:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif}body{margin:0;padding:0;background:#1e1e1e;color:#fff;box-sizing:border-box}.container{width:100%;max-width:820px;padding:70px 20px 0;text-align:center;display:flex;flex-direction:column;align-items:center;box-sizing:border-box}button{border-radius:8px;border:1px solid transparent;padding:10px 18px;font-size:16px;cursor:pointer;background:#1a1a1a;color:#fff}button:hover{background:#2a2a2a;border-color:#555}.sentence-table{width:100%;margin-top:25px}.row-wrap{border-bottom:1px solid #2a2a2a;padding:6px 0}.row-wrap.flip{animation:flipRow .35s ease}.row{display:grid;grid-template-columns:1fr 140px 32px;gap:12px;align-items:start;min-height:48px}.header{font-weight:700;opacity:.7;border-bottom:1px solid #444;margin-bottom:4px;padding-bottom:8px;align-items:center;min-height:unset}.col-sentence{text-align:left;min-width:0}.col-case{text-align:left;display:flex;flex-direction:column;gap:3px}.col-help{display:flex;justify-content:center;padding-top:2px}.sentence{font-size:17px;line-height:1.45;word-break:break-word;overflow-wrap:break-word;min-width:0}.case{font-weight:700;font-size:16px}.case-question{font-size:.7rem;font-weight:400;opacity:.65}.explain-btn{flex-shrink:0;background:none;border:1px solid #444;color:#666;border-radius:50%;width:20px;height:20px;font-size:12px;cursor:pointer;line-height:1;padding:0;transition:all .15s}.explain-btn:hover,.explain-btn.active{border-color:#999;color:#fff;background:#2a2a2a}.explanation{font-size:.8rem;color:#999;text-align:left;padding:4px 0 6px;line-height:1.5}@keyframes flipRow{0%{transform:rotateX(-90deg);opacity:0}60%{transform:rotateX(10deg);opacity:1}to{transform:rotateX(0);opacity:1}}.case-akuzativ{color:#ff6b6b}.case-dativ{color:#51cf66}.case-instrumental{color:#4dabf7}.case-lokativ{color:#ffd43b}.case-genitiv{color:#b197fc}.app-wrapper{display:flex;flex-direction:column;min-height:100vh;width:100%;align-items:center}.app-wrapper .container{flex:1}.footer{width:100%;display:flex;align-items:center;justify-content:center;gap:12px;padding:16px 20px;border-top:1px solid #2a2a2a;margin-top:40px}.footer-logo{height:28px;width:auto;opacity:.85}.footer-text{font-size:.78rem;color:#555;letter-spacing:.03em}@media(max-width:520px){.footer{gap:8px;padding:12px 16px}.footer-logo{height:22px}}@media(max-width:520px){body{padding-top:30px}.row{grid-template-columns:1fr 120px 28px;gap:8px}.sentence{font-size:14px}.case{font-size:13px}.case-question{font-size:.62rem}}