:root{--primary:#0fa3ad;--primary-dark:#0b7c85;--secondary:#6fbf3f;--accent:#f7c331;--success:#6fbf3f;--error:#e84a5f;--info:#3a99d9;--bg:#effbf9;--surface:#f7fdfc;--text:#2d3436;--muted:#5f6a6a;--border:#d0e8e6;--shadow:0 4px 12px #00000014;--radius:18px;--font:"Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;--text-scale:1;font-size:calc(16px * var(--text-scale));line-height:1.5;font-family:var(--font);color:var(--text);background:var(--bg);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{min-height:100vh;color:var(--text);background:linear-gradient(135deg,#e0f7fa 0%,#f1f8e9 50%,#fff8e1 100%) fixed;margin:0}#app{background:var(--surface);width:100%;max-width:900px;min-height:100vh;box-shadow:0 0 40px #00000014, var(--shadow);border-radius:0 0 24px 24px;margin:0 auto;padding:20px}body.high-contrast{--primary:#0ff;--primary-dark:#0ff;--secondary:#f0f;--accent:#ff0;--success:#0f0;--error:red;--info:#0ff;--bg:#000;--surface:#000;--text:#fff;--muted:#ccc;--border:#fff;--shadow:none;background:#000}body.high-contrast #app{border:2px solid var(--border)}body.dark-mode{--primary:#4dd0e1;--primary-dark:#26c6da;--secondary:#8bd46a;--accent:#ffd54f;--success:#8bd46a;--error:#ff6b81;--info:#6ac8fa;--bg:#1a2525;--surface:#223030;--text:#e4f0f0;--muted:#9cb0b0;--border:#3a4f4f;--shadow:0 4px 12px #00000040;background:linear-gradient(135deg,#0d1f1f 0%,#1a2525 50%,#23302f 100%) fixed}body.dark-mode .home-hero{background:linear-gradient(135deg,#0d6b73 0%,#1565c0 25%,#c2185b 50%,#f57f17 75%,#558b2f 100%)}body.reduced-motion *{scroll-behavior:auto!important;transition:none!important;animation:none!important}h1,h2,h3{color:var(--text);margin:0 0 12px;line-height:1.2}h1{font-size:2.2rem}h2{font-size:1.6rem}h3{font-size:1.2rem}p{color:var(--muted);margin:0 0 12px}.btn{border-radius:var(--radius);background:var(--primary);color:#fff;min-height:56px;font-family:var(--font);cursor:pointer;touch-action:manipulation;border:2px solid #0000;justify-content:center;align-items:center;padding:12px 24px;font-size:1.1rem;font-weight:600;transition:transform .12s,box-shadow .12s,background-color .12s;display:inline-flex}.btn:hover:not(:disabled),.btn:focus-visible{background:var(--primary-dark);box-shadow:var(--shadow);outline:3px solid var(--accent);outline-offset:2px}.btn:active:not(:disabled){transform:translateY(1px)}.btn-secondary{background:linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);color:var(--text);border-color:var(--border)}.btn-secondary:hover:not(:disabled),.btn-secondary:focus-visible{background:var(--surface);filter:brightness(.97);box-shadow:0 6px 18px #00000014}.btn-ghost{color:#fff;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#ffffff26;border-color:#fff6}.btn-home{z-index:2;background:var(--primary);border-color:var(--primary);-webkit-backdrop-filter:none;backdrop-filter:none;min-height:40px;padding:8px 14px;font-size:.95rem;position:absolute;top:12px;left:12px;color:#fff!important}.btn-ghost:hover:not(:disabled),.btn-ghost:focus-visible{background:#ffffff47;border-color:#fff9}.btn-large{width:100%;max-width:320px;min-height:72px;font-size:1.3rem}.screen-header{text-align:center;margin-bottom:24px;padding-top:12px;position:relative}.screen-header h1{margin-bottom:6px}.screen-header p{color:var(--muted);font-size:1.1rem}.home-hero{color:#fff;text-align:center;background:linear-gradient(135deg,#0fa3ad 0%,#2196f3 25%,#f06292 50%,#ffc84d 75%,#7bc142 100%);border-radius:0 0 32px 32px;margin:-20px -20px 28px;padding:36px 20px 28px;position:relative;overflow:hidden;box-shadow:0 10px 30px #0000001f}.home-hero .screen-header{margin-bottom:18px}.home-hero .screen-header h1,.home-hero .screen-header p{color:#fff}.home-hero .screen-header h1{text-shadow:0 2px 12px #0006;font-size:2.8rem}.home-hero .screen-header p{opacity:.98;text-shadow:0 1px 8px #00000059;font-size:1.25rem}.hero-icon{color:#fff;background:#ffffff2e;border:3px solid #ffffff59;border-radius:50%;justify-content:center;align-items:center;width:86px;height:86px;margin:0 auto 18px;font-size:2.6rem;display:flex;box-shadow:0 6px 20px #0000001f}.hero-logo{object-fit:contain;filter:drop-shadow(0 6px 12px #00000026);width:auto;max-width:170px;max-height:140px;margin:0 auto 18px;display:block}.home-stats{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:28px;display:grid}.home-nav{grid-template-columns:repeat(2,1fr);gap:14px;margin-bottom:24px;display:grid}.nav-tile{--tile-color:var(--primary);text-align:left;min-height:118px;font-family:var(--font);border:2px solid var(--border);border-bottom:5px solid color-mix(in srgb, var(--tile-color) 60%, var(--border));background:linear-gradient(150deg, color-mix(in srgb, var(--tile-color) 16%, var(--surface)) 0%, var(--surface) 100%);box-shadow:0 6px 18px color-mix(in srgb, var(--tile-color) 14%, transparent);cursor:pointer;touch-action:manipulation;border-radius:20px;flex-direction:column;justify-content:center;align-items:flex-start;gap:10px;padding:18px;transition:transform .15s,box-shadow .15s,border-color .15s;display:flex}.nav-tile:hover,.nav-tile:focus-visible{box-shadow:0 14px 30px color-mix(in srgb, var(--tile-color) 26%, transparent);outline:3px solid var(--accent);outline-offset:2px;transform:translateY(-5px)}.nav-tile:active{transform:translateY(-1px)}.nav-tile.tile-wide{flex-direction:row;grid-column:span 2;align-items:center;gap:16px;min-height:96px}.nav-tile-icon{color:#fff;background:linear-gradient(135deg, var(--tile-color) 0%, color-mix(in srgb, var(--tile-color) 70%, #000) 100%);width:46px;height:46px;box-shadow:0 4px 10px color-mix(in srgb, var(--tile-color) 35%, transparent);border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;font-size:1.4rem;display:flex;overflow:hidden}.nav-tile-icon-img{object-fit:contain;filter:drop-shadow(0 1px 2px #00000026);width:85%;height:85%}.nav-tile-text{flex-direction:column;gap:2px;min-width:0;display:flex}.nav-tile-title{color:var(--text);font-size:1.15rem;font-weight:800;line-height:1.2}.nav-tile-sub{color:var(--muted);font-size:.88rem;line-height:1.2}.tile-play{--tile-color:#0fa3ad}.tile-character{--tile-color:#f06292}.tile-treasure{--tile-color:#f7c331}.tile-progress{--tile-color:#7bc142}.tile-switch{--tile-color:#2196f3}.tile-settings{--tile-color:#9b59b6}.tile-dev{--tile-color:#e67e22}.tile-play .nav-tile-title{font-size:1.5rem}@media (width<=420px){.home-nav{grid-template-columns:1fr}.nav-tile.tile-wide{grid-column:span 1}}.banner-stats{flex-wrap:wrap;gap:8px;margin-left:auto;display:flex}.stat-chip{background:var(--surface);border:2px solid var(--border);color:var(--text);white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:7px 12px;font-size:.95rem;font-weight:700;display:inline-flex}.chip-icon{font-size:.95rem;line-height:1}.chip-xp{border-color:color-mix(in srgb, var(--primary) 45%, var(--border));color:var(--primary-dark)}.chip-coin{border-color:color-mix(in srgb, var(--accent) 55%, var(--border));color:#b8860b}.chip-correct{border-color:color-mix(in srgb, var(--success) 45%, var(--border));color:var(--success)}body.dark-mode .chip-coin{color:var(--accent)}.stat-row{background:linear-gradient(135deg, var(--bg) 0%, var(--surface) 100%);border-radius:var(--radius);border:1px solid var(--border);border-left:6px solid var(--primary);box-shadow:var(--shadow);justify-content:space-between;align-items:center;padding:18px 20px;display:flex}.stat-label{color:var(--muted);font-size:1rem;font-weight:600}.stat-value{color:var(--primary-dark);font-size:1.3rem;font-weight:800}body.high-contrast .stat-value{color:var(--primary)}.subject-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin-bottom:24px;display:grid}@media (width>=600px){h1{font-size:2.8rem}h2{font-size:2rem}}.subject-card{--subject-color:var(--primary);text-align:left;border:2px solid var(--border);border-bottom:5px solid color-mix(in srgb, var(--subject-color) 60%, var(--border));background:linear-gradient(150deg, color-mix(in srgb, var(--subject-color) 14%, var(--surface)) 0%, var(--surface) 100%);width:100%;box-shadow:0 6px 18px color-mix(in srgb, var(--subject-color) 14%, transparent);cursor:pointer;touch-action:manipulation;border-radius:20px;flex-direction:column;align-items:flex-start;padding:20px;transition:transform .15s,box-shadow .15s,background-color .15s;display:flex}.subject-card:hover,.subject-card:focus-visible{box-shadow:0 14px 32px color-mix(in srgb, var(--subject-color) 26%, transparent);outline:3px solid var(--accent);outline-offset:2px;transform:translateY(-5px)}.lesson-card{text-align:left;border:2px solid var(--border);border-left-width:8px;border-left-color:var(--primary);background:linear-gradient(150deg, var(--surface) 0%, var(--bg) 100%);width:100%;box-shadow:var(--shadow);cursor:pointer;touch-action:manipulation;border-radius:18px;flex-direction:row;justify-content:space-between;align-items:center;padding:18px 20px;transition:transform .15s,box-shadow .15s,background-color .15s,border-color .15s;display:flex}.lesson-card:hover,.lesson-card:focus-visible{outline:3px solid var(--accent);outline-offset:2px;transform:translateY(-4px);box-shadow:0 12px 28px #0000001f}.lesson-card.completed{border-left-color:var(--success);background:linear-gradient(135deg, color-mix(in srgb, var(--success) 8%, var(--surface)) 0%, var(--surface) 100%)}.icon-badge{color:#fff;border:2px solid #ffffff40;border-radius:14px;justify-content:center;align-items:center;width:50px;height:50px;margin-bottom:12px;font-size:1.3rem;font-weight:800;display:flex;box-shadow:0 4px 10px #00000026}.card-title{color:var(--text);margin:0 0 6px;font-size:1.35rem;font-weight:800}.card-meta{color:var(--muted);margin:0 0 10px;font-size:.95rem;line-height:1.4}.card-percent{color:var(--primary-dark);margin-top:10px;font-size:1.1rem;font-weight:800}body.high-contrast .card-percent{color:var(--primary)}.progress-track{background:var(--bg);border:1px solid var(--border);border-radius:999px;width:100%;height:10px;overflow:hidden}.progress-fill{background:var(--success);border-radius:999px;height:100%;transition:width .25s}.lesson-list{flex-direction:column;gap:12px;margin-bottom:24px;display:flex}.lesson-status{color:var(--primary);white-space:nowrap;background:color-mix(in srgb, var(--primary) 10%, var(--surface));border:1px solid color-mix(in srgb, var(--primary) 25%, var(--border));border-radius:999px;margin-left:16px;padding:8px 14px;font-weight:700}.lesson-status.completed{color:var(--success);background:color-mix(in srgb, var(--success) 10%, var(--surface));border-color:color-mix(in srgb, var(--success) 25%, var(--border))}.lesson-status.locked{color:var(--muted);background:var(--bg);border-color:var(--border)}.lesson-card.locked{border-left-color:var(--muted);background:linear-gradient(135deg, var(--bg) 0%, var(--surface) 100%);cursor:not-allowed}.lesson-card:disabled:hover,.lesson-card:disabled:focus-visible{box-shadow:none;outline:none;transform:none}.top-bar{background:linear-gradient(135deg, var(--bg) 0%, var(--surface) 100%);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:24px;padding:74px 16px 14px;display:flex;position:relative}.top-bar .btn-home{min-height:36px;padding:6px 12px;font-size:.9rem;top:16px;left:16px}.top-bar-info{flex:1;min-width:0}.top-bar-info h2{word-break:break-word}.top-bar-stats{flex-shrink:0;margin-left:auto}.top-bar-info h2{margin:0;font-size:1.25rem}.top-bar-subtitle{color:var(--muted);margin:0;font-size:.95rem}.top-bar-stats{color:var(--primary-dark);gap:14px;font-size:.95rem;font-weight:700;display:flex}.top-progress{width:100%;margin-top:4px}.prompt{text-align:center;color:var(--text);margin-bottom:24px;font-size:1.55rem;font-weight:700}.prompt-image{border-radius:var(--radius);object-fit:contain;border:3px solid var(--border);background:var(--bg);width:100%;max-width:240px;max-height:240px;margin:0 auto 24px;padding:8px;display:block}.activity-area{margin-bottom:16px}.choices-grid{gap:14px;margin-bottom:12px;display:grid}.picture-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}.text-grid{grid-template-columns:1fr;justify-items:stretch;max-width:560px;margin-left:auto;margin-right:auto}@media (width>=500px){.text-grid{grid-template-columns:1fr}}.choice-card{border:3px solid var(--border);border-top-width:7px;border-top-color:var(--primary);border-radius:var(--radius);background:linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);cursor:pointer;touch-action:manipulation;flex-direction:column;justify-content:flex-start;align-items:center;width:100%;min-height:180px;padding:14px;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex;overflow:hidden}.choice-card:hover:not(:disabled),.choice-card:focus-visible:not(:disabled){box-shadow:0 10px 24px color-mix(in srgb, var(--primary) 18%, transparent);outline:3px solid var(--accent);outline-offset:2px;transform:translateY(-4px)}.choice-card img{object-fit:contain;background:linear-gradient(135deg,#e8eef5 0%,#d9e3ef 100%);border-radius:14px;flex:1;width:100%;max-height:120px;margin-bottom:10px;padding:8px}body.dark-mode .choice-card img{background:linear-gradient(135deg,#1c2030 0%,#23283c 100%)}.choice-label{text-align:center;color:var(--text);font-size:1.1rem;font-weight:700}.choice-button{border:3px solid var(--border);border-radius:var(--radius);background:linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);width:100%;min-height:68px;color:var(--text);font-family:var(--font);text-align:left;cursor:pointer;touch-action:manipulation;border-left-width:6px;align-items:center;gap:14px;padding:14px 20px;font-size:1.1rem;font-weight:700;transition:transform .15s,border-color .15s,box-shadow .15s,background-color .15s;display:flex}.choice-button:hover:not(:disabled),.choice-button:focus-visible:not(:disabled){border-color:var(--primary);box-shadow:0 8px 22px color-mix(in srgb, var(--primary) 18%, transparent);outline:3px solid var(--accent);outline-offset:2px;transform:translateY(-3px)}.choice-letter{background:linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:1rem;font-weight:800;display:flex;box-shadow:0 2px 6px #0000001f}.choice-button .choice-label{text-align:left}.choice-card.correct,.choice-button.correct{border-color:var(--success);background:#e8f8ef}.choice-card.incorrect,.choice-button.incorrect{border-color:var(--error);background:#fdecea}.choice-button.correct .choice-letter{background:var(--success)}.choice-button.incorrect .choice-letter{background:var(--error)}.choice-card.selected,.choice-button.selected{box-shadow:var(--shadow);transform:scale(1.02)}body.high-contrast .choice-card.correct,body.high-contrast .choice-button.correct,body.high-contrast .choice-card.incorrect,body.high-contrast .choice-button.incorrect{background:#000;border-width:5px}.feedback-slot{margin-top:10px}.feedback{border-radius:var(--radius);border:2px solid var(--border);background:var(--bg);text-align:center;box-shadow:var(--shadow);border-left-width:8px;padding:22px}.feedback h3{margin:0 0 10px;font-size:1.5rem;font-weight:800}.feedback p{color:var(--text);margin:0 0 18px;font-size:1.05rem;line-height:1.5}.feedback-correct{border-color:var(--success);background:#e8f8ef}.feedback-correct h3{color:var(--success)}.feedback-incorrect{border-color:var(--error);background:#fdecea}.feedback-incorrect h3{color:var(--error)}.feedback-info{border-color:var(--info);background:#eaf2f8}.feedback-info h3{color:var(--info)}body.dark-mode .choice-card.correct,body.dark-mode .choice-button.correct{background:#143326}body.dark-mode .choice-card.incorrect,body.dark-mode .choice-button.incorrect{background:#3a1c1c}body.dark-mode .feedback-correct{background:#143326}body.dark-mode .feedback-incorrect{background:#3a1c1c}body.dark-mode .feedback-info{background:#1a2d3a}.feedback-actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.hint-text{color:var(--muted);margin-top:12px;font-style:italic}.sequence-wrap,.sorting-wrap{flex-direction:column;gap:14px;display:flex}.sequence-instruction,.sorting-instruction{text-align:center;color:var(--muted);margin-bottom:4px}.sequence-label,.sorting-label{color:var(--text);margin:0 0 6px;font-size:1.1rem}.sequence-available,.sequence-strip,.sorting-items{border:2px dashed var(--border);border-radius:var(--radius);flex-wrap:wrap;justify-content:center;gap:10px;min-height:80px;padding:12px;display:flex}.sequence-actions,.sorting-actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.sequence-card,.sorting-card{max-width:160px;min-height:80px;padding:10px}.sequence-card img,.sorting-card img{flex:none;max-height:60px}.sequence-number{background:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;margin-bottom:6px;font-size:.9rem;font-weight:700;display:inline-flex}.sequence-answer-card{border-color:var(--primary);background:#4facfe14}body.dark-mode .sequence-answer-card{background:#5ab9ff1a}.sorting-bins{grid-template-columns:1fr;gap:14px;display:grid}@media (width>=600px){.sorting-bins{grid-template-columns:repeat(2,1fr)}}.sorting-bin{border:2px solid var(--border);border-radius:var(--radius);background:var(--bg);min-height:140px;padding:12px}.sorting-bin-title{border:2px dashed var(--border);border-radius:var(--radius);background:var(--surface);width:100%;color:var(--text);font-family:var(--font);cursor:pointer;touch-action:manipulation;margin-bottom:10px;padding:10px;font-size:1.1rem;font-weight:700;transition:background-color .12s,border-color .12s}.sorting-bin-title:hover,.sorting-bin-title:focus-visible{background:var(--primary);color:#fff;border-color:var(--primary);outline:3px solid var(--accent);outline-offset:2px}.sorting-bin-cards{flex-wrap:wrap;justify-content:center;gap:8px;min-height:60px;display:flex}.sorting-card.selected{border-color:var(--primary);box-shadow:var(--shadow);background:#4facfe1f;transform:scale(1.02)}body.dark-mode .sorting-card.selected{background:#5ab9ff26}.sorting-assigned-badge{background:var(--primary);color:#fff;border-radius:999px;margin-top:6px;padding:2px 8px;font-size:.75rem;font-weight:700}.lesson-complete-title{text-align:center;color:var(--success);margin-top:50px;font-size:2.2rem}.lesson-complete-message,.lesson-complete-bonus{text-align:center;font-size:1.15rem}.lesson-complete-bonus{color:var(--success);margin-bottom:28px;font-size:1.3rem;font-weight:800}body.high-contrast .lesson-complete-bonus{color:var(--success)}.settings-form{flex-direction:column;gap:16px;max-width:520px;margin:0 auto 28px;display:flex}.toggle-row{background:linear-gradient(135deg, var(--bg) 0%, var(--surface) 100%);border:1px solid var(--border);border-left:6px solid var(--primary);border-radius:var(--radius);box-shadow:var(--shadow);justify-content:space-between;align-items:center;padding:18px 20px;display:flex}.toggle-label{font-size:1.05rem;font-weight:700}.toggle{border:2px solid var(--border);min-width:78px;min-height:40px;font-family:var(--font);cursor:pointer;border-radius:999px;padding:8px 16px;font-weight:800;transition:background-color .15s,color .15s,transform .15s,box-shadow .15s}.toggle:hover:not(:disabled),.toggle:focus-visible{transform:translateY(-2px);box-shadow:0 4px 12px #00000014}.toggle.on{background:linear-gradient(135deg, var(--success) 0%, #2abb66 100%);color:#fff;border-color:var(--success)}.toggle.off{background:var(--surface);color:var(--muted)}.settings-slider{width:100%;margin-bottom:18px}.profile-stats{flex-direction:column;gap:10px;max-width:520px;margin:0 auto 24px;display:flex}.achievement-list{grid-template-columns:1fr;gap:12px;margin-bottom:24px;display:grid}@media (width>=600px){.achievement-list{grid-template-columns:repeat(2,1fr)}}.achievement-badge{border:2px solid var(--border);border-radius:var(--radius);background:linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);box-shadow:var(--shadow);border-left-width:8px;padding:18px}.achievement-badge h4{margin:0 0 6px;font-size:1.15rem;font-weight:800}.achievement-badge p{color:var(--muted);margin:0;font-size:.95rem}.achievement-badge.locked{opacity:.55;border-left-color:var(--border)}.achievement-badge.unlocked{border-left-color:var(--success);background:linear-gradient(135deg, color-mix(in srgb, var(--success) 8%, var(--surface)) 0%, var(--surface) 100%)}body.dark-mode .achievement-badge.unlocked{background:linear-gradient(135deg, #143326 0%, var(--surface) 100%)}body.high-contrast .achievement-badge.unlocked{background:#000}body.high-contrast .feedback-correct,body.high-contrast .feedback-incorrect,body.high-contrast .feedback-info{color:#fff;background:#000}body.high-contrast .feedback-correct{border-color:var(--success)}body.high-contrast .feedback-incorrect{border-color:var(--error)}body.high-contrast .feedback-info{border-color:var(--info)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}#app{position:relative;overflow:hidden}.btn-primary{background:linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%)}.btn-primary:hover:not(:disabled),.btn-primary:focus-visible{filter:brightness(1.05)}.btn-accent{background:linear-gradient(135deg, var(--accent) 0%, #e6a700 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