:root,[data-theme=light]{--bg-primary:linear-gradient(135deg,#8d153a,#00534e);--bg-secondary:#fff;--bg-card:#fffffffa;--bg-card-hover:#fff;--bg-input:#fff;--bg-overlay:#00000080;--text-primary:#1a1a1a;--text-secondary:#555;--text-muted:#888;--text-inverse:#fff;--border-color:#e0e0e0;--border-light:#00000014;--shadow-sm:0 2px 4px #00000014;--shadow-md:0 4px 12px #0000001f;--shadow-lg:0 8px 24px #00000029;--accent-primary:#8d153a;--accent-secondary:#00534e;--accent-gold:#ffbe29;--accent-orange:#eb7400;--success:#4caf50;--error:#f44336;--warning:#ff9800;--info:#2196f3}[data-theme=dark]{--bg-primary:linear-gradient(135deg,#0a0a0f,#1a1a2e);--bg-secondary:#121218;--bg-card:#1e1e2a;--bg-card-hover:#2a2a3a;--bg-input:#252532;--bg-overlay:#000c;--text-primary:#fff;--text-secondary:silver;--text-muted:#888;--text-inverse:#0a0a0f;--border-color:#3a3a4a;--border-light:#ffffff14;--shadow-sm:0 2px 4px #0006;--shadow-md:0 4px 12px #00000080;--shadow-lg:0 8px 24px #0009;--accent-primary:#ff4d6d;--accent-secondary:#00d9b5;--accent-gold:gold;--accent-orange:#ff8c00;--success:#00e676;--error:#ff5252;--warning:#ffab40;--info:#40c4ff}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-primary);color:var(--text-primary);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;min-height:100vh;transition:background .3s ease,color .3s ease}.header{background:var(--bg-card);box-shadow:var(--shadow-md);justify-content:center;transition:background .3s 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.grade-progress{background:#fff3;color:#fff}.grade-expand-icon{color:var(--text-muted);font-size:.7rem;transition:transform .2s ease}.grade-header.active .grade-expand-icon,.grade-header.expanded .grade-expand-icon{color:#fff}.grade-header.locked{background:var(--border-color);cursor:not-allowed;opacity:.7}.grade-header.locked:hover{background:var(--border-color);opacity:.8}.grade-header.locked .grade-number{background:#bbb;color:var(--text-secondary);font-size:.8rem}.grade-header.locked .grade-label{color:var(--text-muted)}.grade-sections{animation:accordionExpand .2s ease;background:var(--bg-card);border-radius:0 0 10px 10px;margin-bottom:4px;padding:8px}@keyframes accordionExpand{0%{max-height:0;opacity:0}to{max-height:1000px;opacity:1}}.section-item{align-items:center;border-radius:8px;cursor:pointer;display:flex;gap:10px;padding:10px 12px;transition:all .2s ease}.section-item:hover{background:var(--bg-card-hover)}.section-item.completed{background:#e8f5e9}.section-item.completed:hover{background:#c8e6c9}.translator-nav-btn{align-items:center;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:12px;color:#fff;cursor:pointer;display:flex;font-weight:600;gap:10px;margin:12px 10px;padding:14px 16px;transition:all .3s ease}.translator-nav-btn:hover{box-shadow:0 6px 20px #667eea66;transform:translateY(-2px)}.translator-nav-btn.active{background:linear-gradient(135deg,#5a67d8,#6b46c1);box-shadow:0 4px 15px #667eea80}.translator-nav-btn.dictionary-btn{background:linear-gradient(135deg,#11998e,#38ef7d)}.translator-nav-btn.dictionary-btn:hover{box-shadow:0 6px 20px #11998e66}.translator-nav-btn.dictionary-btn.active{background:linear-gradient(135deg,#0d7d74,#2bc866);box-shadow:0 4px 15px 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p{color:var(--text-secondary);font-size:.85rem;margin:0}.locked-close{background:none;border:none;color:#999;cursor:pointer;font-size:1.3rem;line-height:1;padding:0}.locked-close:hover{color:var(--text-primary)}.section-checkbox{align-items:center;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:6px;color:#0000;cursor:pointer;display:flex;flex-shrink:0;font-size:.8rem;height:22px;justify-content:center;transition:all .2s ease;width:22px}.section-checkbox:hover{border-color:#8d153a}.section-checkbox.checked{background:#4caf50;border-color:#4caf50;color:#fff}.section-info{min-width:0}.section-label{color:var(--text-primary);display:block;font-size:.85rem;font-weight:500}.section-label-si{color:var(--text-muted);display:block;font-size:.75rem;margin-top:1px}.section-arrow{color:#ccc;font-size:.9rem;transition:all .2s ease}.section-item:hover .section-arrow{color:#8d153a;transform:translateX(3px)}.grade-header.focused,.grade-header:focus{outline:2px solid 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#0000004d;transform:scale(1.05)}.share-icon{font-size:1rem}.share-backdrop{bottom:0;left:0;position:fixed;right:0;top:0;z-index:999}.share-dropdown{background:var(--bg-secondary);border:2px solid #00534e;border-radius:12px;box-shadow:0 10px 30px #0003;min-width:160px;padding:8px;position:absolute;right:0;top:45px;z-index:1000}.share-option{font-size:.9rem;gap:10px;transition:background .2s ease}.share-option:hover{background:#f0f0f0}.share-option span:first-child{font-size:1.1rem}.sound-controls{position:relative;z-index:1000}.sound-toggle-btn{align-items:center;background:linear-gradient(45deg,#ffbe29,#eb7400);border:none;border-radius:50%;box-shadow:0 2px 8px #0003;cursor:pointer;display:flex;font-size:1.2rem;height:40px;justify-content:center;transition:all .3s ease;width:40px}.sound-toggle-btn:hover{box-shadow:0 4px 12px #0000004d;transform:scale(1.1)}.sound-panel{background:var(--bg-secondary);border:2px solid #ffbe29;border-radius:15px;box-shadow:0 10px 30px #0003;min-width:250px;padding:20px;position:absolute;right:0;top:50px}.sound-panel h4{color:#8d153a;margin:0 0 15px;text-align:center}.sound-setting{margin-bottom:15px}.sound-setting label{color:var(--text-primary);display:block;font-size:.9rem;font-weight:700;margin-bottom:5px}.sound-setting input[type=range]{margin-bottom:5px;width:100%}.sound-setting select{border:1px solid var(--border-color);border-radius:5px;font-size:.9rem;padding:5px;width:100%}.sound-info{background:var(--bg-card);border-radius:8px;font-size:.8rem;margin:15px 0;padding:10px}.sound-info p{color:var(--text-secondary);margin:2px 0}.sound-tests{display:flex;gap:10px;margin:15px 0}.test-btn{background:linear-gradient(45deg,#00534e,#ffbe29);border:none;border-radius:8px;color:#fff;cursor:pointer;flex:1 1;font-size:.8rem;padding:8px 12px;transition:all .3s ease}.test-btn:hover{box-shadow:0 4px 12px #0003;transform:translateY(-2px)}.close-btn{background:none;border:none;color:#999;cursor:pointer;font-size:1.2rem;padding:5px;position:absolute;right:10px;top:5px}.close-btn:hover{color:var(--text-primary)}.sound-controls-warning{background:#f8d7da;border-radius:8px;box-shadow:0 4px 15px #0000001a;color:#721c24;font-size:.8rem;padding:8px 12px;position:relative;white-space:nowrap}.navigation{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:30px}.nav-btn{background:#ffffffe6;border:none;border-radius:25px;box-shadow:0 3px 10px #0000001a;cursor:pointer;font-size:.9rem;font-weight:700;padding:10px 15px;transition:all .3s ease}.nav-btn.active,.nav-btn:hover{background:linear-gradient(45deg,#eb7400,#00534e);box-shadow:0 8px 20px #0003;color:#fff;transform:translateY(-2px)}.section{background:#fffffff2;border-radius:20px;box-shadow:0 10px 30px #0000001a;display:block;margin-bottom:30px;padding:30px}.section.active{animation:fadeIn .5s ease;display:block}.section h2{color:var(--text-primary);font-size:2rem;margin-bottom:25px;text-align:center}.alphabet-grid{grid-gap:15px;display:grid;gap:15px;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));margin-bottom:30px}.letter-card{background:linear-gradient(135deg,#eb7400,#8d153a);border-radius:15px;box-shadow:0 5px 15px #0000001a;cursor:pointer;padding:20px;position:relative;text-align:center;transition:all .3s ease}.letter-card:hover{box-shadow:0 15px 35px #0003;transform:translateY(-5px) scale(1.05)}.letter-card.playing{animation:pulse 1.5s ease-in-out;transform:scale(1.1)}.letter-card .sound-indicator{animation:bounce .5s ease-in-out infinite alternate;font-size:1.2rem;position:absolute;right:5px;top:5px}.sinhala-letter{color:#fff;font-size:2.5rem;font-weight:700;margin-bottom:5px}.roman-letter{color:#ffffffe6;font-size:1.2rem;font-weight:700}.word-grid{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));margin-bottom:30px}.word-card{background:linear-gradient(135deg,#00534e,#ffbe29);border-radius:15px;box-shadow:0 5px 15px #0000001a;color:#fff;cursor:pointer;padding:25px;position:relative;text-align:center;transition:all .3s ease}.word-card:hover{box-shadow:0 15px 35px #0003;transform:translateY(-3px)}.word-card.playing{animation:pulse 2s ease-in-out;transform:scale(1.05)}.word-card .sound-indicator{animation:bounce .6s ease-in-out infinite alternate;font-size:1.5rem;position:absolute;right:10px;top:10px}.word-image{font-size:3rem;line-height:1;margin-bottom:8px}.word-card.has-image{padding-top:15px}.word-sinhala{font-size:2rem;font-weight:700;margin-bottom:10px}.word-english{font-size:1.2rem;margin-bottom:5px;opacity:.9}.word-pronunciation{font-size:1rem;font-style:italic;opacity:.8}.progress-bar{background:#e9ecef;border-radius:10px;height:20px;margin:20px 0;overflow:hidden}.progress-fill{background:linear-gradient(45deg,#ffbe29,#eb7400);border-radius:10px;height:100%;transition:width .5s ease}.quiz-container{text-align:center}.quiz-question{background:linear-gradient(135deg,#ffbe29,#eb7400);border-radius:15px;color:#fff;font-size:1.5rem;margin-bottom:25px;padding:30px}.quiz-options{grid-gap:15px;display:grid;gap:15px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:25px}.quiz-option{background:var(--bg-card);border:2px solid #dee2e6;border-radius:10px;cursor:pointer;font-size:1.1rem;padding:15px;transition:all .3s ease}.quiz-option:hover{background:#e9ecef;border-color:#eb7400}.quiz-option.correct{background:#d4edda;border-color:#28a745;color:#155724}.quiz-option.incorrect{background:#f8d7da;border-color:#dc3545;color:#721c24}.quiz-result{border-radius:10px;font-size:1.2rem;font-weight:700;margin-top:20px;padding:15px}.quiz-result.correct{background:#d4edda;color:#155724}.quiz-result.incorrect{background:#f8d7da;color:#721c24}.activity-card,.game-card,.poem-card,.story-card{background:linear-gradient(135deg,#ffbe29,#00534e);border-radius:15px;cursor:pointer;margin-bottom:20px;padding:25px;transition:all .3s ease}.activity-card:hover,.game-card:hover{box-shadow:0 10px 25px #00000026;transform:translateY(-3px)}.activity-card h3,.game-card h3,.poem-card h3,.story-card h3{color:#fff;font-size:1.5rem;margin-bottom:15px;text-align:center}.sentence-sinhala{color:var(--text-primary);font-size:1.8rem;font-weight:700;margin-bottom:10px}.sentence-english{color:var(--text-secondary);font-size:1.2rem;margin-bottom:5px}@media (max-width:768px){.container{padding:10px}.logo{font-size:2rem}.alphabet-grid,.word-grid{grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}.share-btn{font-size:.8rem;padding:6px 12px}.share-label{display:none}.share-dropdown{min-width:150px;right:-50px}}.grammar-box{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:15px;color:#fff;margin-bottom:20px;padding:25px}.grammar-box h4{color:#fff;font-size:1.3rem;margin-bottom:15px}.grammar-box p{line-height:1.6;margin-bottom:10px}.grammar-box strong{background:#fff3;border-radius:4px;padding:2px 6px}.reading-passage{background:var(--bg-card);border-left:5px solid #667eea;border-radius:15px;margin-bottom:20px;padding:25px}.reading-passage h3{margin-bottom:20px;text-align:center}.reading-passage h3,.reading-sinhala{color:var(--text-primary);font-size:1.4rem}.reading-sinhala{font-weight:500;line-height:1.8;margin-bottom:15px}.reading-english{color:var(--text-secondary);font-size:1.1rem;font-style:italic;line-height:1.6}.read-aloud-btn{align-items:center;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:25px;box-shadow:0 4px 15px #667eea4d;color:#fff;cursor:pointer;display:inline-flex;font-size:.95rem;gap:8px;margin-top:15px;padding:10px 20px;transition:all .3s ease}.read-aloud-btn:hover{box-shadow:0 6px 20px #667eea66;transform:translateY(-2px)}.read-aloud-btn.playing{animation:pulse 1s infinite;background:linear-gradient(135deg,#f44336,#d32f2f)}.read-aloud-icon{font-size:1.2rem}.read-aloud-text{font-weight:600}.read-aloud-text-si{font-size:.85rem;margin-left:4px;opacity:.9}.reading-passage .read-aloud-btn{display:flex;margin:15px auto 0}.sentence-practice{background:linear-gradient(135deg,#a8edea,#fed6e3);border-radius:15px;margin-bottom:20px;padding:25px}.sentence-pronunciation{color:var(--text-muted);font-size:1rem;font-style:italic;margin-top:5px}.culture-card{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:15px;color:#fff;margin-bottom:20px;padding:25px}.culture-card h3{color:#fff;font-size:1.5rem;margin-bottom:15px}.culture-card p{line-height:1.6;margin-bottom:10px}.culture-card strong{background:#fff3;border-radius:4px;padding:2px 6px}.story-card{background:linear-gradient(135deg,#ff9a9e,#fecfef);border-radius:15px;color:var(--text-primary);margin-bottom:20px;padding:25px}.story-card h3{color:#8b4513;font-size:1.5rem;margin-bottom:15px;text-align:center}.game-card{background:linear-gradient(135deg,#a8edea,#fed6e3);border-radius:15px;margin-bottom:20px;padding:25px}.game-card:hover{box-shadow:0 10px 25px #00000026;transform:translateY(-3px)}.poem-card{background:linear-gradient(135deg,#ffecd2,#fcb69f);border-radius:15px;margin-bottom:20px;padding:25px;text-align:center}.poem-card h3{color:#8b4513;font-size:1.5rem;margin-bottom:15px}.poem-card .sentence-sinhala{font-size:1.6rem;line-height:1.8;margin-bottom:15px;text-align:center}.poem-card .sentence-english{color:var(--text-secondary);font-size:1.1rem;font-style:italic;text-align:center}.activity-card{background:linear-gradient(135deg,#ffecd2,#fcb69f);border:2px solid #0000;border-radius:15px;margin-bottom:20px;padding:25px;transition:all .3s ease}.activity-card:hover{border-color:#f4a261;box-shadow:0 10px 25px #00000026;transform:translateY(-3px)}.activity-card h3{color:#8b4513;font-size:1.5rem;margin-bottom:15px;text-align:center}.activity-card p{line-height:1.6;margin-bottom:10px}.activity-card strong{background:#8b45131a;border-radius:4px;color:#8b4513;padding:2px 6px}.conversation-pair{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}.conversation-question{align-self:flex-start;background:linear-gradient(135deg,#4facfe,#00f2fe);border-radius:15px 15px 5px 15px;color:#fff;max-width:80%;padding:15px}.conversation-answer{align-self:flex-end;border-radius:15px 15px 15px 5px;max-width:80%;padding:15px}.conversation-answer,.project-card{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.project-card{border-radius:15px;margin-bottom:25px;padding:30px;transition:all .3s ease}.project-card:hover{box-shadow:0 15px 35px #0003;transform:translateY(-5px)}.project-card h3{font-size:1.6rem;margin-bottom:20px;text-align:center}.project-card ul{list-style-type:none;padding-left:0}.project-card li{margin-bottom:8px;padding-left:20px;position:relative}.project-card li:before{color:#a8edea;content:"✓";font-weight:700;left:0;position:absolute}.literature-quote{background:linear-gradient(135deg,#f093fb,#f5576c);border-radius:15px;color:#fff;font-style:italic;margin-bottom:20px;padding:25px;position:relative;text-align:center}.literature-quote:before{content:"\201C";font-size:4rem;left:20px;opacity:.3;position:absolute;top:-10px}.literature-quote:after{bottom:-30px;content:"\201D";font-size:4rem;opacity:.3;position:absolute;right:20px}.vocab-category-advanced{background:linear-gradient(135deg,#eb7400,#8d153a);border-radius:15px;color:#fff;cursor:pointer;margin-bottom:20px;padding:20px;transition:all .3s ease}.vocab-category-advanced:hover{box-shadow:0 10px 25px #00000026;transform:translateY(-3px)}.skill-progress{background:#e9ecef;border-radius:10px;height:10px;margin:10px 0;overflow:hidden}.skill-progress-fill{background:linear-gradient(45deg,#ffbe29,#eb7400);border-radius:10px;height:100%;transition:width .5s ease}@media 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