:root{--bg:#f4f7fb;--card:#fff;--ink:#0f172a;--muted:#64748b;--line:#e5e7eb;--blue:#2563eb;--purple:#7c3aed;--danger:#dc2626}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{height:58px;display:flex;align-items:center;gap:10px;justify-content:space-between;padding:8px 12px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.title{min-width:0;text-align:center}.title b{display:block;font-size:18px;line-height:1.1}.title span{display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-size:12px;margin-top:4px}.title span:before{content:"";width:7px;height:7px;border-radius:50%;background:#22c55e}button{border:0;border-radius:12px;padding:10px 13px;background:var(--blue);color:white;font-weight:800;cursor:pointer;font-size:14px}button:active{transform:scale(.98)}button.danger{background:#fee2e2;color:#991b1b}#settingsBtn,#newBtn,#closeSettingsBtn,#applyPresetBtn,#quotaBtn,#testBtn{background:#eef2ff;color:#1e3a8a}.chat{flex:1;min-height:0;display:flex;flex-direction:column}.messages{flex:1;min-height:0;overflow:auto;padding:16px 12px;background:linear-gradient(180deg,#f8fbff,#eef3f9)}.empty{max-width:560px;margin:16vh auto 0;text-align:center;background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px 20px;box-shadow:0 16px 45px rgba(15,23,42,.08)}.empty .logo{width:62px;height:62px;margin:0 auto 14px;border-radius:20px;display:grid;place-items:center;color:white;font-size:28px;font-weight:900;background:linear-gradient(135deg,var(--blue),var(--purple))}.empty h1{margin:0;font-size:30px;letter-spacing:-.04em}.empty p{margin:10px 0 0;color:var(--muted);line-height:1.7}.tips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:16px}.tips span{font-size:12px;font-weight:800;background:#dbeafe;color:#1e40af;border-radius:999px;padding:7px 10px}.msg{display:flex;gap:9px;margin:12px 0;align-items:flex-end}.msg.user{flex-direction:row-reverse}.avatar{width:32px;height:32px;border-radius:12px;display:grid;place-items:center;flex:0 0 auto;font-size:12px;font-weight:900;background:#e0e7ff;color:#3730a3}.user .avatar{background:linear-gradient(135deg,var(--blue),var(--purple));color:white}.bubble{max-width:min(760px,82%);background:white;border:1px solid var(--line);border-radius:18px;padding:12px 14px;line-height:1.75;white-space:pre-wrap;word-break:break-word;box-shadow:0 8px 20px rgba(15,23,42,.05)}.user .bubble{background:linear-gradient(135deg,var(--blue),var(--purple));color:white;border-color:transparent}.usage{font-size:12px;color:#94a3b8;border-top:1px dashed #cbd5e1;margin-top:8px;padding-top:6px}.composer{display:flex;gap:8px;padding:10px 12px;background:#fff;border-top:1px solid var(--line);padding-bottom:max(10px,env(safe-area-inset-bottom))}.composer textarea{flex:1;height:48px;min-height:48px;max-height:130px;resize:none;border:1px solid var(--line);border-radius:15px;padding:12px;font:inherit;font-size:16px;outline:none;background:#f8fafc}.composer textarea:focus{border-color:#93c5fd;box-shadow:0 0 0 3px rgba(37,99,235,.1)}.composer button{width:72px;border-radius:15px;background:linear-gradient(135deg,var(--blue),var(--purple))}.settings{position:fixed;left:0;top:0;bottom:0;width:min(360px,88vw);z-index:30;background:white;border-right:1px solid var(--line);box-shadow:0 24px 70px rgba(15,23,42,.22);padding:14px;overflow:auto;display:flex;flex-direction:column;gap:9px}.hidden{display:none!important}.settingsHead{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:6px}.settingsHead b{font-size:20px}.settingsHead p{margin:3px 0 0;color:var(--muted);font-size:12px}label{font-size:12px;color:#475569;font-weight:800}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:12px;padding:11px;font:inherit;font-size:16px;background:#fff}.settings textarea{min-height:80px;resize:vertical}.btnGrid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.hint,.version{font-size:12px;line-height:1.6;color:var(--muted)}.mask{position:fixed;inset:0;background:rgba(15,23,42,.38);z-index:20}@media(min-width:900px){.app{max-width:1180px;margin:0 auto;padding:18px;height:100vh}.topbar{border-radius:20px 20px 0 0;position:relative}.chat{border:1px solid var(--line);border-top:0;border-radius:0 0 20px 20px;overflow:hidden;background:#fff}.settings{top:18px;bottom:18px;left:calc(50% - 590px);border-radius:20px}.bubble{max-width:72%}}@media(max-width:520px){.topbar{height:54px;padding:7px 8px}.title b{font-size:16px}button{padding:9px 10px;font-size:13px}.messages{padding:12px 9px}.bubble{max-width:84%;font-size:15px;padding:10px 12px}.avatar{width:28px;height:28px;border-radius:10px}.empty{margin-top:13vh;padding:22px 16px}.empty h1{font-size:26px}.composer{padding:8px}.composer button{width:64px}.settings{width:90vw}}