:root {
  --radius: 8px;
  --max-width: 1180px;
  --header-height: 82px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--page);
}

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

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

body.lang-en [lang="zh"],
body.lang-zh [lang="en"] {
  display: none !important;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
  padding: 14px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid var(--header-border);
  background: var(--header-bg);
  backdrop-filter: blur(18px);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 214px;
}

.brand-lockup img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.brand-lockup span {
  display: grid;
  gap: 1px;
}

.brand-lockup strong {
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

.brand-lockup small {
  color: var(--muted);
  font-size: 11px;
  font-weight: 850;
  line-height: 1;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 24px);
  color: var(--nav-text);
  font-size: 14px;
  font-weight: 760;
}

.language-switch {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--control-border);
  border-radius: 999px;
  background: var(--control-bg);
}

.language-switch button {
  min-width: 44px;
  min-height: 34px;
  border: 0;
  border-radius: 999px;
  color: var(--control-text);
  background: transparent;
  font: 800 13px/1 inherit;
  cursor: pointer;
}

.language-switch button.active {
  color: var(--control-active-text);
  background: var(--control-active);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(310px, 0.72fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  min-height: calc(100vh - var(--header-height));
  padding: clamp(64px, 9vw, 116px) clamp(20px, 5vw, 72px);
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 24px;
  color: var(--heading);
  font-size: clamp(42px, 7vw, 82px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  color: var(--heading);
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  color: var(--heading);
  font-size: 22px;
  line-height: 1.18;
}

p {
  color: var(--muted);
  line-height: 1.7;
}

.hero-copy {
  max-width: 690px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 850;
}

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

.button.secondary {
  border: 1px solid var(--button-secondary-border);
  color: var(--button-secondary-text);
  background: var(--button-secondary-bg);
}

.hero-visual {
  position: relative;
  z-index: 2;
  min-height: 430px;
}

.mark-card {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  min-height: 360px;
  border-radius: var(--radius);
  background: var(--visual-card);
  box-shadow: var(--visual-shadow);
  overflow: hidden;
}

.mark-card img {
  width: min(82%, 340px);
  border-radius: 50%;
  mix-blend-mode: normal;
}

.signal-card {
  position: absolute;
  right: -10px;
  bottom: 22px;
  z-index: 3;
  display: flex;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  background: var(--signal-bg);
  box-shadow: var(--signal-shadow);
}

.signal-card span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  color: var(--signal-text);
  background: var(--signal-pill);
  font-size: 12px;
  font-weight: 900;
}

.section,
.contact-section {
  padding: clamp(64px, 8vw, 108px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 36px;
}

.intro-grid,
.model-section,
.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1fr);
  gap: clamp(32px, 6vw, 76px);
  align-items: start;
}

.intro-grid p,
.model-copy p {
  max-width: 720px;
  font-size: 18px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.service-card {
  min-height: 310px;
  padding: 28px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--card-bg);
}

.service-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 42px;
  border-radius: 50%;
  color: var(--index-text);
  background: var(--index-bg);
  font-weight: 950;
}

.model-section {
  background: var(--soft-section);
}

.model-points {
  display: grid;
  gap: 14px;
}

.model-points div {
  padding: 22px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--card-bg);
}

.model-points strong {
  display: block;
  margin-bottom: 8px;
  color: var(--heading);
  font-size: 18px;
}

.model-points span {
  color: var(--muted);
  line-height: 1.6;
}

.alignment-grid,
.industry-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.alignment-grid span,
.industry-list span {
  min-height: 74px;
  padding: 18px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--heading);
  background: var(--card-bg);
  font-weight: 820;
}

.contact-section {
  color: var(--contact-text);
  background: var(--contact-bg);
}

.contact-section h2,
.contact-section .section-kicker {
  color: var(--contact-text);
}

.contact-section p {
  color: var(--contact-muted);
}

.contact-card {
  display: grid;
  gap: 14px;
  justify-items: start;
  align-self: end;
}

.contact-card a {
  display: inline-flex;
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 900;
  line-height: 1.08;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 26px clamp(20px, 5vw, 72px);
  color: var(--footer-text);
  background: var(--footer-bg);
  font-size: 14px;
  font-weight: 700;
}

@media (max-width: 1040px) {
  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-wrap: wrap;
    padding: 16px 20px;
  }

  .site-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .language-switch {
    margin-left: auto;
  }

  .hero,
  .intro-grid,
  .model-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 52px;
  }

  .hero-visual {
    min-height: 330px;
  }

  .mark-card {
    min-height: 300px;
  }

  .service-grid,
  .alignment-grid,
  .industry-list {
    grid-template-columns: 1fr;
  }

  .signal-card {
    position: static;
    margin-top: 14px;
    width: fit-content;
    max-width: 100%;
    flex-wrap: wrap;
  }

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

@media (max-width: 520px) {
  .brand-lockup {
    min-width: 0;
  }

  .brand-lockup img {
    width: 42px;
    height: 42px;
  }

  .brand-lockup strong {
    font-size: 18px;
  }

  .site-nav {
    gap: 14px;
    font-size: 13px;
  }

  h1 {
    font-size: 42px;
  }
}