:root{--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-7: 32px;--space-8: 40px;--space-9: 48px;--space-10: 64px;--space-11: 80px;--space-12: 96px;--fs-xs: .75rem;--fs-sm: .8125rem;--fs-body: .875rem;--fs-base: 1rem;--fs-md: 1.0625rem;--fs-lg: 1.25rem;--fs-xl: 1.5rem;--fs-2xl: 2rem;--bg: #070b14;--bg-glow-1: rgba(79, 140, 255, .1);--bg-glow-2: rgba(29, 78, 216, .08);--surface: #0c1220;--surface-2: #111a2b;--surface-3: #16223a;--border: rgba(146, 170, 214, .11);--border-strong: rgba(146, 170, 214, .2);--text: #edf1fa;--text-muted: #a5b2c9;--text-dim: #78849c;--accent: #4f8cff;--accent-strong: #79a6ff;--accent-quiet: rgba(79, 140, 255, .12);--accent-border: rgba(79, 140, 255, .32);--on-accent: #061020;--ok: #34d399;--ok-quiet: rgba(52, 211, 153, .14);--warn: #fbbf24;--warn-quiet: rgba(251, 191, 36, .14);--info: #7dd3fc;--info-quiet: rgba(125, 211, 252, .14);--code-bg: #05080f;--code-border: rgba(146, 170, 214, .12);--code-text: #d5deef;--code-comment: #6f7fa0;--shadow-sm: 0 1px 2px rgba(3, 7, 16, .45), 0 10px 24px -18px rgba(3, 7, 16, .9);--shadow-md: 0 1px 2px rgba(3, 7, 16, .5), 0 20px 44px -28px rgba(3, 7, 16, .95);--shadow-lg: 0 2px 4px rgba(3, 7, 16, .55), 0 48px 96px -52px rgba(3, 7, 16, 1);--card-shadow: inset 0 1px 0 rgba(255, 255, 255, .035), 0 1px 2px rgba(3, 7, 16, .35), 0 24px 48px -40px rgba(3, 7, 16, .9);--input-shadow: inset 0 1px 2px rgba(3, 7, 16, .45);--radius-xs: 8px;--radius-sm: 10px;--radius: 14px;--radius-lg: 20px;--radius-pill: 999px;--container: 1160px;--nav-height: 68px;--nav-bg: rgba(7, 11, 20, .78);--sans: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;color-scheme:dark}:root[data-theme=light]{--bg: #fbfcfe;--bg-glow-1: rgba(79, 140, 255, .09);--bg-glow-2: rgba(29, 78, 216, .06);--surface: #ffffff;--surface-2: #f5f7fc;--surface-3: #edf1f9;--border: rgba(16, 26, 43, .08);--border-strong: rgba(16, 26, 43, .16);--text: #0d1524;--text-muted: #4f5b70;--text-dim: #646f85;--accent: #2f6ff0;--accent-strong: #1f57cc;--accent-quiet: rgba(47, 111, 240, .08);--accent-border: rgba(47, 111, 240, .28);--on-accent: #ffffff;--ok: #0b8a5d;--ok-quiet: rgba(15, 157, 107, .1);--warn: #96620f;--warn-quiet: rgba(183, 121, 31, .12);--info: #0a6c9c;--info-quiet: rgba(12, 123, 179, .1);--code-bg: #0d1526;--code-border: #1d2a44;--code-text: #e2e9f7;--code-comment: #8095b8;--nav-bg: rgba(251, 252, 254, .8);--shadow-sm: 0 1px 2px rgba(16, 26, 43, .05), 0 10px 24px -18px rgba(16, 26, 43, .3);--shadow-md: 0 1px 2px rgba(16, 26, 43, .06), 0 20px 44px -28px rgba(16, 26, 43, .35);--shadow-lg: 0 2px 4px rgba(16, 26, 43, .06), 0 48px 96px -48px rgba(16, 26, 43, .4);--card-shadow: 0 1px 2px rgba(16, 26, 43, .04), 0 16px 32px -28px rgba(16, 26, 43, .28);--input-shadow: inset 0 1px 2px rgba(16, 26, 43, .06);color-scheme:light}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{margin:0;min-height:100%;background-color:var(--bg);background-image:radial-gradient(1100px 560px at 10% -12%,var(--bg-glow-1),transparent 60%),radial-gradient(820px 460px at 94% 0%,var(--bg-glow-2),transparent 58%);background-repeat:no-repeat;color:var(--text);font-family:var(--sans);font-size:var(--fs-base);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3,h4{margin:0;line-height:1.2;letter-spacing:-.02em;font-weight:600}h1{font-size:clamp(2.25rem,1.6rem + 2.8vw,3.5rem);line-height:1.06;letter-spacing:-.03em}h2{font-size:clamp(1.6rem,1.35rem + 1vw,2.125rem);line-height:1.15;letter-spacing:-.025em}h3{font-size:var(--fs-md);line-height:1.35}h4{font-size:var(--fs-base);line-height:1.4}p{margin:0}ul,ol{margin:0;padding:0;list-style:none}a{color:var(--accent);text-decoration:none;text-underline-offset:2px}a:hover{text-decoration:underline}img,svg{max-width:100%}button{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--accent-strong);outline-offset:2px;border-radius:6px}.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:28px}.section{padding-block:clamp(72px,7.5vw,116px);border-top:1px solid var(--border);scroll-margin-top:calc(var(--nav-height) + 12px)}.section--plain{border-top-color:transparent}.section__head{max-width:640px;margin-bottom:var(--space-8)}.section__title{margin-bottom:var(--space-3)}.section__subtitle{color:var(--text-muted);font-size:var(--fs-md);line-height:1.7}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--card-shadow)}.card--pad{padding:var(--space-6)}.btn{--btn-bg: var(--surface-2);--btn-fg: var(--text);--btn-border: var(--border-strong);display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border:1px solid var(--btn-border);border-radius:var(--radius-sm);background:var(--btn-bg);color:var(--btn-fg);font-size:.9375rem;font-weight:600;line-height:1.3;cursor:pointer;transition:transform .14s ease,box-shadow .14s ease,background-color .14s ease,border-color .14s ease,color .14s ease}.btn:hover{text-decoration:none;transform:translateY(-1px)}.btn--primary{--btn-bg: var(--accent);--btn-fg: var(--on-accent);--btn-border: transparent;box-shadow:0 1px 2px #0510203d,0 14px 30px -20px #2f6ff0e6}.btn--primary:hover{--btn-bg: var(--accent-strong);box-shadow:0 1px 2px #0510203d,0 18px 36px -20px #2f6ff0f2}.btn--secondary{--btn-bg: transparent;--btn-fg: var(--text)}.btn--secondary:hover{--btn-bg: var(--surface-2);--btn-border: var(--border-strong)}.btn[aria-disabled=true],.btn:disabled{--btn-bg: var(--surface-2);--btn-fg: var(--text-dim);--btn-border: var(--border);cursor:not-allowed;box-shadow:none;transform:none}.btn[aria-disabled=true]:hover,.btn:disabled:hover{--btn-bg: var(--surface-2);transform:none}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;border:1px solid var(--border);border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);cursor:pointer;transition:background-color .14s ease,border-color .14s ease,color .14s ease}.icon-btn:hover{background:var(--surface-2);border-color:var(--border-strong);color:var(--text)}.badge{display:inline-flex;align-items:center;gap:6px;padding:2px 9px;border:1px solid var(--border);border-radius:var(--radius-pill);background:var(--surface-2);color:var(--text-muted);font-size:var(--fs-xs);font-weight:600;letter-spacing:.01em;white-space:nowrap}.badge--ok{border-color:transparent;background:var(--ok-quiet);color:var(--ok)}.badge--warn{border-color:transparent;background:var(--warn-quiet);color:var(--warn)}.badge--info{border-color:transparent;background:var(--info-quiet);color:var(--info)}.badge--muted{color:var(--text-dim)}.mono{font-family:var(--mono);font-size:.86rem}.code-block{margin:0;padding:16px 18px;border:1px solid var(--code-border);border-radius:var(--radius-sm);background:var(--code-bg);color:var(--code-text);font-family:var(--mono);font-size:.8rem;line-height:1.7;overflow-x:auto;-moz-tab-size:4;tab-size:4}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-60px;left:16px;z-index:60;padding:10px 16px;border-radius:var(--radius-sm);background:var(--surface-3);border:1px solid var(--accent-border);color:var(--text);font-weight:600;transition:top .12s ease}.skip-link:focus{top:12px;text-decoration:none}@media (max-width: 640px){.container{padding-inline:20px}}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}.btn:hover{transform:none}}.logo{display:inline-flex;align-items:center;gap:10px;color:var(--text)}.logo__mark{flex:none;display:block;filter:drop-shadow(0 6px 14px rgba(47,111,240,.28))}.logo__text{display:flex;flex-direction:column;line-height:1.1}.logo__wordmark{font-size:var(--fs-base);font-weight:650;letter-spacing:.12em}.logo__code{color:var(--text-dim);font-size:.6rem;letter-spacing:.1em;text-transform:uppercase}@media (max-width: 420px){.logo__code{display:none}}.nav{position:sticky;top:0;z-index:40;background:var(--nav-bg);border-bottom:1px solid var(--border);backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%)}.nav__inner{display:flex;align-items:center;gap:var(--space-6);min-height:var(--nav-height)}.nav__brand{color:inherit;flex:none}.nav__brand:hover{text-decoration:none}.nav__menu{flex:1 1 auto;min-width:0}.nav__links{display:flex;align-items:center;gap:2px;flex-wrap:wrap}.nav__links a{display:inline-block;padding:6px 10px;border-radius:var(--radius-xs);color:var(--text-muted);font-size:var(--fs-body);font-weight:500;transition:color .14s ease,background-color .14s ease}.nav__links a:hover{color:var(--text);background:var(--surface-2);text-decoration:none}.nav__links a[aria-current=page]{color:var(--text);background:var(--surface-2)}.nav__actions{display:flex;align-items:center;gap:var(--space-2);flex:none;margin-left:auto}.nav__account{display:inline-flex;align-items:center;gap:8px;max-width:180px;padding:4px 12px 4px 4px;border:1px solid var(--border);border-radius:var(--radius-pill);background:transparent;color:var(--text-muted);font-size:var(--fs-sm);font-weight:600;transition:color .14s ease,background-color .14s ease,border-color .14s ease}.nav__account--plain{padding:6px 12px}.nav__account:hover{border-color:var(--border-strong);background:var(--surface-2);color:var(--text);text-decoration:none}.nav__avatar{display:grid;place-items:center;flex:none;width:22px;height:22px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-size:.7rem;font-weight:700}.nav__account-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nav__seg{display:inline-flex;padding:3px;border:1px solid var(--border);border-radius:var(--radius-pill);background:var(--surface-2)}.nav__seg-btn{padding:4px 11px;border:0;border-radius:var(--radius-pill);background:transparent;color:var(--text-muted);font-size:var(--fs-xs);font-weight:600;cursor:pointer;transition:background-color .14s ease,color .14s ease}.nav__seg-btn:hover{color:var(--text)}.nav__seg-btn.is-active{background:var(--accent);color:var(--on-accent)}.nav__burger{display:none}@media (max-width: 980px){.nav__burger{display:inline-flex}.nav__menu{position:absolute;top:100%;left:0;right:0;display:none;padding:var(--space-3) 20px var(--space-5);background:var(--surface);border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg)}.nav__menu.is-open{display:block}.nav__links{flex-direction:column;align-items:stretch;gap:2px}.nav__links a{padding:11px 12px;font-size:.95rem}}@media (max-width: 560px){.nav__inner{gap:10px}.nav__seg-btn{padding:4px 9px}.nav__account{max-width:112px;padding-right:10px}.nav__account--plain{padding:6px 10px}}@media (max-width: 400px){.nav__inner{gap:8px}.logo__wordmark{font-size:.95rem;letter-spacing:.1em}.nav__actions{gap:6px}.nav__seg-btn{padding:4px 7px;font-size:.75rem}.nav__actions .icon-btn{width:34px;height:34px}}.footer{margin-top:var(--space-6);border-top:1px solid var(--border);background:var(--surface)}.footer__inner{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:var(--space-8);padding-block:var(--space-10) var(--space-7)}.footer__brand{display:flex;flex-direction:column;gap:var(--space-3)}.footer__blurb{max-width:38ch;color:var(--text-muted);font-size:var(--fs-body);line-height:1.65}.footer__heading{margin:0 0 var(--space-3);color:var(--text-dim);font-size:.6875rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.footer__links ul{display:flex;flex-direction:column;gap:8px}.footer__links a{color:var(--text-muted);font-size:var(--fs-body)}.footer__links a:hover{color:var(--text)}.footer__notice-text{color:var(--text-muted);font-size:var(--fs-body)}.footer__records{display:flex;flex-direction:column;gap:6px}.footer__records a{display:inline-flex;align-items:center;gap:6px;color:var(--text-muted);font-size:var(--fs-body);line-height:1.5}.footer__records a:hover{color:var(--text)}.footer__records img{flex:none;border-radius:2px}.footer__bottom{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3) var(--space-5);flex-wrap:wrap;padding-block:var(--space-4) var(--space-6);border-top:1px solid var(--border)}.footer__legal{color:var(--text-dim);font-size:var(--fs-xs);line-height:1.6}.footer__top{color:var(--text-muted);font-size:var(--fs-sm);font-weight:500}.footer__top:hover{color:var(--text)}@media (max-width: 640px){.footer__inner{grid-template-columns:minmax(0,1fr);gap:var(--space-6)}}