:root{color-scheme:light;--bg:#e9ecf1;--ink:#202a39;--muted:#5c6e87;--blue:#0868df;--line:#ccd7e6}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:#075bc4;text-underline-offset:3px}button,input,select,textarea{font:inherit;color:inherit}button,.button,.primary{display:inline-block;padding:12px 18px;border:1px solid #bed1ee;border-radius:12px;background:#eff5ff;color:#1859a6;font-size:15px;font-weight:650;line-height:1.4;text-decoration:none;cursor:pointer}.primary{background:var(--blue);border-color:var(--blue);color:white;box-shadow:0 3px 8px #0868df20}button:hover,.button:hover{background:#dfeaff}.primary:hover{background:#0058c4}button:disabled{opacity:.55;cursor:wait}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #83b6ff;outline-offset:3px}.site-header{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#f8faff;border-bottom:1px solid var(--line);padding:18px 32px}.brand{color:var(--ink);text-decoration:none;font-weight:750;line-height:1.4}.brand small{display:block;font-size:12px;color:var(--muted);font-weight:500}.site-header nav{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.site-header nav a:not(.primary){text-decoration:none;font-size:15px;padding:8px 12px;color:#52647c}.site-header nav .current{background:#e5efff;border-radius:10px;color:#145da7!important}.account-menu{position:relative}.account-menu summary{cursor:pointer;list-style:none;font-size:15px;font-weight:650;display:flex;align-items:center;gap:8px}.account-menu img{width:30px;height:30px;border-radius:50%}.account-menu .panel{position:absolute;right:0;top:38px;z-index:5;width:300px;box-shadow:0 12px 36px #24344b20}.account-menu p{margin:0 0 12px}.account-menu a,.account-menu button{display:block;margin-top:10px;width:100%}.badge{display:inline-block;font-size:12px;color:#216e50;background:#e1f3e9;border-radius:20px;padding:4px 9px}main{max-width:1240px;margin:auto;padding:30px 28px 50px}.hero{padding:12px 0 20px}.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:#5b7290;font-weight:700;margin:0 0 12px}h1{font-size:clamp(32px,4vw,46px);line-height:1.2;letter-spacing:-.035em;margin:0 0 14px}h2{font-size:25px;line-height:1.3;margin:0 0 20px}h3{font-size:21px;line-height:1.4;margin:0}.hero>p:last-child{color:var(--muted);margin:0}.panel,.task-unit{background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px}.filters{display:grid;grid-template-columns:1fr 1.4fr .8fr;gap:16px}.filters .search{grid-column:1/-1}.panel label,.actions label{display:block;font-size:14px;font-weight:650;color:#526782}select,input,textarea{display:block;width:100%;margin-top:6px;padding:11px 14px;border:1px solid #bdcce1;border-radius:10px;background:#fff;min-width:0}select{appearance:none;-webkit-appearance:none;min-height:47px;padding-right:32px;background-image:linear-gradient(45deg,transparent 50%,#60738f 50%),linear-gradient(135deg,#60738f 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px;background-repeat:no-repeat}.catalogue-heading,.variant-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:24px 0}.muted,.hint{color:var(--muted)}.hint{font-size:14px}.notice{background:#e8f1ff;border:1px solid #c4d8f4;border-radius:16px;padding:18px 22px;margin:0 0 24px;font-size:15px}.notice p{margin:0 0 12px}.notice a{margin-right:14px}.notice p:last-child{margin-bottom:0}#status{color:#8f421d;background:#fff5e8;border-radius:12px;padding:12px 16px}#status:empty{display:none}.task-unit{margin:20px 0;padding:26px 30px}.material{background:#f5f8fd;border:1px solid #d6e3f6;border-radius:14px;padding:20px;margin-bottom:24px}.unit-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px}.unit-heading p{margin:0}.unit-heading button{font-size:13px}.task-card+.task-card{border-top:1px solid var(--line);margin-top:28px;padding-top:28px}.task-card header{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.task-card header small{color:var(--muted);font-size:13px}.task-topic{font-size:13px;color:#5b708b;margin:8px 0 16px}.task-content{font-size:18px;line-height:1.65;overflow-wrap:break-word}.task-content p{margin:10px 0}.task-unit img{display:block;max-width:100%;height:auto;max-height:700px;object-fit:contain;margin:14px auto}.task-unit table{border-collapse:collapse;width:100%;font:inherit;font-size:16px;margin:14px 0}.task-unit td,.task-unit th{padding:7px;border:1px solid #c8d2df;vertical-align:top}.task-unit td p{margin:0}.task-unit .matching-table,.task-unit .options-table,.task-unit .matching-table td,.task-unit .options-table td{border:0}.task-unit .matching-table{table-layout:fixed}.task-unit .matching-table>tbody>tr>td:first-child,.task-unit .matching-table>tr>td:first-child{width:58%}.task-unit .matching-table>tbody>tr>td:nth-child(2),.task-unit .matching-table>tr>td:nth-child(2){width:18px}.task-unit .choice-label{width:32px;white-space:nowrap}.task-unit .matching{display:grid;grid-template-columns:1.35fr 1fr;gap:28px}.task-unit .matching p{display:flex;align-items:start;gap:10px}.task-unit .matching b{flex:0 0 28px}.task-unit .image-options{display:grid;grid-template-columns:1fr 1fr;gap:20px}.task-unit .image-options img{max-height:280px}.task-unit .answer-table{max-width:650px}.task-unit .scroll,.task-unit .history-grid-wrap{overflow-x:auto}.task-unit .geo{min-width:450px}.task-unit .flow-block>br,.task-unit .flow-block>div:empty{display:none}.task-unit .hint{color:var(--muted)}.task-unit details{margin-top:20px;padding-top:16px;border-top:1px solid #d9e2ee}.task-unit summary{cursor:pointer;color:#135ead;font-weight:650}.task-unit .solution{font-size:16px}.task-unit .solution dl{display:grid;grid-template-columns:fit-content(30%) minmax(0,1fr);gap:14px 12px;align-items:start}.task-unit .solution dl dt{margin:0;overflow-wrap:anywhere}.task-unit .solution dl dd{margin:0;min-width:0;overflow-wrap:break-word}.task-unit .key{font-weight:700}.answer-form{margin-top:20px;display:flex;gap:12px;flex-wrap:wrap}.answer-form input{flex:1;min-width:150px;margin:0}.answer-form textarea{min-height:110px}.feedback{font-size:14px;margin:8px 0;color:#466180}.feedback.correct{color:#267246}.feedback.incorrect{color:#a44827}.builder-layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(260px,.8fr);gap:22px;align-items:start}.modes{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:22px}.modes button{text-align:left;background:white;color:#314762;border-color:var(--line)}.modes small{display:block;font-size:12px;font-weight:400;margin-top:4px;color:var(--muted)}.modes .selected{background:#e9f2ff;border-color:#3b88eb;color:#075bc4}.builder-layout label{margin:14px 0}.series-row{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:center}.saved button{display:block;background:white;width:100%;text-align:left;font-size:15px;font-weight:500;margin-top:10px;overflow-wrap:anywhere}.saved small{display:block;color:var(--muted);margin-top:5px}.saved .selected{border-color:#428be8;background:#f0f6ff}#saved-count{color:#6b7c92;font-size:18px}.range{display:grid;grid-template-columns:1fr 1fr;gap:8px}.range label{margin:0}.range button{font-size:13px;padding:9px}.topic-list{border:1px solid var(--line);padding:12px;border-radius:12px;margin-top:16px}.topic-list summary{cursor:pointer;font-size:15px;font-weight:650}#topic-checks{max-height:300px;overflow:auto;margin-top:12px}#topic-checks label{display:flex;align-items:start;gap:8px;font-weight:400;margin:8px 0}#topic-checks input{width:18px;height:18px;margin:4px 0;flex-shrink:0}.count-row{display:grid;grid-template-columns:1fr 70px 85px;gap:8px;align-items:center;font-size:14px;border-bottom:1px solid #e3eaf4;padding:6px 0}.count-row input{padding:7px;margin:0}.count-row small{color:var(--muted);text-align:right}.quiet{background:transparent;border-color:var(--line);font-weight:500}.actions{display:flex;align-items:end;gap:12px;flex-wrap:wrap;padding:18px;border:1px solid var(--line);background:white;border-radius:16px}.actions label{flex:1;min-width:200px}.series-tabs,.pagination{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.series-tabs .selected,.pagination .selected{background:var(--blue);color:white}.pagination{justify-content:center}footer{margin-top:40px;border-top:1px solid var(--line);padding-top:22px;font-size:14px}footer nav{display:flex;flex-wrap:wrap;gap:10px 24px}[hidden]{display:none!important}.guest .task-content{user-select:none;-webkit-user-select:none}
@media(max-width:950px){.site-header{flex-wrap:wrap;padding:16px 22px}.site-header nav{order:3;width:100%}.builder-layout{grid-template-columns:1fr}.saved{order:2}.filters{grid-template-columns:1fr 1fr}.filters label:nth-child(2){grid-column:1/-1;grid-row:2}}@media(max-width:600px){body{font-size:16px}main{padding:24px 14px}.site-header{padding:14px}.site-header nav{gap:4px}.site-header nav a:not(.primary){padding:8px 6px;font-size:13px}.site-header nav .primary{padding:10px;font-size:13px}.brand{font-size:15px}.account-menu summary{font-size:13px}.panel,.task-unit{padding:18px}.task-content{font-size:17px}.task-unit table{font-size:14px}.task-unit .matching{gap:14px;grid-template-columns:1.2fr 1fr}.task-unit .matching p{gap:5px}.task-unit .matching b{flex-basis:23px}.material{padding:12px}.catalogue-heading,.variant-heading{align-items:start;flex-direction:column}.series-row{grid-template-columns:1fr}.series-row label{margin-bottom:0}.series-row p{margin:0}.actions>a{flex:1;text-align:center}.task-unit .image-options{gap:10px}.task-unit .options-table td{padding:5px 2px}.task-unit .options-table .choice-label{width:25px}.account-menu .panel{width:280px}.unit-heading{align-items:start}.unit-heading button{white-space:nowrap}}
@media print{body>header,main{display:none!important}body:before{content:'Для печати используйте кнопку «Распечатать»: она открывает готовый PDF с двумя страницами на горизонтальном листе.';display:block;font:16px/1.5 sans-serif;padding:30px}}

.task-unit .image-options figure{margin:0;min-width:0}

.task-unit img.inline-symbol{display:inline-block;vertical-align:middle;margin:0 3px;max-height:24px;width:auto}

/* Catalogue entry to the existing variant constructor. */
.variant-entry{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:20px;padding:18px 22px;border:1px solid #c1d6f7;border-radius:16px;background:#eef5ff}
.variant-entry>div{min-width:0}
.variant-entry h2{font-size:20px;line-height:1.35;margin:0;font-weight:750;letter-spacing:-.015em}
.variant-entry p{font-size:14px;line-height:1.5;color:var(--muted);margin:5px 0 0}
.variant-entry>.primary{flex-shrink:0;white-space:nowrap;text-align:center}
@media(max-width:600px){.variant-entry{align-items:stretch;flex-direction:column;gap:14px;padding:18px}.variant-entry h2{font-size:18px}.variant-entry>.primary{width:100%}}

.repeat-badge{display:inline-block;margin-left:12px;padding:4px 9px;border-radius:8px;background:#fff1d6;color:#805718;font-size:14px;font-weight:600;vertical-align:middle}