/* 두 훈련이 함께 사용하는 화면·조작 요소 */
header{max-width:1000px;padding:28px;gap:16px}.brand{font-size:18px;font-weight:850;color:var(--ink);text-decoration:none}.brand span{font-size:inherit;font-weight:500;margin-left:8px}.edition{font-size:12px;color:var(--muted)}main{max-width:460px;margin:25px auto 0;padding:0 20px}h1{font-size:42px;line-height:1.15;letter-spacing:-.06em;margin:12px 0}.note{font-size:12px;line-height:1.7;color:var(--muted)}.note:empty{display:none}.activity-nav{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:18px;padding-top:12px;border-top:1px solid var(--line)}.activity-nav a{text-decoration:none;font-size:13px;color:var(--ink);padding:10px 0}.bottom-links{display:flex;justify-content:space-between;margin-top:20px;padding:0 3px}.bottom-links button{font-size:13px}#resultRanking{margin-top:8px}#rankList .row{align-items:flex-start}#rankList .row>div:first-child{min-width:0;overflow-wrap:anywhere}.row small{line-height:1.5}.full{width:100%;margin-top:8px}footer{padding:30px 12px calc(20px + env(safe-area-inset-bottom))}dialog>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}dialog>div button{width:100%;min-width:0}a:focus-visible{outline:3px solid #718d32;outline-offset:3px}@media(max-width:520px){header{padding:20px}.edition{font-size:10px}main{margin-top:12px}h1{font-size:38px}}@media(max-width:360px){.brand{font-size:16px}.brand span{margin-left:4px}.activity-nav{gap:8px}}

.hub-share{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:7px 10px;margin:18px 0 0;padding:8px 0;color:var(--muted)}.hub-share p{font-size:11px;line-height:1.5;margin:0;text-align:center}.hub-share button{display:inline-flex;align-items:center;justify-content:center;gap:5px;border:1px solid var(--line);border-radius:20px;background:transparent;color:var(--ink);font-size:12px;font-weight:650;min-height:34px;padding:6px 11px}.hub-share button:active{background:var(--lime)}.hub-share [role=status]{flex-basis:100%;font-size:11px;text-align:center}.hub-share [role=status]:empty{display:none}.hub-share textarea{width:100%;min-height:76px;padding:10px;border:1px solid var(--line);border-radius:10px;background:white;color:var(--ink);font:inherit;font-size:12px;resize:vertical}

/* 암산과 공통 랭킹 탐색 */
.arithmetic-modes{grid-template-columns:repeat(4,minmax(0,1fr))}.courses small{display:block;margin-top:5px;font-size:12px;font-weight:500;color:var(--muted,#6c7971)}
.arithmetic-question{font-size:clamp(27px,7vw,44px)!important;white-space:nowrap;letter-spacing:-.04em;display:flex;align-items:center;justify-content:center;min-height:130px;margin:10px 0!important}.game-preview .arithmetic-question{min-height:65px;font-size:26px!important}
.rank-tabs{display:flex;gap:6px;margin:20px 0}.rank-tabs button{flex:1;border:1px solid #dfe4d9;background:transparent;color:#263c36;border-radius:10px;padding:11px 4px;font:inherit;font-size:14px;font-weight:700}.rank-tabs button[aria-pressed=true]{background:#263c36;color:#d7f280}.distribution{margin:20px 0}.distribution svg{display:block;width:100%;height:auto}.distribution .compare{display:flex;gap:8px;align-items:stretch;margin:18px 0 8px}.distribution input{min-width:0;flex:1}.distribution .compare button{width:auto;margin:0;padding:10px 18px}.distribution output{display:block;font-size:24px;font-weight:800;margin:15px 0}.distribution details{font-size:12px;color:#6c7971}.distribution table{width:100%;text-align:right}.distribution th{text-align:right}
@media(max-width:380px){.arithmetic-modes button{padding:14px 4px}.arithmetic-modes strong{font-size:14px}}

.home-hub{justify-content:center;margin-top:14px}.home-hub a{display:block;width:100%;text-align:center;border:1px solid var(--line);border-radius:12px;padding:13px 16px;background:transparent;font-weight:650}

#rankList .rank-condition{font-size:14px;font-weight:400;color:var(--ink);line-height:1.6}#rankList .rank-condition strong{font-size:inherit;font-weight:800}#ranking>label,#ranking .rank-search label{font-size:14px}#ranking>select{font-weight:700}