:root{--bg: #f3f4f6;--panel: #ffffff;--border: #e3e3e6;--text: #1c1c1c;--muted: #6b7280;--accent: #2a9d8f;font-family:system-ui,-apple-system,Hiragino Sans,Noto Sans JP,sans-serif;color:var(--text)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg)}.app{display:flex;flex-direction:column;height:100%}.app-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border);flex-wrap:wrap}.brand{display:flex;align-items:center;gap:10px}.brand .logo{font-size:28px}.brand h1{font-size:18px;margin:0}.brand .room{margin:2px 0 0;font-size:12px;color:var(--muted)}.brand code{background:#eef2f1;padding:1px 6px;border-radius:5px}.header-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.me{display:flex;align-items:center;gap:6px}.name-input{width:120px;border:1px solid var(--border);border-radius:8px;padding:5px 8px;font-size:14px}.dot{display:inline-block;width:12px;height:12px;border-radius:50%;flex:none}.presence{display:flex;align-items:center;gap:8px}.presence-count{font-size:13px;color:var(--muted);white-space:nowrap}.presence-list{display:flex;gap:10px;list-style:none;margin:0;padding:0;flex-wrap:wrap}.presence-list li{display:flex;align-items:center;gap:5px;font-size:13px}.toolbar{display:flex;align-items:center;gap:16px;padding:8px 16px;background:var(--panel);border-bottom:1px solid var(--border);flex-wrap:wrap}.segmented{display:inline-flex;border:1px solid var(--border);border-radius:10px;overflow:hidden}.segmented button{border:none;background:#fff;padding:7px 12px;font-size:14px;cursor:pointer;display:inline-flex;align-items:center;gap:5px}.segmented button+button{border-left:1px solid var(--border)}.segmented button.active{background:var(--accent);color:#fff}.tool-icon{font-size:15px}.palette{display:inline-flex;gap:5px;align-items:center}.swatch{width:24px;height:24px;border-radius:6px;border:2px solid #fff;box-shadow:0 0 0 1px var(--border);cursor:pointer;padding:0;position:relative}.swatch.active{box-shadow:0 0 0 2px var(--accent)}.swatch.custom{display:inline-flex;align-items:center;justify-content:center;overflow:hidden;background:conic-gradient(red,#ff0,#0f0,#0ff,#00f,#f0f,red)}.swatch.custom input{opacity:0;width:100%;height:100%;cursor:pointer}.widths{display:inline-flex;gap:4px}.width{width:32px;height:32px;border:1px solid var(--border);border-radius:8px;background:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.width.active{border-color:var(--accent);background:#eef7f5}.width-dot{background:var(--text);border-radius:50%;display:inline-block}.actions{display:inline-flex;gap:8px;margin-left:auto}.btn{border:1px solid var(--border);background:#fff;border-radius:8px;padding:7px 12px;font-size:14px;cursor:pointer}.btn:hover{background:#f7f7f8}.btn.ghost{color:#b4232f;border-color:#f0c7ca}.btn.invite{background:var(--accent);color:#fff;border-color:var(--accent)}.app-main{flex:1;min-height:0;padding:16px;display:flex}.board-wrap{flex:1;display:flex;align-items:center;justify-content:center;min-height:0}.board{position:relative;aspect-ratio:1 / 1;max-width:min(100%,calc(100vh - 180px));max-height:100%;width:100%;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 6px 24px #0000000f;overflow:hidden;touch-action:none}.board-svg{position:absolute;inset:0;width:100%;height:100%;display:block}.board.cursor-pen{cursor:crosshair}.board.cursor-eraser{cursor:cell}.board.cursor-note{cursor:copy}.note-layer{position:absolute;inset:0;pointer-events:none}.note{position:absolute;pointer-events:auto;border-radius:8px;box-shadow:0 3px 10px #0000002e;display:flex;flex-direction:column;min-height:88px}.note-bar{display:flex;justify-content:flex-end;gap:2px;padding:2px 4px;cursor:move;border-radius:8px 8px 0 0;background:#0000000f}.note-btn{border:none;background:transparent;cursor:pointer;font-size:13px;line-height:1;padding:2px 4px;color:#444}.note-btn:hover{color:#000}.note-colors{display:flex;gap:4px;padding:4px}.note-color{width:18px;height:18px;border-radius:50%;border:1px solid rgba(0,0,0,.2);cursor:pointer;padding:0;position:relative}.note-color.active{box-shadow:0 0 0 2px var(--accent)}.note-color.custom{display:inline-flex;align-items:center;justify-content:center;overflow:hidden;background:conic-gradient(red,#ff0,#0f0,#0ff,#00f,#f0f,red)}.note-color.custom input{opacity:0;width:100%;height:100%;cursor:pointer;border:none}.note-text{flex:1;border:none;background:transparent;resize:none;padding:6px 8px;font-size:13px;font-family:inherit;color:#222;outline:none;min-height:56px}