:root{--paper:#f6f1e9;--panel:#fffdfa;--ink:#25332e;--muted:#748078;--line:#e6e2d9;--green:#2f6c5b;--mint:#dce9e2;--coral:#ef6c5a;--cream:#fffaf2}*{box-sizing:border-box}html,body{height:100%;overflow:hidden}body{margin:0;min-width:320px;background:#e8e6df;color:var(--ink);font-family:DM Sans,sans-serif}button,input{font:inherit}button{cursor:pointer}.app-shell{height:100dvh;min-height:0;padding:18px;overflow:hidden}.topbar{height:58px;max-width:1520px;margin:0 auto 12px;padding:0 12px 0 4px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-family:Fraunces,serif;font-size:28px;letter-spacing:-1.4px}.brand-mark{display:grid;place-items:center;width:32px;height:32px;color:var(--cream);background:var(--ink);border-radius:10px 10px 10px 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.board-content{width:96%}.app-shell{-webkit-user-select:none;user-select:none}.board-content,.notebook-section{-webkit-user-select:text;user-select:text}.lesson-progress:empty{display:none}.speaker-icon{color:var(--green)}.history-empty{color:#7f8981;font-size:12px}.history-drawer{position:absolute;z-index:12;inset:0;display:flex;flex-direction:column;padding:25px;background:var(--panel);border-radius:0 22px 22px 0;box-shadow:-18px 0 45px #25332e18}.history-drawer-header{display:flex;align-items:flex-start;justify-content:space-between;padding-bottom:14px;border-bottom:1px solid var(--line)}.history-drawer-header h2{margin:7px 0 0;font-family:Fraunces,serif;font-size:25px;font-weight:500}.history-drawer-header button{display:grid;place-items:center;width:32px;height:32px;border:0;border-radius:9px;background:#f1eee7;color:#657168;font-size:20px}.history-drawer .history-list{max-height:none;flex:1;align-content:start;grid-auto-rows:min-content;margin-top:16px}.history-drawer .history-item{min-height:46px;padding:12px 13px;background:#fffdfa}.lesson-sources{max-height:150px;overflow:auto}.lesson-sources a{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:7px;color:#48695e;font-size:11px;text-decoration:none}.lesson-sources a span{flex:0 0 auto}.lesson-sources a:hover{text-decoration:underline}@media(max-width:720px){.history-drawer{position:fixed;z-index:30;inset:58px 0 0;border-radius:0;padding:20px}.history-drawer-header h2{font-size:22px}}