:root {
  --ink: #111111;
  --ink-soft: #414141;
  --muted: #74716c;
  --paper: #ffffff;
  --paper-soft: #f6f3ee;
  --paper-strong: #ebe5dc;
  --line: #ded8ce;
  --line-strong: #c9c0b3;
  --rust: #c84f33;
  --green: #177b59;
  --blue: #315fba;
  --amber: #aa6600;
  --terminal: #171717;
  --terminal-line: #2a2a2a;
  --terminal-ink: #efeee9;
  --radius: 8px;
  --max: 1180px;
  --shadow: 0 18px 50px rgba(17, 17, 17, 0.16);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  overflow-x: clip;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
:lang(zh) body {
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input {
  font: inherit;
}
svg {
  display: block;
}
.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 100;
  transform: translateY(-80px);
  background: var(--ink);
  color: var(--paper);
  padding: 8px 12px;
  border-radius: var(--radius);
}
.skip-link:focus {
  transform: none;
}
.shell {
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(222, 216, 206, 0.7);
}
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0;
}
.mark,
.mark svg {
  width: 30px;
  height: 30px;
}
.mark rect {
  fill: var(--ink);
}
.mark path,
.mark circle {
  fill: none;
  stroke: var(--paper);
  stroke-width: 1.8;
}
.mark circle {
  fill: var(--paper);
}
.nav-links {
  display: flex;
  gap: 4px;
}
.nav-links a {
  color: var(--ink-soft);
  padding: 8px 10px;
  border-radius: var(--radius);
}
.nav-links a:hover {
  background: var(--paper-soft);
  color: var(--ink);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}
.language-toggle {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-soft);
}
.language-toggle button {
  appearance: none;
  border: 0;
  color: var(--muted);
  background: transparent;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}
.language-toggle button[aria-pressed="true"] {
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 1px 4px rgba(17, 17, 17, 0.08);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 42px;
  padding: 0 17px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}
.button svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
  stroke: currentColor;
  stroke-width: 1.8;
}
.button svg.stroke-icon {
  fill: none;
}
.button.primary {
  color: var(--paper);
  background: var(--ink);
  box-shadow: 0 8px 22px rgba(17, 17, 17, 0.2);
}
.button.primary:hover {
  background: #000000;
  transform: translateY(-1px);
}
.button.ghost {
  color: var(--ink);
  background: var(--paper);
  border-color: var(--line-strong);
}
.button.ghost:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}
.button.small {
  min-height: 36px;
  padding: 0 12px;
}
.button.invert {
  box-shadow: none;
}
.button.primary.invert {
  color: var(--ink);
  background: var(--paper);
}
.button.ghost.invert {
  color: var(--paper);
  background: transparent;
  border-color: rgba(255, 255, 255, 0.36);
}
.hero {
  padding: 92px 0 74px;
  background:
    linear-gradient(var(--paper) 0 0) padding-box,
    repeating-linear-gradient(90deg, rgba(17, 17, 17, 0.035) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(17, 17, 17, 0.025) 0 1px, transparent 1px 44px);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  align-items: center;
  gap: 54px;
}
.eyebrow {
  margin: 0 0 16px;
  color: var(--rust);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}
h1,
h2,
h3,
p {
  letter-spacing: 0;
}
h1 {
  margin: 0;
  max-width: 780px;
  font-size: 64px;
  line-height: 1;
}
h2 {
  margin: 0;
  font-size: 42px;
  line-height: 1.08;
}
h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.2;
}
.lead {
  margin: 24px 0 0;
  max-width: 650px;
  color: var(--muted);
  font-size: 19px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0 24px;
}
.trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  list-style: none;
}
.trust-list li {
  position: relative;
  padding-left: 20px;
  white-space: nowrap;
}
.trust-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 2px;
  background: var(--green);
}
.hero-visual {
  min-width: 0;
}
.terminal-panel {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--terminal-line);
  border-radius: var(--radius);
  background: var(--terminal);
  box-shadow: var(--shadow);
}
.terminal-bar {
  display: grid;
  grid-template-columns: 12px 12px 12px 1fr;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 16px;
  border-bottom: 1px solid var(--terminal-line);
}
.terminal-bar span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #9f9f9f;
}
.terminal-bar strong {
  color: #9f9f9f;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  text-align: center;
}
.terminal-body {
  min-height: 380px;
  padding: 24px;
  color: var(--terminal-ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
}
.terminal-body p {
  margin: 0 0 11px;
}
.terminal-body b {
  color: #d7cfbd;
  margin-right: 8px;
}
.terminal-body em {
  display: inline-block;
  min-width: 88px;
  color: #9dcdb9;
  font-style: normal;
}
.terminal-body .ok {
  color: #8fd2a8;
}
.terminal-body .muted {
  color: #9d9b95;
  text-transform: uppercase;
}
.section {
  padding: 88px 0;
}
.band {
  border-top: 1px solid var(--line);
  background: var(--paper-soft);
}
.section-head {
  max-width: 720px;
}
.section-head p:not(.eyebrow) {
  color: var(--muted);
  margin: 16px 0 0;
  font-size: 18px;
}
.card-grid {
  display: grid;
  gap: 16px;
  margin-top: 38px;
}
.card-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.info-card,
.security-panel,
.metrics-grid article {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}
.info-card {
  padding: 24px;
}
.card-icon {
  display: inline-flex;
  width: 36px;
  height: 28px;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--paper);
  background: var(--ink);
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}
.info-card p {
  margin: 10px 0 0;
  color: var(--muted);
}
.two-col,
.search-layout,
.install-grid,
.proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 54px;
  align-items: start;
}
.flow {
  border-top: 1px solid var(--line);
}
.flow-row {
  display: grid;
  grid-template-columns: 138px 170px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.flow-row span {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}
.flow-row strong {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
}
.flow-row p {
  margin: 0;
  color: var(--ink-soft);
}
.feature-list,
.security-panel ul {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.feature-list li,
.security-panel li {
  position: relative;
  margin: 12px 0;
  padding-left: 22px;
  color: var(--ink-soft);
}
.feature-list li::before,
.security-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 2px;
  background: var(--blue);
}
.diagram {
  display: grid;
  gap: 16px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}
.query,
.formula,
.result {
  justify-self: center;
  padding: 10px 14px;
  border-radius: var(--radius);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
}
.query {
  color: var(--terminal-ink);
  background: var(--terminal);
}
.channels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.channels span {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-soft);
  background: var(--paper-soft);
  text-align: center;
}
.formula {
  color: var(--rust);
  background: #fbebe6;
  border: 1px solid #efc9bf;
}
.result {
  color: var(--green);
  background: #e7f2ee;
  border: 1px solid #bdd8cf;
}
.proof {
  background: var(--ink);
  color: var(--paper);
}
.proof .eyebrow {
  color: #e4a08e;
}
.proof .section-head p:not(.eyebrow) {
  color: #c9c4ba;
}
.demo-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid #343434;
  border-radius: var(--radius);
  background: #000000;
}
.demo-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: contain;
}
.demo-frame figcaption {
  padding: 12px 14px;
  color: #b8b3aa;
  font-size: 13px;
}
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 38px;
}
.metrics-grid article {
  padding: 24px;
}
.metrics-grid span {
  color: var(--muted);
  font-size: 14px;
}
.metrics-grid strong {
  display: block;
  margin-top: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 36px;
  line-height: 1;
}
.metrics-grid p {
  margin: 14px 0 0;
  color: var(--ink-soft);
}
.install-section {
  background: var(--paper);
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}
.tabs button {
  appearance: none;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--paper-soft);
  cursor: pointer;
}
.tabs button[aria-selected="true"] {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}
.code-card {
  position: relative;
  margin-top: 14px;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--terminal);
}
.code-card pre {
  margin: 0;
  padding: 22px 98px 22px 20px;
  color: var(--terminal-ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}
.copy-command {
  position: absolute;
  right: 12px;
  top: 12px;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid #464646;
  border-radius: 6px;
  color: var(--terminal-ink);
  background: #2a2a2a;
  cursor: pointer;
}
.security-panel {
  padding: 26px;
  background: var(--paper-soft);
}
.security-panel h3 {
  font-size: 24px;
}
.final-cta {
  padding: 0 0 88px;
}
.cta-inner {
  padding: 58px 44px;
  border-radius: var(--radius);
  color: var(--paper);
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px 28px),
    var(--ink);
  text-align: center;
}
.cta-inner h2 {
  color: var(--paper);
}
.cta-inner p {
  margin: 14px auto 28px;
  max-width: 620px;
  color: #c9c4ba;
  font-size: 18px;
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.footer {
  padding: 52px 0 28px;
  border-top: 1px solid var(--line);
  background: var(--paper-soft);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
}
.footer p {
  max-width: 300px;
  color: var(--muted);
}
.footer h3 {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
  text-transform: uppercase;
}
.footer a:not(.brand) {
  display: block;
  margin: 9px 0;
  color: var(--ink-soft);
}
.footer a:not(.brand):hover {
  color: var(--ink);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
.reveal {
  opacity: 1;
  transform: none;
}
.js .reveal {
  opacity: 1;
  transform: none;
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}
@media (max-width: 980px) {
  .nav-links {
    display: none;
  }
  .hero-grid,
  .two-col,
  .search-layout,
  .install-grid,
  .proof-grid {
    grid-template-columns: 1fr;
  }
  h1 {
    font-size: 50px;
  }
  h2 {
    font-size: 34px;
  }
  .card-grid.four,
  .metrics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 640px) {
  .shell {
    width: min(100% - 32px, var(--max));
  }
  .nav {
    min-height: 64px;
    gap: 12px;
  }
  .brand {
    font-size: 18px;
  }
  .nav-actions {
    gap: 6px;
  }
  .nav-actions .button span {
    display: none;
  }
  .hero {
    padding: 58px 0 48px;
  }
  .hero-grid {
    gap: 34px;
  }
  h1 {
    font-size: 38px;
    line-height: 1.04;
  }
  h2 {
    font-size: 30px;
  }
  .lead,
  .section-head p:not(.eyebrow),
  .cta-inner p {
    font-size: 17px;
  }
  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }
  .trust-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .trust-list li {
    white-space: normal;
  }
  .terminal-body {
    min-height: 300px;
    padding: 18px;
    font-size: 13px;
  }
  .section {
    padding: 66px 0;
  }
  .card-grid.four,
  .metrics-grid,
  .channels,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .flow-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .code-card pre {
    padding-right: 20px;
    padding-top: 58px;
  }
  .cta-inner {
    padding: 42px 20px;
  }
  .footer-bottom {
    flex-direction: column;
  }
}