:root{--bg: #080d1a;--bg-glow-1: rgba(79, 140, 255, .22);--bg-glow-2: rgba(29, 78, 216, .18);--surface: #0f1729;--surface-2: #141e34;--surface-3: #1a2540;--border: #22304d;--border-strong: #31415f;--text: #e9edf7;--text-muted: #9aa7c2;--text-dim: #74829e;--accent: #4f8cff;--accent-strong: #6ea3ff;--accent-quiet: rgba(79, 140, 255, .14);--accent-border: rgba(79, 140, 255, .4);--on-accent: #05101f;--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: #060a14;--code-border: #1c2740;--code-text: #d5deef;--code-comment: #6f7fa0;--shadow-lg: 0 24px 60px rgba(2, 6, 18, .55);--shadow-sm: 0 6px 18px rgba(2, 6, 18, .35);--radius: 16px;--radius-sm: 10px;--radius-pill: 999px;--container: 1120px;--nav-height: 64px;--nav-bg: rgba(8, 13, 26, .82);--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: #f6f8fd;--bg-glow-1: rgba(79, 140, 255, .16);--bg-glow-2: rgba(29, 78, 216, .1);--surface: #ffffff;--surface-2: #f2f5fc;--surface-3: #e8eefa;--border: #dbe3f1;--border-strong: #c3cee2;--text: #101a2b;--text-muted: #55627c;--text-dim: #7b879e;--accent: #2f6ff0;--accent-strong: #1f57cc;--accent-quiet: rgba(47, 111, 240, .1);--accent-border: rgba(47, 111, 240, .32);--on-accent: #ffffff;--ok: #0f9d6b;--ok-quiet: rgba(15, 157, 107, .12);--warn: #b7791f;--warn-quiet: rgba(183, 121, 31, .14);--info: #0c7bb3;--info-quiet: rgba(12, 123, 179, .12);--code-bg: #0d1526;--code-border: #1d2a44;--code-text: #e2e9f7;--code-comment: #8095b8;--nav-bg: rgba(246, 248, 253, .85);--shadow-lg: 0 24px 60px rgba(24, 39, 75, .14);--shadow-sm: 0 6px 18px rgba(24, 39, 75, .09);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(1200px 620px at 12% -10%,var(--bg-glow-1),transparent 62%),radial-gradient(900px 520px at 92% 4%,var(--bg-glow-2),transparent 60%);background-repeat:no-repeat;color:var(--text);font-family:var(--sans);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3,h4{margin:0;line-height:1.2;letter-spacing:-.015em;font-weight:650}h1{font-size:clamp(2rem,1.35rem + 2.6vw,3.25rem)}h2{font-size:clamp(1.5rem,1.2rem + 1.2vw,2.1rem)}h3{font-size:1.075rem}p{margin:0}ul,ol{margin:0;padding:0;list-style:none}a{color:var(--accent);text-decoration:none}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:24px}.section{padding-block:clamp(48px,6vw,84px);border-top:1px solid var(--border);scroll-margin-top:calc(var(--nav-height) + 12px)}.section--plain{border-top-color:transparent}.section__head{max-width:720px;margin-bottom:32px}.section__title{margin-bottom:10px}.section__subtitle{color:var(--text-muted);font-size:1rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.card--pad{padding:22px}.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:11px 20px;border:1px solid var(--btn-border);border-radius:var(--radius-pill);background:var(--btn-bg);color:var(--btn-fg);font-size:.95rem;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: linear-gradient(135deg, var(--accent-strong), var(--accent));--btn-fg: var(--on-accent);--btn-border: transparent;box-shadow:0 10px 26px #2f6ff052}.btn--secondary{--btn-bg: transparent;--btn-fg: var(--text)}.btn--secondary:hover{--btn-bg: var(--accent-quiet);--btn-border: var(--accent-border)}.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:38px;height:38px;padding:0;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface-2);color:var(--text);cursor:pointer;transition:background-color .14s ease,border-color .14s ease}.icon-btn:hover{background:var(--surface-3);border-color:var(--accent-border)}.badge{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border:1px solid var(--border-strong);border-radius:var(--radius-pill);background:var(--surface-2);color:var(--text-muted);font-size:.75rem;font-weight:600;letter-spacing:.02em;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:18px}}@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:1.06rem;font-weight:700;letter-spacing:.16em}.logo__code{color:var(--text-dim);font-size:.62rem;letter-spacing:.08em;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(14px);-webkit-backdrop-filter:blur(14px)}.nav__inner{display:flex;align-items:center;gap:18px;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:4px;flex-wrap:wrap}.nav__links a{display:inline-block;padding:7px 11px;border-radius:var(--radius-sm);color:var(--text-muted);font-size:.9rem;font-weight:550;transition:color .14s ease,background-color .14s ease}.nav__links a:hover{color:var(--text);background:var(--surface-2);text-decoration:none}.nav__actions{display:flex;align-items:center;gap:8px;flex:none;margin-left:auto}.nav__seg{display:inline-flex;padding:3px;border:1px solid var(--border-strong);border-radius:var(--radius-pill);background:var(--surface-2)}.nav__seg-btn{padding:4px 12px;border:0;border-radius:var(--radius-pill);background:transparent;color:var(--text-muted);font-size:.8rem;font-weight:650;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:12px 18px 18px;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}}@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:24px;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:28px;padding-block:36px 26px}.footer__brand{display:flex;flex-direction:column;gap:12px}.footer__blurb{max-width:42ch;color:var(--text-muted);font-size:.88rem}.footer__heading{margin:0 0 10px;color:var(--text-dim);font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.footer__links ul{display:flex;flex-direction:column;gap:8px}.footer__links a{font-size:.9rem}.footer__notice-text{color:var(--text-muted);font-size:.86rem}.footer__bottom{display:flex;align-items:center;justify-content:space-between;gap:12px 20px;flex-wrap:wrap;padding-block:16px 26px;border-top:1px solid var(--border)}.footer__legal{color:var(--text-dim);font-size:.78rem}.footer__top{font-size:.8rem;font-weight:600}@media (max-width: 640px){.footer__inner{grid-template-columns:minmax(0,1fr);gap:24px}}