:root{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#25262d;background:#f5f5f7;font-synthesis:none;--surface:#fff;--bg:#f5f5f7;--text:#25262d;--muted:#7e808b;--border:#e7e7ec;--red:#e8404b;--soft:#fef0f1}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{border:1px solid var(--border);border-radius:9px;padding:11px 14px;background:var(--surface);color:var(--text);font-size:13px;font-weight:600;cursor:pointer;transition:background .15s,transform .15s;min-height:42px}button:hover{background:var(--bg)}button:active{transform:translateY(1px)}button:disabled{opacity:.45;cursor:not-allowed}a{color:var(--red);text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #ef8990;outline-offset:2px}header{height:82px;border-bottom:1px solid var(--border);background:var(--surface);display:flex;align-items:center;justify-content:space-between;padding:0 4vw}.brand{display:flex;gap:12px;align-items:center;color:var(--text);font-size:20px;letter-spacing:-.7px}.brand strong span{font-weight:400}.brand-mark{background:var(--red);width:34px;height:36px;display:grid;place-items:center;color:#fff;border-radius:10px;font-size:30px;font-weight:800;font-style:italic}.header-right{display:flex;align-items:center;gap:16px}.chip{font-size:12px;color:var(--muted);background:var(--bg);padding:8px 12px;border-radius:20px}.icon{font-size:22px;border:0;padding:4px 10px}main{max-width:1600px;margin:auto;padding:38px 4vw 20px}.intro{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:24px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:var(--red)}h1{font-size:clamp(24px,2.4vw,36px);font-weight:650;letter-spacing:-1.2px;margin:12px 0}p{line-height:1.6;font-size:13px}.intro p{color:var(--muted);margin:0}.live-status{background:var(--surface);border:1px solid var(--border);border-radius:22px;padding:10px 15px;font-size:12px;display:flex;align-items:center;gap:9px;max-width:340px}.live-status i,.device-status i{width:7px;height:7px;border-radius:50%;background:#aaa;flex-shrink:0}.live-status i.pulse{background:#42ad78;box-shadow:0 0 0 4px #42ad7819;animation:pulse 2s infinite}@keyframes pulse{50%{box-shadow:0 0 0 6px #42ad7808}}.notice{background:var(--surface);border:1px solid var(--border);padding:13px 16px;border-radius:10px;font-size:12px;color:var(--muted);line-height:1.6;margin-bottom:24px}.notice a{white-space:nowrap}.error{border-color:#efb0b5;color:var(--text);display:flex;justify-content:space-between;align-items:center}.error button{border:0;min-height:28px;padding:2px 8px}.workspace{display:grid;grid-template-columns:280px minmax(0,1fr);gap:24px}aside{display:flex;flex-direction:column;gap:18px}.card{background:var(--surface);border:1px solid var(--border);padding:22px;border-radius:14px}.section-label{font-size:9px;letter-spacing:1.8px;font-weight:700;color:var(--muted)}h2{font-size:17px;letter-spacing:-.3px;margin:14px 0 5px}.muted{color:var(--muted)}.small{font-size:11px}.wide{width:100%;margin-top:9px}.primary{background:var(--red);color:#fff;border-color:var(--red)}.primary:hover{background:#d5303c}.danger{color:var(--red);background:var(--soft);border-color:transparent;font-size:11px}.pen-illustration{height:64px;display:grid;place-items:center;overflow:hidden;margin-top:12px}.pen-body{height:13px;width:180px;border-radius:3px 16px 16px 3px;background:linear-gradient(#fc5662,#d32537);transform:rotate(-12deg);position:relative;box-shadow:0 12px 10px #e8404b16}.pen-body:before{content:"";position:absolute;left:-21px;top:0;border-right:22px solid #aaa;border-top:6px solid transparent;border-bottom:7px solid transparent}.pen-body:after{content:"";position:absolute;right:40px;top:0;height:13px;border-left:2px solid #ac1627}.device-status{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:11px;margin:20px 0 10px}.card input:not([type=checkbox]){width:100%;background:var(--bg);color:var(--text);border:1px solid var(--border);padding:10px;border-radius:8px;font-size:11px;margin-top:8px}.card label.small{display:block;margin-top:19px}.text-link{display:block;text-align:center;font-size:11px;margin:13px}.toggle{display:flex;gap:8px;align-items:center;font-size:12px}input[type=checkbox]{accent-color:var(--red);width:16px;height:16px;vertical-align:middle}.test-card{padding:17px 20px}.test-card p{margin-bottom:0}.canvas-section{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:var(--surface);display:flex;flex-direction:column;min-width:0}.canvas-toolbar{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;gap:12px;border-bottom:1px solid 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minmax(0,1fr);gap:16px}.card{padding:17px}.canvas-toolbar,.page-bar{flex-wrap:wrap}.paper-wrap{min-height:620px;margin:12px}.intro{align-items:flex-start}.live-status{font-size:10px}}@media(max-width:650px){header{height:65px;padding:0 18px}.brand{font-size:16px}.brand-mark{width:28px;height:30px;font-size:25px}.chip{display:none}main{padding:24px 14px}.intro{flex-direction:column;gap:16px}.intro h1{font-size:27px}.workspace{display:flex;flex-direction:column}aside{display:grid;grid-template-columns:1fr;gap:12px}.card{padding:20px}.pen-illustration{height:34px;float:right;width:130px;opacity:.8}.pen-body{width:100px}.card h2{margin-top:17px}button,.card .wide{min-height:46px}.notice{font-size:11px;margin-bottom:16px}.paper-wrap{min-height:65dvh;margin:10px}.canvas-toolbar{padding:12px}.page-bar{padding:10px}.canvas-footer{padding:12px;font-size:9px}.viewer .paper-wrap{min-height:calc(100dvh - 300px)}.bottom-note span{display:none}select{max-width:220px}.diagnostics{overflow-wrap:anywhere}}