:root {
  color-scheme: light dark;
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-muted: #eef1f6;
  --ink: #101828;
  --muted: #5a6472;
  --line: rgba(16, 24, 40, 0.1);
  --line-strong: rgba(16, 24, 40, 0.18);
  --accent: #2f6bff;
  --accent-soft: #e3ecff;
  --accent-muted: #f0f5ff;
  --accent-ink: #1f4fd1;
  --shadow: 0 20px 50px rgba(16, 24, 40, 0.1);
  --shadow-soft: 0 10px 28px rgba(16, 24, 40, 0.07);
  --radius-lg: 20px;
  --radius-md: 14px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", "Liberation Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c111b;
    --surface: #131a26;
    --surface-muted: #1a2331;
    --ink: #f2f5fa;
    --muted: #9aa4b4;
    --line: rgba(242, 245, 250, 0.1);
    --line-strong: rgba(242, 245, 250, 0.18);
    --accent: #6f97ff;
    --accent-soft: rgba(111, 151, 255, 0.16);
    --accent-muted: rgba(111, 151, 255, 0.08);
    --accent-ink: #b9ccff;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    --shadow-soft: 0 10px 28px rgba(0, 0, 0, 0.32);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

section,
.contact-section {
  scroll-margin-top: 88px;
}

.site-shell {
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 40px);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  min-height: 64px;
  margin-bottom: 8px;
  padding: 10px 0;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: max-content;
}

.brand img {
  width: 128px;
  height: auto;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: clamp(16px, 2.4vw, 30px);
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 560;
}

.site-nav a {
  padding: 6px 0;
  transition: color 160ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-select {
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 6px 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--muted);
}

.language-select select {
  max-width: 96px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 560;
  outline: 0;
  cursor: pointer;
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: max-content;
  min-height: 40px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, border-color 160ms ease;
}

.nav-cta {
  padding: 0 16px;
  background: var(--ink);
  color: var(--bg);
}

.button {
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  font-size: 0.98rem;
}

.button-primary {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--accent) 26%, transparent);
}

.button-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button:hover,
.nav-cta:hover,
.button:focus-visible,
.nav-cta:focus-visible {
  transform: translateY(-1px);
}

.button:active,
.nav-cta:active {
  transform: translateY(1px);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 17px;
  height: 2px;
  margin: 4px auto;
  border-radius: 99px;
  background: currentColor;
  transition: transform 180ms ease;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  align-items: center;
  gap: clamp(28px, 4vw, 56px);
  padding: clamp(40px, 5vw, 72px) 0 clamp(48px, 5vw, 72px);
}

.hero-copy {
  max-width: 520px;
}

.kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--accent-muted);
  color: var(--accent-ink);
  font-size: 0.78rem;
  font-weight: 620;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 3.4vw, 3.1rem);
  font-weight: 680;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.hero-lede {
  max-width: 34rem;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.2vw, 1.12rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* Browser frame for real product screenshots */
.browser {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-muted);
}

.browser-bar span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line-strong);
}

.browser-url {
  margin-left: 10px;
  padding: 3px 10px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-style: normal;
}

.browser img {
  width: 100%;
  height: auto;
}

.hero-shot {
  margin: 0;
}

/* Value strip */
.value-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(32px, 4vw, 46px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.value-strip strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.05rem;
  font-weight: 640;
}

.value-strip p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Sections */
.section,
.contact-section {
  padding: clamp(56px, 7vw, 96px) 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: clamp(32px, 4vw, 48px);
}

.section-label {
  margin: 0 0 12px;
  color: var(--accent-ink);
  font-size: 0.82rem;
  font-weight: 640;
}

h2 {
  margin: 0;
  font-size: clamp(1.6rem, 2.6vw, 2.35rem);
  font-weight: 680;
  line-height: 1.14;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.section-head p {
  max-width: 56ch;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.15vw, 1.1rem);
}

/* Two surfaces */
.surface-row {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  align-items: center;
  gap: clamp(28px, 4vw, 60px);
  padding: clamp(28px, 3.5vw, 44px) 0;
}

.surface-row + .surface-row {
  border-top: 1px solid var(--line);
}

.surface-row.reverse .surface-copy {
  order: 2;
}

.surface-tag {
  margin: 0 0 12px;
  color: var(--accent-ink);
  font-size: 0.84rem;
  font-weight: 620;
}

.surface-copy h3 {
  margin: 0;
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  font-weight: 660;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.surface-copy > p {
  margin: 14px 0 0;
  max-width: 42ch;
  color: var(--muted);
}

.surface-points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.surface-points li {
  position: relative;
  padding-left: 26px;
  color: var(--ink);
  font-size: 0.96rem;
}

.surface-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
  border-radius: 1px;
}

.surface-shot {
  margin: 0;
}

/* Governance */
.governance-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.governance-copy {
  position: sticky;
  top: 90px;
}

.governance-copy h2 {
  margin-top: 0;
}

.governance-copy p:not(.section-label) {
  margin: 14px 0 0;
  color: var(--muted);
}

.governance-matrix {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.governance-matrix article {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.governance-matrix h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  font-weight: 640;
  letter-spacing: -0.01em;
}

.governance-matrix p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

/* Workflow */
.workflow-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.workflow-track li {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.workflow-track b {
  display: block;
  margin-bottom: 20px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 640;
}

.workflow-track strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.12rem;
  font-weight: 640;
  letter-spacing: -0.01em;
}

.workflow-track p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Skills / capability market */
.skills-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(28px, 4vw, 56px);
}

.skills-copy > p:not(.section-label) {
  margin: 14px 0 0;
  max-width: 44ch;
  color: var(--muted);
}

.skills-shot {
  margin: 0;
}

/* Teams */
.teams-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.teams-list article {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.teams-list h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  font-weight: 640;
  letter-spacing: -0.01em;
}

.teams-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

/* Contact */
.contact {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius-lg) + 6px);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.contact-copy h2 {
  margin: 12px 0 0;
}

.contact-copy > p:not(.section-label) {
  margin: 14px 0 0;
  color: var(--muted);
}

.contact-domestic {
  display: none;
  gap: 12px;
  margin-top: 24px;
}

body[data-lang="zh"] .contact-domestic {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
}

body[data-lang="zh"] .inquiry-form {
  display: none;
}

body[data-lang="zh"] .contact {
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
}

body[data-lang="zh"] .contact-copy {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
  grid-column: 1 / -1;
}

body[data-lang="zh"] .contact-copy > .section-label,
body[data-lang="zh"] .contact-copy > h2,
body[data-lang="zh"] .contact-copy > p {
  grid-column: 1;
}

body[data-lang="zh"] .contact-domestic {
  grid-column: 2;
  grid-row: 1 / span 3;
  margin-top: 0;
}

.contact-domestic a,
.wechat-card {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
}

.wechat-card img {
  width: min(260px, 100%);
  border: 10px solid var(--surface);
  border-radius: 18px;
  background: #fff;
}

.wechat-card {
  grid-column: 1 / -1;
}

.contact-domestic span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 560;
}

.contact-domestic strong {
  font-size: 1.05rem;
}

.inquiry-form {
  display: grid;
  gap: 14px;
}

.inquiry-form label {
  display: grid;
  gap: 6px;
}

.inquiry-form span {
  font-size: 0.88rem;
  font-weight: 560;
  color: var(--ink);
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 12px 14px;
  background: var(--surface);
  color: var(--ink);
  outline: 0;
}

.inquiry-form input::placeholder,
.inquiry-form textarea::placeholder {
  color: color-mix(in srgb, var(--muted) 82%, transparent);
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.inquiry-form textarea {
  min-height: 112px;
  resize: vertical;
}

.form-status {
  min-height: 1.4em;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.form-status.is-success {
  color: #0f8a5f;
}

.form-status.is-error {
  color: #b42318;
}

/* Footer */
.site-footer {
  display: grid;
  grid-template-columns: minmax(180px, 0.8fr) minmax(260px, 1.05fr) minmax(320px, 1.15fr);
  align-items: start;
  gap: clamp(24px, 4vw, 56px);
  padding: 32px 0 44px;
  margin-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

.footer-brand-block,
.footer-company,
.footer-address {
  display: grid;
  gap: 10px;
}

.footer-brand-block {
  gap: 20px;
}

.footer-company p:first-child {
  color: var(--ink);
  font-weight: 700;
}

.footer-company p,
.footer-address p,
.footer-brand-block p {
  line-height: 1.55;
}

.footer-brand img {
  width: 116px;
}

/* Reveal */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 520ms cubic-bezier(0.16, 1, 0.3, 1), transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* Responsive */
@media (max-width: 1080px) {
  .site-header {
    grid-template-columns: auto auto;
  }

  .site-nav,
  .header-actions {
    display: none;
  }

  .menu-button {
    display: block;
    justify-self: end;
  }

  .site-header.is-open {
    row-gap: 4px;
  }

  .site-header.is-open .site-nav,
  .site-header.is-open .header-actions {
    display: flex;
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .site-header.is-open .site-nav {
    flex-wrap: wrap;
    padding-top: 10px;
  }

  .site-header.is-open .header-actions {
    align-items: stretch;
    flex-direction: column;
    padding-bottom: 8px;
  }

  .site-header.is-open .language-select,
  .site-header.is-open .nav-cta {
    width: 100%;
    justify-content: center;
  }

  .site-header.is-open .menu-button span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header.is-open .menu-button span:nth-child(2) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-copy {
    max-width: 640px;
  }

  .surface-row,
  .surface-row.reverse,
  .governance-panel,
  .skills-layout,
  .contact {
    grid-template-columns: 1fr;
  }

  body[data-lang="zh"] .contact,
  body[data-lang="zh"] .contact-copy {
    grid-template-columns: 1fr;
  }

  body[data-lang="zh"] .contact-domestic {
    grid-column: auto;
    grid-row: auto;
    margin-top: 20px;
  }

  body[data-lang="zh"] .contact-copy > .section-label,
  body[data-lang="zh"] .contact-copy > h2,
  body[data-lang="zh"] .contact-copy > p {
    grid-column: auto;
  }

  .surface-row.reverse .surface-copy {
    order: 0;
  }

  .governance-copy {
    position: static;
  }

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

  .site-footer {
    grid-template-columns: 1fr 1fr;
  }

  .footer-address {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .value-strip,
  .governance-matrix,
  .workflow-track,
  .teams-list {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .contact {
    padding: 22px;
  }

  body[data-lang="zh"] .contact-domestic {
    grid-template-columns: 1fr;
  }

  .site-footer {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 14px;
  }
}