:root{color-scheme:light;--bg: #ffffff;--panel: #f7faf9;--panel-strong: #eef7f2;--surface: #ffffff;--surface-soft: #f6f8f7;--border: #dbe4e1;--border-soft: #edf2f0;--text: #0b1220;--body: #273142;--muted: #667085;--muted-strong: #475467;--accent: #078a4f;--accent-dark: #056b3e;--accent-soft: #e8f6ef;--amber: #c27a10;--danger: #b42318;--shadow: 0 18px 60px rgba(15, 23, 42, .08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;background:var(--bg);color:var(--text)}button,input,textarea{font:inherit}button{cursor:pointer}.loading,.login-screen{min-height:100svh;display:grid;place-items:center;background:linear-gradient(180deg,#fff,#f7faf9)}.loading{font-size:28px;font-weight:760;color:var(--accent)}.login-card{width:min(400px,calc(100vw - 32px));border:1px solid var(--border);border-radius:8px;background:var(--surface);padding:30px;box-shadow:var(--shadow)}.brand{display:flex;align-items:center;gap:12px;font-size:24px;font-weight:760;letter-spacing:0}.brand-mark,.avatar{display:grid;place-items:center;flex:0 0 auto;color:#fff;background:var(--accent)}.brand-mark{width:34px;height:34px;border-radius:8px}.login-brand{margin-bottom:26px}.login-card label{display:grid;gap:7px;margin-bottom:16px;color:#344054;font-size:13px;font-weight:650}.login-card input{height:44px;border:1px solid var(--border);border-radius:8px;padding:0 12px;outline:none}.login-card input:focus,.composer textarea:focus{border-color:#078a4f8c;box-shadow:0 0 0 3px #078a4f1a}.login-button,.new-chat,.send-button{border:0;background:var(--accent);color:#fff;font-weight:700;transition:background .16s ease,transform .16s ease}.login-button{width:100%;height:44px;border-radius:8px}.login-button:hover,.new-chat:hover,.send-button:hover{background:var(--accent-dark)}.login-error{margin:0 0 14px;color:var(--danger);font-size:14px}.shell{display:grid;grid-template-columns:286px minmax(0,1fr);height:100svh;overflow:hidden;background:var(--bg)}.sidebar{display:flex;flex-direction:column;min-height:0;border-right:1px solid var(--border);background:var(--panel);padding:24px 18px}.new-chat{display:flex;align-items:center;justify-content:center;gap:9px;width:100%;min-height:46px;margin:28px 0 24px;border-radius:7px;font-size:15px}.history-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:0 4px 10px;color:var(--muted);font-size:13px;font-weight:680}.history-head small{color:#98a2b3;font-size:12px;font-weight:640}.history-list{display:grid;align-content:start;gap:3px;overflow:auto;padding-right:2px}.history-item{display:grid;grid-template-columns:20px minmax(0,1fr) 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auto;align-items:center;gap:14px;border-bottom:1px solid var(--border);padding:0 34px;background:#fffffff0}.menu-button{display:none}.icon-button{display:grid;place-items:center;width:38px;height:38px;border-radius:8px}.topbar .menu-button{display:none}.topbar-title{min-width:0}.topbar h1{margin:0;max-width:62vw;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;font-size:17px;line-height:1.2}.topbar p{display:flex;align-items:center;gap:8px;min-width:0;margin:6px 0 0;overflow:hidden;color:var(--muted);font-size:12px;white-space:nowrap}.topbar p i{width:1px;height:12px;background:var(--border)}.dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}.account{display:flex;align-items:center;gap:10px;min-width:0;color:#1f2937}.account span{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-size:13px;font-weight:760}.account 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12px}.control-row:first-child{border-top:0}.control-label{display:flex;align-items:center;gap:8px;min-width:0;color:var(--body);font-size:13px;font-weight:700}.control-label svg{color:var(--accent)}.control-label strong{display:none;margin-left:auto;overflow:hidden;color:var(--muted);font-size:12px;font-weight:650;text-overflow:ellipsis;white-space:nowrap}.segments{display:flex;flex-wrap:wrap;gap:8px;min-width:0}.segments button{min-width:86px;min-height:32px;border:1px solid var(--border);border-radius:7px;background:var(--surface);color:var(--body);padding:0 12px;font-size:13px;font-weight:650}.segments button.selected{border-color:var(--accent);background:var(--accent);color:#fff}.mobile-nav,.composer-status{display:none}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:30;display:grid;place-items:center;background:#f7faf9eb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.lightbox img{max-width:min(1100px,82vw);max-height:78svh;border-radius:8px;box-shadow:0 22px 80px #0f172a2e}.lightbox-close,.lightbox-nav{position:absolute;display:grid;place-items:center;width:42px;height:42px;border:1px solid var(--border);border-radius:50%;background:var(--surface);color:#1f2937}.lightbox-close{top:28px;right:28px}.lightbox-nav.left{left:36px}.lightbox-nav.right{right:36px}.lightbox-nav:disabled{opacity:.35;cursor:not-allowed}.lightbox-download{position:absolute;bottom:28px;height:42px;border:1px solid var(--border);border-radius:8px;background:var(--surface);padding:0 14px}@media(max-width:980px){.shell{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 auto 0 0;z-index:24;width:min(320px,86vw);transform:translate(-104%);transition:transform .18s ease;box-shadow:18px 0 50px #0f172a24}.history-open .sidebar{transform:translate(0)}.drawer-scrim{position:fixed;top:0;right:0;bottom:0;left:0;z-index:23;display:none;border:0;background:#0f172a33}.history-open .drawer-scrim{display:block}.main{grid-template-rows:70px minmax(0,1fr) auto}.topbar .menu-button{display:grid}.topbar{padding:0 14px}.topbar h1{max-width:100%;font-size:16px}.topbar p{gap:6px}.account{gap:0}.account strong{display:none}.messages{padding:12px 18px 14px}.message,.message.user{grid-template-columns:34px minmax(0,1fr);gap:12px;padding:18px 0}.message.user{justify-content:stretch}.message.user .avatar{order:0}.message.user .message-body{order:0;padding:14px}.avatar{width:34px;height:34px}.markdown{font-size:15px;line-height:1.7}.prompt-grid{grid-template-columns:1fr}.empty-state h2{font-size:23px}.composer{width:100%;margin:0;padding:0 12px 10px;background:linear-gradient(180deg,#fff0,#fff 16px)}.composer-box{padding:12px}.composer textarea{min-height:72px}.runtime-controls{margin-top:8px}.control-row{grid-template-columns:1fr;gap:8px;padding:10px}.control-label strong{display:block}.segments{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.segments button{min-width:0;padding:0 6px;font-size:12px}.control-row:nth-child(3) .segments{grid-template-columns:repeat(2,minmax(0,1fr))}.mobile-nav{display:grid;grid-template-columns:repeat(3,1fr);margin-top:8px;padding:7px 8px}.mobile-nav button{display:grid;place-items:center;gap:3px;min-height:44px;border:0;border-radius:7px;background:transparent;color:var(--muted);font-size:12px;font-weight:700}.mobile-nav button.active{color:var(--accent);background:var(--accent-soft)}.composer-status{display:inline-flex;align-items:center;gap:7px;margin:8px 2px 0;color:var(--muted);font-size:12px;font-weight:700}.composer-status span{width:8px;height:8px;border-radius:50%;background:#98a2b3}.composer-status.generating{color:var(--amber)}.composer-status.generating span{background:var(--amber)}.file-card{grid-template-columns:40px minmax(0,1fr);gap:12px;padding:13px}.file-icon{width:40px;height:40px}.file-card a{grid-column:2;width:fit-content;min-height:34px}.lightbox img{max-width:90vw;max-height:72svh}}@media(max-width:430px){.topbar{gap:8px}.messages{padding-inline:14px}.message,.message.user{grid-template-columns:1fr}.avatar,.message-meta time{display:none}.topbar p{max-width:220px}.segments button{font-size:11px}.composer-actions{align-items:flex-end}.tool-row{gap:4px}}