.r4an{--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}
.r4an *{box-sizing:border-box}.r4an button,.r4an input{font:inherit}.r4an-shell{display:flex;flex-direction:column;gap:14px}
.r4an-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}
.r4an-hero-icon{display:flex;align-items:center;justify-content:center;gap:2px;min-width:62px;height:58px;border-radius:18px;background:#fff;border:1px solid #dbe5f1;box-shadow:0 4px 16px rgba(15,63,119,.07);direction:ltr}
.r4an-hero-icon span{font-weight:950;color:var(--r4a-blue);font-size:20px;line-height:1}.r4an-hero-icon span:nth-child(2){font-size:26px;color:#2d6baa}.r4an-hero-icon span:nth-child(3){font-size:17px;color:#7599bf}
.r4an-hero h2{margin:0 0 5px;font-size:23px;color:var(--r4a-blue-2)}.r4an-hero p{margin:0;color:var(--r4a-muted);font-size:14px;line-height:1.7}
.r4an-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;background:#eef3f9;padding:6px;border-radius:18px}.r4an-tab{border:0;background:transparent;color:#58708d;padding:11px 8px;border-radius:13px;font-weight:800;cursor:pointer;transition:.18s ease}.r4an-tab.is-active{background:#fff;color:var(--r4a-blue);box-shadow:0 3px 14px rgba(15,63,119,.09)}
.r4an-panel{display:none}.r4an-panel.is-active{display:block}.r4an-card{background:#fff;border:1px solid var(--r4a-line);border-radius:24px;padding:20px;box-shadow:0 12px 35px rgba(26,60,96,.07)}
.r4an-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:18px}.r4an-card h3{margin:0;color:var(--r4a-blue-2);font-size:20px}.r4an-card-head p{margin:5px 0 0;color:var(--r4a-muted);font-size:13px;line-height:1.7}.r4an-pill,.r4an-score{white-space:nowrap;border-radius:999px;background:#edf5ff;color:var(--r4a-blue);padding:6px 10px;font-size:12px;font-weight:900}
.r4an-label,.r4an-field label{display:block;margin-bottom:7px;font-size:12px;font-weight:850;color:#4f6680}.r4an-input-row{display:grid;grid-template-columns:1fr auto;gap:9px}.r4an-number-input,.r4an-builder-number{width:100%;height:52px;border:1px solid #ccd8e6;border-radius:18px;padding:0 16px;background:#fff;color:var(--r4a-ink);outline:none;direction:ltr;text-align:left;font-size:17px;font-weight:800}.r4an-number-input:focus,.r4an-builder-number:focus{border-color:#79a4cf;box-shadow:0 0 0 3px rgba(22,79,143,.08)}
.r4an-primary,.r4an-secondary,.r4an-copy{border:0;border-radius:16px;padding:0 18px;min-height:48px;font-weight:900;cursor:pointer}.r4an-primary{background:var(--r4a-blue);color:#fff}.r4an-secondary{background:#edf4fb;color:var(--r4a-blue)}.r4an-copy{background:#fff;border:1px solid #d8e3ef;color:var(--r4a-blue);min-height:38px;padding:7px 13px}
.r4an-quick-row,.r4an-example-row{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.r4an-chip,.r4an-example{border:1px solid #dce6f0;background:#f8fbfe;color:#345775;border-radius:999px;padding:7px 12px;font-weight:800;cursor:pointer;direction:ltr}.r4an-chip:hover,.r4an-example:hover{background:#edf5ff;border-color:#b9cde2}
.r4an-result,.r4an-builder-result{margin-top:16px;border:1px solid #dbe6f2;border-radius:20px;background:linear-gradient(145deg,#f9fcff,#f1f7fd);padding:17px;position:relative}.r4an-result-label{display:block;color:var(--r4a-muted);font-size:11px;font-weight:800;margin-bottom:6px}.r4an-result-ru,.r4an-builder-ru{display:block;font-size:25px;line-height:1.6;color:var(--r4a-blue-2);font-weight:900;direction:ltr;text-align:left;unicode-bidi:isolate;padding-left:72px;overflow-wrap:anywhere}.r4an-result-number,.r4an-builder-ar,.r4an-builder-rule{display:block;color:#5f7690;font-size:12px;margin-top:6px}.r4an-result .r4an-copy{position:absolute;left:14px;top:14px}
.r4an-breakdown{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}.r4an-part{border:1px solid #e1e8f1;border-radius:15px;background:#fff;padding:11px;min-width:0}.r4an-part small{display:block;color:var(--r4a-muted);font-size:10px;margin-bottom:4px}.r4an-part strong{display:block;direction:ltr;text-align:left;font-size:13px;color:#264f78;overflow-wrap:anywhere}.r4an-part span{display:block;color:#7890a8;font-size:10px;margin-top:4px}
.r4an-builder-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.r4an-field{min-width:0}.r4an-picker{position:relative}.r4an-picker-trigger{width:100%;min-height:52px;border:1px solid #ccd8e6;border-radius:20px;background:#fff;color:var(--r4a-ink);padding:11px 48px 11px 16px;text-align:right;cursor:pointer;position:relative;display:flex;align-items:center;gap:8px;overflow:hidden}.r4an-picker-trigger:after{content:'⌄';position:absolute;right:17px;top:50%;transform:translateY(-52%);font-size:20px;color:#66809a}.r4an-picker-trigger .r4an-picker-text{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.r4an-picker-menu{display:none;position:absolute;z-index:40;top:calc(100% + 7px);right:0;left:0;max-height:310px;overflow:auto;background:#fff;border:1px solid #d8e2ed;border-radius:20px;padding:6px;box-shadow:0 16px 42px rgba(20,55,90,.17)}.r4an-picker.is-open .r4an-picker-menu{display:block}.r4an-picker-option{width:100%;border:0;background:#fff;color:#37536f;padding:12px 13px;border-radius:14px;display:grid;grid-template-columns:1fr auto;gap:9px;align-items:center;text-align:right;cursor:pointer}.r4an-picker-option:hover,.r4an-picker-option.is-selected{background:#edf5ff;color:var(--r4a-blue)}.r4an-picker-option .ru{direction:ltr;unicode-bidi:isolate;font-weight:800;text-align:left;font-size:12px}
.r4an-practice-switch{display:flex;gap:6px;background:#edf3f9;border-radius:16px;padding:5px;margin-bottom:16px;flex-wrap:wrap}.r4an-segment{flex:1;border:0;background:transparent;color:#627b95;border-radius:12px;padding:9px 12px;font-weight:850;cursor:pointer;min-width:120px}.r4an-segment.is-active{background:#fff;color:var(--r4a-blue);box-shadow:0 3px 12px rgba(15,63,119,.08)}
.r4an-question-box{border:1px solid var(--r4a-line);border-radius:20px;padding:17px;background:#fbfdff}.r4an-question-label{font-size:12px;color:var(--r4a-muted);font-weight:800}.r4an-question{font-size:28px;color:var(--r4a-blue-2);font-weight:950;margin:10px 0 16px;min-height:44px;overflow-wrap:anywhere}.r4an-options{display:grid;grid-template-columns:1fr 1fr;gap:8px}.r4an-option{border:1px solid #dce5ef;background:#fff;color:#31526f;border-radius:15px;padding:12px 10px;font-weight:800;cursor:pointer;direction:ltr;unicode-bidi:isolate;overflow-wrap:anywhere}.r4an-option.is-correct{border-color:#83c4a5;background:#eefaf4;color:#126b42}.r4an-option.is-wrong{border-color:#e6a49e;background:#fff3f2;color:#91362f}.r4an-feedback{min-height:28px;margin:11px 0 8px;font-size:13px;font-weight:800}.r4an-feedback.ok{color:var(--r4a-ok)}.r4an-feedback.bad{color:var(--r4a-bad)}
.r4an-subtitle{margin:20px 0 10px;color:#315a80;font-size:15px}.r4an-subtitle:first-of-type{margin-top:0}.r4an-reference-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.r4an-ref-item{border:1px solid #e1e8f1;border-radius:14px;background:#fff;padding:9px 8px;min-width:0}.r4an-ref-item b{display:block;color:var(--r4a-blue);font-size:12px;direction:ltr;text-align:left}.r4an-ref-item span{display:block;color:#3f5e7a;font-size:11px;font-weight:750;direction:ltr;text-align:left;overflow-wrap:anywhere;margin-top:3px}.r4an-rules{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:18px}.r4an-rule-card{border-radius:16px;background:#f4f8fd;border:1px solid #e0e9f2;padding:12px 13px;display:flex;gap:10px;align-items:flex-start}.r4an-rule-card>strong{min-width:38px;color:var(--r4a-blue);font-size:16px;direction:ltr}.r4an-rule-card span{font-size:12px;color:#58708a;line-height:1.7}.r4an-rule-card b{color:#244d75}
@media(max-width:760px){.r4an{padding:0 8px}.r4an-tabs{grid-template-columns:1fr 1fr}.r4an-card{padding:16px}.r4an-hero{padding:15px}.r4an-hero h2{font-size:20px}.r4an-builder-grid{grid-template-columns:1fr}.r4an-breakdown{grid-template-columns:1fr 1fr}.r4an-reference-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:520px){.r4an-input-row{grid-template-columns:1fr}.r4an-primary{width:100%}.r4an-result-ru,.r4an-builder-ru{font-size:21px;padding-left:0;padding-top:38px}.r4an-result .r4an-copy{top:12px;left:12px}.r4an-breakdown,.r4an-options,.r4an-rules{grid-template-columns:1fr}.r4an-reference-grid{grid-template-columns:repeat(2,1fr)}.r4an-picker-menu{max-height:260px}.r4an-practice-switch{display:grid;grid-template-columns:1fr}.r4an-segment{min-width:0}.r4an-card-head{align-items:flex-start}}