0.9fr);
  gap: clamp(30px, 6vw, 88px);
  margin-bottom: 32px;
}

.section-heading .section-kicker {
  margin-bottom: 0;
}

.section-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(17px, 1.5vw, 20px);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.principle-grid article {
  min-height: 250px;
  padding: 30px;
  background: var(--white);
}

.index {
  display: block;
  margin-bottom: 54px;
  color: var(--red);
  font-size: 13px;
  font-weight: 760;
}

.principle-grid p,
.capability-layout p {
  color: var(--muted);
}

.capability-band {
  background: #edf1ee;
}

.capability-layout {
  align-items: center;
}

.capability-list {
  display: grid;
  gap: 12px;
}

.capability-list div {
  display: grid;
  gap: 4px;
  padding: 18px 20px;
  border-left: 4px solid var(--teal);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 1px 0 rgba(17, 20, 23, 0.04);
}

.capability-list div:nth-child(2) {
  border-left-color: var(--amber);
}

.capability-list div:nth-child(3) {
  border-left-color: var(--red);
}

.capability-list div:nth-child(4) {
  border-left-color: var(--graphite);
}

.capability-list strong {
  font-size: 18px;
}

.capability-list span {
  color: var(--muted);
}

.products {
  background: var(--white);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.product-card {
  display: grid;
  align-content: start;
  gap: 8px;
  min-height: 210px;
  padding: 28px 26px;
  background: var(--white);
  transition:
    background 160ms ease,
    transform 160ms ease;
}

.product-card:hover {
  background: #fbfbf8;
  transform: translateY(-2px);
}

.product-name {
  font-size: 22px;
  font-weight: 720;
}

.product-tagline {
  color: var(--ink);
  font-size: 16px;
}

.product-zh {
  color: var(--muted);
  font-size: 15px;
}

.product-link {
  margin-top: auto;
  padding-top: 14px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 680;
  letter-spacing: 0.02em;
}

.manifesto {
  display: flex;
  align-items: center;
  min-height: 340px;
  padding: clamp(64px, 9vw, 108px) clamp(20px, 6vw, 80px);
  background: var(--graphite);
  color: var(--white);
}

.manifesto p {
  width: min(960px, 100%);
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(32px, 4.3vw, 68px);
  line-height: 1.08;
}

.contact {
  align-items: center;
  background: var(--paper);
}

.contact h2 {
  max-width: 860px;
}

.contact-panel {
  display: grid;
  gap: 14px;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}

.contact-panel a {
  color: var(--teal);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 760;
  overflow-wrap: anywhere;
}

.contact-panel span {
  color: var(--muted);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 6vw, 80px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    display: none;
  }

  .split,
  .build-layout,
  .capability-layout,
  .contact,
  .section-heading {
    grid-template-columns: 1fr;
  }

  .build-points {
    grid-template-columns: 1fr;
  }

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

  .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 18px;
  }

  .nav-action {
    min-height: 36px;
    padding: 0 12px;
  }

  .hero {
    min-height: 92svh;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(15, 18, 20, 0.92), rgba(15, 18, 20, 0.66)),
      linear-gradient(0deg, rgba(15, 18, 20, 0.55), rgba(15, 18, 20, 0));
  }

  .hero-inner {
    padding: 118px 20px 46px;
  }

  h1 {
    font-size: clamp(58px, 18vw, 86px);
  }

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

  .principle-grid article {
    min-height: 220px;
  }

  .index {
    margin-bottom: 46px;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .section {
    padding: 64px 24px;
  }

  h2 {
    font-size: 34px;
    line-height: 1.08;
  }

  .build-points article,
  .product-card {
    min-height: 0;
  }

  .manifesto {
    min-height: 0;
    padding: 56px 24px;
  }

  .manifesto p {
    font-size: 30px;
    line-height: 1.12;
  }

  .contact {
    gap: 28px;
  }
}