:root{
  --color-page:#FFFFFF;
  --color-panel:#F8F7F4;
  --color-panel-strong:#F1EFEB;
  --color-line:#E7E4DF;
  --color-brand:#F5793B;
  --color-brand-deep:#D95A1F;
  --color-route:#7A9BC4;
  --color-ink:#1E1C19;
  --color-muted:#6F6A63;
  --color-success:#2FA36B;
  --color-warning:#E8A13C;
  --color-danger:#D9534A;
  --color-white:#FFFFFF;
  --color-focus:#D95A1F;
  --color-overlay:rgba(30,28,25,.28);
  --color-brand-soft:rgba(245,121,59,.12);
  --color-route-soft:rgba(122,155,196,.16);
  --color-success-soft:rgba(47,163,107,.12);
  --color-danger-soft:rgba(217,83,74,.1);
  --color-shadow:rgba(30,28,25,.12);
  --color-brand-shadow:rgba(217,90,31,.35);
  --font-display:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',-apple-system,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',-apple-system,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,'Courier New',monospace;
  --radius-xs:6px;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-pill:999px;
  --shadow-window:0 1px 2px rgba(30,28,25,.06),0 18px 44px -18px rgba(217,90,31,.24),0 52px 110px -44px rgba(217,90,31,.18);
  --shadow-float:0 14px 36px -14px rgba(30,28,25,.18);
  --shadow-button:0 10px 22px -10px rgba(217,90,31,.55);
  --shadow-card:0 12px 30px -22px rgba(30,28,25,.22);
  --max-width:1180px;
  --reading-width:780px;
  --gutter:clamp(16px,4vw,40px);
  --header-height:64px;
  --section-space:clamp(64px,9vw,112px);
  --toc-offset:80px;
  --motion-fast:150ms;
  --motion-normal:280ms;
}
*,*::before,*::after{box-sizing:border-box}
html{margin:0;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 16px)}
body{margin:0;min-width:320px;background:var(--color-page);color:var(--color-ink);font-family:var(--font-body);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-wrap:break-word}
html.nav-open{overflow:hidden}
img,svg,video{display:block;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{border:0;background:none;cursor:pointer}
ul,ol{margin-top:0}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:18px;border:1px solid var(--color-line);border-radius:var(--radius-md);background:var(--color-panel);font-size:.875rem;line-height:1.65;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[role="tab"]):focus-visible{outline:2px solid var(--color-focus);outline-offset:3px;border-radius:var(--radius-xs)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--max-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-tight{padding-top:clamp(42px,6vw,72px);padding-bottom:clamp(42px,6vw,72px)}
.section-heading{max-width:760px;margin:0 auto 42px;text-align:center}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;max-width:100%;min-height:28px;padding:4px 13px;border:1px solid var(--color-line);border-radius:var(--radius-pill);background:var(--color-page);color:var(--color-muted);font-size:.78rem;font-weight:650;line-height:1.35}
.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:var(--color-brand);flex-shrink:0}
.badge-brand{border-color:var(--color-brand);color:var(--color-brand-deep);background:var(--color-brand-soft)}
.badge-route{border-color:var(--color-route);color:var(--color-ink);background:var(--color-route-soft)}
.badge-success{border-color:var(--color-success);color:var(--color-success);background:var(--color-success-soft)}
h1,h2,h3,h4{margin-top:0;font-family:var(--font-display);line-height:1.16;letter-spacing:-.015em;text-wrap:balance}
h1,.hero-title{font-size:clamp(52px,5vw,72px);font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(32px,4vw,48px);font-weight:800}
h3{font-size:clamp(21px,2.2vw,28px);font-weight:750}
h4{font-size:1.05rem;font-weight:750}
p{margin-top:0}
.lead{font-size:clamp(18px,2vw,21px);line-height:1.75;color:var(--color-muted)}
.muted{color:var(--color-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.gradient-text{background:linear-gradient(128deg,var(--color-brand),var(--color-brand-deep));background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.actions{display:flex;align-items:center;flex-wrap:wrap;gap:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:11px 28px;border:1px solid transparent;border-radius:var(--radius-pill);font-weight:700;line-height:1.2;transition:transform var(--motion-fast),border-color var(--motion-fast),color var(--motion-fast),box-shadow var(--motion-fast),background-color var(--motion-fast)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{color:var(--color-white);background:linear-gradient(135deg,var(--color-brand),var(--color-brand-deep));box-shadow:var(--shadow-button)}
.btn-primary:hover{box-shadow:0 14px 28px -10px var(--color-brand-shadow)}
.btn-secondary{border-color:var(--color-line);background:var(--color-page);color:var(--color-ink)}
.btn-secondary:hover{border-color:var(--color-brand);color:var(--color-brand-deep)}
.btn-small{min-height:40px;padding:8px 18px;font-size:.88rem}
.btn[aria-disabled="true"],.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.card,.panel{min-width:0;border:1px solid var(--color-line);border-radius:var(--radius-md);background:var(--color-page);box-shadow:var(--shadow-card)}
.panel{background:var(--color-panel)}
.card-pad{padding:clamp(20px,3vw,32px)}
.grid-2,.grid-3{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}

/* Shared header */
.site-header{position:relative;z-index:80;border-bottom:1px solid transparent;background:var(--color-page)}
.header-inner{max-width:1360px;height:var(--header-height);margin-inline:auto;padding-inline:var(--gutter);display:flex;align-items:center;gap:10px}
.site-brand{display:flex;align-items:center;gap:10px;min-height:44px;margin-right:16px;white-space:nowrap}
.site-brand img{width:34px;height:34px}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.01em}
.brand-local{font-size:14px;font-weight:500;color:var(--color-muted)}
.desktop-nav{display:flex;align-items:center;gap:2px}
.nav-link,.nav-more-button{display:flex;align-items:center;justify-content:center;min-height:40px;padding:8px 13px;border-radius:var(--radius-pill);color:var(--color-muted);font-size:14px;font-weight:550}
.nav-link:hover,.nav-more-button:hover{background:var(--color-panel);color:var(--color-ink)}
.nav-link.is-active,.nav-more-button.is-active{color:var(--color-ink);font-weight:700}
.nav-more{position:relative}
.more-menu,.language-menu{position:absolute;top:calc(100% + 8px);min-width:188px;padding:8px;border:1px solid var(--color-line);border-radius:var(--radius-md);background:var(--color-page);box-shadow:var(--shadow-float);opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity var(--motion-fast),transform var(--motion-fast),visibility var(--motion-fast)}
.more-menu{left:0}
.language-menu{right:0}
.nav-more:hover .more-menu,.nav-more:focus-within .more-menu,.language-picker.is-open .language-menu{opacity:1;visibility:visible;transform:none}
.more-menu a,.language-menu a{display:flex;align-items:center;width:100%;min-height:42px;padding:8px 12px;border-radius:var(--radius-sm);font-size:14px}
.more-menu a:hover,.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--color-panel)}
.header-tools{margin-left:auto;display:flex;align-items:center;gap:10px}
.language-picker{position:relative}
.language-button{display:flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:6px 9px;color:var(--color-muted);font-size:13px}
.login-button{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:7px 21px;border:1px solid var(--color-line);border-radius:var(--radius-pill);font-size:14px;font-weight:700}
.login-button:hover{border-color:var(--color-brand);color:var(--color-brand-deep)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px}
.menu-toggle-lines,.menu-toggle-lines::before,.menu-toggle-lines::after{display:block;width:20px;height:2px;border-radius:var(--radius-pill);background:var(--color-ink);transition:transform var(--motion-fast),opacity var(--motion-fast)}
.menu-toggle-lines{position:relative}
.menu-toggle-lines::before,.menu-toggle-lines::after{content:"";position:absolute;left:0}
.menu-toggle-lines::before{top:-6px}
.menu-toggle-lines::after{top:6px}
.menu-toggle[aria-expanded="true"] .menu-toggle-lines{background:transparent}
.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before{top:0;transform:rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after{top:0;transform:rotate(-45deg)}
.mobile-nav{display:none;position:absolute;top:var(--header-height);left:var(--gutter);right:var(--gutter);z-index:82;max-height:calc(100dvh - var(--header-height) - 12px);overflow-y:auto;overscroll-behavior:contain;padding:10px;border:1px solid var(--color-line);border-radius:var(--radius-md);background:var(--color-page);box-shadow:var(--shadow-float)}
.mobile-nav.is-open{display:block}
.mobile-nav ul{list-style:none;margin:0;padding:0}
.mobile-nav a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 12px;border-radius:var(--radius-sm);color:var(--color-ink)}
.mobile-nav a:hover,.mobile-nav a.is-active{background:var(--color-panel)}
.mobile-language-label{padding:14px 12px 4px;color:var(--color-muted);font-size:12px;font-weight:700}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:70;background:var(--color-overlay)}
.nav-veil.is-open{display:block}

/* Shared footer */
.site-footer{margin-top:var(--section-space);border-top:1px solid var(--color-line);background:var(--color-panel)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px;padding-top:64px;padding-bottom:44px}
.footer-brand{max-width:360px}
.footer-brandline{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-family:var(--font-display);font-weight:800;font-size:20px}
.footer-brandline img{width:36px;height:36px}
.footer-title{margin-bottom:14px;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--color-muted)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 14px}
.footer-links a,.footer-language a{display:inline-flex;align-items:center;min-height:32px;color:var(--color-muted);font-size:14px}
.footer-links a:hover,.footer-language a:hover{color:var(--color-brand-deep)}
.footer-keywords{display:flex;flex-wrap:wrap;gap:8px}
.footer-keywords a{display:inline-flex;align-items:center;min-height:30px;padding:3px 10px;border:1px solid var(--color-line);border-radius:var(--radius-pill);background:var(--color-page);font-size:12px;color:var(--color-muted)}
.footer-language{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:20px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:20px;padding-bottom:24px;border-top:1px solid var(--color-line);font-size:13px;color:var(--color-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}

/* Prose */
.prose{max-width:var(--reading-width);margin-inline:auto}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.8em}
.prose a:not(.btn){color:var(--color-brand-deep);text-decoration:underline;text-underline-offset:3px}
.prose blockquote{margin:24px 0}
.prose img{border-radius:var(--radius-md)}
.prose ol.steps{list-style:none;padding-left:0;counter-reset:steps}
.prose ol.steps>li{position:relative;padding-left:48px;margin-bottom:26px;counter-increment:steps}
.prose ol.steps>li::before{content:counter(steps);position:absolute;left:0;top:0;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--color-brand-soft);color:var(--color-brand-deep);font-family:var(--font-mono);font-weight:700}

/* Generic hero */
.hero{position:relative;overflow-x:clip;text-align:center;padding:42px var(--gutter) 0}
.hero::before{content:"";position:absolute;inset:-12%;pointer-events:none;background:radial-gradient(1150px 640px at 84% -4%,var(--color-brand-soft),transparent 62%),radial-gradient(760px 460px at 100% 34%,rgba(232,161,60,.08),transparent 70%);animation:ambient-drift 16s ease-in-out infinite alternate}
.hero-inner{position:relative;z-index:1;width:100%;max-width:1160px;margin-inline:auto}
.hero-title{margin:22px 0 14px}
.hero-copy{max-width:780px;margin-inline:auto;color:var(--color-muted)}
.hero-actions{justify-content:center;margin:26px 0 16px}
.trust-row{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 20px;margin:0;color:var(--color-muted);font-size:13px}
.trust-row span{white-space:nowrap}
.fact-row{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:22px}
.fact-pill{display:inline-flex;align-items:center;min-height:34px;padding:5px 13px;border:1px solid var(--color-line);border-radius:var(--radius-pill);background:var(--color-page);font-size:12px;color:var(--color-muted)}
@keyframes ambient-drift{to{transform:translate3d(-1.6%,1.4%,0) scale(1.045)}}

@media (max-width:1080px){
  .desktop-nav{display:none}
  .menu-toggle{display:flex}
  .header-tools{margin-left:auto}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:768px){
  h1,.hero-title{font-size:clamp(28px,9vw,40px);line-height:1.14}
  h2{font-size:clamp(28px,8vw,38px)}
  .hero{padding-top:30px}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:34px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .brand-local,.language-picker{display:none}
  .header-tools{margin-left:auto;gap:4px}
  .login-button{padding-inline:15px}
  .hero-actions{margin-top:22px}
}
@media (max-width:640px){
  :root{--gutter:16px}
  .wrap,.reading{padding-inline:var(--gutter)}
  .actions{align-items:stretch}
  .actions .btn{flex:1 1 auto}
  .hero-actions .btn{min-width:min(100%,150px)}
  .card-pad{padding:20px}
  .tilt-card,[data-tilt]{transform:none!important}
  .footer-links{grid-template-columns:1fr 1fr}
}
@media (max-width:390px){
  .site-brand{margin-right:0}
  .brand-en{font-size:17px}
  .login-button{padding-inline:12px;font-size:13px}
  .footer-links{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1!important;transform:none!important}
}
::selection{background:var(--color-brand-soft);color:var(--color-ink)}