:root {
  --c-bg:#FFFFFF;
  --c-panel:#F7F6F4;
  --c-panel-2:#EFEDEA;
  --c-border:#E7E4DF;
  --c-border-strong:#DAD6CF;
  --c-accent:#F7731A;
  --c-accent-2:#E8483A;
  --c-accent-dark:#C9520C;
  --c-accent-soft:#FDEDE2;
  --c-text:#1F1E24;
  --c-muted:#6B6872;
  --c-faint:#9C99A2;
  --c-success:#2FA65A;
  --c-success-ring:rgba(47,166,90,.35);
  --c-warn:#D98A0B;
  --c-error:#E5484D;
  --c-on-accent:#FFFFFF;
  --c-glass:rgba(255,255,255,.58);
  --c-glass-line:rgba(255,255,255,.9);
  --c-clear:rgba(255,255,255,0);
  --c-veil:rgba(31,30,36,.24);
  --grad-brand:linear-gradient(100deg,var(--c-accent) 0%,var(--c-accent-2) 100%);
  --glow-core:rgba(247,115,26,.30);
  --glow-mid:rgba(232,72,58,.13);
  --glow-edge:rgba(247,115,26,.05);
  --shadow-near:0 1px 2px rgba(31,30,36,.05),0 2px 6px rgba(31,30,36,.04);
  --shadow-mid:0 20px 44px -18px rgba(31,30,36,.16);
  --shadow-far:0 64px 120px -36px rgba(201,82,12,.26);
  --shadow-cta:0 12px 26px -10px rgba(232,72,58,.55);
  --shadow-chip:0 1px 2px rgba(31,30,36,.06);
  --shadow-menu:0 2px 4px rgba(31,30,36,.05),0 24px 48px -16px rgba(31,30,36,.22);
  --r-shell:38px;
  --r-win:28px;
  --r-xl:24px;
  --r-lg:16px;
  --r-md:12px;
  --r-sm:8px;
  --r-mark:10px;
  --r-tiny:2px;
  --r-pill:999px;
  --r-round:50%;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"Cascadia Code",Consolas,"Noto Sans SC",monospace;
  --nav-h:72px;
  --peek:40px;
  --wrap:1248px;
  --header-wrap:1280px;
  --read-wrap:800px;
  --gutter:48px;
  --space-section:96px;
  --motion-fast:200ms;
  --motion-reveal:600ms;
  --ease-out:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after {box-sizing:border-box;}
html {scroll-behavior:smooth;scroll-padding-top:24px;}
html,body {margin:0;padding:0;}
html.nav-open {overflow:hidden;}
body {
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--f-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
[hidden] {display:none !important;}
a {color:inherit;text-decoration:none;}
button,input,select,textarea {font:inherit;}
button {cursor:pointer;}
button {background:var(--c-bg);color:var(--c-text);}
img,svg {display:block;max-width:100%;}
img {height:auto;}
svg {flex-shrink:0;}
button svg,a svg {pointer-events:none;}
:focus-visible {outline:2px solid var(--c-accent-dark);outline-offset:4px;}
::selection {background:var(--c-accent-soft);color:var(--c-text);}
h1,h2,h3,h4 {font-family:var(--f-display);line-height:1.25;text-wrap:balance;}
h1 {font-size:clamp(34px,3.3vw,48px);font-weight:800;letter-spacing:-.02em;}
h2 {font-size:clamp(26px,2.8vw,38px);font-weight:750;letter-spacing:-.015em;}
h3 {font-size:22px;font-weight:700;}
p {margin:0 0 1.2em;}
h1,h2,h3 {margin-top:0;}
code,kbd,pre {font-family:var(--f-mono);}
code {font-size:.9em;overflow-wrap:anywhere;}
pre {
  max-width:100%;min-width:0;overflow-x:auto;
  padding:22px;border:1px solid var(--c-border);border-radius:var(--r-lg);
  background:var(--c-panel);color:var(--c-text);
  font-size:13px;line-height:1.8;tab-size:2;
}
pre code {font-size:inherit;white-space:pre;overflow-wrap:normal;word-break:normal;}
hr {border:0;border-top:1px solid var(--c-border);margin-block:32px;}
.wrap,.reading-wrap,.header-wrap {
  width:100%;margin-inline:auto;padding-inline:var(--gutter);
}
.wrap {max-width:calc(var(--wrap) + var(--gutter) * 2);}
.reading-wrap {max-width:calc(var(--read-wrap) + var(--gutter) * 2);}
.header-wrap {max-width:min(100%,calc(var(--header-wrap) + var(--gutter) * 2));}
.section {padding-top:var(--space-section);padding-bottom:var(--space-section);}
.clip-x,.decorated-section {overflow-x:hidden;overflow-x:clip;}
.grid {display:grid;gap:24px;}
.grid-two {grid-template-columns:repeat(2,minmax(0,1fr));}
.grid-three {grid-template-columns:repeat(3,minmax(0,1fr));}
.grid > *,.hero-grid > *,.footer-grid > *,.feature-browser > * {min-width:0;}
.nowrap {white-space:nowrap;}
.muted {color:var(--c-muted);}
.mono {font-family:var(--f-mono);}
.ink {
  background:var(--grad-brand);color:var(--c-accent-dark);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.text-link,.prose a:not(.btn-main):not(.btn-ghost) {
  color:var(--c-text);text-decoration:underline;text-decoration-color:var(--c-accent);
  text-decoration-thickness:1.5px;text-underline-offset:4px;
}
.text-link:hover,.prose a:hover {text-decoration-color:var(--c-accent-2);}
.section-heading {margin-bottom:40px;}
.section-heading.center {text-align:center;}
.section-heading p {color:var(--c-muted);max-width:650px;margin-inline:auto;}
.panel,.card {
  border:1px solid var(--c-border);border-radius:var(--r-xl);
  background:var(--c-bg);color:var(--c-text);
  box-shadow:var(--shadow-near),var(--shadow-mid);
  padding:32px;min-width:0;
}
.panel {background:var(--c-panel);color:var(--c-text);border-radius:var(--r-win);box-shadow:var(--shadow-near);}
.card h3,.panel h3 {margin-bottom:12px;}
.card p:last-child,.panel p:last-child {margin-bottom:0;}
.prose {min-width:0;line-height:1.85;}
.prose h2 {margin-top:2.4em;margin-bottom:.8em;}
.prose h3 {margin-top:1.8em;margin-bottom:.7em;}
.prose li {margin-block:.5em;}
.prose :is(h2,h3,h4),[id] {scroll-margin-top:28px;}
.prose blockquote {margin-inline:0;}
.prose > :first-child {margin-top:0;}
.cta,.button-row {display:flex;align-items:center;flex-wrap:wrap;gap:14px;}
.cta {margin-top:32px;}
.btn-main,.btn-ghost {
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:52px;padding:10px 26px;border-radius:var(--r-pill);
  font-size:16px;font-weight:700;letter-spacing:.005em;line-height:1.4;
  border:1px solid var(--c-clear);text-align:center;
  transition:transform var(--motion-fast) ease,box-shadow var(--motion-fast) ease,border-color var(--motion-fast) ease;
}
.btn-main {background:var(--grad-brand);color:var(--c-on-accent);box-shadow:var(--shadow-cta);}
.btn-main svg {width:18px;height:18px;}
.btn-main:hover,.btn-main.is-hover {transform:translateY(-1px);}
.btn-main:active,.btn-main.is-pressed {transform:translateY(1px);box-shadow:var(--shadow-chip);}
.btn-ghost {
  background:var(--c-bg);color:var(--c-text);border-color:var(--c-border-strong);
  font-weight:600;padding-inline:22px;
}
.btn-ghost:hover,.btn-ghost.is-hover {border-color:var(--c-text);}
.btn-ghost .arw {color:var(--c-muted);transition:transform var(--motion-fast) ease;}
.btn-ghost:hover .arw {transform:translateX(3px);}
.btn-main:disabled,.btn-ghost:disabled,[aria-disabled="true"] {
  background:var(--c-panel-2);color:var(--c-muted);border-color:var(--c-border);
  box-shadow:none;cursor:not-allowed;transform:none;
}
.is-focus {outline:2px solid var(--c-accent-dark);outline-offset:4px;}
.topbar,#site-header {position:relative;z-index:50;min-height:var(--nav-h);}
.header-row {height:var(--nav-h);display:flex;align-items:center;gap:24px;}
.brand {
  display:inline-flex;align-items:center;gap:11px;flex-shrink:0;
  font-family:var(--f-display);font-weight:700;font-size:17px;letter-spacing:-.01em;
}
.brand img {width:34px;height:34px;flex-shrink:0;}
.menu {display:flex;align-items:center;min-width:0;margin-left:auto;}
.menu ul {
  display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:4px;
}
.menu a {
  display:block;padding:8px 13px;font-size:15px;font-weight:500;
  color:var(--c-muted);white-space:nowrap;
  transition:color var(--motion-fast) ease;
}
.menu a:hover {color:var(--c-text);}
.menu a[aria-current="page"] {color:var(--c-text);font-weight:700;}
.header-tools {display:flex;align-items:center;gap:8px;flex-shrink:0;}
.language-picker {position:relative;}
.lang {
  display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:44px;
  padding:8px 0 8px 22px;border:0;border-left:1px solid var(--c-border);
  background:var(--c-bg);color:var(--c-text);font-size:14px;font-weight:500;white-space:nowrap;
}
.lang-caret {color:var(--c-muted);font-size:11px;}
.lang-short {display:none;}
.language-popover {
  position:absolute;top:calc(100% + 8px);right:0;width:190px;padding:6px;
  border:1px solid var(--c-border);border-radius:var(--r-lg);
  background:var(--c-bg);color:var(--c-text);box-shadow:var(--shadow-menu);z-index:4;
}
.language-popover a {display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);}
.language-popover a:hover,.language-popover [aria-current] {background:var(--c-panel);color:var(--c-text);}
.hamburger {
  display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;
  border:1px solid var(--c-border);border-radius:var(--r-md);
  background:var(--c-bg);color:var(--c-text);
}
.hamburger svg {width:20px;height:20px;}
.mobile-drawer {
  position:absolute;top:var(--nav-h);left:0;right:0;z-index:3;
  padding:16px var(--gutter) 24px;border-bottom:1px solid var(--c-border);
  max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;
  background:var(--c-bg);color:var(--c-text);box-shadow:var(--shadow-mid);
}
.mobile-drawer ul {list-style:none;margin:0;padding:0;}
.mobile-drawer a {display:flex;align-items:center;width:100%;min-height:46px;padding:11px 12px;}
.mobile-drawer a:hover,.mobile-drawer a[aria-current] {background:var(--c-panel);color:var(--c-text);font-weight:700;}
.drawer-languages {border-top:1px solid var(--c-border);margin-top:12px;padding-top:12px;}
.nav-veil {position:fixed;inset:var(--nav-h) 0 0;z-index:1;background:var(--c-veil);color:var(--c-text);border:0;width:100%;cursor:default;}
.mobile-drawer,.header-tools,.brand,.menu {position:relative;z-index:3;}
.mobile-drawer {position:absolute;}
.site-footer {
  border-top:1px solid var(--c-border);background:var(--c-panel);color:var(--c-text);
  padding-top:64px;padding-bottom:96px;
}
.footer-grid {display:grid;grid-template-columns:1.3fr 1fr 1.3fr .8fr;gap:44px;}
.footer-brand p {font-size:14px;color:var(--c-muted);margin-top:20px;max-width:310px;}
.site-footer h2 {font-size:14px;margin:0 0 16px;font-weight:700;}
.site-footer ul {list-style:none;padding:0;margin:0;display:grid;gap:6px;}
.site-footer li a {display:inline-block;padding-block:4px;font-size:14px;color:var(--c-muted);}
.site-footer a:hover {color:var(--c-text);text-decoration:underline;text-decoration-color:var(--c-accent);text-underline-offset:4px;}
.footer-bottom {
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:48px;padding-top:24px;border-top:1px solid var(--c-border);font-size:13px;color:var(--c-muted);
}
.reveal {opacity:1;transform:none;}
.reveal-pending {opacity:0;transform:translateY(18px);transition:opacity var(--motion-reveal) var(--ease-out),transform var(--motion-reveal) var(--ease-out);}
.reveal.shown {opacity:1;transform:none;}
.skip-link {position:absolute;top:8px;left:var(--gutter);z-index:100;padding:10px 16px;background:var(--c-bg);color:var(--c-text);border:1px solid var(--c-border);transform:translateY(-160%);}
.skip-link:focus {transform:none;}
@media (max-width:1280px) {
  .menu a {padding-inline:9px;font-size:14px;}
  .header-row {gap:16px;}
}
@media (max-width:1160px) {
  .menu {display:none;}
  .header-tools {margin-left:auto;}
  .hamburger {display:inline-flex;}
  .footer-grid {grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (min-width:1161px) {
  .mobile-drawer,.nav-veil {display:none !important;}
}
@media (max-width:768px) {
  :root {--gutter:24px;--space-section:64px;}
  h1 {font-size:clamp(24px,4.6vw,30px);}
  .grid-three {grid-template-columns:1fr;}
}
@media (max-width:640px) {
  :root {--gutter:20px;}
  .header-row {gap:8px;}
  .brand {gap:8px;font-size:14px;}
  .brand img {width:30px;height:30px;}
  .lang {padding-inline:6px;border-left:0;}
  .lang-full {display:none;}
  .lang-short {display:inline;}
  .grid-two,.footer-grid {grid-template-columns:1fr;}
  .card,.panel {padding:24px;}
  .btn-main,.btn-ghost {min-height:48px;font-size:15px;padding-inline:20px;}
  .tilt,.tilt-card {transform:none !important;}
  .footer-grid {gap:32px;}
  .footer-bottom {align-items:flex-start;flex-direction:column;}
  pre {padding:16px;}
}
@media (prefers-reduced-motion:reduce) {
  html {scroll-behavior:auto;}
  *,*::before,*::after {animation:none !important;transition:none !important;}
  .reveal,.reveal-pending {opacity:1;transform:none;}
}