*,:after,:before{box-sizing:border-box}body,html{height:100%;margin:0;-webkit-text-size-adjust:100%}:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;--radius:12px;--border:#222}@media (prefers-color-scheme:dark){:root{--bg:#0b0b0c;--panel:#141416;--ink:#fff;--muted:#b3b3b3;--line:hsla(0,0%,100%,.14)}}@media (prefers-color-scheme:light){:root{--bg:#f7f7f7;--panel:#fff;--ink:#111;--muted:#555;--line:rgba(0,0,0,.14)}}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:1001;height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 12px;background:var(--panel);color:var(--ink);border-bottom:1px solid var(--line)}.site-title{font-weight:700}.chat-page{min-height:100dvh;display:flex;flex-direction:column;background:var(--bg)}.chat-scroll{flex:1 1 auto;overflow-y:auto;padding:12px 12px calc(88px + env(safe-area-inset-bottom))}.messages{display:grid;grid-gap:10px;gap:10px}.msg{max-width:84%;padding:10px 12px;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);color:var(--ink);white-space:pre-wrap;word-wrap:break-word}.msg.user{margin-left:auto}.msg.bot{margin-right:auto}.chat-composer{position:fixed;left:0;right:0;bottom:0;z-index:1000;background:var(--bg);border-top:1px solid var(--line);padding:10px 12px calc(10px + env(safe-area-inset-bottom))}.composer-row{max-width:860px;margin:0 auto;display:flex;align-items:center;gap:8px}button,input,select,textarea{font-size:16px}.chat-input{flex:1 1;min-height:44px;padding:10px 12px;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);color:var(--ink);outline:none}.chat-input::placeholder{color:var(--muted)}.btn{height:44px;min-width:44px;padding:0 12px;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);color:var(--ink);display:inline-flex;align-items:center;justify-content:center}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-icon{width:44px;min-width:44px;padding:0}.btn-ghost{background:var(--bg)}.hidden-file{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.msg-img{display:block;max-width:100%;height:auto;border-radius:var(--radius);border:1px solid var(--line)}