:root{color-scheme:light;--paper:#f6f5f0;--ink:#233b34;--muted:#788079;--green:#2b5947;--line:#dddfd5;--white:#fffefa;--soft:#eaf0e6;--error:#a23c31;font-family:Arial,Helvetica,sans-serif;font-synthesis:none}
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3px}.brand-sub{font-size:13px;font-weight:400;letter-spacing:0;color:var(--muted)}.header-link{font-size:12px;text-decoration:none;color:#58665b}.header-link span{margin-left:12px;font-size:17px}main{max-width:1144px;padding:0 38px;margin:auto}.intro{padding:51px 0 36px}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:#627265;margin:0}.intro .eyebrow{display:flex;align-items:center;gap:9px}.green-dot{width:6px;height:6px;border-radius:50%;background:#719374}h1{font-family:Georgia,'Times New Roman',serif;font-size:50px;line-height:1.08;letter-spacing:-1.8px;font-weight:400;margin:18px 0 14px}.intro-description{color:#727b72;font-size:14px;line-height:1.6;margin:0}.workspace{display:grid;grid-template-columns:370px minmax(0,1fr);gap:48px;align-items:start}.input-panel{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:24px;box-shadow:0 3px 12px 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solid #d9ded3;background:#fafaf6;line-height:1.9;font-size:11px;color:#3e5747;font-family:Consolas,'Courier New',monospace;outline:none;white-space:pre}textarea::placeholder{color:#afb6a8}textarea:focus,input:focus,select:focus{border-color:#6f967b;outline:2px solid #6f967b22}.input-meta{display:flex;justify-content:space-between;align-items:center;margin-top:10px;font-size:10px;color:#8a9284;gap:5px}.input-meta .valid{color:var(--green)}.format-help{font-size:10px;margin-top:15px}.solve-settings{border-top:1px solid #e8e9e1;margin-top:23px;padding:18px 0;display:flex;align-items:center;justify-content:space-between}.solve-settings label{font-weight:400;color:#747f72;font-size:11px}select{border:1px solid #e0e3d8;border-radius:5px;background:var(--white);color:#455b49;padding:7px 9px;font-size:11px}.solve-button{display:flex;align-items:center;justify-content:space-between;background:var(--green);color:#fff;border:0;border-radius:7px;padding:14px 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