:root {
  --c-bg:#FFFFFF;
  --c-panel:#F2F4F6;
  --c-panel-2:#E8EBEE;
  --c-border:#DDE1E5;
  --c-accent:#2C9FE0;
  --c-accent-dark:#1676B3;
  --c-text:#2C3338;
  --c-muted:#6B737A;
  --c-success:#2FA36B;
  --c-warn:#D98E1C;
  --c-error:#D64545;
  --c-on-accent:#FFFFFF;
  --c-line-soft:#ECEFF2;
  --c-dot:#C9CED3;
  --c-notch:#CCD1D6;
  --c-wash-blue:#E2F0FA;
  --c-wash-mist:#EDF1F4;
  --shadow-rgb:44 51 56;
  --accent-rgb:44 159 224;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --r-ctl:6px;
  --r-card:10px;
  --r-phone:24px;
  --r-phone-screen:17px;
  --r-pill:999px;
  --r-round:50%;
  --r-edge:3px;
  --r-line:2px;
  --r-base:1px 1px 14px 14px / 1px 1px 9px 9px;
  --shadow-btn:0 1px 2px rgb(var(--shadow-rgb) / .10),0 8px 18px -10px rgb(var(--accent-rgb) / .70);
  --shadow-lid:0 1px 2px rgb(var(--shadow-rgb) / .05),0 16px 30px -16px rgb(var(--shadow-rgb) / .14),0 44px 80px -36px rgb(var(--shadow-rgb) / .26);
  --shadow-base:inset 0 1px 0 var(--c-bg),0 18px 28px -16px rgb(var(--shadow-rgb) / .34);
  --shadow-win:0 1px 2px rgb(var(--shadow-rgb) / .06),0 18px 40px -20px rgb(var(--shadow-rgb) / .22);
  --shadow-phone:0 1px 2px rgb(var(--shadow-rgb) / .06),0 18px 34px -14px rgb(var(--shadow-rgb) / .20),0 46px 70px -30px rgb(var(--shadow-rgb) / .28);
  --shadow-knob:0 1px 2px rgb(var(--shadow-rgb) / .28);
  --shadow-tab:0 1px 2px rgb(var(--shadow-rgb) / .08);
  --shadow-card:0 1px 2px rgb(var(--shadow-rgb) / .04),0 16px 32px -24px rgb(var(--shadow-rgb) / .18);
  --gutter:60px;
  --width-page:1440px;
  --width-header:1280px;
  --width-reading:800px;
  --header-height:68px;
  --size-body:16px;
  --size-small:14px;
  --size-h1:clamp(34px,3.2vw,46px);
  --size-h2:clamp(28px,3vw,40px);
  --size-h3:22px;
  --weight-body:400;
  --weight-medium:500;
  --weight-strong:700;
  --weight-display:800;
  --section-space:120px;
  --time-fast:150ms;
  --time-reveal:650ms;
  --ease-out:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after { box-sizing:border-box }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:24px }
html.nav-open { overflow:hidden }
body {
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-body);
  font-size:var(--size-body);
  font-weight:var(--weight-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img,svg,video { max-width:100%; vertical-align:middle }
img { height:auto }
svg { flex-shrink:0 }
button,input,select,textarea { font:inherit }
button,a { -webkit-tap-highlight-color:rgb(var(--accent-rgb) / .12) }
button { cursor:pointer }
button:disabled { cursor:not-allowed }
a { color:var(--c-accent-dark); text-underline-offset:4px }
a:hover { text-decoration-thickness:2px }
:focus-visible { outline:2px solid var(--c-accent-dark); outline-offset:4px }
[hidden] { display:none!important }
p { margin:0 }
h1,h2,h3,h4 { margin:0; font-family:var(--font-display); text-wrap:balance }
h1,.h1 { font-size:var(--size-h1); font-weight:var(--weight-display); line-height:1.15; letter-spacing:-.02em }
h2,.h2 { font-size:var(--size-h2); font-weight:var(--weight-display); line-height:1.25; letter-spacing:-.02em }
h3,.h3 { font-size:var(--size-h3); font-weight:var(--weight-strong); line-height:1.4 }
ul,ol { padding-inline-start:1.4em }
code,kbd,pre { font-family:var(--font-mono) }
code { overflow-wrap:anywhere; font-size:.9em }
pre {
  max-width:100%;
  min-width:0;
  overflow-x:auto;
  padding:24px;
  border:1px solid var(--c-border);
  border-radius:var(--r-card);
  background:var(--c-panel);
  color:var(--c-text);
  line-height:1.7;
}
pre code { overflow-wrap:normal; word-break:normal; white-space:pre }
hr { border:0; border-top:1px solid var(--c-border); margin-block:40px }
.wrap { width:100%; max-width:var(--width-page); margin-inline:auto; padding-inline:var(--gutter) }
.reading { width:100%; max-width:calc(var(--width-reading) + var(--gutter) * 2); margin-inline:auto; padding-inline:var(--gutter) }
.section { padding-top:var(--section-space); padding-bottom:var(--section-space) }
.section-panel { background:var(--c-panel); color:var(--c-text) }
.section-head { max-width:760px; margin-bottom:48px }
.section-head p { margin-top:20px; color:var(--c-muted) }
.stack > * + * { margin-top:24px }
.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 > * { min-width:0 }
.nowrap { white-space:nowrap }
.muted { color:var(--c-muted) }
.mono { font-family:var(--font-mono) }
.small { font-size:var(--size-small) }
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip-path:inset(50%); white-space:nowrap; border:0 }
.skip-link { position:fixed; top:8px; left:16px; z-index:50; transform:translateY(-160%); padding:10px 16px; background:var(--c-bg); color:var(--c-accent-dark); border:1px solid var(--c-border); border-radius:var(--r-ctl) }
.skip-link:focus { transform:none }
.prose { min-width:0; overflow-wrap:break-word }
.prose > * + *, .prose section > * + * { margin-top:24px }
.prose h2 { margin-top:64px }
.prose h3 { margin-top:36px }
.prose p,.prose li { line-height:1.9 }
.prose li + li { margin-top:8px }
.prose :is(h2,h3,h4)[id] { scroll-margin-top:32px }
.prose :not(pre) > code { padding:2px 5px; border-radius:var(--r-edge); background:var(--c-panel); color:var(--c-text) }
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  min-height:46px; padding:10px 22px;
  border:1px solid var(--c-border); border-radius:var(--r-ctl);
  background:var(--c-bg); color:var(--c-text);
  font-size:15px; font-weight:600; line-height:1.6; letter-spacing:.01em;
  text-decoration:none; text-align:center;
  transition:background-color var(--time-fast) ease,border-color var(--time-fast) ease,color var(--time-fast) ease;
}
.btn svg { width:16px; height:16px }
.btn-main { background:var(--c-accent); color:var(--c-on-accent); border-color:var(--c-accent); box-shadow:var(--shadow-btn) }
.btn-main:hover,.btn-main.is-hover { background:var(--c-accent-dark); color:var(--c-on-accent); border-color:var(--c-accent-dark); text-decoration:none }
.btn-line { background:var(--c-bg); color:var(--c-accent-dark); border-color:var(--c-accent) }
.btn-line:hover,.btn-line.is-hover { border-color:var(--c-accent-dark); background:var(--c-panel); color:var(--c-accent-dark); text-decoration:none }
.btn:active,.btn.is-active { box-shadow:inset 0 1px 3px rgb(var(--shadow-rgb) / .18) }
.btn.is-focus { outline:2px solid var(--c-accent-dark); outline-offset:4px }
.btn:disabled,.btn[aria-disabled="true"] { background:var(--c-panel-2); color:var(--c-muted); border-color:var(--c-border); box-shadow:none; pointer-events:none }
.cta { display:flex; flex-wrap:wrap; gap:12px; margin-top:32px }
.card,.panel { min-width:0; padding:32px; border:1px solid var(--c-border); border-radius:var(--r-card); background:var(--c-bg); color:var(--c-text); box-shadow:var(--shadow-card) }
.panel { background:var(--c-panel); color:var(--c-text); box-shadow:none }
.card > p,.panel > p { margin-top:16px }
.topbar { position:relative; z-index:30; background:var(--c-bg); color:var(--c-text); border-bottom:1px solid var(--c-line-soft) }
.topbar-in {
  position:relative; width:100%; max-width:min(100%,calc(var(--width-header) + var(--gutter) * 2));
  min-height:var(--header-height); margin-inline:auto; padding-inline:var(--gutter);
  display:flex; align-items:center; justify-content:space-between; gap:24px;
}
.brand { display:inline-flex; align-items:center; gap:11px; flex-shrink:0; font-family:var(--font-display); font-weight:700; font-size:17px; letter-spacing:-.01em; color:var(--c-text); text-decoration:none }
.brand img { display:block; width:32px; height:32px; flex-shrink:0 }
.desktop-nav { min-width:0; margin-left:auto }
.nav { display:flex; align-items:center; gap:34px; list-style:none; margin:0; padding:0 }
.nav a { display:block; padding-block:16px; font-size:15px; font-weight:500; color:var(--c-muted); text-decoration:none; white-space:nowrap; transition:color var(--time-fast) ease }
.nav a:hover,.nav a[aria-current="page"] { color:var(--c-text) }
.nav a[aria-current="page"] { font-weight:700 }
.header-tools { display:flex; align-items:center; gap:8px; flex-shrink:0; margin-left:20px }
.language-picker { position:relative }
.lang { display:inline-flex; align-items:center; justify-content:center; gap:5px; min-height:44px; padding:0; border:0; background:var(--c-bg); color:var(--c-muted); font-size:14px; font-weight:500; white-space:nowrap }
.lang-short { display:none }
.language-menu { position:absolute; right:0; top:calc(100% + 8px); width:180px; padding:8px; list-style:none; margin:0; background:var(--c-bg); color:var(--c-text); border:1px solid var(--c-border); border-radius:var(--r-card); box-shadow:var(--shadow-win) }
.language-menu a { display:flex; align-items:center; min-height:44px; padding:8px 12px; color:var(--c-text); text-decoration:none; border-radius:var(--r-ctl) }
.language-menu a:hover,.language-menu a[aria-current="true"] { background:var(--c-panel); color:var(--c-accent-dark) }
.menu-toggle { display:none; align-items:center; justify-content:center; min-width:44px; min-height:44px; border:0; border-radius:var(--r-ctl); background:var(--c-bg); color:var(--c-text) }
.menu-toggle svg { width:22px; height:22px }
.mobile-drawer { display:none }
.nav-veil { position:fixed; inset:var(--header-height) 0 0; z-index:20; border:0; background:rgb(var(--shadow-rgb) / .18); color:var(--c-text) }
.footer { background:var(--c-panel); color:var(--c-text); padding-top:80px; padding-bottom:32px }
.footer-grid { display:grid; grid-template-columns:1.6fr 1fr 1.2fr 1fr; gap:48px }
.footer-brand p { max-width:330px; margin-top:20px; color:var(--c-muted); font-size:14px; line-height:1.8 }
.footer h2 { font-size:14px; font-weight:700; letter-spacing:0; margin-bottom:18px }
.footer ul { list-style:none; padding:0; margin:0 }
.footer li + li { margin-top:10px }
.footer a:not(.brand) { color:var(--c-muted); font-size:14px; text-decoration:none }
.footer a:hover { color:var(--c-accent-dark) }
.footer-bottom { display:flex; flex-wrap:wrap; justify-content:space-between; gap:16px; margin-top:64px; padding-top:24px; border-top:1px solid var(--c-border); color:var(--c-muted); font-size:13px }
.reveal { opacity:1; transform:none }
.reveal-pending { opacity:0; transform:translateY(16px); transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out) }
.reveal.shown { opacity:1; transform:none }
.hero { position:relative; z-index:2; padding-top:72px; overflow-x:clip }
.hero-grid { display:grid; grid-template-columns:440px 1fr; column-gap:40px; align-items:center }
.hero-copy { max-width:440px }
.hero .h1 { margin:24px 0 0 }
.lede { margin-top:20px; font-size:16.5px; line-height:1.72; color:var(--c-muted) }
.lede strong { color:var(--c-text); font-weight:600 }
.pill { display:inline-flex; align-items:center; gap:9px; min-height:30px; max-width:100%; padding:4px 13px 4px 11px; border:1px solid var(--c-border); border-radius:var(--r-pill); background:var(--c-bg); color:var(--c-muted); font-size:13px; font-weight:500; line-height:20px; letter-spacing:.01em }
.pill-dot { width:7px; height:7px; flex-shrink:0; border-radius:var(--r-round); background:var(--c-accent); color:var(--c-text) }
.plats { display:flex; flex-wrap:wrap; gap:8px; margin:28px 0 0; padding:0; list-style:none }
.chip { display:inline-flex; align-items:center; gap:7px; min-height:32px; max-width:100%; padding:4px 12px 4px 10px; border:1px solid var(--c-border); border-radius:var(--r-ctl); background:var(--c-bg); color:var(--c-text); font-size:13px; font-weight:500; text-decoration:none; overflow-wrap:anywhere }
.chip svg { width:15px; height:15px; color:var(--c-muted) }
.chip .tux { width:13px }
.chip:hover { border-color:var(--c-accent); text-decoration:none }
.band { position:relative; z-index:1; margin-top:-64px; padding-top:140px; padding-bottom:120px; background:var(--c-panel); color:var(--c-text) }
.band-row { display:flex; flex-wrap:wrap; align-items:center; justify-content:center; gap:16px 0 }
.band-group { display:flex; align-items:center; gap:34px }
.band-key { font-size:13px; font-weight:600; color:var(--c-muted); letter-spacing:.04em }
.band-group ul { display:flex; flex-wrap:wrap; align-items:center; gap:34px; list-style:none; margin:0; padding:0 }
.band-group li { font-family:var(--font-mono); font-size:15px; font-weight:600; color:var(--c-muted); letter-spacing:-.01em }
.band-sep { width:1px; height:20px; margin-inline:44px; background:var(--c-border); color:var(--c-text) }
@media (max-width:1360px) {
  .hero-grid { grid-template-columns:minmax(0,1fr); justify-items:center; row-gap:64px }
  .hero-copy { max-width:640px; text-align:center }
  .cta,.plats { justify-content:center }
  .topbar .nav { gap:24px }
}
@media (max-width:1100px) {
  .desktop-nav { display:none }
  .header-tools { margin-left:auto }
  .menu-toggle { display:inline-flex }
  .mobile-drawer:not([hidden]) { display:block; position:absolute; top:100%; left:0; right:0; padding:16px var(--gutter) 24px; max-height:calc(100dvh - var(--header-height)); overflow-y:auto; overscroll-behavior:contain; background:var(--c-bg); color:var(--c-text); border-bottom:1px solid var(--c-border) }
  .mobile-drawer ul { display:block; list-style:none; margin:0; padding:0 }
  .mobile-drawer a { display:flex; align-items:center; width:100%; min-height:44px; padding:10px 12px; color:var(--c-text); text-decoration:none; border-radius:var(--r-ctl) }
  .mobile-drawer a:hover,.mobile-drawer a[aria-current] { background:var(--c-panel); color:var(--c-accent-dark) }
  .drawer-languages { margin-top:16px; padding-top:16px; border-top:1px solid var(--c-border) }
}
@media (max-width:960px) {
  :root { --gutter:24px; --section-space:80px }
  .hero { padding-top:48px }
  .footer-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:40px }
  .band { margin-top:-96px; padding-top:136px; padding-bottom:72px }
  .band-sep { display:none }
  .band-row { flex-direction:column; gap:18px }
  .band-group { flex-direction:column; gap:12px }
  .band-group ul { justify-content:center; gap:12px 22px }
  .grid-three { grid-template-columns:repeat(2,minmax(0,1fr)) }
}
@media (max-width:768px) {
  :root { --size-h1:clamp(24px,4vw,30px); --size-h2:28px; --size-h3:20px }
}
@media (max-width:640px) {
  :root { --gutter:20px; --section-space:64px }
  .topbar-in { gap:8px }
  .brand { font-size:14px; gap:8px }
  .brand img { width:28px; height:28px }
  .lang-full { display:none }
  .lang-short { display:inline }
  .header-tools { margin-left:auto; gap:4px }
  .lang { min-width:38px }
  .grid-two,.grid-three,.footer-grid { grid-template-columns:minmax(0,1fr) }
  .card,.panel { padding:24px }
  .hero-grid { row-gap:48px }
  .hero .h1 { margin-top:22px }
  .lede { font-size:15px }
  .pill { font-size:11px; gap:6px; padding-inline:9px }
  .plats { justify-content:center; flex-direction:row; flex-wrap:wrap }
  .cta { gap:10px; margin-top:24px }
  .btn { padding-inline:18px }
  .tilt,[data-tilt] { transform:none!important }
  .footer { padding-top:56px }
  .footer-bottom { margin-top:40px }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto }
  *,*::before,*::after { animation:none!important; transition:none!important }
  .reveal-pending { opacity:1; transform:none }
}
@media print {
  .header-tools,.mobile-drawer,.nav-veil,.dl-fab { display:none!important }
  .reveal-pending { opacity:1; transform:none }
}