*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:#1a1a1a;background:#f6f6f4}
.app{display:flex;flex-direction:column;height:100vh;height:100dvh;max-width:760px;margin:0 auto;background:#fff}
header{padding:16px 20px;border-bottom:1px solid #e6e6e2}
h1{margin:0;font-size:1.25rem}
header p{margin:4px 0 0;color:#666;font-size:.92rem}
main{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px}
.msg{max-width:85%;padding:10px 14px;border-radius:14px;white-space:pre-wrap;word-wrap:break-word}
.assistant{align-self:flex-start;background:#f0f0ec}
.user{align-self:flex-end;background:#1a1a1a;color:#fff}
.error{align-self:center;color:#a33;font-size:.9rem}
.typing{color:#888;font-style:italic}
footer{padding:12px 16px calc(12px + env(safe-area-inset-bottom));border-top:1px solid #e6e6e2}
form{display:flex;gap:8px}
textarea{flex:1;resize:none;font:inherit;padding:10px 12px;border:1px solid #ccc;border-radius:10px;max-height:160px}
button{font:inherit;padding:0 18px;border:0;border-radius:10px;background:#1a1a1a;color:#fff;cursor:pointer}
button:disabled{opacity:.5;cursor:default}
.link{background:none;color:#666;padding:6px 0 0;font-size:.85rem;text-decoration:underline}
#ts:empty{display:none}
#ts{margin-bottom:8px}
.register{flex:1;overflow-y:auto;padding:20px}
.register .intro{margin:0 0 12px;color:#444}
#regform{display:flex;flex-direction:column;gap:12px;max-width:420px}
#regform label{display:flex;flex-direction:column;gap:4px;font-size:.9rem;color:#333}
#regform input:not([type=checkbox]){font:inherit;padding:10px 12px;border:1px solid #ccc;border-radius:10px}
#regform .consent{flex-direction:row;align-items:flex-start;gap:8px}
#regform .consent input{margin-top:4px}
#regform button{padding:12px 18px;align-self:flex-start}
#regerror:empty{display:none}
#regerror{margin:0;align-self:flex-start}
[hidden]{display:none!important}