:root{--ink:#172033;--muted:#59667a;--line:#d7e2f2;--paper:#fffdf6;--blue:#2476d9;--green:#2f8a3a;--pink:#fff2f6;--card:#f7f9fc}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:"Times New Roman",Georgia,serif;color:var(--ink);background:#fff7f9}body{display:flex;justify-content:center}.app-shell{width:min(100%,980px);min-height:100vh;background:var(--paper);padding:18px}.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:10px;padding:10px 0;background:var(--paper)}.icon-btn,.primary,.ghost,.card{font-family:inherit}.icon-btn{width:44px;height:44px;border:2px solid var(--line);border-radius:50%;background:#fff;color:var(--ink);font-size:24px;font-weight:900}.screen-title{margin:0;font-size:22px}.hero{padding:14px 0 18px}.hero h1{margin:0 0 6px;font-size:34px;line-height:1.05}.hero p{margin:0;color:var(--muted);font-size:17px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}.card{display:grid;gap:8px;align-content:center;width:100%;min-height:112px;padding:16px;border:2px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);text-align:center;text-decoration:none}.card strong{font-size:20px;line-height:1.15;overflow-wrap:anywhere}.card span,.muted{color:var(--muted);font-size:15px}.panel{padding:16px;border:2px solid var(--line);border-radius:8px;background:#fff;margin:12px 0}.primary,.ghost{min-height:44px;padding:10px 16px;border-radius:8px;border:2px solid var(--line);background:#fff;font-weight:900;color:var(--ink)}.primary{background:#e9f3ff;border-color:#b8d7ff;color:#145ca8}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.media-img{max-width:100%;height:auto;border-radius:8px;border:1px solid var(--line);background:#fff}.audio{width:100%;max-width:520px}.sticky-audio{position:sticky;top:58px;z-index:4;background:#fffdf6;padding:8px 0}.lesson-layout{display:grid;grid-template-columns:minmax(180px,.8fr) minmax(0,2fr);gap:14px}.vocab-list{display:grid;gap:8px}.choice-row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.choice-row button{min-width:46px}.result{font-weight:900;color:var(--green)}.field{display:grid;gap:6px;margin:10px 0}.field textarea{width:100%;min-height:90px;padding:10px;border:2px solid var(--line);border-radius:8px;font-family:inherit;font-size:17px}.grammar-token{display:inline-flex;align-items:center;justify-content:center;margin:3px;padding:4px 8px;border:2px solid currentColor;border-radius:999px;font-weight:900}.grammar-token.noun{border-radius:0;clip-path:polygon(50% 0,100% 100%,0 100%);padding:14px 12px 5px;color:#111}.grammar-token.verb{color:#d33}.grammar-token.adjective{color:#2674d9}.grammar-token.pronoun{color:#7752c8}.grammar-token.preposition{color:#2f8a3a}.grammar-token.adverb{color:#e27d24}.grammar-token.conjunction{color:#d85b8a;border-radius:4px}.empty{padding:18px;border:2px dashed var(--line);border-radius:8px;color:var(--muted)}@media(max-width:720px){.app-shell{padding:14px}.lesson-layout{grid-template-columns:1fr}.hero h1{font-size:28px}.card{min-height:96px}.sticky-audio{top:54px}}