:root{--ink:#18231f;--paper:#f2efe6;--panel:#fbfaf5;--red:#dd5b46;--green:#397d67;--blue:#376e9b;--line:#cfcabd}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:ui-serif,"Songti SC","Noto Serif CJK SC",serif;min-height:100vh}button,textarea,select{font:inherit}button{cursor:pointer}header{height:78px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #bcb7aa;background:#ebe6d9}.brand{display:flex;align-items:center;gap:12px}.mark{display:grid;place-items:center;width:42px;height:42px;background:var(--ink);color:#fff;border-radius:50%;font-weight:800}.brand h1{font-size:20px;margin:0}.brand p{margin:3px 0 0;font:12px ui-sans-serif,system-ui;color:#6b6f68}.top-actions{display:flex;gap:8px}button{border:1px solid var(--ink);background:transparent;border-radius:3px;padding:9px 14px}.primary,.add{background:var(--ink);color:#fff}.quiet{border-color:#aaa79d}main{display:grid;grid-template-columns:310px 1fr;height:calc(100vh - 78px)}aside{padding:28px 24px;border-right:1px solid #bcb7aa;overflow:auto;background:var(--panel)}h2{font-size:26px;line-height:1.25;margin:8px 0}.intro p,.guide li{font:14px/1.7 ui-sans-serif,system-ui;color:#5d615b}.eyebrow{font:700 11px ui-monospace,monospace;letter-spacing:.08em;color:var(--red)}form{margin:24px 0;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}label{font:700 13px ui-sans-serif,system-ui;display:block;margin-bottom:15px;position:relative}select,textarea{width:100%;margin-top:7px;border:1px solid #aaa79d;background:#fffef9;border-radius:2px;padding:10px;color:var(--ink)}textarea{height:100px;resize:vertical;line-height:1.5}.counter{position:absolute;right:8px;bottom:8px;font-size:10px;color:#999}.add{width:100%;border:0;padding:12px}.guide ol{padding-left:20px}.legend{display:flex;gap:13px;flex-wrap:wrap;font:12px ui-sans-serif,system-ui}.legend span{display:flex;align-items:center;gap:5px}.legend i{width:9px;height:9px;border-radius:50%}.legend .claim{background:var(--red)}.legend .evidence{background:var(--green)}.legend .question{background:var(--blue)}.workspace{min-width:0;padding:18px 22px 22px;display:flex;flex-direction:column}.board-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-family:ui-sans-serif,system-ui}.board-head strong{margin-right:12px}.board-head span{font-size:12px;color:#74766f}.relation-toggle{display:flex;align-items:center}.relation-toggle button{font-size:12px;border-color:#c1bdb3;padding:6px 10px}.relation-toggle button+button{margin-left:-1px}.relation-toggle button.active{background:var(--ink);color:#fff}#board{position:relative;flex:1;min-height:480px;overflow:hidden;border:1px solid #aaa79d;background-color:#f7f4eb;background-image:radial-gradient(#c8c3b7 1px,transparent 1px);background-size:22px 22px}#edges,#nodes{position:absolute;inset:0;width:100%;height:100%}#edges{overflow:visible;pointer-events:none}.edge{pointer-events:stroke;cursor:pointer}.edge-label{pointer-events:none;font:700 11px ui-sans-serif,system-ui}.node{position:absolute;width:210px;min-height:112px;background:#fffdf7;border:1px solid var(--ink);box-shadow:5px 5px 0 rgba(24,35,31,.14);padding:13px 14px 10px;touch-action:none;user-select:none}.node.claim{border-top:5px solid var(--red)}.node.evidence{border-top:5px solid var(--green);border-radius:13px 2px 13px 2px}.node.question{border-top:5px solid var(--blue);clip-path:polygon(0 0,94% 0,100% 12%,100% 100%,0 100%)}.node .kind{font:700 10px ui-monospace,monospace;letter-spacing:.08em;color:#6c706b}.node p{font:15px/1.45 ui-sans-serif,system-ui;margin:9px 0 12px;overflow-wrap:anywhere;white-space:pre-wrap}.node-actions{display:flex;justify-content:flex-end;gap:5px}.node-actions button{border:0;padding:4px 6px;font:11px ui-sans-serif,system-ui;color:#626660}.node-actions .link{color:var(--blue)}.node.source{outline:3px solid #f0a844;outline-offset:3px}.node.target-ready:hover{outline:3px solid var(--green)}#empty{position:absolute;left:50%;top:48%;transform:translate(-50%,-50%);text-align:center;color:#77796f;font-family:ui-sans-serif,system-ui;pointer-events:none}#empty h3{color:var(--ink);margin:8px}#empty p{font-size:13px}.empty-sketch{font-size:46px}.empty-sketch span{font-size:18px;color:var(--red)}#connectHint{display:none;position:absolute;left:50%;bottom:18px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:9px 14px;border-radius:2px;font:12px ui-sans-serif,system-ui}#toast{position:fixed;right:20px;bottom:20px;opacity:0;transform:translateY(8px);transition:.2s;background:var(--ink);color:white;padding:10px 14px;font:13px ui-sans-serif,system-ui;pointer-events:none}#toast.show{opacity:1;transform:none}@media(max-width:760px){header{height:auto;padding:12px 15px}.brand p{display:none}.top-actions button{padding:7px 9px;font-size:12px}main{grid-template-columns:1fr;height:auto}aside{border-right:0;border-bottom:1px solid #bcb7aa;padding:20px}.intro p,.guide{display:none}form{margin:13px 0}.workspace{height:68vh;padding:12px}.board-head{align-items:flex-start}.board-head>div:first-child span{display:block;margin-top:4px}.relation-toggle>span{display:none}#board{min-height:430px}.node{width:175px}}