:root {
  color-scheme: light;
  --ink: #192327;
  --muted: #59666b;
  --paper: #f9fafb;
  --line: #dde3e5;
  --accent: #b8261c;
  --accent-hover: #942016;
  --dark: #152b32;
  --radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}
a,
summary {
  touch-action: manipulation;
}
a:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
  border-radius: 4px;
}
::selection {
  color: #fff;
  background: var(--accent);
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
h1,
h2,
h3 {
  text-wrap: balance;
}
p {
  text-wrap: pretty;
}
.container {
  width: min(1160px, calc(100% - 80px));
  margin-inline: auto;
}
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  padding: 8px 20px;
  background: white;
  z-index: 10;
}
.skip-link:focus {
  top: 12px;
}
.header {
  border-bottom: 1px solid var(--line);
  background: rgba(249, 250, 251, 0.97);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.6px;
}
.brand-cn {
  border-left: 1px solid #c9d1d4;
  padding-left: 10px;
  margin-left: 7px;
  font-weight: 500;
  font-size: 18px;
}
.header nav {
  display: flex;
  gap: 32px;
  font-size: 14px;
  color: var(--muted);
}
.header a:hover,
.footer a:hover {
  color: var(--accent);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
}
.header-github {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 14px;
}
.header-github span {
  padding-left: 10px;
}
.hero {
  text-align: center;
  padding-top: 76px;
}
.eyebrow {
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.15em;
  line-height: 1.5;
}
.hero .eyebrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--muted);
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px #b8261c0c;
}
h1 {
  margin-top: 26px;
  font-size: clamp(46px, 5.8vw, 78px);
  line-height: 1.23;
  letter-spacing: -0.06em;
  font-weight: 750;
}
h1 span {
  color: var(--accent);
}
.hero-intro {
  margin: 26px auto 0;
  color: var(--muted);
  line-height: 1.9;
  font-size: 18px;
}
.hero-actions {
  margin-top: 30px;
  display: flex;
  justify-content: center;
  gap: 12px;
}
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 12px 23px;
  border: 1px solid transparent;
  border-radius: 7px;
  font-size: 15px;
  font-weight: 600;
  transition:
    background 0.18s,
    transform 0.18s;
}
.button:hover {
  transform: translateY(-2px);
}
.button svg {
  width: 21px;
  height: 21px;
}
.button > span {
  margin-left: 8px;
  font-size: 20px;
  line-height: 1;
  font-weight: 400;
}
.button-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 3px 0 #8b201820;
}
.button-primary:hover {
  background: var(--accent-hover);
}
.button-secondary {
  background: white;
  border-color: var(--line);
}
.button-secondary:hover {
  background: #edf0f2;
}
.install-note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 13px;
  letter-spacing: 0.035em;
}
.explore {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  margin-top: 40px;
  font-size: 13px;
  color: var(--muted);
}
.explore span {
  color: var(--accent);
}
.hero-preview {
  margin: 32px auto 0;
  max-width: 1010px;
  border-radius: 12px 12px 0 0;
  overflow: hidden;
  border: 1px solid #cfd8dc;
  border-bottom: 0;
  box-shadow: 0 16px 70px #2135400c;
}
.window-bar {
  height: 37px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: #edf1f3;
  border-bottom: 1px solid #dce3e5;
  color: #626d73;
  font-size: 12px;
}
.window-dots {
  letter-spacing: 3px;
  font-size: 9px;
  color: #a7b3b9;
}
.hero-preview img {
  width: 100%;
}
.benefit-strip {
  border-block: 1px solid var(--line);
  background: white;
}
.benefit-strip .container {
  display: flex;
  justify-content: space-around;
  padding-block: 22px;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
}
.check {
  margin-right: 12px;
  color: var(--accent);
}
.section {
  padding-block: 108px;
}
.section-heading {
  max-width: 760px;
}
h2 {
  font-size: clamp(30px, 3.4vw, 44px);
  line-height: 1.35;
  letter-spacing: -0.04em;
  font-weight: 650;
  margin-top: 18px;
}
.section-heading > p:last-child:not(.eyebrow) {
  margin-top: 18px;
  color: var(--muted);
}
.section-heading .eyebrow,
.engine-heading .eyebrow,
.faq-section .eyebrow {
  color: var(--accent);
}
.experience-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 42px;
  border-bottom: 1px solid var(--line);
  gap: 24px;
}
.experience-tab {
  display: flex;
  align-items: center;
  padding: 16px 2px;
  gap: 12px;
  font-size: 16px;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--muted);
}
.experience-tab:hover {
  color: var(--accent);
}
.experience-tab[aria-selected='true'] {
  color: var(--accent);
  border-color: var(--accent);
}
.tab-number {
  font:
    12px ui-monospace,
    monospace;
  opacity: 0.75;
}
.tab-arrow {
  margin-left: auto;
}
.experience-panel {
  display: grid;
  grid-template-columns: 0.75fr 1.4fr;
  gap: 52px;
  align-items: center;
  padding-top: 38px;
}
[hidden] {
  display: none !important;
}
.feature-index {
  display: inline-block;
  font:
    14px ui-monospace,
    monospace;
  color: var(--accent);
  border: 1px solid #d6dbde;
  padding: 5px 8px;
  margin-bottom: 20px;
}
h3 {
  font-size: 24px;
  line-height: 1.5;
  letter-spacing: -0.025em;
  font-weight: 650;
}
.panel-copy > p {
  margin-top: 18px;
  color: var(--muted);
}
.shortcut {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 8px;
  margin-top: 25px;
  font-size: 13px;
  color: var(--muted);
}
kbd {
  display: inline-block;
  background: white;
  border: 1px solid #cfd7da;
  box-shadow: 0 2px 0 #d9e0e3;
  padding: 3px 11px;
  border-radius: 5px;
  color: var(--ink);
  font:
    13px/1.7 ui-monospace,
    monospace;
}
.experience-panel figure {
  min-width: 0;
}
.experience-panel img {
  width: 100%;
  border: 1px solid #dde1e2;
  border-radius: 10px;
}
figcaption {
  text-align: right;
  margin-top: 12px;
  font-size: 12px;
  color: var(--muted);
}
.engine-section {
  padding-block: 90px;
  background: #edf2f4;
  border-block: 1px solid #e0e7ea;
}
.engine-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 100px;
  align-items: start;
}
.engine-heading {
  padding-top: 14px;
}
.engine-heading > p:not(.eyebrow) {
  color: var(--muted);
  margin-top: 24px;
  max-width: 350px;
}
.text-link {
  display: inline-flex;
  gap: 20px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  margin-top: 28px;
}
.text-link:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}
.engine-basic,
.engine-ai {
  padding: 28px 30px;
  border-radius: var(--radius);
}
.engine-basic {
  background: #fff;
  border: 1px solid #dce4e7;
}
.option-top {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.09em;
}
.option-marker {
  display: grid;
  place-items: center;
  height: 23px;
  width: 23px;
  border: 1px solid currentColor;
  border-radius: 50%;
  font:
    11px ui-monospace,
    monospace;
}
.engine-options h3 {
  margin-top: 15px;
}
.engine-options article > p {
  margin-top: 12px;
  color: var(--muted);
}
.engine-ai {
  margin-top: 14px;
  background: var(--dark);
  color: #fff;
}
.engine-ai .option-top {
  color: #b9cbd2;
}
.engine-options .engine-ai > p {
  color: #c1d0d5;
}
.providers {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.providers span {
  padding: 5px 12px;
  border: 1px solid #4a5f66;
  border-radius: 4px;
  font-size: 13px;
}
.engine-options .small {
  font-size: 13px;
  margin-top: 20px;
}
.engine-note {
  color: var(--muted);
  font-size: 12px;
  margin-top: 16px;
}
.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 45px;
  margin-top: 42px;
}
.trust-grid article {
  border-top: 1px solid var(--line);
  padding-top: 27px;
}
.trust-symbol {
  display: block;
  height: 50px;
  color: var(--accent);
  font:
    26px ui-monospace,
    monospace;
}
.trust-grid h3 {
  font-size: 20px;
}
.trust-grid p {
  margin-top: 12px;
  color: var(--muted);
}
.faq-section {
  display: grid;
  grid-template-columns: 0.8fr 1.4fr;
  gap: 65px;
  border-top: 1px solid var(--line);
  padding-block: 76px 110px;
}
.faq-list details {
  border-bottom: 1px solid var(--line);
}
.faq-list details:first-child {
  border-top: 1px solid var(--line);
}
summary {
  display: flex;
  justify-content: space-between;
  gap: 25px;
  cursor: pointer;
  padding-block: 21px;
  font-size: 16px;
  font-weight: 550;
  list-style: none;
}
summary::-webkit-details-marker {
  display: none;
}
summary:hover {
  color: var(--accent);
}
.faq-plus {
  font-size: 22px;
  font-weight: 400;
  line-height: 1.3;
  color: var(--muted);
  flex-shrink: 0;
  transition: transform 0.2s;
}
details[open] .faq-plus {
  transform: rotate(45deg);
  color: var(--accent);
}
details p {
  padding: 0 30px 23px 0;
  color: var(--muted);
  font-size: 15px;
}
.closing {
  background: var(--dark);
  color: white;
}
.closing-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 45px;
  padding-block: 76px;
}
.closing .eyebrow {
  color: #b4c6ce;
}
.closing h2 {
  margin-top: 22px;
  font-size: clamp(30px, 3.4vw, 43px);
}
.closing p:not(.eyebrow) {
  margin-top: 20px;
  color: #b4c6ce;
}
.closing .button {
  background: #fff;
  color: var(--dark);
}
.closing .button:hover {
  background: #e9eff2;
}
.closing .install-note {
  max-width: 290px;
  font-size: 12px;
}
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 40px;
  gap: 30px;
}
.footer .brand {
  font-size: 18px;
}
.footer .brand-cn {
  font-size: 16px;
}
.footer p {
  font-size: 12px;
  margin-top: 8px;
  color: var(--muted);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 25px;
  font-size: 13px;
}
.footer-links a span {
  margin-left: 5px;
}
.license {
  color: var(--muted);
}
@media (min-width: 1600px) {
  .hero {
    padding-top: 95px;
  }
}
@media (max-width: 1000px) {
  .header nav {
    gap: 20px;
  }
  .container {
    width: calc(100% - 48px);
  }
  .engine-layout {
    gap: 45px;
  }
  .experience-panel {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 25px;
  }
  .trust-grid {
    gap: 28px;
  }
  .faq-section {
    gap: 35px;
  }
  .footer {
    align-items: flex-start;
  }
  .footer-links {
    gap: 18px;
  }
}
@media (max-width: 760px) {
  .header-inner {
    min-height: 74px;
    gap: 15px;
  }
  .header nav {
    display: none;
  }
  .header-actions {
    gap: 14px;
  }
  .brand {
    font-size: 19px;
  }
  .brand-cn {
    font-size: 16px;
  }
  .hero {
    padding-top: 55px;
  }
  h1 {
    font-size: clamp(37px, 7.5vw, 57px);
    letter-spacing: -0.05em;
  }
  .hero-intro {
    font-size: 16px;
  }
  .hero-preview {
    margin-top: 26px;
  }
  .benefit-strip .container {
    justify-content: space-between;
    gap: 12px;
    font-size: 12px;
  }
  .check {
    margin-right: 5px;
  }
  .section {
    padding-block: 70px;
  }
  .experience-tabs {
    gap: 14px;
    margin-top: 26px;
  }
  .experience-tab {
    gap: 8px;
    font-size: 14px;
  }
  .tab-arrow {
    display: none;
  }
  .experience-panel {
    grid-template-columns: 1fr;
    gap: 25px;
    padding-top: 28px;
  }
  .panel-copy {
    max-width: 550px;
  }
  .feature-index {
    display: none;
  }
  .panel-copy h3 {
    font-size: 23px;
  }
  .shortcut {
    flex-direction: row;
    align-items: center;
    gap: 13px;
    margin-top: 20px;
  }
  .engine-section {
    padding-block: 60px;
  }
  .engine-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .engine-heading > p:not(.eyebrow) {
    max-width: 550px;
  }
  .trust-grid {
    grid-template-columns: 1fr;
    gap: 30px;
    margin-top: 30px;
  }
  .trust-grid article {
    padding-top: 20px;
  }
  .trust-symbol {
    height: 42px;
  }
  .faq-section {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-block: 55px 70px;
  }
  .closing-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 32px;
    padding-block: 55px;
  }
  .closing .install-note {
    max-width: none;
  }
  .footer {
    flex-direction: column;
    gap: 23px;
  }
  .footer-links {
    justify-content: flex-start;
  }
}
@media (max-width: 420px) {
  .container {
    width: calc(100% - 32px);
  }
  .header-github {
    display: none;
  }
  .hero .eyebrow {
    font-size: 12px;
    letter-spacing: 0.08em;
  }
  .hero-actions {
    flex-direction: column;
    max-width: 300px;
    margin-inline: auto;
  }
  .hero-intro br {
    display: none;
  }
  .hero .install-note {
    font-size: 12px;
  }
  .benefit-strip .container {
    flex-direction: column;
    align-items: center;
    gap: 7px;
    padding-block: 17px;
    font-size: 13px;
  }
  .experience-tab {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    font-size: 13px;
  }
  .engine-basic,
  .engine-ai {
    padding: 23px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
  }
  .button:hover {
    transform: none;
  }
}