:root{--bg-main: #f8f9fa;--accent-primary: #3b82f6;--surface-card: #ffffff;--border-solid: #000000;--shadow-hard: #000000;--text-primary: #000000;--state-success: #d1fae5}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at top right,#eef4ff 0%,var(--bg-main) 40%);color:var(--text-primary);font-family:Inter,Noto Sans JP,sans-serif;font-weight:700}button,input{font-family:inherit}.neo-retro-box{background:var(--surface-card);border:2px solid var(--border-solid);box-shadow:4px 4px 0 var(--shadow-hard)}.neo-retro-header{margin:0;font-weight:900;text-transform:uppercase;letter-spacing:.05em;font-size:clamp(18px,2vw,24px)}.neo-retro-button{border:2px solid var(--border-solid);box-shadow:4px 4px 0 var(--shadow-hard);background:var(--surface-card);color:var(--text-primary);font-size:14px;font-weight:800;letter-spacing:.04em;padding:9px 10px;cursor:pointer;transition:transform .1s ease,box-shadow .1s ease}.neo-retro-button:active{box-shadow:1px 1px 0 var(--shadow-hard);transform:translate(3px,3px)}.neo-retro-button:disabled{opacity:.5;cursor:not-allowed}.neo-retro-input{width:100%;margin-top:6px;border:2px solid var(--border-solid);padding:8px;font-size:14px;font-weight:700;background:#fff}.landing{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:24px}.landing-card{width:min(720px,100%);padding:24px;display:grid;gap:20px}.landing-meta{margin:0;font-size:12px;font-weight:500}.form-block{border:2px dashed #000;padding:16px;display:grid;gap:10px}.form-block h2{margin:0;font-size:16px}.form-block label{font-size:12px;font-weight:700}.session-url{margin:0;padding:8px;border:2px solid #000;background:#f3f4f6;font-size:12px;font-weight:600;word-break:break-all}.session-actions{display:flex;flex-wrap:wrap;gap:8px}.session-empty{margin:0;font-size:12px;font-weight:600}.loading-screen{min-height:100vh;display:grid;place-items:center}.loading-screen>div{padding:16px}.load-error-box{max-width:560px;display:grid;gap:12px}.load-error-box h2{margin:0;font-size:20px}.load-error-box p{margin:0;font-size:13px;white-space:pre-wrap;word-break:break-word}.load-error-actions{display:flex;flex-wrap:wrap;gap:8px}.app-shell{min-height:100vh;padding:14px;gap:14px;display:grid}.screen-pc{grid-template-columns:320px minmax(0,1fr)}.screen-tablet{grid-template-columns:300px minmax(0,1fr)}.screen-mobile{grid-template-columns:minmax(0,1fr);padding-bottom:78px}.left-panel{padding:16px;height:calc(100vh - 28px);position:sticky;top:14px;overflow:auto}.tools-list{display:grid;gap:8px}.default-icon-catalog{display:grid;gap:8px;padding:10px}.default-icon-catalog h3{margin:0;font-size:13px;letter-spacing:.03em}.default-icon-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.default-color-controls{display:grid;gap:6px}.default-color-title{margin:0;font-size:11px}.default-color-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.color-chip{display:flex;align-items:center;justify-content:center;gap:6px;padding:7px 8px;font-size:11px}.color-chip.active{background:var(--state-success)}.color-dot{width:12px;height:12px;border-radius:999px;border:2px solid #000}.default-add-button{width:100%}.default-icon-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.tool-button.active{background:var(--state-success)}.preset-catalog{display:grid;gap:8px;padding:10px}.preset-catalog h3{margin:0;font-size:13px;letter-spacing:.03em}.preset-catalog label{font-size:11px}.preset-input{margin-top:4px}.preset-count{margin:0;font-size:11px}.preset-select{min-height:136px}.properties-panel-left{display:grid;gap:8px;padding:10px}.properties-panel-left h3{margin:0;font-size:13px;letter-spacing:.03em}.properties-panel-left label{font-size:11px}.board-panel{min-width:0;display:grid;grid-template-rows:minmax(0,1fr);padding:8px;gap:8px;height:calc(100vh - 28px)}.board-scroll-area{border:2px dashed #000;overflow:auto;background:#f3f4f6;padding:8px;touch-action:none;height:100%}.board-canvas-shell{position:relative}.board-canvas-zoom{transform-origin:top left}.selection-box{margin-top:10px;padding:10px;font-size:12px}.selection-box h3{margin:0 0 6px;font-size:14px}.selection-box p{margin:4px 0}.mobile-action-bar{position:fixed;left:10px;right:10px;bottom:10px;padding:6px;z-index:30;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.mobile-icon-button{padding:8px 6px;font-size:11px}.mobile-icon-button.active{background:var(--state-success)}.mobile-detail-sheet{position:fixed;left:10px;right:10px;bottom:66px;z-index:29;max-height:min(62vh,520px);padding:8px;display:grid;gap:8px}.mobile-detail-header{display:flex;align-items:center;justify-content:space-between;gap:8px}.mobile-detail-content{overflow:auto;max-height:calc(min(62vh,520px) - 52px)}.hidden-input{display:none}.toast-stack{position:fixed;right:12px;top:12px;display:grid;gap:8px;z-index:200}.toast{min-width:220px;padding:10px 12px;font-size:12px;background:#fef3c7}@media(max-width:767px){.default-icon-grid,.default-color-grid,.default-icon-actions{grid-template-columns:minmax(0,1fr)}.board-panel{height:calc(100vh - 96px)}}.screen-tablet .default-icon-grid,.screen-tablet .default-color-grid,.screen-tablet .default-icon-actions{grid-template-columns:minmax(0,1fr)}