.tool-tabs{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:22px}.sandbox-grid{display:grid;grid-template-columns:minmax(205px,.85fr) minmax(0,2fr);gap:22px;align-items:start}.hv-rules{display:grid;gap:6px;padding:10px;border:1px solid var(--line);background:#fffefb;border-radius:14px}.hv-rules>button{display:flex;align-items:center;gap:10px;text-align:left;padding:11px;border-radius:9px;font-size:12px;line-height:1.6}.hv-rules>button>span{font-size:10px;color:#647357}.hv-rules>button[aria-pressed=true]{background:#e9f0e2;color:#395b35;box-shadow:inset 3px 0 #466c50}.hv-stage{min-width:0;padding:25px;border:1px solid var(--line);border-radius:16px;background:#fffefb}.hv-stage h2{margin:8px 0}.hv-stage>p{font-size:12px;line-height:1.9}.hv-conversion{display:grid;grid-template-columns:minmax(0,1fr) 30px minmax(0,1fr);align-items:center;gap:10px;padding:26px 8px;margin:20px 0;background:#f1f5eb;border-radius:12px}.hv-conversion>div{display:grid;gap:14px;text-align:center;min-width:0}.hv-conversion strong{font-size:31px;color:#3e633f;overflow-wrap:anywhere}.hv-conversion small{font-size:9px;letter-spacing:1px;color:#5b7050}.hv-conversion b{display:inline-block;border:1px solid #c8d6bb;border-radius:5px;padding:3px 6px;margin:2px;font-size:13px;background:#fff}.hv-arrow{font-size:23px;color:#9a6e31}.hv-conversion.is-playing b{animation:hv-merge .6s both;animation-delay:calc(var(--i)*70ms)}@keyframes hv-merge{from{opacity:.15;transform:translateY(12px) scale(.85)}to{opacity:1;transform:none}}.hv-example-buttons{display:flex;flex-wrap:wrap;gap:8px}.hv-kanji{display:flex;align-items:center;gap:20px;padding:20px 0;min-width:0}.hv-character{font-size:70px;color:#495f3d;flex-shrink:0}.hv-kanji .jp{font-size:22px}.hv-kanji small{font-size:13px}.hv-kanji p{font-size:12px;margin:8px 0;overflow-wrap:anywhere}.hv-limit{padding:13px;border:1px solid #e2d5ad;border-radius:9px;background:#fcf7e9;color:#71603c}.tool-source{margin-top:15px;font-size:11px;line-height:1.9}.tool-source summary{cursor:pointer}.tool-source a{color:#466c50;text-decoration:underline}.tool-card-filters{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:18px}.tool-card-filters>label{display:flex;gap:8px;align-items:center;font-size:11px}.tool-card-filters select{max-width:240px}.leitner-boxes{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin:20px 0}.leitner-boxes>div{display:grid;gap:6px;padding:15px 8px;text-align:center;border:1px solid #d5decf;background:#fffefb;border-radius:11px}.leitner-boxes small{font-size:10px;color:#647357}.leitner-boxes strong{font-size:25px;color:#466c50}.leitner-boxes span{font-size:10px;color:#667360}.tool-start{border:1px solid var(--line);border-radius:14px;padding:30px;background:#fffefb;max-width:760px;margin:25px auto;text-align:center}.tool-start h2{margin:12px 0}.tool-start p{margin:16px 0;line-height:1.9}.tool-session-head{display:flex;justify-content:space-between;align-items:center;gap:10px;max-width:760px;margin:18px auto;font-size:11px}.learning-card{max-width:760px;margin:0 auto;background:#fffefb;border:1px solid #d7dfcf;border-radius:18px;overflow:hidden;padding:24px}.tool-flip{display:grid;justify-items:center;gap:15px;width:100%;padding:22px 12px;min-height:230px;border-radius:12px;background:#f0f5e9}.tool-flip>strong{font-size:64px;line-height:1.7;overflow-wrap:anywhere;max-width:100%}.tool-flip>small{font-size:11px;color:#667360}.tool-card-meaning{font-size:24px;font-weight:600;color:#466c50}.tool-card-back{display:grid;gap:20px;margin-top:20px}.tool-card-audio{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.tool-card-audio>.jp{font-size:23px;line-height:2.3}.tool-card-audio>small{font-size:12px}.hv-decode,.mnemonic{padding:16px;border:1px solid #d9e4cc;border-radius:10px;background:#f4f7ee;line-height:1.9;font-size:12px}.hv-decode small{color:#657456}.mnemonic h3,.tool-lego h3{font-size:13px;margin-bottom:9px}.mnemonic p+p{margin-top:8px}.tool-lego>p{font-size:12px;margin-top:10px;color:#667360}.tool-card-back .syntax-token-text{font-size:19px}.learning-tools .flash-actions{flex-wrap:wrap}.learning-tools rt{font-size:11px}.tool-card-back .syntax-token>small{font-size:10px}
@media(max-width:760px){.sandbox-grid{grid-template-columns:1fr}.hv-rules{grid-template-columns:1fr 1fr}.hv-rules>button{font-size:11px;padding:9px;gap:6px}.hv-stage{padding:18px}.hv-conversion{padding:18px 8px;gap:5px}.hv-conversion strong{font-size:25px}.hv-kanji{gap:12px}.hv-character{font-size:57px}.tool-start{padding:22px}.learning-card{padding:15px}.leitner-boxes{gap:5px}.leitner-boxes>div{padding:11px 3px}.leitner-boxes small,.leitner-boxes span{font-size:9px}.tool-tabs>.btn{flex:1 1 150px}.tool-card-filters select{max-width:100%}.tool-card-filters>label:has(select){width:100%}.tool-flip>strong{font-size:48px}.hv-example-buttons>.btn{min-height:43px}}
@media(prefers-reduced-motion:reduce){.hv-conversion.is-playing b{animation:none}}