:root{--ink:#153344;--muted:#536975;--accent:#006d82;--accent-dark:#005166;--pale:#eaf6f8;--line:#cddfe5;--paper:#fff;--bg:#eef3f6;--amber:#975614;--amber-bg:#fff2dc;--radius:18px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}main{max-width:1100px;margin:auto;padding:24px 26px 48px}header{margin:0 0 24px}.topline{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:18px}.brand{font-size:14px;font-weight:700;letter-spacing:.08em;color:var(--accent)}.language{display:flex;gap:4px;border:1px solid var(--line);border-radius:22px;padding:3px;background:white}.language a{padding:5px 12px;border-radius:18px;font-size:14px;text-decoration:none;color:var(--muted)}.language a[aria-current=page]{background:var(--ink);color:white}h1{font-size:32px;line-height:1.22;letter-spacing:-.025em;margin:0 0 12px;font-weight:740}header p{margin:6px 0;color:var(--muted)}h2{font-size:21px;line-height:1.4;margin:0 0 19px;display:flex;align-items:center;gap:10px}h3{font-size:17px;margin:18px 0 10px}.number{display:inline-grid;place-items:center;width:28px;height:28px;flex-shrink:0;background:var(--pale);color:var(--accent);font-size:15px;border-radius:50%}.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:25px;margin:18px 0;box-shadow:0 4px 20px #15334405}.inputs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.field label{display:block;font-size:15px;font-weight:680;margin-bottom:9px}.unit{font-size:13px;color:var(--muted);font-weight:500}.field small,.source{display:block;font-size:13px;line-height:1.5;color:var(--muted);margin-top:7px}input{width:100%;padding:13px 14px;border:1.5px solid #a7c4cf;border-radius:9px;font:inherit;font-size:19px;line-height:1.2;color:var(--ink);background:#f8fcfd}input:focus{outline:3px solid #a7d6e0;outline-offset:2px;border-color:var(--accent)}button{font:inherit;font-size:15px;font-weight:600;line-height:1.4;border:1px solid #a7c4cf;border-radius:9px;background:white;color:var(--accent-dark);padding:10px 17px;cursor:pointer}button.primary{background:var(--accent);color:white;border-color:var(--accent);padding:12px 23px}button:hover{filter:brightness(.96)}button:disabled{cursor:default;opacity:.45}.buttons{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:20px}.status{margin:12px 0 0;min-height:24px;font-size:14px;color:var(--muted)}.error{color:#a33124}.metrics{display:grid;grid-template-columns:1fr 1fr;gap:18px}.metric{border-radius:14px;border:1px solid var(--line);background:#f6fafc;padding:22px;min-width:0}.metric.a2{background:var(--pale);border-color:#a6d1dc}.metric h3{font-size:15px;font-weight:600;margin:0;color:var(--muted)}.value{font-size:42px;letter-spacing:-.025em;line-height:1.3;font-weight:760;font-variant-numeric:tabular-nums;margin:8px 0 16px}.comparison{display:flex;justify-content:space-between;align-items:center;gap:14px;border-top:1px solid #cbdce2;padding-top:13px;font-size:14px}.comparison strong{font-size:19px;white-space:nowrap;color:var(--ink)}.badge{display:inline-block;font-size:14px;font-weight:650;border-radius:6px;padding:5px 9px;margin-top:12px;background:#e1ecf0;color:#32566b}.badge.above{background:var(--amber-bg);color:var(--amber)}.context-note{font-size:14px;color:var(--muted);margin:16px 0 0}.joint{padding:17px 20px;background:var(--ink);border-radius:11px;color:#fff;margin-top:20px}.joint-label{font-size:13px;color:#b4dce4;margin:0 0 5px}.joint p:last-child{font-size:18px;font-weight:650;margin:0}.small{font-size:13px;color:var(--muted)}.result-note{font-size:14px;color:var(--muted);margin:12px 0}details{border-top:1px solid var(--line);padding-top:15px;margin-top:18px}summary{font-size:15px;color:var(--accent-dark);font-weight:650;cursor:pointer}details p{font-size:14px;margin:10px 0}.helper-cols{display:grid;grid-template-columns:1.2fr 1fr;gap:30px}.helper-cols>div{min-width:0}.helper-grid{display:grid;grid-template-columns:62px 1fr 1fr;gap:9px;align-items:center;font-size:14px}.helper-grid input{font-size:16px;padding:10px}.months{display:flex;align-items:center;gap:10px;margin:14px 0;font-size:14px;flex-wrap:wrap}.months input{width:120px}.preview{background:#f0f6f8;border-radius:8px;padding:12px;margin:12px 0;font-size:14px;min-height:46px}.tablewrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:14px;margin:12px 0}th,td{padding:12px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}th{background:#f0f5f7}td:first-child,th:first-child{text-align:left}.notice{padding:10px 13px;border-left:3px solid var(--accent);background:var(--pale)}a{color:var(--accent-dark);text-underline-offset:3px}.downloads{display:flex;gap:12px 20px;flex-wrap:wrap;margin:14px 0;font-size:14px}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#f1f5f7;padding:16px;border-radius:9px;font-size:13px}footer{display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:13px;padding:10px 3px;flex-wrap:wrap}[hidden]{display:none!important}@media(max-width:760px){main{padding:20px 14px 36px}h1{font-size:27px}.panel{padding:19px}.inputs,.helper-cols{grid-template-columns:1fr}.inputs{gap:17px}.metrics{gap:10px}.metric{padding:14px}.value{font-size:32px}.metric h3{font-size:14px;min-height:44px}.comparison{display:block;font-size:13px}.comparison strong{display:block;margin-top:4px;font-size:18px}.badge{font-size:13px}.helper-cols{gap:8px}.brand{font-size:12px}.language a{padding:5px 9px}.joint p:last-child{font-size:17px}.buttons button.primary{flex-grow:1}.topline{gap:8px}}@media(max-width:340px){.metrics{grid-template-columns:1fr}.metric h3{min-height:0}}@media print{body{background:#fff}.buttons,.language,footer{display:none}.panel{break-inside:avoid;box-shadow:none}}

/* Shared label, input, help and source rows keep all three measurements aligned. */
.inputs{column-gap:24px;row-gap:0}
.inputs>.field{display:grid;grid-template-rows:subgrid;grid-row:span 4;min-width:0}
.inputs>.field>label{display:flex;flex-direction:column;justify-content:space-between;gap:7px;margin-bottom:10px;font-size:16px;line-height:1.45}
.inputs>.field .unit{display:block;font-size:12px;line-height:1.4;font-weight:600;color:var(--accent);letter-spacing:.025em}
.inputs>.field>input{height:52px;min-width:0;margin:0;align-self:start}
.inputs>.field>small{margin-top:9px;line-height:1.5}
.inputs>.field>.source:empty{display:none}
@media(max-width:760px){.inputs{row-gap:0}.inputs>.field{margin-bottom:21px}.inputs>.field:last-child{margin-bottom:0}.inputs>.field>label{gap:4px}.inputs>.field>input{height:50px}}

.group-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:17px 0}
.group-card{border:1px solid var(--line);border-radius:10px;background:#f6f9fa;padding:15px 17px;min-width:0}
.group-card.selected{border:2px solid var(--accent);background:var(--pale);padding:14px 16px}
.group-card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:9px;flex-wrap:wrap}
.group-card h4{font-size:15px;line-height:1.5;margin:0;color:var(--ink)}
.group-card p{white-space:pre-line;font-size:13px;line-height:1.8;margin:9px 0 0;color:var(--muted)}
.current-group{font-size:11px;line-height:1.5;padding:3px 7px;border-radius:5px;background:var(--accent);color:white;font-weight:650;white-space:nowrap}
.selected-range{font-size:14px!important;font-weight:650;color:var(--accent-dark);margin:13px 0 7px!important}
.study-example{font-size:14px!important;margin:19px 0 10px!important;line-height:1.75}
@media(max-width:530px){.group-grid{grid-template-columns:1fr}.group-card-top{align-items:center}}

/* Descriptive development-cohort percentile positions, separate from classification. */
.percentile{border-top:1px solid var(--line);margin-top:18px;padding-top:16px}
.percentile h4{font-size:13px;font-weight:600;color:var(--muted);margin:0;line-height:1.5}
.percentile-value{font-size:21px;font-weight:720;margin:5px 0 15px;line-height:1.5;font-variant-numeric:tabular-nums}
.percentile-track{height:13px;position:relative;background:#dce9ed;border-radius:7px;margin:4px 3px 0}
.percentile-tick{position:absolute;top:-3px;bottom:-3px;border-left:1px solid #a9c1c9}
.percentile-band{position:absolute;top:0;height:13px;background:#70abb7;border:1px solid #478a9a;border-radius:5px;min-width:2px;max-width:100%}
.percentile-pin{position:absolute;top:50%;width:10px;height:10px;background:var(--accent);border:2px solid white;box-shadow:0 0 0 1px var(--accent);border-radius:50%;transform:translate(-50%,-50%)}
.percentile-scale{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;line-height:1.4;margin:7px 0 10px}
.percentile-description{font-size:13px;line-height:1.7;margin:10px 0 0;color:var(--ink)}
.percentile-details{border:0;margin-top:8px;padding-top:0}.percentile-details summary{font-size:12px;font-weight:500}.percentile-details p{font-size:12px;color:var(--muted)}
.percentile-context{margin-top:14px}
@media(max-width:580px){.metrics{grid-template-columns:1fr}.metric h3{min-height:0}.comparison{display:flex}.comparison strong{margin-top:0}.percentile-value{font-size:21px}.percentile-scale{font-size:11px}}

/* r5 presentation update; calculation and percentile references remain r4. */
header{margin-bottom:18px}.topline{margin-bottom:13px}h1{font-size:30px;margin-bottom:10px}
.panel{padding:20px;margin:14px 0}h2{margin-bottom:15px;font-size:20px}
.inputs>.field>label{gap:5px;margin-bottom:8px}.inputs>.field>small{margin-top:7px}
.buttons{margin-top:16px}.status{min-height:0;margin-top:9px}.status:empty{display:none}
.metric{padding:18px}.value{margin:6px 0 12px}
.comparison{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:7px 9px;padding-top:10px;font-size:13px}
.reference-value{display:flex;align-items:baseline;gap:6px;white-space:nowrap}
.comparison strong{display:inline;font-size:16px;margin:0}
.comparison .badge{font-size:12px;margin:0;padding:3px 7px}
.percentile{margin-top:13px;padding-top:12px}.percentile-value{margin:3px 0 11px;font-size:20px}
.percentile-description{margin-top:7px}.percentile-details{margin-top:6px}
.percentile-context{font-size:13px;line-height:1.65;margin-top:11px}
.joint{display:flex;align-items:baseline;flex-wrap:wrap;gap:3px 8px;padding:10px 13px;background:var(--pale);color:var(--ink);border:1px solid var(--line);margin-top:12px}
.joint .joint-label{color:var(--muted);font-size:14px;white-space:nowrap;margin:0}
.joint p:last-child{font-size:15px;line-height:1.5}.result-note{font-size:13px;margin:8px 0}
details{margin-top:14px;padding-top:12px}.percentile-details{border:0;padding-top:0}
.help-panel h2{font-size:18px;margin-bottom:11px}.help-panel details{margin-top:11px;padding-top:10px}
footer{padding-top:5px}
@media(max-width:760px){.panel{padding:17px}h1{font-size:26px}.metric{padding:15px}.inputs>.field{margin-bottom:17px}.comparison{display:flex}.comparison strong{display:inline;margin:0}}