:root{--bg:#f3f5f9;--card:#fff;--ink:#111a33;--mut:#586178;--acc:#2748d8;--line:rgba(17,26,51,.12);--role:rgba(124,92,255,.17);--ctx:rgba(28,170,110,.2);--task:rgba(240,170,20,.26);--fmt:rgba(235,70,100,.17);--w:1120px}
@media(prefers-color-scheme:dark){:root{--bg:#0d1323;--card:#151d33;--ink:#e8ecf7;--mut:#9aa5bf;--acc:#8ea6ff;--line:rgba(232,236,247,.13);--role:rgba(150,120,255,.28);--ctx:rgba(40,190,125,.26);--task:rgba(245,180,40,.28);--fmt:rgba(245,90,120,.26)}}
*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;min-width:320px;background:var(--bg);color:var(--ink);font:16px/1.65 "Segoe UI",Roboto,"Helvetica Neue",Arial,system-ui,sans-serif}
a{color:var(--acc);text-underline-offset:3px}a:focus-visible,summary:focus-visible{outline:3px solid var(--acc);outline-offset:3px;border-radius:4px}
h1,h2,h3{margin:0;font-weight:750;letter-spacing:-.03em;line-height:1.08}
h1{font-size:clamp(2.2rem,5.4vw,4rem)}h2{font-size:clamp(1.6rem,3vw,2.2rem)}h3{font-size:1.15rem;letter-spacing:-.01em}
p{margin:0 0 1rem}.w{width:min(var(--w),calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.hi{min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:inline-flex;align-items:center;gap:9px;font-weight:800;font-size:1.1rem;letter-spacing:-.03em;text-decoration:none;color:var(--ink)}
.logo svg{width:26px;height:26px}.logo b{color:var(--acc)}
.nav{display:flex;gap:4px}.nav a{padding:8px 13px;border-radius:999px;text-decoration:none;color:var(--mut);font-weight:500}
.nav a:hover{color:var(--ink)}.nav a[aria-current]{background:var(--ink);color:var(--bg)}
.nt{position:absolute;opacity:0;pointer-events:none}.mb{display:none;cursor:pointer;padding:10px;margin-right:-10px}
.mb i,.mb i::before,.mb i::after{display:block;width:20px;height:2px;background:var(--ink);position:relative;content:""}
.mb i::before{position:absolute;top:-6px}.mb i::after{position:absolute;top:6px}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding:72px 0 64px}
.lead{font-size:1.15rem;color:var(--mut);max-width:34em;margin:22px 0 28px}
.btn{display:inline-block;padding:13px 22px;border-radius:12px;background:var(--acc);color:#fff;font-weight:650;text-decoration:none;margin-right:10px}
.btn.alt{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line)}
.demo{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}
.demo h3{font-size:.95rem;color:var(--mut);font-weight:600;margin-bottom:12px}
pre.prompt{margin:0;white-space:pre-wrap;font:.92rem/1.9 ui-monospace,"Cascadia Code",Menlo,Consolas,monospace}
.t-role,.t-ctx,.t-task,.t-fmt{padding:2px 4px;border-radius:5px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.t-role{background:var(--role)}.t-ctx{background:var(--ctx)}.t-task{background:var(--task)}.t-fmt{background:var(--fmt)}
.legend{display:grid;grid-template-columns:1fr 1fr;gap:8px 16px;margin:18px 0 0;padding:16px 0 0;border-top:1px solid var(--line);font-size:.88rem;color:var(--mut)}
.legend span{display:flex;gap:8px;align-items:center}.legend i{width:12px;height:12px;border-radius:4px}
.sec{padding:56px 0;border-top:1px solid var(--line)}.sh{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:32px}.sh p{max-width:30em;color:var(--mut);margin:0}
.steps{list-style:none;counter-reset:s;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.steps li{counter-increment:s;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px}
.steps li::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--bg);font-weight:700;margin-bottom:16px}
.steps p{color:var(--mut);margin:8px 0 12px}
.rows a.row{display:grid;grid-template-columns:1fr auto;gap:8px 24px;padding:22px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.rows a.row:first-child{border-top:1px solid var(--line)}.rows a.row:hover h3{color:var(--acc)}
.rows h3{font-size:1.3rem}.rows p{grid-column:1;margin:4px 0 0;color:var(--mut);max-width:44em}.rows small{color:var(--mut);align-self:start;padding-top:4px;white-space:nowrap}
.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}.box{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px}.box p{color:var(--mut);margin:8px 0 0}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{cursor:pointer;font-weight:650;font-size:1.05rem}.faq p{margin:12px 0 0;color:var(--mut);max-width:46em}
.doc{display:grid;grid-template-columns:230px minmax(0,1fr);gap:64px;padding:56px 0 72px}
.toc{position:sticky;top:88px;align-self:start;font-size:.92rem}.toc b{display:block;margin-bottom:10px}.toc a{display:block;padding:6px 0 6px 14px;border-left:2px solid var(--line);color:var(--mut);text-decoration:none}.toc a:hover{color:var(--acc);border-color:var(--acc)}
.art{max-width:44rem}.art header{margin-bottom:36px}.art header p{color:var(--mut);margin:16px 0 0}
.body{font:1.12rem/1.8 Charter,"Iowan Old Style",Georgia,"Times New Roman",serif}.body h2{font-family:"Segoe UI",Roboto,Arial,sans-serif;margin:2.4em 0 .7em;scroll-margin-top:90px}
.body ul,.body ol{padding-left:1.3em;margin:0 0 1.2rem}.body li{margin-bottom:.5rem}
.note{border-left:4px solid var(--acc);background:var(--card);padding:16px 20px;border-radius:0 12px 12px 0;margin:1.6rem 0;font-family:"Segoe UI",Roboto,Arial,sans-serif;font-size:1rem;line-height:1.6}
.body pre.prompt{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:1.2rem 0}
dl.gl{margin:0}dl.gl dt{font-weight:750;font-size:1.15rem;margin-top:28px;scroll-margin-top:90px}dl.gl dd{margin:6px 0 0;color:var(--mut);max-width:42em}
.nf{text-align:center;padding:110px 0}.nf h1{font-size:clamp(5rem,16vw,10rem);color:var(--acc)}.nf p{color:var(--mut);margin:16px 0 28px}
.site-footer{border-top:1px solid var(--line);padding:44px 0 32px;color:var(--mut);font-size:.93rem}
.fg{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:32px}.fg b{display:block;color:var(--ink);margin-bottom:10px}.fg a{display:block;color:var(--mut);text-decoration:none;padding:2px 0}.fg a:hover{color:var(--acc)}
.fb{margin-top:32px;padding-top:18px;border-top:1px solid var(--line)}
@media(max-width:860px){.hero,.two,.doc{grid-template-columns:1fr;gap:28px}.hero{padding:44px 0}.steps{grid-template-columns:1fr}.toc{display:none}.fg{grid-template-columns:1fr}.sh{flex-direction:column;align-items:start;gap:12px}
.mb{display:block}.nav{display:none;position:absolute;left:0;right:0;top:64px;flex-direction:column;padding:12px 20px 20px;background:var(--bg);border-bottom:1px solid var(--line)}.nt:checked~.nav{display:flex}.rows a.row{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}