:root{--text: #6b6375;--text-h: #08060d;--bg: #fff;--border: #e5e4e7;--code-bg: #f4f3ec;--accent: #aa3bff;--accent-bg: rgba(170, 59, 255, .1);--accent-border: rgba(170, 59, 255, .5);--social-bg: rgba(244, 243, 236, .5);--shadow: rgba(0, 0, 0, .1) 0 10px 15px -3px, rgba(0, 0, 0, .05) 0 4px 6px -2px;--sans: system-ui, "Segoe UI", Roboto, sans-serif;--heading: system-ui, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media(max-width:1024px){:root{font-size:16px}}@media(prefers-color-scheme:dark){:root{--text: #9ca3af;--text-h: #f3f4f6;--bg: #16171d;--border: #2e303a;--code-bg: #1f2028;--accent: #c084fc;--accent-bg: rgba(192, 132, 252, .15);--accent-border: rgba(192, 132, 252, .5);--social-bg: rgba(47, 48, 58, .5);--shadow: rgba(0, 0, 0, .4) 0 10px 15px -3px, rgba(0, 0, 0, .25) 0 4px 6px -2px}#social .button-icon{filter:invert(1) brightness(2)}}#root{width:1126px;max-width:100%;margin:0 auto;text-align:center;border-inline:1px solid var(--border);min-height:100svh;display:flex;flex-direction:column;box-sizing:border-box}body{margin:0}h1,h2{font-family:var(--heading);font-weight:500;color:var(--text-h)}h1{font-size:56px;letter-spacing:-1.68px;margin:32px 0}@media(max-width:1024px){h1{font-size:36px;margin:20px 0}}h2{font-size:24px;line-height:118%;letter-spacing:-.24px;margin:0 0 8px}@media(max-width:1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);display:inline-flex;border-radius:4px;color:var(--text-h)}code{font-size:15px;line-height:135%;padding:4px 8px;background:var(--code-bg)}:root{--primary-color: #007bff;--secondary-color: #6c757d;--bg-color: #f8f9fa;--text-color: #212529;--highlight-color: #fff3cd;--sentence-active: #e2f3ff;--border-color: #dee2e6}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-color);color:var(--text-color);margin:0;padding:0}.container{max-width:1000px;margin:0 auto;padding:20px}.document-list{display:grid;gap:15px}.document-card{background:#fff;padding:15px;border-radius:8px;box-shadow:0 2px 4px #0000001a;cursor:pointer;transition:transform .2s}.document-card:hover{transform:translateY(-2px)}.study-view{background:#fff;padding:30px;border-radius:12px;box-shadow:0 4px 6px #0000000d;line-height:1.8;font-size:1.1rem}.sentence{display:inline;padding:2px 4px;border-radius:4px;cursor:pointer;transition:background-color .2s}.sentence.active{background-color:var(--sentence-active);outline:2px solid var(--primary-color)}.word-highlight{font-weight:700;color:var(--primary-color);border-bottom:2px solid var(--primary-color);cursor:help}.anki-controls{margin-top:30px;display:flex;gap:10px;justify-content:center}.btn{padding:10px 20px;border:none;border-radius:6px;cursor:pointer;font-weight:600;transition:opacity .2s}.btn:hover{opacity:.8}.btn-again{background-color:#ff4d4f;color:#fff}.btn-hard{background-color:#ffa940;color:#fff}.btn-good{background-color:#52c41a;color:#fff}.btn-easy{background-color:#1890ff;color:#fff}.badge{padding:4px 12px;border-radius:20px;font-size:.85rem;font-weight:700;color:#fff;white-space:nowrap}.badge-sentence{background-color:#007bff}.badge-word{background-color:#1890ff}.badge-mode{background-color:#6c757d}.error-banner{margin-bottom:16px;padding:10px 12px;border-radius:8px;background:#fff1f0;color:#a8071a;border:1px solid #ffa39e}.review-area{transition:all .3s ease}.word-study-card{margin-top:20px;min-height:220px;padding:28px;background:#fff;border-radius:12px;border:1px solid #eee;text-align:center}.word-context{margin:0 auto 24px;max-width:720px;color:#666;line-height:1.7}.word-meaning{margin-top:24px;font-size:1.5rem;font-weight:700;color:#52c41a}