.r4and{--r4a-blue:#164f8f;--r4a-blue-2:#0f3f77;--r4a-ink:#17365c;--r4a-muted:#6d7f96;--r4a-line:#dfe7f1;--r4a-soft:#f4f8fd;--r4a-ok:#16784b;--r4a-bad:#a23b32;font-family:inherit;color:var(--r4a-ink);max-width:920px;margin:18px auto;padding:0 12px;box-sizing:border-box}
.r4and *{box-sizing:border-box}
.r4and button,.r4and input{font:inherit}
.r4and-shell{display:flex;flex-direction:column;gap:14px}
.r4and-hero{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#edf5ff,#f9fbff);border:1px solid var(--r4a-line);border-radius:24px;padding:18px 20px}
.r4and-hero-icon{display:grid;place-items:center;min-width:58px;height:58px;border-radius:18px;background:var(--r4a-blue);color:#fff;font-weight:900;font-size:18px;direction:ltr}
.r4and-hero h2{margin:0 0 5px;font-size:23px;color:var(--r4a-blue-2)}
.r4and-hero p{margin:0;color:var(--r4a-muted);font-size:14px;line-height:1.7}
.r4and-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;background:#eef3f9;padding:6px;border-radius:18px}
.r4and-tab{border:0;background:transparent;color:#58708d;padding:11px 8px;border-radius:13px;font-weight:800;cursor:pointer;transition:.18s ease}
.r4and-tab.is-active{background:#fff;color:var(--r4a-blue);box-shadow:0 3px 14px rgba(15,63,119,.09)}
.r4and-panel{display:none}
.r4and-panel.is-active{display:block}
.r4and-card{background:#fff;border:1px solid var(--r4a-line);border-radius:24px;padding:20px;box-shadow:0 12px 35px rgba(26,60,96,.07)}
.r4and-card h3{margin:0;color:var(--r4a-blue-2);font-size:20px}
.r4and-card h4{color:var(--r4a-blue-2);margin:0 0 10px}
.r4and-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:18px}
.r4and-card-head p{margin:5px 0 0;color:var(--r4a-muted);font-size:13px;line-height:1.7}
.r4and-pill,.r4and-score{white-space:nowrap;border-radius:999px;background:#edf5ff;color:var(--r4a-blue);padding:6px 10px;font-size:12px;font-weight:900}
.r4and-label{display:block;margin:0 0 7px;color:#49637f;font-size:13px;font-weight:800}
.r4and-input-row{display:flex;gap:9px;align-items:stretch}
.r4and-input-row input{flex:1;min-width:0;border:1px solid #cbd8e7;border-radius:14px;background:#fff;color:#17365c;padding:13px 14px;font-size:16px;outline:none}
.r4and-input-row input:focus{border-color:var(--r4a-blue);box-shadow:0 0 0 3px rgba(22,79,143,.09)}
.r4and-primary,.r4and-secondary{border:0;border-radius:14px;padding:12px 18px;font-weight:900;cursor:pointer}
.r4and-primary{background:var(--r4a-blue);color:#fff;min-width:92px}
.r4and-secondary{background:#eef4fb;color:var(--r4a-blue);margin-top:14px}
.r4and-quick-row{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0 0}
.r4and-chip{border:1px solid #d7e1ed;background:#f8fbff;color:var(--r4a-blue);border-radius:999px;padding:7px 11px;font-weight:800;cursor:pointer;direction:ltr}
.r4and-result{position:relative;margin-top:16px;padding:18px;border-radius:19px;background:var(--r4a-soft);border:1px solid #e4ecf5}
.r4and-result-label{font-size:12px;color:var(--r4a-muted);margin-bottom:5px}
.r4and-russian{direction:ltr;text-align:left;unicode-bidi:isolate;color:#102f55;font-weight:800;line-height:1.55}
.r4and-number-russian{font-size:25px;padding-left:74px}
.r4and-number-meta{font-size:12px;color:var(--r4a-muted);margin-top:6px;direction:ltr;text-align:left}
.r4and-copy{border:1px solid #cbd8e7;background:#fff;color:var(--r4a-blue);border-radius:10px;padding:7px 11px;font-size:12px;font-weight:800;cursor:pointer}
.r4and-result>.r4and-copy{position:absolute;top:13px;left:13px}
.r4and-variants{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.r4and-mini-card{border:1px solid var(--r4a-line);border-radius:16px;padding:12px;background:#fff}
.r4and-mini-card span,.r4and-mini-card small{display:block;color:var(--r4a-muted);font-size:11px}
.r4and-mini-card strong{display:block;direction:ltr;text-align:left;color:#17365c;margin:5px 0;font-size:15px}
.r4and-date-results{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.r4and-date-card{border:1px solid var(--r4a-line);border-radius:17px;padding:14px;background:#fbfdff}
.r4and-date-card span{display:block;font-size:11px;color:var(--r4a-muted);margin-bottom:6px}
.r4and-date-card strong{font-size:16px}
.r4and-copy-date{margin-top:12px}
.r4and-tip{margin-top:14px;padding:12px 14px;background:#f7f9fc;border-radius:14px;color:#536b86;font-size:13px;line-height:1.8}
.r4and-tip span{direction:ltr;unicode-bidi:isolate;display:inline-block;color:#17365c;font-weight:700}
.r4and-practice-switch{display:flex;gap:5px;background:#eef3f8;padding:5px;border-radius:14px;width:max-content;max-width:100%;margin-bottom:15px}
.r4and-segment{border:0;background:transparent;color:#647a92;padding:8px 16px;border-radius:10px;font-weight:800;cursor:pointer}
.r4and-segment.is-active{background:#fff;color:var(--r4a-blue);box-shadow:0 2px 10px rgba(0,0,0,.06)}
.r4and-question-box{border:1px solid var(--r4a-line);border-radius:19px;padding:17px;background:#fbfdff}
.r4and-question-label{font-size:12px;color:var(--r4a-muted)}
.r4and-question{font-size:25px;font-weight:900;color:var(--r4a-blue-2);margin:7px 0 15px;direction:ltr;text-align:center}
.r4and-options{display:grid;gap:8px}
.r4and-option{border:1px solid #d8e2ee;background:#fff;border-radius:13px;padding:11px 13px;text-align:left;direction:ltr;color:#17365c;font-weight:700;cursor:pointer}
.r4and-option:hover{border-color:#9eb9d9}
.r4and-option.is-correct{border-color:#86c7a8;background:#eefaf4;color:var(--r4a-ok)}
.r4and-option.is-wrong{border-color:#e5aaa4;background:#fff2f1;color:var(--r4a-bad)}
.r4and-feedback{min-height:22px;margin-top:10px;font-size:13px;font-weight:800}
.r4and-feedback.ok{color:var(--r4a-ok)}
.r4and-feedback.bad{color:var(--r4a-bad)}
.r4and-reference-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.r4and-table-wrap{overflow:auto;border:1px solid var(--r4a-line);border-radius:15px}
.r4and-table{width:100%;border-collapse:collapse;min-width:390px;background:#fff;font-size:12px}
.r4and-table th,.r4and-table td{padding:9px 10px;border-bottom:1px solid #edf1f6;text-align:right}
.r4and-table th{background:#f5f8fc;color:#4f6680;font-size:11px}
.r4and-table td[lang=ru]{direction:ltr;text-align:left;color:#17365c;font-weight:700}
.r4and-info{margin-top:16px;border:1px solid var(--r4a-line);border-radius:15px;background:#fafcff}
.r4and-info summary{cursor:pointer;padding:12px 14px;color:var(--r4a-blue);font-weight:800}
.r4and-info-body{padding:0 14px 12px;color:#667b93;font-size:12px;line-height:1.8}
.r4and-info-body p{margin:7px 0}
.r4and-info-body span{direction:ltr;unicode-bidi:isolate;display:inline-block}
@media(max-width:700px){.r4and{padding:0 8px}.r4and-tabs{grid-template-columns:1fr 1fr}.r4and-variants,.r4and-date-results,.r4and-reference-grid{grid-template-columns:1fr}.r4and-card{padding:16px}.r4and-hero{padding:15px}.r4and-hero h2{font-size:20px}.r4and-number-russian{font-size:21px;padding-left:0;padding-top:34px}.r4and-input-row{flex-direction:column}.r4and-primary{width:100%}}