/* Subject hubs only. Canonical navy/orange identity and accessible native disclosures. */
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body.rk-study header{position:relative;background:#fff;border-bottom:1px solid var(--study-line)}
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body.rk-study .btn:hover{background:#b93d00}
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body.rk-study .pagehero p{font-size:16px;line-height:1.6;color:var(--study-muted);max-width:640px;margin:0 0 18px}
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body.rk-study .topic-group{border:1px solid #dce6f0;margin:8px 17px;border-radius:7px;background:#fff;box-shadow:none;overflow:hidden}body.rk-study .topic-group>summary{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:600;line-height:1.5;padding:12px 13px;cursor:pointer;list-style:none;min-height:44px}body.rk-study .topic-group>summary::-webkit-details-marker{display:none}body.rk-study .topic-group>summary>span{color:#466786;font-size:11px;flex-shrink:0}body.rk-study .topic-group>summary::after{content:'+';margin-left:auto}body.rk-study .topic-group[open]>summary::after{content:'−'}body.rk-study .topic-group[open]{border-color:#f0ba9c}body.rk-study .topic-group[open]>summary{background:#fff8f3}
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