:root{color:var(--color-text);background-color:var(--color-background);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--content-width:1200px;--content-padding:2rem;--content-padding-half:1rem;--content-padding-quarter:.5rem;--font-family:system-ui, Avenir, Helvetica, Arial, sans-serif;--header-font-family:system-ui, Avenir, Montserrat, Corbel, "URW Gothic", source-sans-pro, sans-serif;--color-text:#0f172a;--color-text-muted:#475569;--color-background:#f1f5f9;--color-background-light:#fafcff;--color-background-dark:#e2e8f0;--color-primary:#3b82f6;--color-primary-dark:#1e40af;--color-primary-light:#93c5fd;--color-primary-rgb:37, 99, 235;--color-primary-text:#f8fafc;--color-secondary:#db2777;--color-secondary-dark:#9d174d;--color-secondary-light:#f472b6;--color-secondary-rgb:45, 147, 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main{padding-top:0!important}footer{clear:both;background:var(--color-text);color:var(--color-background-dark);border-top:solid 2px var(--color-text-muted);z-index:2;grid-area:footer;width:100%;display:block;position:relative}#footer{width:100%;max-width:var(--content-width);padding:var(--content-padding-half) 0;justify-content:space-between;align-items:center;margin:0 auto;font-size:.9rem;display:flex}#footer p{margin:0;font-size:1rem}#footer nav{gap:var(--content-padding-half);justify-content:center;align-items:center;display:flex}@media only screen and (max-width:1240px){#footer{padding:var(--content-padding-half) var(--content-padding-half)}}@media only screen and (max-width:600px){#footer{text-align:center;flex-direction:column}#footer nav{justify-content:center}#footer nav 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label{color:var(--color-error,#dc3545)}.error-message{color:var(--color-error,#dc3545);margin-top:.25rem;font-size:.875rem}input[readonly]{cursor:default;color:var(--color-text-muted,#6c757d);border-color:var(--color-text-muted)}input[readonly]:focus{border-color:var(--color-text);box-shadow:none}.btn-primary{background-color:var(--color-primary);border-color:var(--color-primary)}.btn 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textarea{min-height:120px;padding:1.5rem 1rem .25rem}.form-field-float textarea~label{top:1.4rem}.form-field-float textarea:focus~label,.form-field-float textarea:not(:placeholder-shown)~label{color:var(--color-primary);transform:translateY(-1rem)scale(.75)}.alert{border:1px solid #0000;border-radius:.25rem;margin-bottom:1rem;padding:.5rem 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transparent 50%);background-position:calc(100% - 15px) calc(1em + 2px),calc(100% - 10px) calc(1em + 2px);background-repeat:no-repeat;background-size:5px 5px,5px 5px;border-radius:.25rem;margin-bottom:1rem;font-size:1rem;font-weight:400;line-height:1.5;transition:border-color .15s ease-in-out,box-shadow .15s ease-in-out;display:block}select:focus,.form-select:focus{border-color:var(--color-primary);box-shadow:0 0 0 .2rem rgba(var(--color-primary-rgb), .25);background:linear-gradient(45deg, transparent 50%, var(--color-primary) 50%), linear-gradient(135deg, var(--color-primary) 50%, transparent 50%);background-position:calc(100% - 15px) calc(1em + 2px),calc(100% - 10px) calc(1em + 2px);background-repeat:no-repeat;background-size:5px 5px,5px 5px;outline:0}select:disabled,.form-select:disabled{background-color:var(--color-background-light);cursor:not-allowed}.impressum-container{max-width:800px;padding:var(--content-padding);margin:0 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#0000001a}.user-id{color:var(--color-text-muted);margin-bottom:var(--content-padding-quarter);font-size:.9rem}.user-email{color:var(--color-text);word-break:break-all;font-weight:600}.user-card-body{padding:var(--content-padding-half)}.user-info-group{margin-bottom:var(--content-padding-half)}.user-info-group:last-child{margin-bottom:0}.info-label{color:var(--color-text-muted);margin-bottom:var(--content-padding-quarter);font-size:.85rem;display:block}.info-value{color:var(--color-text);font-weight:500}.user-card-footer{padding:var(--content-padding-half);text-align:right;border-top:1px solid #0000001a}.menu-button{height:38px;padding:0 var(--content-padding-half);background-color:var(--color-correct);color:var(--color-correct-text);border-radius:6px;justify-content:center;align-items:center;text-decoration:none;transition:background-color .2s;display:inline-flex}.menu-button:hover{background-color:var(--color-correct-dark)}.feedback-section{margin-top:var(--content-padding)}.feedback-section h2{margin-bottom:var(--content-padding-half);padding-left:var(--content-padding-half)}.feedback-grid{gap:var(--content-padding);padding:var(--content-padding-half);grid-template-columns:repeat(auto-fill,minmax(350px,1fr));display:grid}.feedback-card{background:var(--color-background-light);border-radius:12px;transition:transform .2s,box-shadow .2s;box-shadow:0 2px 8px #0000001a}.feedback-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.feedback-card-header{padding:var(--content-padding-half);background-color:var(--color-background-dark);border-bottom:1px solid #0000001a;border-radius:12px 12px 0 0}.feedback-id{color:var(--color-text-muted);margin-bottom:var(--content-padding-quarter);font-size:.9rem}.feedback-email{color:var(--color-text);word-break:break-all;font-weight:600}.feedback-card-body{padding:var(--content-padding-half)}.feedback-message{margin-bottom:var(--content-padding)}.message-content{margin-top:var(--content-padding-quarter);padding:var(--content-padding-half);background-color:var(--color-background-dark);white-space:pre-wrap;word-break:break-word;border-radius:6px}.feedback-info-group{margin-bottom:var(--content-padding-half)}.url-value,.agent-value{word-break:break-all;font-size:.9rem}@media (max-width:640px){.feedback-grid{padding:var(--content-padding-quarter);grid-template-columns:1fr}.feedback-card{margin-bottom:var(--content-padding-half)}.feedback-section 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(max-width:640px){.users-grid{padding:var(--content-padding-quarter);grid-template-columns:1fr}.user-card{margin-bottom:var(--content-padding-half)}.user-details{padding:var(--content-padding-quarter)}.user-info-card{border-radius:8px;margin:0}.user-info-header{padding:var(--content-padding-half)}.user-info-header h2{word-break:break-all;font-size:1.2rem}.user-info-body{padding:var(--content-padding-half)}.user-info-footer{padding:var(--content-padding-half);gap:var(--content-padding-half);flex-direction:column}.menu-button{width:100%;height:38px}.admin-user-header{gap:var(--content-padding-half);margin-bottom:var(--content-padding-half);flex-direction:column;align-items:stretch}.admin-user-header h1{text-align:center;font-size:1.5rem}.admin-user-header .btn{text-align:center;width:100%}.menu-button{margin-top:var(--content-padding-quarter);text-align:center}}.stats-section{margin-bottom:2rem}.stats-card{background:var(--milk-glass);border-radius:8px;padding:1.5rem;box-shadow:0 2px 4px 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.5rem;font-size:1.1rem}.last-active{color:var(--color-text-muted);font-size:.85rem}.user-stat-body{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.user-stat-body .stat-item{background:var(--color-background-dark);text-align:center;border-radius:6px;padding:.75rem}.user-stat-body .stat-label{color:var(--color-text-muted);margin-bottom:.25rem;font-size:.85rem;display:block}.user-stat-body .stat-value{color:var(--color-text);font-size:1.25rem;font-weight:700}.user-dates{color:var(--color-text-muted);flex-direction:column;gap:.5rem;font-size:.85rem;display:flex}.date-info,.last-active{align-items:center;gap:.5rem;display:flex}#overlay{z-index:500;opacity:0;pointer-events:none;background:#00000080;width:100%;height:100%;transition:opacity .3s ease-in-out;position:fixed;top:0;left:0}#overlay.active{opacity:1;pointer-events:auto}aside{z-index:900;background:#fff;width:320px;height:100%;padding-top:80px;transition:right .3s 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p{color:var(--color-text);flex-grow:1;margin-bottom:1.2rem}.lessons-benefits{background-color:var(--color-bg-lighter);border-radius:8px;padding:1.5rem}.lessons-benefits h3{color:var(--color-text-dark);margin-top:0}.lessons-benefits ul{padding-left:1.5rem}.lessons-benefits li{margin-bottom:.8rem;font-size:1.05rem}@media (max-width:768px){.lessons-grid{grid-template-columns:1fr}.level-title{font-size:1.5rem}.lessons-intro p,.lessons-benefits li{font-size:1rem}}.lesson-header-buttons{justify-content:space-between;width:100%;margin-top:2rem;margin-bottom:1rem;display:flex}.lesson-header-buttons button{transition:all .2s}.lesson-header-buttons button:hover{background-color:var(--color-primary);color:#fff;transform:translateY(-2px)}.lesson-header-buttons button.hidden{display:none}.lesson-vocabulary{margin:2rem 0}.lesson-vocabulary h3{margin-top:0;margin-bottom:1rem}.lessons-container .letter-card 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.3s;display:flex}.dialogue-message.playing{opacity:1;transform:scale(1.02);box-shadow:0 2px 12px #00000026}.dialogue-message.speaker-1{border-bottom-left-radius:4px;align-self:flex-start}.dialogue-message.speaker-2{background:var(--color-primary-light);border-bottom-right-radius:4px;align-self:flex-end}.dialogue-avatar{background:var(--color-background-light);border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:1.2rem;display:flex}.dialogue-content{flex:1;margin-top:-.5rem}.dialogue-text{color:var(--color-text);margin:0;font-size:1rem;line-height:1.4}.dialogue-translation{color:var(--color-text-muted);margin:.25rem 0 0;font-size:.9rem;font-style:italic}@media (max-width:640px){.dialogue{margin:1rem;padding:.75rem}.dialogue-message{max-width:90%}}.dialogue-with-image{max-width:1200px}.dialogue-with-image .dialogue-header{margin-bottom:1.5rem}.dialogue-with-image .dialogue-content{flex-direction:column;gap:1.5rem;display:flex}.dialogue-with-image .dialogue-image{width:50%;max-width:600px;margin:0 auto}.dialogue-with-image .dialogue-image img{border-radius:8px;width:100%;height:auto;box-shadow:0 2px 8px #0000001a}@media (min-width:768px){.dialogue-with-image .dialogue-content{flex-direction:row;align-items:flex-start;gap:2rem}.dialogue-with-image .dialogue-image{flex-shrink:0;margin:0}.dialogue-with-image .dialogue-messages{flex:1}}.train-reading-container .lesson-banner{margin-bottom:0}.reading-header{text-align:center;margin:0 auto;padding:0 2rem}.reading-header h1{color:#2c3e50;margin-bottom:.5rem;font-size:2.5rem}.reading-header p{color:#7f8c8d;font-size:1.2rem}.alert{text-align:center;border-radius:12px;margin-bottom:2rem;padding:2rem}.alert-info{color:#1565c0;background:linear-gradient(135deg,#e3f2fd 0%,#bbdefb 100%);border:2px solid #2196f3}.alert-error{color:#c62828;background:linear-gradient(135deg,#ffebee 0%,#ffcdd2 100%);border:2px solid #f44336}.alert h3{margin-bottom:1rem;font-size:1.5rem}.alert p{margin-bottom:1.5rem;font-size:1.1rem}.story-section{margin-bottom:3rem}.story-container{margin-bottom:2rem}.story-container h2{color:#ef6c00;text-align:center;margin-bottom:1.5rem;font-size:1.8rem}.chinese-story{text-align:left;border-radius:12px;max-width:800px;margin:0 auto;font-size:1.5rem;line-height:2rem;overflow:hidden}.story-line{background:#f0f0f0;border-left:4px solid #0000;align-items:center;gap:.2rem;min-height:3rem;padding:.5rem .5rem 0;transition:border-left-color .3s;display:flex}.story-line .letter-card{position:relative;top:-.3rem}.known-character{cursor:help;color:inherit;background:#4caf501a;border-bottom:2px solid #4caf50;border-radius:4px;padding:2px 4px;font-weight:400;text-decoration:none;transition:all .3s}.known-character:hover{color:inherit;background:#4caf5033;text-decoration:none;transform:translateY(-1px);box-shadow:0 2px 8px #4caf504d}.translation-container{text-align:center;padding:1rem 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#4caf5026}.reading-stats h3{color:#2e7d32;margin-bottom:1.5rem;font-size:1.8rem}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1.5rem;margin-top:1rem;display:grid}.stat-item{background:#fff;border:1px solid #81c784;border-radius:12px;padding:1.5rem;transition:transform .3s;box-shadow:0 4px 12px #4caf501a}.stat-item:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4caf5033}.stat-number{color:#2e7d32;margin-bottom:.5rem;font-size:2.5rem;font-weight:700}.stat-label{color:#4caf50;font-size:1rem;font-weight:500}.play-line-btn{color:#2980b9;cursor:pointer;white-space:nowrap;background:#3498db1a;border:1px solid #3498db;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;gap:.3rem;min-width:90px;margin-left:auto;padding:.4rem .8rem;font-size:.9rem;transition:all .3s;display:inline-flex}.play-line-btn:hover{background:#3498db33;transform:translateY(-1px);box-shadow:0 2px 8px #3498db4d}.play-line-btn.playing{color:#fff;background:#e74c3c;border-color:#c0392b;animation:1.5s infinite pulse}.play-all-container{text-align:center;margin:2rem 0}.play-all-btn{color:#fff;cursor:pointer;background:linear-gradient(135deg,#3498db 0%,#2980b9 100%);border:none;border-radius:12px;align-items:center;gap:.5rem;padding:1rem 2rem;font-size:1.1rem;transition:all .3s;display:inline-flex;box-shadow:0 4px 15px #3498db4d}.play-all-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #3498db66}.play-all-btn.playing{background:linear-gradient(135deg,#e74c3c 0%,#c0392b 100%);animation:1.5s infinite pulse}.audio-card.current-playing{animation:1.5s infinite alternate glow;transform:scale(1.05);box-shadow:0 4px 12px #2ecc7166;background:#2ecc7133!important;border-bottom:3px solid #27ae60!important}.story-line.current-line-playing{border-left-color:#3498db;animation:2s infinite alternate lineGlow;background:linear-gradient(90deg,#3498db1a 0%,#3498db0d 100%)!important}@keyframes pulse{0%{box-shadow:0 4px 15px #e74c3c4d}50%{box-shadow:0 4px 20px #e74c3c80}to{box-shadow:0 4px 15px #e74c3c4d}}@keyframes glow{0%{box-shadow:0 4px 12px #2ecc7166}to{box-shadow:0 6px 16px #2ecc7199}}@keyframes lineGlow{0%{background:linear-gradient(90deg,#3498db1a 0%,#3498db0d 100%)}to{background:linear-gradient(90deg,#3498db26 0%,#3498db14 100%)}}@keyframes titleGlow{0%{box-shadow:0 4px 12px #f5576c66;background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%)!important}to{box-shadow:0 6px 20px #f5576c99;background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%)!important}}@media (max-width:768px){.reading-header h1{font-size:2rem}.chinese-story{padding:1.5rem;font-size:1.5rem}.story-line{flex-direction:column;align-items:stretch;gap:.75rem;min-height:auto;padding:.75rem .5rem}.story-title{padding:1rem .5rem;font-size:1.4rem!important}.story-actions{flex-direction:column;align-items:center}.vocabulary-grid,.stats-grid{grid-template-columns:1fr}.play-all-btn{padding:.8rem 1.5rem;font-size:1rem}.play-line-btn{align-self:center;min-width:80px;margin-left:0;padding:.3rem .6rem;font-size:.8rem}.translation-toggle-btn{margin-bottom:1rem;padding:.4rem .8rem;font-size:.9rem}.english-translation{padding:1rem;font-size:1.1rem}}.question-container{background:linear-gradient(135deg,#fff3e0 0%,#ffe0b2 100%);border:2px solid #ff9800;border-radius:12px;margin:2rem 0;padding:1.5rem 2rem;box-shadow:0 4px 12px #ff98001a}.question-container h3{text-align:center;color:#e65100;border:none;margin-bottom:1.5rem;font-size:1.5rem}.question-content{color:#bf360c;max-width:800px;margin:0 auto;font-size:1.1rem;line-height:1.6}.question-content strong{color:#e65100}.question-title{text-align:center;color:#e65100;margin-bottom:1.5rem;font-size:1.2rem;font-weight:600}.question-options{gap:.8rem;max-width:600px;margin:0 auto;display:grid}.question-option-btn{cursor:pointer;text-align:left;background:#fff;border:2px solid #ff9800;border-radius:8px;align-items:center;gap:.8rem;padding:.8rem 1rem;font-size:1rem;transition:all .3s;display:flex}.question-option-btn:hover:not(:disabled){background:#ff98001a;transform:translateY(-1px);box-shadow:0 2px 8px #ff980033}.question-option-btn:disabled{cursor:not-allowed}.question-option-btn.correct{color:#fff;background:#4caf50;border-color:#4caf50}.question-option-btn.incorrect{color:#fff;background:#f44336;border-color:#f44336}.option-letter{color:#e65100;min-width:1.5rem;font-weight:600}.question-option-btn.correct .option-letter,.question-option-btn.incorrect .option-letter{color:#fff}.option-text{color:#bf360c;flex:1}.question-option-btn.correct .option-text,.question-option-btn.incorrect .option-text{color:#fff}.question-feedback{text-align:center;border-radius:8px;margin-top:1rem;padding:1rem;font-weight:500}.question-feedback.correct{color:#2e7d32;background:linear-gradient(135deg,#e8f5e8 0%,#c8e6c9 100%);border:2px solid #4caf50}.question-feedback.incorrect{color:#c62828;background:linear-gradient(135deg,#ffebee 0%,#ffcdd2 100%);border:2px solid #f44336}