:root{--ink:#0b0e0d;--ink-2:#131816;--paper:#f4f6f5;--white:#fff;--line-dark:#26302c;--line:#d9dedb;--muted-dark:#9aa7a1;--muted:#566160;--blue:#2447f0;--blue-text:#1b3ad6;--blue-on-dark:#8ea5ff;--font-sans:"PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;--font-mono:ui-monospace, "SF Mono", "Cascadia Mono", Consolas, "Courier New", monospace;--pad:clamp(1.25rem, 4vw, 2.5rem)}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:4.5rem}body{color:var(--ink);background:var(--paper);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;margin:0;font-size:1rem;line-height:1.7}h1,h2,h3,p,dl,dd,ul,figure{margin:0}a{color:inherit}code{font-family:var(--font-mono);background:#7f8c862e;border-radius:3px;padding:.1em .35em;font-size:.88em}.skip-link{z-index:100;color:var(--ink);background:var(--white);padding:.6rem 1rem;position:absolute;top:0;left:-999px}.skip-link:focus{top:.5rem;left:.5rem}:focus-visible{outline:2px solid var(--blue-on-dark);outline-offset:2px}.wrap{width:100%;max-width:72rem;padding:0 var(--pad);margin:0 auto}.narrow{max-width:48rem}.center{text-align:center}.dark{color:var(--paper);background:var(--ink)}.site-header{z-index:50;padding:.85rem var(--pad);color:var(--paper);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line-dark);background:#0b0e0deb;align-items:center;gap:2rem;display:flex;position:sticky;top:0}.brand{letter-spacing:-.01em;font-size:1.1rem;font-weight:800;text-decoration:none}.site-nav{gap:1.6rem;margin-left:auto;font-size:.92rem;display:flex}.site-nav a{color:var(--muted-dark);text-decoration:none}.site-nav a:hover{color:var(--paper)}.btn{min-height:3rem;font:inherit;cursor:pointer;border:1px solid #0000;border-radius:6px;justify-content:center;align-items:center;padding:0 1.4rem;font-weight:600;text-decoration:none;display:inline-flex}.btn-sm{min-height:2.4rem;padding:0 1rem;font-size:.9rem}.btn-primary{color:var(--white);background:var(--blue)}.btn-primary:hover{background:#1a3bd9}.btn-ghost{color:var(--paper);border-color:#3a4642}.btn-ghost:hover{border-color:var(--paper)}.btn-dark{color:var(--paper);background:var(--ink)}.btn-dark:hover{background:#26302c}.actions{flex-wrap:wrap;gap:.75rem;margin-top:2rem;display:flex}.center-actions{justify-content:center}.hero{padding:clamp(3rem,8vw,6rem) 0}.hero-grid{grid-template-columns:minmax(0,5fr) minmax(0,6fr);align-items:center;gap:clamp(2rem,5vw,4rem);display:grid}.kicker{color:var(--blue-on-dark);font-family:var(--font-mono);letter-spacing:.04em;margin-bottom:1rem;font-size:.82rem}h1{letter-spacing:-.02em;font-size:clamp(2.2rem,4.4vw,3.5rem);font-weight:800;line-height:1.15}h1 em{white-space:nowrap;color:var(--blue-on-dark);font-style:normal}.lede{max-width:34rem;color:var(--muted-dark);margin-top:1.4rem;font-size:1.08rem}.hero-points{color:var(--muted-dark);gap:.3rem;margin:1.8rem 0 0;padding:0;font-size:.92rem;list-style:none;display:grid}.hero-points li:before{content:"";background:var(--blue-on-dark);border-radius:50%;width:.5rem;height:.5rem;margin-right:.6rem;display:inline-block}.hero-copy,.duo{min-width:0}.duo{grid-template-columns:minmax(0,1fr);gap:.75rem;display:grid}.pane{border:1px solid var(--line-dark);background:var(--ink-2);border-radius:8px;min-width:0;padding:.9rem 1rem 1rem}.pane-read{background:#0f1630;border-color:#2f4bb8}.pane figcaption{color:var(--muted-dark);margin-bottom:.6rem;font-size:.8rem}.pane-read figcaption{color:var(--blue-on-dark)}.scroll{overflow-x:auto}table{border-collapse:collapse;white-space:nowrap;width:100%;font-size:.9rem}th,td{text-align:left;border-bottom:1px solid #ffffff14;padding:.4rem .7rem}th{color:var(--muted-dark);font-weight:600}.pane-read th{color:var(--paper)}.num{text-align:right}.mono{font-family:var(--font-mono)}tbody tr:last-child td{border-bottom:0}.tag{color:var(--blue-on-dark);border:1px solid #2f4bb8;border-radius:4px;padding:.05rem .5rem;font-size:.82rem;display:inline-block}[data-f].is-linked{background:#8ea5ff38}.duo-note{color:var(--muted-dark);font-size:.8rem}.section{padding:clamp(3.5rem,8vw,6rem) 0}.section-alt{background:var(--white)}h2{letter-spacing:-.015em;font-size:clamp(1.7rem,3.4vw,2.5rem);font-weight:800;line-height:1.25}.section-lede{max-width:40rem;color:var(--muted);margin-top:.9rem;font-size:1.05rem}.dark .section-lede{color:var(--muted-dark)}.center .section-lede{margin-left:auto;margin-right:auto}.cards3{grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2.5rem;display:grid}.card{background:var(--white);border:1px solid var(--line);border-radius:8px;padding:1.5rem}.card-hl{color:var(--paper);background:var(--ink);border-color:var(--ink)}.card h3{margin-bottom:1rem;font-size:1.15rem;font-weight:800}.card dt{color:var(--muted);margin-top:1rem;font-size:.8rem;font-weight:600}.card-hl dt{color:var(--blue-on-dark)}.card dd{margin-top:.15rem;font-size:.95rem}.feature{border-top:2px solid var(--ink);padding-top:1.25rem}.num-big{color:var(--blue-text);font-family:var(--font-mono);font-size:2.6rem;font-weight:700;line-height:1.1}.feature h3{margin:.6rem 0 .4rem;font-size:1.2rem;font-weight:800}.feature p:last-child{color:var(--muted)}.section-alt .center{margin-top:2.5rem}.flow{flex-wrap:wrap;align-items:center;gap:.6rem;margin:2rem 0;display:flex}.node{border:1px solid #3a4642;border-radius:6px;padding:.55rem 1rem}.node-hl{color:var(--white);background:var(--blue);border-color:var(--blue)}.node-off{color:var(--muted-dark);border-style:dashed;margin-left:auto;font-size:.88rem}.arrow{color:var(--muted-dark)}.checks{gap:.9rem;max-width:44rem;margin:0;padding:0;list-style:none;display:grid}.checks li{color:var(--muted-dark);border-left:2px solid var(--blue);padding-left:1.2rem}.checks strong{color:var(--paper)}.kicker-light{color:var(--blue-text)}.codes-grid{grid-template-columns:minmax(0,5fr) minmax(0,6fr);align-items:center;gap:clamp(2rem,5vw,4rem);display:grid}.codes-grid>div{min-width:0}.codes-points{gap:.9rem;margin:1.8rem 0 0;padding:0;list-style:none;display:grid}.codes-points li{color:var(--muted);border-left:2px solid var(--blue-text);padding-left:1.1rem}.codes-points strong{color:var(--ink)}.sheet{background:var(--white);border:1px solid var(--line);border-radius:8px;min-width:0;padding:1rem 1.1rem}.sheet th{color:var(--ink);border-bottom:1px solid var(--line)}.sheet td{border-bottom:1px solid #eceeed}.sheet tbody tr:last-child td{border-bottom:0}.th-name{font-weight:700;display:block}.th-code{color:var(--muted);font-family:var(--font-mono);font-size:.75rem;font-weight:400;display:block}.raw{font-family:var(--font-mono)}.tr{color:var(--blue-text)}.sheet figcaption{color:var(--muted);margin-top:.7rem;font-size:.8rem}.inline-link{color:var(--blue-on-dark)}.desktop-card{background:var(--ink-2);border:1px solid #2f4bb8;border-radius:8px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:2rem;margin-top:3.5rem;padding:clamp(1.5rem,3vw,2.25rem);display:grid}.desktop-card h3{margin:.3rem 0 .6rem;font-size:1.5rem;font-weight:800}.desktop-card>div>p:not(.kicker){max-width:38rem;color:var(--muted-dark)}.desktop-card .kicker{margin-bottom:0}.desktop-points{color:var(--muted-dark);gap:.3rem;margin:1rem 0 0;padding:0;font-size:.92rem;list-style:none;display:grid}.desktop-points li:before{content:"";background:var(--blue-on-dark);border-radius:50%;width:.5rem;height:.5rem;margin-right:.6rem;display:inline-block}.desktop-action{max-width:14rem}.desktop-hint{color:var(--muted-dark);margin-top:.7rem;font-size:.82rem;line-height:1.5}details{border-bottom:1px solid var(--line)}details:first-of-type{border-top:1px solid var(--line);margin-top:1.5rem}summary{cursor:pointer;padding:1.1rem 0;font-weight:700}details p{color:var(--muted);padding-bottom:1.1rem}.final{padding:clamp(3.5rem,8vw,5.5rem) 0}.site-footer{color:var(--muted-dark);background:var(--ink);border-top:1px solid var(--line-dark);padding:1.5rem 0;font-size:.88rem}.footer-row{align-items:center;gap:2rem;display:flex}.footer-row .brand{color:var(--paper)}.footer-row nav{gap:1.4rem;display:flex}.footer-row nav a{text-decoration:none}.footer-row nav a:hover{color:var(--paper)}.copy{margin-left:auto}.mobile-cta{display:none}@media (width<=960px){.hero-grid,.cards3,.codes-grid,.desktop-card{grid-template-columns:minmax(0,1fr)}.desktop-action{max-width:none}}@media (width<=720px){.site-nav{display:none}.site-header .btn{margin-left:auto}.node-off{margin-left:0}.footer-row{flex-wrap:wrap;gap:.8rem 1.5rem}body{padding-bottom:4.5rem}.mobile-cta{z-index:60;padding:.7rem var(--pad);border-top:1px solid var(--line-dark);background:#0b0e0df5;display:block;position:fixed;bottom:0;left:0;right:0}.mobile-cta .btn{width:100%}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}