:root {
  color-scheme: light dark;
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-soft: #eef3f9;
  --surface-blue: #eaf2ff;
  --surface-deep: #e1ebf8;
  --text: #172033;
  --muted: #617089;
  --line: #d8e1ee;
  --line-strong: #becbe0;
  --accent: #2868c7;
  --accent-hover: #1f55a6;
  --accent-soft: #e7f0fd;
  --accent-ink: #ffffff;
  --overlay: rgba(11, 18, 32, 0.78);
  --shadow-sm: 0 12px 30px rgba(31, 55, 92, 0.08);
  --shadow-lg: 0 24px 64px rgba(31, 55, 92, 0.14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --shell: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111621;
    --surface: #171e2b;
    --surface-soft: #1d2635;
    --surface-blue: #192a44;
    --surface-deep: #21324b;
    --text: #edf3fb;
    --muted: #a8b4c7;
    --line: #2b374a;
    --line-strong: #41506a;
    --accent: #78aaf1;
    --accent-hover: #9fc3f5;
    --accent-soft: #1d3150;
    --accent-ink: #10203a;
    --overlay: rgba(5, 9, 17, 0.84);
    --shadow-sm: 0 12px 30px rgba(3, 7, 15, 0.24);
    --shadow-lg: 0 24px 64px rgba(3, 7, 15, 0.38);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body.nav-open,
body.lightbox-open {
  overflow: hidden;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 48%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 300;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--text);
  color: var(--bg);
}

.skip-link:focus {
  top: 12px;
}

.shell {
  width: min(var(--shell), calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(18px);
}

.nav-wrap {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--accent);
  font-size: 17px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 14px;
  font-weight: 620;
  transition: color 160ms ease, background 160ms ease;
}

.site-nav a:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.site-nav .nav-cta {
  margin-left: 8px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--text);
}

.nav-toggle {
  display: none;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
}

.hero {
  min-height: min(720px, calc(100dvh - 70px));
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.72fr);
  align-items: center;
  gap: 86px;
  padding-block: 72px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.hero h1,
.section-heading h2,
.architecture-copy h2,
.use-case-grid h2,
.cta h2 {
  margin: 0;
  font-weight: 740;
  letter-spacing: -0.042em;
  line-height: 1.14;
}

.hero h1 {
  max-width: 720px;
  font-size: clamp(42px, 5.3vw, 66px);
}

.hero-lead {
  max-width: 600px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

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

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 19px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 720;
  white-space: nowrap;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(1px);
}

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

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

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

.button-secondary:hover {
  border-color: var(--accent);
}

.hero-facts {
  margin: 0;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.hero-facts-title {
  margin: 0 0 18px;
  font-size: 14px;
  font-weight: 740;
}

.hero-facts dl {
  margin: 0;
}

.hero-facts dl div {
  display: grid;
  grid-template-columns: 105px 1fr;
  gap: 18px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
}

.hero-facts dt,
.hero-facts dd {
  margin: 0;
  font-size: 13px;
}

.hero-facts dt {
  color: var(--muted);
}

.hero-facts dd {
  font-weight: 650;
}

.hero-facts-note {
  margin: 17px 0 0;
  padding-top: 17px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.proof-strip {
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.proof-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}

.proof-grid p {
  margin: 0;
  padding: 25px 28px;
  border-right: 1px solid var(--line);
}

.proof-grid p:first-child {
  padding-left: 0;
}

.proof-grid p:last-child {
  border-right: 0;
}

.proof-grid strong,
.proof-grid span {
  display: block;
}

.proof-grid strong {
  margin-bottom: 3px;
  font-size: 14px;
}

.proof-grid span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding-block: 108px;
}

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

.section-heading {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-heading h2,
.architecture-copy h2,
.use-case-grid h2,
.cta h2 {
  font-size: clamp(34px, 4vw, 50px);
}

.section-heading > p:last-child,
.architecture-copy > p {
  max-width: 680px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.feature-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.7fr);
  gap: 22px;
  align-items: stretch;
}

.feature-primary {
  min-height: 470px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--accent-soft);
}

.feature-primary h3,
.feature-secondary h3 {
  margin: 0;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.feature-primary h3 {
  max-width: 620px;
  font-size: 35px;
}

.feature-primary > p:not(.feature-label) {
  max-width: 650px;
  margin: 16px 0 0;
  color: var(--muted);
}

.feature-label {
  margin: 0 0 11px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 760;
}

.preview-link {
  width: max-content;
  margin-top: 26px;
  padding: 0 0 3px;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
  font-weight: 720;
  cursor: pointer;
}

.preview-link:hover {
  color: var(--accent-hover);
}

.feature-secondary {
  display: grid;
  gap: 22px;
}

.feature-secondary article {
  display: flex;
  min-height: 224px;
  flex-direction: column;
  justify-content: flex-end;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.feature-secondary h3 {
  font-size: 23px;
}

.feature-secondary article > p:not(.feature-label) {
  margin: 11px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.screenshot-card {
  min-width: 0;
  grid-column: span 5;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  text-align: left;
  box-shadow: var(--shadow-sm);
  cursor: zoom-in;
  appearance: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.screenshot-card.screenshot-wide {
  grid-column: span 7;
}

.screenshot-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
}

.screenshot-card:active {
  transform: translateY(1px);
}

.screenshot-media {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--surface-deep);
}

.screenshot-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 180ms ease;
}

.screenshot-card:hover .screenshot-media img {
  transform: scale(1.012);
}

.screenshot-caption {
  display: grid;
  gap: 3px;
  padding: 17px 18px 18px;
}

.screenshot-caption strong {
  font-size: 14px;
}

.screenshot-caption small {
  color: var(--muted);
  font-size: 12px;
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.steps li {
  min-height: 205px;
  padding: 25px;
  border-top: 3px solid var(--accent);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.steps h3 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.steps p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.architecture-section {
  background: var(--surface-blue);
}

.architecture-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(520px, 1.28fr);
  gap: 72px;
  align-items: center;
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.tech-list span {
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
}

.architecture-map {
  display: grid;
  gap: 14px;
}

.arch-node {
  padding: 21px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.arch-node small,
.arch-node strong,
.arch-node span {
  display: block;
}

.arch-node small {
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 760;
}

.arch-node strong {
  font-size: 18px;
}

.arch-node span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.arch-client,
.arch-api {
  width: 72%;
}

.arch-api {
  margin-left: 14%;
}

.arch-connector {
  width: 72%;
  margin-left: 7%;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.1em;
}

.arch-branches {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.use-case-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  gap: 84px;
  align-items: start;
}

.use-case-list {
  display: grid;
  gap: 14px;
}

.use-case-list p {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 22px;
  margin: 0;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.use-case-list strong {
  font-size: 14px;
}

.use-case-list span {
  color: var(--muted);
  font-size: 14px;
}

.cta {
  min-height: 340px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 50px;
  align-items: center;
}

.cta h2 {
  max-width: 760px;
}

.cta-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 13px;
}

.text-link {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  text-align: center;
}

.text-link:hover {
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-row {
  min-height: 96px;
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  align-items: center;
  gap: 30px;
}

.footer-row p,
.footer-row a {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.footer-row p:first-child {
  color: var(--text);
  font-weight: 720;
}

.footer-row a:hover {
  color: var(--accent);
}

.image-lightbox {
  width: min(1240px, calc(100vw - 40px));
  max-width: none;
  max-height: calc(100dvh - 40px);
  margin: auto;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-lg);
}

.image-lightbox[open] {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}

.image-lightbox::backdrop {
  background: var(--overlay);
  backdrop-filter: blur(8px);
}

.lightbox-toolbar {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 16px 12px 20px;
  border-bottom: 1px solid var(--line);
}

.lightbox-toolbar div {
  min-width: 0;
}

.lightbox-toolbar strong,
.lightbox-toolbar span {
  display: block;
}

.lightbox-toolbar strong {
  overflow: hidden;
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lightbox-toolbar span {
  margin-top: 1px;
  color: var(--muted);
  font-size: 11px;
}

.lightbox-toolbar button {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  cursor: pointer;
}

.lightbox-toolbar button:hover {
  border-color: var(--accent);
}

.lightbox-stage {
  min-height: 0;
  display: grid;
  place-items: center;
  overflow: auto;
  padding: 18px;
  background: #101522;
}

.lightbox-stage img {
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: calc(100dvh - 145px);
  object-fit: contain;
}

@media (max-width: 1020px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 42px;
    padding-block: 68px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .hero-facts {
    max-width: 720px;
  }

  .feature-layout,
  .architecture-grid,
  .use-case-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .feature-primary {
    min-height: 360px;
  }

  .feature-secondary {
    grid-template-columns: 1fr 1fr;
  }

  .screenshot-card,
  .screenshot-card.screenshot-wide {
    grid-column: span 6;
  }

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

  .architecture-copy {
    max-width: 720px;
  }

}

@media (max-width: 760px) {
  html {
    scroll-padding-top: 68px;
  }

  .shell {
    width: min(100% - 32px, var(--shell));
  }

  .nav-wrap {
    min-height: 62px;
  }

  .brand {
    font-size: 14px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: 62px 0 auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px 16px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--bg);
    box-shadow: var(--shadow-sm);
  }

  .nav-open .site-nav {
    display: flex;
  }

  .site-nav a {
    padding: 12px 14px;
  }

  .site-nav .nav-cta {
    margin: 6px 0 0;
    text-align: center;
  }

  .hero {
    gap: 34px;
    padding-block: 54px 62px;
  }

  .hero h1 {
    font-size: 39px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
  }

  .button {
    flex: 1 1 auto;
  }

  .hero-facts {
    padding: 22px;
  }

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

  .proof-grid p,
  .proof-grid p:first-child {
    padding: 17px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .proof-grid p:last-child {
    border-bottom: 0;
  }

  .section {
    padding-block: 76px;
  }

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

  .section-heading h2,
  .architecture-copy h2,
  .use-case-grid h2,
  .cta h2 {
    font-size: 34px;
  }

  .feature-primary {
    min-height: 0;
    padding: 28px;
  }

  .feature-primary h3 {
    font-size: 28px;
  }

  .feature-secondary {
    grid-template-columns: 1fr;
  }

  .feature-secondary article {
    min-height: 0;
    padding: 25px;
  }

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

  .screenshot-card,
  .screenshot-card.screenshot-wide {
    grid-column: auto;
  }

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

  .steps li {
    min-height: 0;
  }

  .arch-client,
  .arch-api,
  .arch-connector {
    width: 100%;
    margin-left: 0;
  }

  .arch-branches {
    grid-template-columns: 1fr;
  }

  .use-case-list p {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .cta {
    min-height: 360px;
    grid-template-columns: 1fr;
    gap: 28px;
    align-content: center;
  }

  .cta-actions {
    align-items: flex-start;
  }

  .footer-row {
    min-height: 140px;
    grid-template-columns: 1fr;
    gap: 8px;
    align-content: center;
  }

  .image-lightbox {
    width: calc(100vw - 20px);
    max-height: calc(100dvh - 20px);
  }

  .lightbox-toolbar {
    min-height: 60px;
    padding: 10px 12px 10px 15px;
  }

  .lightbox-stage {
    padding: 8px;
  }

  .lightbox-stage img {
    max-height: calc(100dvh - 100px);
  }
}

@media (max-width: 420px) {
  .shell {
    width: min(100% - 24px, var(--shell));
  }

  .brand span:last-child {
    max-width: 180px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-facts dl div {
    grid-template-columns: 90px 1fr;
    gap: 10px;
  }

  .section-heading h2,
  .architecture-copy h2,
  .use-case-grid h2,
  .cta h2 {
    font-size: 31px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}