:root{color-scheme:light;--ink:#244b45;--text:#243731;--muted:#536861;--line:#d9e1d8;--wash:#edf2ea;--paper:#f6f5ef}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--paper);color:var(--text);font:16px/1.5 system-ui,-apple-system,sans-serif}
.card{margin:24px auto;max-width:640px;width:calc(100% - 28px);background:#fff;border:1px solid var(--line);border-radius:24px;padding:clamp(16px,5vw,32px)}
.brand{display:inline-flex}.brand img{max-width:128px;height:auto}.eyebrow{font-size:.83rem;font-weight:700;letter-spacing:.08em;color:var(--muted);margin:.8rem 0 .3rem}
h1,h2{margin:0;color:var(--ink);line-height:1.18}h1{font:clamp(1.8rem,6vw,2.7rem)/1.1 Georgia,serif}
p{margin:.6rem 0}.intro,.hint,footer{color:var(--muted)}.intro{margin:.7rem 0 1.15rem}
fieldset{min-width:0;border:0;margin:0 0 .85rem;padding:0;display:grid;grid-template-columns:1.35fr 1fr;gap:12px}
label{display:grid;gap:6px;font-weight:650;font-size:.92rem;min-width:0}
input,select,textarea{max-width:100%;width:100%;font:16px/1.35 system-ui;color:var(--text);border:1px solid #b7c4bc;border-radius:10px;padding:10px 12px;background:white}
textarea{min-height:82px;resize:vertical}.hint,.notice{font-size:.87rem}.notice{color:#8b2f25}
button{cursor:pointer;font:inherit;min-height:44px;padding:.55rem .9rem;border:1px solid var(--line);border-radius:11px;font-weight:700}
button:disabled{opacity:.55;cursor:default}.primary{color:white;background:var(--ink);border-color:var(--ink)}.quiet{background:white;color:var(--ink)}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,#messages:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
#conversation{border:1px solid var(--line);border-radius:14px;margin-bottom:1rem;overflow:hidden;background:#f9faf7}
.conversation-head{padding:9px 12px;display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;background:var(--wash)}
#chatStatus{font-size:.85rem;color:var(--muted)}
#older{margin:8px 12px 0}#messages{max-height:min(48vh,420px);min-height:110px;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:10px;overscroll-behavior:contain}
.message{align-self:flex-start;max-width:94%;border-radius:12px;background:white;border:1px solid var(--line);padding:9px 12px;overflow-wrap:anywhere}
.message.mine{align-self:flex-end;background:#e8f0e4}
.message header{display:flex;flex-wrap:wrap;gap:5px 10px;font-size:.78rem;color:var(--muted)}
.message p{margin:4px 0 0;white-space:pre-wrap}
footer{margin-top:1.1rem;border-top:1px solid var(--line);padding-top:.8rem;font-size:.88rem}a{color:var(--ink)}
dialog{max-width:min(390px,calc(100% - 24px));border:1px solid var(--line);border-radius:16px;padding:20px;color:var(--text)}
dialog::backdrop{background:#10292380}
@media(max-width:450px){.card{margin:12px auto;border-radius:18px}fieldset{grid-template-columns:1fr;gap:10px}}