:root{--bg:#0f172a;--surface:#16213a;--surface-alt:#1c2b4a;--text:#e8ecf5;--text-dim:#9aa5c0;--accent:#5b8cff;--user-bubble:#2b3e66;--ai-bubble:#1c2b4a;--correction:#2c1f3a;--border:#263356;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px)}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--text);overscroll-behavior-y:none;height:100%;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.app-shell{flex-direction:column;width:100%;max-width:720px;height:100dvh;margin:0 auto;display:flex}.app-header{padding:calc(12px + var(--safe-top)) 16px 12px;border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;gap:8px;display:flex}.app-header h1{margin:0;font-size:clamp(15px,4vw,18px);font-weight:600}.scenario-btn{color:var(--text-dim);cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:6px;max-width:220px;padding:2px 0 0;font-size:12.5px;display:flex}.chip{background:var(--surface-alt);color:var(--text-dim);border-radius:999px;flex-shrink:0;padding:1px 8px;font-size:11px}.mode-select{flex-wrap:wrap;gap:6px;display:flex}.mode-btn{background:var(--surface);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;border-radius:999px;min-height:32px;padding:6px 12px;font-size:13px}.mode-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.messages{-webkit-overflow-scrolling:touch;flex-direction:column;flex:1;gap:12px;padding:16px;display:flex;overflow-y:auto}.bubble-row{width:100%;display:flex}.bubble-row.user{justify-content:flex-end}.bubble{word-wrap:break-word;white-space:pre-wrap;border-radius:16px;max-width:min(85%,560px);padding:10px 14px;font-size:15px;line-height:1.45}.bubble-row.user .bubble{background:var(--user-bubble);border-bottom-right-radius:4px}.bubble-row.ai .bubble{background:var(--ai-bubble);border-bottom-left-radius:4px}.feedback-card{background:var(--correction);max-width:min(85%,560px);color:var(--text-dim);border:1px solid #3b2a52;border-radius:12px;padding:10px 14px;font-size:13.5px}.feedback-card b{color:var(--text)}.typing{color:var(--text-dim);padding:0 16px;font-size:13px}.composer{border-top:1px solid var(--border);padding:10px 12px calc(10px + var(--safe-bottom));background:var(--bg);flex-shrink:0;align-items:flex-end;gap:8px;display:flex}.composer textarea{resize:none;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:14px;flex:1;min-height:44px;max-height:140px;padding:10px 14px;font-family:inherit;font-size:16px;line-height:1.4}.composer textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.send-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:12px;flex-shrink:0;min-width:48px;min-height:44px;font-size:15px;font-weight:600}.send-btn:disabled{opacity:.5;cursor:default}.mic-btn{background:var(--surface-alt);font-size:18px}.mic-btn.recording{background:#d64545;animation:1.4s ease-in-out infinite pulse}@keyframes pulse{0%,to{box-shadow:0 0 #d6454580}50%{box-shadow:0 0 0 8px #d6454500}}.sheet-overlay{z-index:50;background:#0000008c;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.sheet{background:var(--bg);border:1px solid var(--border);border-bottom:none;border-radius:16px 16px 0 0;flex-direction:column;width:100%;max-width:720px;max-height:min(80vh,80dvh);display:flex;overflow:hidden}.sheet-header{border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.sheet-header h2{margin:0;font-size:16px}.sheet-close{background:var(--surface);border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:50%;width:32px;height:32px;font-size:14px}.sheet-body{padding:8px 12px calc(16px + var(--safe-bottom));-webkit-overflow-scrolling:touch;overflow-y:auto}.scenario-group{margin-bottom:12px}.scenario-group-title{text-transform:uppercase;letter-spacing:.04em;color:var(--text-dim);padding:10px 8px 6px;font-size:12px}.scenario-row{background:var(--surface);border:1px solid var(--border);width:100%;color:var(--text);cursor:pointer;text-align:left;border-radius:10px;justify-content:space-between;align-items:center;gap:8px;min-height:44px;margin-bottom:6px;padding:12px 14px;font-size:14px;display:flex}.scenario-row.active{border-color:var(--accent);background:var(--surface-alt)}.empty-state{text-align:center;color:var(--text-dim);margin:auto;padding:24px;font-size:14px}@media (max-width:380px){.bubble{font-size:14px}.app-header{padding-left:12px;padding-right:12px}}.usage-summary{gap:12px;display:flex}.usage-stat{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:12px;flex:1;padding:14px}.usage-stat-value{font-size:22px;font-weight:700}.usage-stat-label{color:var(--text-dim);margin-top:2px;font-size:12px}.usage-row{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 14px}.usage-row-header{align-items:center;gap:8px;margin-bottom:6px;display:flex}.usage-model{color:var(--text-dim);word-break:break-all;font-size:13px}.usage-row-body{color:var(--text-dim);flex-wrap:wrap;gap:10px;font-size:13px;display:flex}.usage-row-cost{color:var(--text);margin-left:auto;font-weight:600}