:root{--accent: #007acc;--bg-light: #272822;--bg-editor: #272822;--border-color: #3e3d32;--text-dark: #f8f8f2;--header-bg: #1e1f1c}body.light-mode{--accent: #0078d4;--bg-light: #fafafa;--bg-editor: #fafafa;--border-color: #e0e0e0;--text-dark: #292524;--header-bg: #f5f5f5}body,html{margin:0;padding:0;height:100%;width:100%;background:var(--bg-light);color:var(--text-dark);overflow:hidden;font-family:Pretendard,sans-serif}.header{position:absolute;top:0;left:0;right:0;background:var(--header-bg);height:45px;display:flex;align-items:center;justify-content:space-between;padding:0 15px;border-bottom:1px solid var(--border-color);z-index:10;transition:all .35s ease}body.header-hidden .header{transform:translateY(-100%);opacity:0;height:0;padding:0;margin:0;overflow:hidden;pointer-events:none}.header-title{font-weight:600;font-size:.8rem;color:var(--text-dark)}.header-left{display:flex;align-items:center;gap:12px}.home-btn{text-decoration:none;font-size:1.2rem;transition:transform .2s}.home-btn:hover{transform:scale(1.1)}#toolbar{display:flex;align-items:center;gap:12px;background:var(--bg-editor);padding:4px 12px;border-radius:20px;font-size:.7rem;color:var(--text-dark)}.editor-wrapper{margin-top:45px;height:calc(100% - 45px);background:var(--bg-editor);transition:all .35s ease}body.header-hidden .editor-wrapper{margin-top:0;height:100%}.CodeMirror{height:100%;font-family:JetBrains Mono,Fira Code,SF Mono,Consolas,Monaco,Courier New,monospace;font-size:14px;background:var(--bg-editor);line-height:1.3}#header-toggle{position:fixed;top:32px;right:16px;z-index:9999;width:28px;height:28px;background:#2d3741a6;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:#d1d5db;font-size:18px;line-height:28px;text-align:center;border-radius:50%;border:1px solid rgba(100,116,139,.4);cursor:pointer;transition:all .18s ease;opacity:.1;box-shadow:0 2px 6px #00000026;-webkit-user-select:none;user-select:none;display:flex;align-items:center;justify-content:center}#header-toggle:hover{opacity:1;background:#3c4650d9;color:#f3f4f6;transform:scale(1.08);box-shadow:0 4px 12px #00000038}#header-toggle:active{transform:scale(.96)}#nickname-modal{position:fixed;top:0;right:0;bottom:0;left:0;background:#fafaf9;display:flex;align-items:center;justify-content:center;z-index:2000}.modal-content{background:#fff;padding:40px;border-radius:12px;border:1px solid #e7e5e4;box-shadow:0 4px 12px #0000001a;text-align:center;width:340px}.modal-content h3{margin:0 0 24px;font-size:1.3rem;font-weight:600;color:#292524}#nickname-input{width:100%;padding:14px 16px;border-radius:8px;border:1px solid #d6d3d1;background:#fafaf9;color:#292524;margin:0 0 20px;outline:none;font-size:15px;box-sizing:border-box;transition:all .2s ease}#nickname-input:focus{border-color:#78716c;background:#fff}#start-btn{width:100%;padding:14px;background:#57534e;color:#fff;border:none;border-radius:8px;font-weight:600;font-size:15px;cursor:pointer;transition:all .2s ease}#start-btn:hover{background:#44403c}.remote-cursor-widget{position:absolute;display:inline-flex;align-items:center;gap:4px;color:#1f2937;font-size:12px;font-weight:600;letter-spacing:0;padding:1px 6px;border-radius:3px;border:1px solid rgba(0,0,0,.12);white-space:nowrap;z-index:100;pointer-events:none;transform:translate(-2px,-100%);margin-top:-17px;box-shadow:0 1px 3px #0000001f;opacity:1;transition:opacity .3s ease,all .2s cubic-bezier(.4,0,.2,1);-webkit-font-smoothing:subpixel-antialiased;-moz-osx-font-smoothing:auto;text-rendering:optimizeLegibility;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Malgun Gothic,Apple SD Gothic Neo,sans-serif}.remote-cursor-widget.fading{opacity:0}.remote-cursor-widget:before{content:"";position:absolute;left:2px;top:100%;width:1.5px;height:14px;background:var(--cursor-color);box-shadow:0 0 6px var(--cursor-color);opacity:.9}button.copied:after{content:"✓";margin-left:6px;color:#16a34a;font-weight:600}