:root{font-family:'Pretendard Variable',Pretendard,sans-serif;color:#161615;background:#F7F7F5;font-synthesis:none;--ink:#161615;--line:#E2E2DC;--muted:#66665F}
*{box-sizing:border-box}body{margin:0;overflow:hidden}button,a,textarea{-webkit-tap-highlight-color:transparent}button,textarea{font:inherit}
button{cursor:pointer;border:1px solid var(--line);border-radius:2px;background:#fff;color:inherit;padding:8px 11px;min-height:36px;white-space:nowrap}
button:hover{background:#EFEFEC}button:disabled{opacity:.45;cursor:default}a{color:inherit}
button:focus-visible,a:focus-visible,textarea:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.primary{background:var(--ink);border-color:var(--ink);color:#fff;font-weight:500}.primary:hover{background:#363632}
svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7;flex-shrink:0}
.workspace{display:grid;grid-template-columns:minmax(0,1fr) 340px;height:100dvh}.ai-hidden .workspace{grid-template-columns:minmax(0,1fr)}
.sheet-panel{display:flex;flex-direction:column;min-width:0;min-height:0}
.sheet-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:54px;padding:8px 12px;background:#fff;border-bottom:1px solid var(--line)}
.toolbar-document{display:flex;align-items:center;gap:14px;min-width:0;flex:1}
.back{display:flex;align-items:center;justify-content:center;width:28px;min-height:36px;text-decoration:none;color:var(--muted);flex-shrink:0;border-radius:2px}.back:hover{background:#EFEFEC}
h1{font-size:14px;margin:0;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toolbar-actions{display:flex;align-items:center;gap:4px}.export-button{color:var(--ink)}
.tool-button{position:relative}.tool-button::after{content:attr(data-tooltip);position:absolute;z-index:10;top:calc(100% + 7px);right:0;padding:6px 8px;border-radius:2px;background:#1F1F1D;color:#fff;font-size:11px;font-weight:400;line-height:1.4;white-space:nowrap;pointer-events:none;visibility:hidden;opacity:0}.back::after{left:0;right:auto}
.tool-button:focus-visible::after{visibility:visible;opacity:1}@media(hover:hover){.tool-button:hover::after{visibility:visible;opacity:1}}
#grid-container{position:relative;flex:1;min-height:0;background:#fff;overflow:hidden}
iframe{border:0;width:100%;height:100%;display:block}#grid-container iframe{position:absolute;inset:0}
.loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#fff;z-index:1;font-size:13px}.loading span{font-size:11px;color:var(--muted)}
.spinner{width:24px;height:24px;border:2px solid #E2E2DC;border-top-color:var(--ink);border-radius:50%;animation:spin .9s linear infinite}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.ai-panel{display:flex;flex-direction:column;min-height:0;background:#fff;border-left:1px solid var(--line)}
.panel-controls{display:flex;align-items:center;justify-content:space-between;min-height:54px;padding:8px 14px}
.panel-controls h2{font-size:13px;margin:0;font-weight:500}.icon-button{display:flex;align-items:center;justify-content:center;width:36px;height:36px;min-height:36px;padding:8px;border-color:transparent;flex-shrink:0}.icon-button.primary{background:var(--ink);color:#fff}.icon-button.primary:hover{background:#363632}
.conversation{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;padding:0 20px 24px;scroll-behavior:smooth}
.intro{padding-top:28px}.intro .intro-kicker{display:flex;align-items:center;gap:7px;margin:0 0 24px;font-size:12px;color:var(--muted);font-weight:500}.intro-kicker span{font-size:24px;line-height:1}
.intro h3{font-size:21px;letter-spacing:-.025em;line-height:1.4;margin:0 0 12px}.intro p{font-size:13px;line-height:1.8;color:var(--muted)}
#ai-form{padding:16px}.composer{padding:12px;background:#EFEFEC;border-radius:2px}.composer:focus-within{outline:2px solid #9A9A92;outline-offset:0}
.composer textarea{display:block;width:100%;resize:none;min-height:64px;max-height:180px;line-height:1.6;font-size:13px;padding:0;border:0;color:inherit;background:transparent}.composer textarea:focus-visible{outline:none}.composer textarea::placeholder{color:#7A7A73}
.composer-actions{display:flex;justify-content:flex-end;padding-top:8px}.composer-actions .icon-button{width:32px;height:32px;min-height:32px;padding:7px;border-radius:50%}.composer-actions .tool-button::after{top:auto;bottom:calc(100% + 7px)}
.message{margin-top:20px;font-size:13px;line-height:1.75;white-space:pre-wrap;overflow-wrap:anywhere}.message strong{display:block;font-size:10px;letter-spacing:.02em;color:var(--muted);margin-bottom:5px}.message.user{background:#EFEFEC;border-radius:2px;padding:12px 14px}.message.error{color:#a33428}
.changes{display:flex;gap:5px;flex-wrap:wrap;margin-top:8px}.changes button{font-size:10px;padding:4px 7px;min-height:28px;color:var(--ink)}
.stage-frame{position:fixed;left:-4000px;top:0;width:1100px;height:700px;pointer-events:none;opacity:0}
.ai-backdrop{position:fixed;inset:0;z-index:2;border:0;border-radius:0;padding:0;background:#16161540}.ai-backdrop:hover{background:#16161540}
#editor-error{padding:10px;color:#a33428;font-size:12px;overflow-wrap:anywhere}
[hidden]{display:none!important}@keyframes spin{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.spinner{animation:none}.conversation{scroll-behavior:auto}}
@media(max-width:1100px){.toolbar-document{gap:8px}}
@media(max-width:900px){.workspace{grid-template-columns:minmax(0,1fr)}.ai-panel{position:fixed;z-index:3;top:0;right:0;bottom:0;width:min(360px,100%);box-shadow:-8px 0 32px #1616151a}.panel-controls{min-height:54px}.panel-controls button{width:38px;min-height:38px}}
@media(max-width:650px){.sheet-toolbar{gap:6px;padding:6px 8px;min-height:50px}.toolbar-document{gap:4px}.back{width:24px}.back svg{width:16px}h1{font-size:12px}.toolbar-actions{gap:2px}.toolbar-actions .icon-button{width:34px;height:36px;padding:8px}.ai-panel{width:min(360px,100%)}.conversation{padding:0 16px 20px}#ai-form{padding:12px;padding-bottom:max(12px,env(safe-area-inset-bottom))}}