:root{--ink:#142f2a;--muted:#53665f;--green:#146044;--lime:#d4ef9c;--paper:#f7f8f2;--line:#dce3d8;--red:#b63227;--blue:#156fbc;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}a{color:var(--green);text-underline-offset:4px}button,input,select,textarea{font:inherit}button,.button{cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--green);border-radius:7px;padding:12px 18px;background:var(--green);color:white;text-decoration:none;font-weight:700;font-size:14px;line-height:1.2}button:hover,.button:hover{filter:brightness(.93)}button:disabled{opacity:.45;cursor:not-allowed}.button.secondary,button.secondary{background:white;color:var(--green);border-color:var(--line)}button.danger{background:#fff;color:var(--red);border-color:#dfb9b4}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #307dc4;outline-offset:3px}header.site-header{height:88px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 max(24px,calc((100vw - 1240px)/2));background:white}.brand{font-weight:800;font-size:19px;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:10px;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:34px;height:34px;background:var(--green);color:white;border-radius:5px;font-size:26px}.site-header nav{display:flex;align-items:center;gap:25px}.site-header nav a{text-decoration:none;color:var(--ink);font-size:14px}.site-header nav .button{color:white}.wrap{max-width:1240px;margin:auto;padding:0 28px}.eyebrow{font-size:12px;letter-spacing:1.8px;text-transform:uppercase;font-weight:800;color:var(--green);display:flex;align-items:center;gap:9px}.eyebrow:before{content:'';width:8px;height:8px;border-radius:50%;background:var(--green)}.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:center;padding-top:74px;padding-bottom:80px}h1{font-size:clamp(38px,4.9vw,64px);line-height:1.04;letter-spacing:-2.8px;margin:24px 0}h1 em{font-style:normal;color:var(--green)}.lede{font-size:19px;line-height:1.7;max-width:620px;color:var(--muted)}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0}.small{font-size:13px;color:var(--muted);line-height:1.6}.hero-art{background:#e1e9dd;border-radius:18px;padding:28px 44px 24px;position:relative}.hero-art img{width:100%;height:auto;display:block;box-shadow:0 14px 30px #243e2720;transform:rotate(2deg)}.hero-art .small{text-align:center;margin:19px 0 0}.feature-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding:25px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px}.feature-strip span{font-weight:700}.feature-strip span:before{content:'✓';margin-right:10px;color:var(--green)}.section{padding:64px 0}h2{font-size:32px;letter-spacing:-.8px;line-height:1.2;margin:15px 0 20px}h3{font-size:20px;line-height:1.35}.section-intro{max-width:680px;color:var(--muted);line-height:1.75}.split{display:grid;grid-template-columns:1fr 1fr;gap:24px}.card{background:white;padding:32px;border:1px solid var(--line);border-radius:12px}.card p{line-height:1.75;color:var(--muted)}.card .number{font-size:12px;font-weight:700;letter-spacing:2px;color:var(--green)}.dark{background:var(--ink);color:white}.dark p,.dark .eyebrow{color:#d2ddd2}.dark .button{background:var(--lime);border-color:var(--lime);color:var(--ink)}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.guide-grid .card{padding:24px}.guide-grid h3 a{color:var(--ink);text-decoration:none}.guide-grid h3 a:hover{text-decoration:underline}.guide-grid .small{font-size:12px}.site-footer{border-top:1px solid var(--line);padding:38px 0 22px;background:white}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}.footer-grid a{display:block;margin:12px 0;font-size:14px}.footer-bottom{border-top:1px solid var(--line);margin-top:25px;padding-top:18px;font-size:12px;color:var(--muted)}.breadcrumb{font-size:13px;padding-top:28px;color:var(--muted)}.article-head{padding:25px 0 35px;max-width:850px}.article-head h1{font-size:48px}.article-layout{display:grid;grid-template-columns:minmax(0,780px) 280px;gap:70px;padding-bottom:70px}.article-body{font-size:17px;line-height:1.85}.article-body h2{font-size:27px;margin-top:40px}.article-body h3{margin-top:26px}.article-body li{margin:10px 0}.article-body p{color:#354e45}.article-body .notice{font-size:14px}.notice{background:#edf2e7;border-left:3px solid var(--green);padding:16px 20px;line-height:1.65;color:#354e45}.article-aside{align-self:start;position:sticky;top:24px}.article-aside a{display:block;margin:14px 0;font-size:14px}.article-aside h3{margin-top:0}.sources{font-size:14px;overflow-wrap:anywhere}.sources li{margin:8px 0}.skip{position:absolute;top:-80px;padding:12px;background:white;z-index:30}.skip:focus{top:0}.faq details{padding:18px 0;border-bottom:1px solid var(--line)}.faq summary{font-weight:700;cursor:pointer}.faq p{line-height:1.8;color:var(--muted)}label{display:block;font-size:13px;font-weight:700;margin:12px 0 6px}input,textarea,select{width:100%;padding:10px;border:1px solid #becbc2;border-radius:5px;background:white;color:var(--ink)}textarea{resize:vertical;line-height:1.5}.planner-top{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px 28px;background:white;border-bottom:1px solid var(--line)}.planner-top h1{font-size:26px;letter-spacing:-.6px;margin:0 0 5px}.planner-top .small{margin:0}.planner-actions{display:flex;gap:8px;flex-wrap:wrap}.planner-actions button{padding:10px 13px}.editor{display:grid;grid-template-columns:290px minmax(340px,1fr) 250px;min-height:760px}.sidebar{background:white;padding:20px;border-right:1px solid var(--line);overflow:auto;max-height:calc(100vh - 100px)}.sidebar.right{border-right:0;border-left:1px solid var(--line)}.sidebar h2{font-size:16px;letter-spacing:0;margin:0 0 12px}.sidebar details{border-bottom:1px solid var(--line);padding:14px 0}.sidebar details:first-child{padding-top:0}.sidebar summary{font-size:14px;font-weight:700;cursor:pointer}.sidebar .small{font-size:12px}.sidebar button{font-size:12px;padding:10px;width:100%}.symbol-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:12px}.symbol-grid button{flex-direction:column;padding:9px 3px;background:white;color:var(--ink);border-color:var(--line);font-weight:400;font-size:11px;min-height:74px}.symbol-grid svg{width:29px;height:29px}.symbol-grid button.active,.tool-row button.active{border-color:var(--green);background:#e8f1df;box-shadow:inset 0 0 0 1px var(--green)}.tool-row{display:flex;gap:6px;margin:10px 0}.tool-row button{background:white;color:var(--ink);border-color:var(--line);padding:10px 6px}.canvas-area{padding:20px 24px 30px;background:#e8ece5;overflow:auto;min-width:0}.canvas-top{display:flex;justify-content:space-between;gap:14px;align-items:center;max-width:760px;margin:0 auto 12px}.canvas-top button{padding:7px 10px;font-size:12px}.canvas-top .small{margin:0}.sheet-holder{width:100%;max-width:620px;margin:auto;background:white;box-shadow:0 6px 24px #263c2520;line-height:0}.sheet-holder svg{width:100%;height:auto;touch-action:none;user-select:none;display:block}.sheet-holder svg [data-id]{cursor:move}.status{font-size:12px;line-height:1.5;margin:12px auto 0;max-width:620px;min-height:36px;color:#32483d}.help-note{font-size:12px;line-height:1.55;padding:12px;background:#f4f6f0;border-radius:6px}.inline-check{display:flex;align-items:flex-start;gap:9px;line-height:1.45;font-weight:400}.inline-check input{width:auto;flex-shrink:0;margin-top:3px}.two{display:grid;grid-template-columns:1fr 1fr;gap:8px}.right hr{border:0;border-top:1px solid var(--line);margin:18px 0}dialog{border:1px solid var(--line);border-radius:12px;padding:26px;max-width:520px;width:calc(100% - 32px);max-height:90vh;overflow:auto;color:var(--ink)}dialog::backdrop{background:#0d281d80}dialog h2{font-size:24px;margin-top:0}dialog .actions{margin-bottom:0}dialog button{font-size:13px}.error{color:#a22a20}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.upload-label{padding:16px;text-align:center;border:1px dashed #8fae96;border-radius:6px;background:#f7faf2;cursor:pointer;font-weight:600}.upload-label input{font-weight:400;font-size:11px;margin-top:10px;border:none;padding:0;background:transparent}.page-links{display:flex;gap:12px;flex-wrap:wrap}.site-header .mobile-label{display:none}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px}td,th{padding:12px;text-align:left;border:1px solid var(--line)}th{background:#edf2e7}@media(min-width:1600px){.editor{grid-template-columns:310px minmax(340px,1fr) 290px}.sheet-holder{max-width:680px}}@media(max-width:1100px){.editor{grid-template-columns:260px minmax(300px,1fr)}.sidebar.right{grid-column:1/-1;max-height:none;display:grid;grid-template-columns:1fr 1fr;gap:24px;border-top:1px solid var(--line)}.hero{gap:30px}.hero-art{padding:20px}.article-layout{gap:30px;grid-template-columns:minmax(0,1fr) 240px}.site-header nav{gap:16px}}@media(max-width:760px){header.site-header{height:auto;min-height:78px;flex-wrap:wrap;padding:20px;gap:15px}.site-header nav{flex-wrap:wrap;gap:16px}.site-header nav a{font-size:13px}.site-header nav .button{padding:8px 12px}.wrap{padding:0 20px}.hero{grid-template-columns:1fr;padding-top:35px;padding-bottom:40px;gap:25px}h1{font-size:44px;letter-spacing:-1.8px}.hero-art{max-width:420px;width:100%;margin:auto;padding:25px 40px}.hero .lede{font-size:17px}.feature-strip{grid-template-columns:1fr;gap:14px}.section{padding:40px 0}.split,.guide-grid,.footer-grid{grid-template-columns:1fr}.article-layout{grid-template-columns:1fr}.article-aside{position:static;order:-1}.article-aside .toc{display:none}.article-head h1{font-size:36px}.article-body{font-size:16px}.editor{display:flex;flex-direction:column}.sidebar{max-height:none;border-right:0}.sidebar.left{display:grid;grid-template-columns:1fr 1fr;gap:16px}.sidebar.left details{padding:0 0 12px}.sidebar.left .symbol-details{grid-column:1/-1}.symbol-grid{grid-template-columns:repeat(5,1fr)}.canvas-area{padding:18px 12px}.sidebar.right{display:grid;grid-template-columns:1fr 1fr}.planner-top{align-items:flex-start;flex-direction:column;padding:22px 20px}.planner-actions{gap:6px}.planner-actions button{font-size:12px;padding:9px}.sheet-holder{max-width:600px}.canvas-top{align-items:flex-start}.canvas-top .small{font-size:11px}.article-aside{display:none}}@media(max-width:430px){.sidebar.left,.sidebar.right{grid-template-columns:1fr}.symbol-grid{grid-template-columns:repeat(4,1fr)}.site-header nav{gap:12px}.brand{font-size:18px}.hero-art{padding:20px}.canvas-top{flex-wrap:wrap}}@media print{.site-header,.site-footer,.sidebar,.planner-top,.canvas-top,.status,.skip{display:none!important}.editor,.canvas-area{display:block;padding:0;background:white}.sheet-holder{width:100%;max-width:none;box-shadow:none}body{background:white}@page{size:A4 portrait;margin:0}}