:root{color-scheme:light;--ink:#142a43;--muted:#526276;--line:#d8e3ed;--blue:#1f5fa8;--paper:#f4f6f9;--white:#fff}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.75 system-ui,"Yu Gothic UI",sans-serif}
.wrap{width:min(1100px,calc(100% - 40px));margin:auto}
.header,.footer{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:18px 0}
.header{border-bottom:1px solid var(--line)}
.footer{border-top:1px solid var(--line);margin-top:58px;font-size:.86rem;color:var(--muted)}
nav,.actions{display:flex;align-items:center;gap:12px 22px;flex-wrap:wrap}
a{color:#174e91;text-underline-offset:.23em}
nav a,.logo{text-decoration:none}
nav a:hover,.logo:hover{text-decoration:underline}
.logo{display:inline-flex;gap:9px;align-items:center;font-weight:750;color:var(--ink)}
.logo img{border:1px solid var(--line);border-radius:8px}
.brand-row{display:flex;align-items:center;justify-content:space-between;flex:1;flex-wrap:wrap;gap:8px 10px;min-width:0}
.oss{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--blue);background:var(--blue);border-radius:999px;padding:3px 10px;font-size:12px;line-height:1.4;font-weight:600;color:var(--white);text-decoration:none;white-space:nowrap}
.oss:hover{background:#174e91;border-color:#174e91;text-decoration:underline}
.oss img{display:block;width:16px;height:16px;flex:none;object-fit:contain}
[aria-current=page]{font-weight:700;text-decoration:underline}
.language{border:1px solid var(--line);background:var(--white);border-radius:100px;padding:3px 12px}
.preview{display:inline-block;font-size:.76rem;color:var(--muted);border:1px solid var(--line);border-radius:100px;padding:1px 10px;margin:20px 0 0}
.hero{display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:center;padding:38px 0 54px}
h1{font-size:clamp(2rem,5.4vw,4rem);line-height:1.2;letter-spacing:-.035em;margin:8px 0 22px}
h2{font-size:clamp(1.25rem,3vw,1.7rem);line-height:1.35;margin:0 0 14px}
p{margin:0 0 14px}
.intro{max-width:58ch;color:var(--muted);font-size:1.12rem;margin-bottom:24px}
.kicker{color:#174e91;font-weight:750;font-size:.85rem;letter-spacing:.09em;margin:0}
.button{display:inline-block;background:#1f5fa8;color:white;border:0;border-radius:9px;padding:10px 16px;font:inherit;font-weight:700;text-decoration:none;cursor:pointer}
.button:hover{background:#174e91}
.example,.note,.steps li{border:1px solid var(--line);background:var(--white);border-radius:16px;padding:22px}
main > .note + .note{margin-top:24px}
.example p:not(.kicker){margin:12px 0 4px;font-size:.85rem;font-weight:700;color:var(--muted)}
.bubble{border-radius:12px;background:#e5effa;padding:11px 14px}
.received{background:#edf3f7}
.example .reply{margin:0;padding-left:1.6em}
.example .reply li{margin:.15em 0}
.example p.reply-note{margin:10px 0 0;font-weight:400}
.flow{color:var(--blue);text-align:center;font-size:1.1rem;line-height:1.4;margin-top:8px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding:0;list-style:none;counter-reset:steps;margin:0 0 30px}
.steps li{counter-increment:steps}
.steps li::before{content:counter(steps,decimal-leading-zero);display:block;color:var(--blue);font-weight:750;margin-bottom:6px}
.steps p{color:var(--muted);margin:5px 0 0}
.reading{max-width:720px;padding-top:22px}
.reading h1{font-size:clamp(2rem,5vw,3.2rem)}
.reading section{margin:25px 0}
.reading ul{padding-left:1.4em}
label{display:block;font-weight:700;margin-top:14px}
input,select,textarea{display:block;width:100%;border:1px solid #9baaba;border-radius:8px;background:white;color:var(--ink);padding:9px 12px;font:inherit}
textarea{resize:vertical}
#preview-status,#form-result{color:var(--muted);font-size:.9rem;margin:10px 0}
:focus-visible{outline:3px solid #bf6900;outline-offset:4px}
.skip{position:absolute;left:12px;top:8px;transform:translateY(-160%);background:white;padding:5px 12px;z-index:1}
.skip:focus{transform:none}
@media(max-width:720px){.wrap{width:calc(100% - 28px)}.hero,.steps{grid-template-columns:1fr}.hero{gap:20px;padding:26px 0 38px}.header{gap:8px}.brand-row{flex-basis:100%}nav{gap:8px 13px;font-size:.9rem}}