:root{--bg:#f7f4ef;--surface:#ffffff;--ink:#23201c;--ink-soft:#6b6258;--accent:#b5613a;--accent-soft:#f0e3da;--user-bubble:#2c2823;--user-ink:#f7f4ef;--border:#e7e0d6;--danger:#a23b2d;--radius:16px;--maxw:760px;--font:ui-sans-serif,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,"Inter",sans-serif}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;height:100%}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:var(--surface);border-bottom:1px solid var(--border)}.topbar-inner{max-width:var(--maxw);margin:0 auto;padding:12px 18px;display:flex;flex-direction:column;gap:4px}.brand{display:flex;align-items:center;gap:9px}.brand-dot{width:12px;height:12px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.brand-name{font-weight:700;letter-spacing:-.01em}.origin-line{margin:0;font-size:13px;line-height:1.5;color:var(--ink)}.origin-line strong{color:var(--accent)}.disclaimer{margin:0;font-size:12.5px;line-height:1.45;color:var(--ink-soft)}.shell{max-width:var(--maxw);margin:0 auto;padding:0 14px;display:flex;flex-direction:column;height:calc(100dvh - 64px)}.gate-wrap{flex:1 1;display:flex;align-items:center;justify-content:center}.gate-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px 26px;max-width:380px;width:100%;text-align:center}.gate-card h1{font-size:19px;margin:0 0 6px}.gate-card p{color:var(--ink-soft);font-size:14px;margin:0 0 18px}.gate-card input{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:12px;font-size:15px;margin-bottom:12px}.gate-card input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}.gate-err{color:var(--danger);font-size:13px;margin:-4px 0 12px}.thread{flex:1 1;overflow-y:auto;padding:20px 2px 12px;gap:16px}.msg,.thread{display:flex;flex-direction:column}.msg{max-width:86%}.msg.user{align-self:flex-end;align-items:flex-end}.msg.assistant{align-self:flex-start;align-items:flex-start}.bubble{padding:12px 15px;border-radius:var(--radius);font-size:15.5px;line-height:1.55;white-space:pre-wrap;word-wrap:break-word}.msg.assistant .bubble{background:var(--surface);border:1px solid var(--border);border-bottom-left-radius:5px}.msg.user .bubble{background:var(--user-bubble);color:var(--user-ink);border-bottom-right-radius:5px}.who{font-size:11.5px;color:var(--ink-soft);margin:0 4px 5px;font-weight:600;letter-spacing:.02em;text-transform:uppercase}.typing{display:inline-flex;gap:4px;padding:4px 2px}.typing span{width:7px;height:7px;border-radius:50%;background:var(--ink-soft);opacity:.5;animation:blink 1.2s infinite both}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.25}40%{opacity:.9}}.grade{margin:8px 4px 0;font-size:12.5px;color:var(--ink-soft);display:flex;flex-direction:column;gap:7px}.grade-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.grade-label{font-size:12px}.grade-btns{display:flex;gap:5px}.grade-btn{width:30px;height:30px;border-radius:8px;border:1px solid var(--border);background:var(--surface);cursor:pointer;font-size:13px;color:var(--ink);transition:all .12s ease}.grade-btn.picked,.grade-btn:hover{border-color:var(--accent)}.grade-btn.picked{background:var(--accent);color:#fff}.grade-note-toggle{background:none;border:none;color:var(--accent);cursor:pointer;font-size:12px;padding:0;text-decoration:underline}.grade textarea{width:100%;max-width:420px;border:1px solid var(--border);border-radius:10px;padding:8px 10px;font-size:13px;font-family:var(--font);resize:vertical}.grade-thanks{color:var(--accent);font-weight:600}.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0 2px 10px}.chip{border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:7px 14px;font-size:13.5px;cursor:pointer;color:var(--ink);transition:all .12s ease}.chip:hover{border-color:var(--accent);color:var(--accent)}.composer{display:flex;gap:9px;align-items:flex-end;padding:10px 2px 16px;background:var(--bg)}.composer textarea{flex:1 1;border:1px solid var(--border);border-radius:14px;padding:12px 14px;font-size:15.5px;font-family:var(--font);resize:none;max-height:160px;background:var(--surface);line-height:1.5}.composer textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}.send-btn{border:none;background:var(--accent);color:#fff;border-radius:14px;padding:0 18px;height:46px;font-size:15px;font-weight:600;cursor:pointer;transition:opacity .12s ease}.send-btn:disabled{opacity:.45;cursor:default}.fade-in{animation:fade .25s ease}@keyframes fade{0%{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}@media (max-width:520px){.msg{max-width:94%}.disclaimer{font-size:12px}}