:root{color-scheme:dark;--bg:#10121b;--surface:#191c29;--raised:#222635;--text:#fff;--border:#34394c;--accent:#c3b4ff;--accent-bg:#39304f;--good:#a4e3ce;--good-bg:#233e38;--bad:#ffb4b4;--bad-bg:#432c35;--muted:#c3c7d8;--shadow:0 20px 60px #00000020}:root[data-theme=light]{color-scheme:light;--bg:#f3f2ef;--surface:#fff;--raised:#f3f3f8;--text:#15151d;--border:#d9dce6;--accent:#6748af;--accent-bg:#eee7fa;--good:#216750;--good-bg:#e4f3eb;--bad:#a52841;--bad-bg:#fce8ed;--muted:#55596a;--shadow:0 20px 60px #37325109}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--bg);color:var(--text);font:17px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}button,select,.file-button{cursor:pointer}button,input,select,.file-button{border:1px solid var(--border);border-radius:10px;background:var(--raised);color:var(--text);padding:10px 13px;min-height:44px}button:hover,.file-button:hover{border-color:var(--accent)}button:disabled{cursor:default;opacity:.8}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}h1,h2,p{margin:0}h2{font-size:23px}.container{width:min(1140px,100% - 40px);margin:auto}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 0;border-bottom:1px solid var(--border);flex-wrap:wrap}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:14px;font-weight:750;letter-spacing:1px}.brand small{display:block;font-size:13px;font-weight:500;letter-spacing:0}.brand-mark{background:var(--accent-bg);border-radius:12px;font-size:24px;padding:5px 9px}nav{display:flex;gap:5px;align-items:center;flex-wrap:wrap}nav a{padding:7px;font-size:14px;text-decoration:none}nav a:hover{text-decoration:underline}.donate{border:1px solid var(--border);border-radius:10px}.hero{padding:32px 0 25px}.eyebrow{font-size:11px;letter-spacing:1.8px;font-weight:700;color:var(--accent)}h1{font-size:clamp(34px,4vw,48px);letter-spacing:-1.1px;line-height:1.2;margin:8px 0 12px}.hero>p:last-child{color:var(--muted);font-size:16px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:20px;align-items:start}.panel{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:25px;box-shadow:var(--shadow);margin-bottom:18px;min-width:0}.compact{padding:18px}.compact h2{font-size:18px}.activities{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;padding:5px;border:1px solid var(--border);border-radius:15px;background:var(--surface);margin-bottom:16px}.activities button{display:flex;align-items:center;justify-content:center;gap:8px;border:0;background:transparent;font-size:15px;padding:12px 4px;font-weight:650}.activities button[aria-pressed=true]{background:var(--accent-bg)}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.exercise-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:13px}.badge{background:var(--accent-bg);padding:5px 8px;border-radius:6px;font-weight:700}.track{height:4px;background:var(--raised);border-radius:4px;margin:15px 0 25px}.track span{display:block;height:100%;background:var(--accent);width:0%;transition:width .2s}.question-label{font-size:14px;color:var(--muted)}.prompt{font-size:clamp(24px,3vw,34px);line-height:1.45;margin:13px 0;min-height:90px;overflow-wrap:anywhere;font-weight:600}.audio-button{font-size:14px;border-radius:999px;background:transparent;padding:7px 12px}.choices{display:grid;gap:9px;margin-top:23px}.choices button{text-align:left;white-space:normal;min-height:55px}.correct{border-color:var(--good)!important;background:var(--good-bg)!important}.wrong{border-color:var(--bad)!important;background:var(--bad-bg)!important}.feedback{font-weight:650;margin-top:20px;border-radius:10px;padding:12px}.full-sentence{font-size:23px;font-weight:600;line-height:1.5;margin-top:20px;overflow-wrap:anywhere}.translation{background:var(--accent-bg);border-radius:11px;padding:13px;margin-top:10px}.related{margin-top:15px;display:flex;flex-direction:column;gap:9px}.related-title{font-size:13px;color:var(--muted)}.word-link{display:flex;align-items:center;justify-content:space-between;gap:8px;border:1px solid var(--border);border-radius:10px;padding:9px;font-size:14px}.word-link a{overflow-wrap:anywhere}.word-link button{font-size:13px;padding:4px 9px;flex-shrink:0;min-height:38px}.controls{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}.primary{background:var(--accent-bg);border-color:var(--accent)}.danger{color:var(--bad)}.help{font-size:13px;color:var(--muted);margin-top:10px}.coverage{font-size:25px;font-weight:700;margin:10px 0}.settings summary{font-weight:650;cursor:pointer}.settings label{display:block;margin:16px 0;font-size:14px}.settings select{width:100%;margin-top:6px;font-size:14px}.settings label.check{display:flex;gap:8px;align-items:center}.check input{min-height:0;width:18px;height:18px}.settings>button,.settings>.file-button{display:block;width:100%;margin-top:12px;font-size:14px;text-align:center}.file-button{position:relative;display:inline-block;font-size:14px;overflow:hidden}.file-button input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}.file-button:focus-within{outline:3px solid var(--accent)}.search{width:100%;margin-top:18px}.sentence-grid{display:grid;gap:15px;margin-top:18px}.sentence-card{border:1px solid var(--border);border-radius:14px;padding:17px;overflow-wrap:anywhere}.sentence-card h3{font-size:21px;line-height:1.4;margin:0 0 7px}.sentence-card>p{font-size:16px;color:var(--muted);margin:0 0 12px}.sentence-card details{margin-top:12px;font-size:14px}.sentence-card summary{cursor:pointer}.write-row{display:flex;gap:8px;margin-top:8px}#writeForm{margin-top:22px}#writeForm label{font-size:14px}#answer{min-width:0;flex:1}.notice{position:relative;display:flex;justify-content:space-between;align-items:center;gap:14px;padding:12px 15px;background:var(--raised);border:1px solid var(--border);border-radius:12px;margin-bottom:18px;font-size:14px;overflow:hidden}.notice button{min-height:32px;font-size:22px;padding:0 8px}.notice-timer{position:absolute;bottom:0;left:0;height:3px;background:var(--accent);width:100%;transform-origin:left;animation:countdown 6s linear}.notice.persistent .notice-timer{display:none}@keyframes countdown{from{transform:scaleX(0)}to{transform:scaleX(1)}}footer{padding:30px 0;font-size:13px;color:var(--muted)}.skip{position:absolute;top:-100px;left:15px;z-index:10;background:var(--surface);padding:10px}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}@media(max-width:850px){.workspace{grid-template-columns:1fr}.workspace aside{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.workspace aside>section{grid-column:1/-1}.topbar nav{gap:1px}.topbar nav a{font-size:13px}}@media(max-width:520px){.container{width:calc(100% - 24px)}.panel{padding:20px 16px}.hero{padding:25px 0}.brand small{display:none}.topbar{gap:10px;padding:16px 0}.topbar nav{width:100%}.topbar nav a{padding:6px}.activities button{font-size:13px;gap:5px}.activities svg{width:17px;height:17px}.workspace aside{display:block}.prompt{min-height:70px}.write-row{flex-direction:column}.full-sentence{font-size:21px}.controls>button{flex:1}.word-link{align-items:flex-start}.compact{padding:16px}.hero>p:last-child{font-size:14px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}.notice-timer{animation:none}}