:root{--color-primary: #2563eb;--color-primary-light: #3b82f6;--color-danger: #dc2626;--color-success: #16a34a;--color-success-light: #22c55e;--color-warning: #f59e0b;--color-bromine: #a8501c;--color-carbon: #1e293b;--color-hydrogen: #64748b;--color-panel: rgba(255, 255, 255, .95);--color-panel-solid: #ffffff;--color-text: #1e293b;--color-text-light: #64748b;--radius: 12px;--shadow: 0 4px 20px rgba(0, 0, 0, .15);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .2)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:linear-gradient(135deg,#1e3a5f,#2d1b4e);min-height:100vh;color:var(--color-text);overflow-x:hidden}.app-container{display:flex;height:100vh;padding:16px;gap:16px}.app-header{color:#fff;text-align:center;font-size:1.4em;font-weight:700;text-shadow:1px 1px 3px rgba(0,0,0,.3);margin-bottom:8px}.main-area{flex:1;display:flex;flex-direction:column;gap:12px;min-width:0}.step-title{color:#fff;text-align:center;font-size:1.1em;opacity:.9}.quiz-start-btn{background:var(--color-primary);color:#fff;border:none;padding:14px 36px;border-radius:25px;font-size:1.15em;font-weight:600;cursor:pointer;transition:background .2s,transform .15s}.quiz-start-btn:hover{background:var(--color-primary-dark, #1d4ed8);transform:scale(1.04)}.menu-container{max-width:700px;margin:0 auto;padding:40px 20px;text-align:center}.menu-title{color:#fff;font-size:2.2em;font-weight:700;margin-bottom:8px;text-shadow:1px 1px 3px rgba(0,0,0,.3)}.menu-subtitle{color:#fffc;font-size:1.15em;margin-bottom:40px}.menu-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.menu-card{background:var(--color-panel);border:2px solid transparent;border-radius:var(--radius);padding:28px 20px;text-align:center;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow);position:relative}.menu-card:hover:not(:disabled){border-color:var(--color-primary);transform:translateY(-3px);box-shadow:var(--shadow-lg)}.menu-card-disabled{opacity:.55;cursor:not-allowed}.menu-icon{font-size:2.5em;display:block;margin-bottom:12px}.menu-card-title{font-size:1.25em;font-weight:700;color:var(--color-text);margin-bottom:4px}.menu-card-subtitle{font-size:.9em;color:var(--color-primary);font-weight:600;margin-bottom:10px}.menu-card-description{font-size:.85em;color:var(--color-text-light);line-height:1.4}.menu-coming-soon{position:absolute;top:10px;right:10px;background:#00000014;color:var(--color-text-light);padding:2px 8px;border-radius:8px;font-size:.72em;font-style:italic}@media(max-width:600px){.menu-grid{grid-template-columns:1fr}}.selector-container{max-width:700px;margin:0 auto;padding:40px 20px;text-align:center}.selector-back-btn{background:none;border:none;color:#fffc;font-size:.95em;cursor:pointer;margin-bottom:16px;transition:color .2s}.selector-back-btn:hover{color:#fff}.selector-title{color:#fff;font-size:2em;font-weight:700;margin-bottom:8px;text-shadow:1px 1px 3px rgba(0,0,0,.3)}.selector-subtitle{color:#fffc;font-size:1.15em;margin-bottom:32px}.reaction-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.reaction-card{background:var(--color-panel);border:2px solid transparent;border-radius:var(--radius);padding:20px;text-align:left;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow);position:relative}.reaction-card:hover:not(:disabled){border-color:var(--color-primary);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.reaction-card.coming-soon{opacity:.55;cursor:not-allowed}.card-title{font-size:1.2em;font-weight:700;color:var(--color-text);margin-bottom:4px}.card-subtitle{font-size:.9em;color:var(--color-text-light);margin-bottom:12px}.card-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.tag{background:#3b82f61a;color:var(--color-primary);padding:2px 8px;border-radius:12px;font-size:.75em;font-weight:600}.difficulty{font-size:.78em;font-weight:600;padding:2px 10px;border-radius:12px}.difficulty-einfach{background:#dcfce7;color:#166534}.difficulty-mittel{background:#fef3c7;color:#92400e}.difficulty-schwer{background:#fee2e2;color:#991b1b}.coming-soon-badge{position:absolute;top:10px;right:10px;background:#00000014;color:var(--color-text-light);padding:2px 8px;border-radius:8px;font-size:.72em;font-style:italic}.toolbar{width:160px;background:var(--color-panel);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px;flex-shrink:0}.toolbar-title{font-size:1.1em;color:var(--color-text);text-align:center}.toolbar-hint{font-size:.78em;color:var(--color-text-light);text-align:center;line-height:1.3}.label-list{display:flex;flex-direction:column;gap:10px}.draggable-label{background:#fff;border:2px solid var(--color-primary-light);border-radius:10px;padding:14px 10px;text-align:center;cursor:grab;transition:all .2s ease;-webkit-user-select:none;user-select:none;touch-action:none;display:flex;flex-direction:column;align-items:center;gap:4px}.draggable-label:hover:not(.placed):not(.disabled){border-color:var(--color-primary);background:#eff6ff;transform:translateY(-2px);box-shadow:0 4px 12px #2563eb33}.draggable-label:active:not(.placed):not(.disabled){cursor:grabbing;transform:scale(.95)}.draggable-label.placed{opacity:.3;cursor:default;border-color:var(--color-success);background:#f0fdf4}.draggable-label.disabled{opacity:.5;cursor:not-allowed}.label-symbol{font-size:1.6em;font-weight:700;color:var(--color-primary)}.label-name{font-size:.7em;color:var(--color-text-light)}.draggable-label.placed .label-symbol{color:var(--color-success)}.toolbar-empty{font-size:.85em;color:var(--color-text-light);text-align:center;font-style:italic}.canvas-container{flex:1;min-height:0;display:flex;align-items:center;justify-content:center}.mechanism-svg{width:100%;height:100%;border-radius:var(--radius);box-shadow:var(--shadow-lg);background:#fff;touch-action:none;-webkit-user-select:none;user-select:none}.snap-zone-idle{transition:all .3s ease}.snap-zone-near{transition:all .15s ease}.ghost-label{pointer-events:none;filter:drop-shadow(0 2px 4px rgba(0,0,0,.2))}.curly-arrow{filter:drop-shadow(0 1px 2px rgba(0,0,0,.15))}.step-indicator{text-align:center}.step-dots{display:flex;justify-content:center;gap:8px;margin-bottom:6px}.step-dot{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.85em;font-weight:600;background:#fff3;color:#ffffff80;transition:all .3s ease}.step-dot.active{background:var(--color-primary);color:#fff;box-shadow:0 0 12px #2563eb80;transform:scale(1.1)}.step-dot.completed{background:var(--color-success);color:#fff}.step-title-text{color:#ffffffd9;font-size:.95em}.feedback-panel{background:var(--color-panel);border-radius:var(--radius);padding:10px 16px;box-shadow:var(--shadow);display:flex;align-items:center;gap:12px}.feedback-content{flex:1;min-width:0}.instruction-text{font-size:.95em;color:var(--color-text);font-weight:500;margin:0}.feedback-message{display:flex;align-items:flex-start;gap:8px;padding:6px 12px;border-radius:8px;font-weight:500;font-size:.88em;line-height:1.4;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.feedback-success{background:#dcfce7;color:#166534;border:1px solid #bbf7d0}.feedback-partial{background:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}.feedback-error{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}.feedback-hint{background:#fef3c7;color:#92400e;border:1px solid #fde68a}.feedback-icon{font-weight:700;font-size:1.1em;flex-shrink:0}.feedback-buttons{display:flex;gap:8px;flex-shrink:0}.btn{padding:8px 18px;border-radius:25px;border:none;font-size:.9em;font-weight:600;cursor:pointer;transition:all .2s ease;white-space:nowrap}.btn:hover{transform:translateY(-1px)}.btn-back{background:#fff;color:var(--color-text-light);border:2px solid var(--color-text-light)}.btn-back:hover{background:var(--color-text-light);color:#fff}.btn-hint{background:#fff;color:var(--color-warning);border:2px solid var(--color-warning)}.btn-hint:hover{background:var(--color-warning);color:#fff}.btn-next{background:var(--color-primary);color:#fff;box-shadow:0 2px 8px #2563eb4d;animation:pulse-btn 1.5s ease-in-out infinite}.btn-next:hover{background:#1d4ed8;animation:none}@keyframes pulse-btn{0%,to{box-shadow:0 2px 8px #2563eb4d}50%{box-shadow:0 2px 20px #2563eb99}}.info-box{display:flex;align-items:flex-start;gap:10px;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:10px 14px;margin-bottom:8px}.info-box-icon{background:#3b82f6;color:#fff;width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75em;font-weight:700;flex-shrink:0;margin-top:1px}.info-box-text{font-size:.85em;color:#1e40af;line-height:1.4}.quiz-container{display:flex;flex-direction:column;gap:20px;padding:16px}.quiz-question{background:var(--color-panel-solid);border-radius:var(--radius);padding:20px;box-shadow:0 2px 8px #00000014;transition:all .3s ease}.quiz-question.correct{border-left:4px solid var(--color-success)}.quiz-question-text{font-size:1.1em;font-weight:600;margin-bottom:12px;color:var(--color-text)}.quiz-text-input{display:flex;gap:8px}.quiz-text-input input{flex:1;padding:10px 14px;border:2px solid #e2e8f0;border-radius:8px;font-size:1em;outline:none;transition:border-color .2s}.quiz-text-input input:focus{border-color:var(--color-primary)}.quiz-text-input input:disabled{background:#f0fdf4;border-color:var(--color-success)}.quiz-text-input button{padding:10px 20px;background:var(--color-primary);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:background .2s}.quiz-text-input button:hover:not(:disabled){background:#1d4ed8}.quiz-text-input button:disabled{opacity:.5;cursor:default}.quiz-choices{display:flex;flex-direction:column;gap:8px}.quiz-choice{padding:12px 16px;background:#fff;border:2px solid #e2e8f0;border-radius:8px;text-align:left;font-size:.95em;cursor:pointer;transition:all .2s}.quiz-choice:hover:not(:disabled){border-color:var(--color-primary);background:#eff6ff}.quiz-choice.correct{border-color:var(--color-success);background:#f0fdf4;color:#166534}.quiz-choice.wrong{border-color:var(--color-danger);background:#fef2f2;color:#991b1b}.quiz-choice:disabled{cursor:default;opacity:.7}.quiz-feedback-correct{margin-top:8px;color:var(--color-success);font-weight:600}.quiz-feedback-wrong{margin-top:8px;color:var(--color-danger);font-weight:500}.teil-container{max-width:900px;margin:0 auto;padding:40px 20px;text-align:center}.teil-back-btn{background:none;border:none;color:#fffc;font-size:.95em;cursor:pointer;margin-bottom:16px;transition:color .2s}.teil-back-btn:hover{color:#fff}.teil-title{color:#fff;font-size:2em;font-weight:700;margin-bottom:4px;text-shadow:1px 1px 3px rgba(0,0,0,.3)}.teil-subtitle{color:#ffffffb3;font-size:1.05em;margin-bottom:36px}.teil-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.teil-card{background:var(--color-panel);border:2px solid transparent;border-radius:var(--radius);padding:24px 16px;text-align:center;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow);position:relative}.teil-card:hover:not(:disabled){border-color:var(--color-primary);transform:translateY(-3px);box-shadow:var(--shadow-lg)}.teil-locked{opacity:.5;cursor:not-allowed}.teil-completed{border-color:var(--color-success)}.teil-lock{position:absolute;top:10px;right:10px;font-size:1.2em}.teil-check{position:absolute;top:10px;right:10px;background:var(--color-success);color:#fff;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.85em;font-weight:700}.teil-icon{font-size:2.2em;display:block;margin-bottom:8px}.teil-number{font-size:.75em;font-weight:700;color:var(--color-primary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px}.teil-card-title{font-size:1.15em;font-weight:700;color:var(--color-text);margin-bottom:2px}.teil-card-subtitle{font-size:.85em;color:var(--color-primary);font-weight:600;margin-bottom:10px}.teil-card-description{font-size:.82em;color:var(--color-text-light);line-height:1.4}.teil-lock-hint{font-size:.75em;color:var(--color-danger);font-style:italic;margin-top:8px}@media(max-width:768px){.teil-grid{grid-template-columns:1fr;max-width:400px;margin:0 auto}}.slide-container{background:var(--color-panel);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.slide-image-wrapper{background:#fff;padding:16px;display:flex;justify-content:center;align-items:center;min-height:180px}.slide-image{max-width:100%;max-height:280px;object-fit:contain}.slide-text{padding:20px}.slide-description{font-size:1em;color:var(--color-text);line-height:1.6;margin-bottom:8px}.slide-detail{font-size:.92em;color:var(--color-text-light);line-height:1.5;font-style:italic}.qblock-container{display:flex;flex-direction:column;gap:20px}.qblock-question{background:var(--color-panel);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.qblock-text{font-size:1.05em;font-weight:600;color:var(--color-text);margin-bottom:14px;line-height:1.4}.qblock-options{display:flex;flex-direction:column;gap:8px}.qblock-option{background:#f8fafc;border:2px solid #e2e8f0;border-radius:8px;padding:12px 16px;text-align:left;font-size:.95em;cursor:pointer;transition:all .2s;color:var(--color-text)}.qblock-option:hover:not(:disabled){border-color:var(--color-primary);background:#eff6ff}.qblock-option:disabled{cursor:default}.qblock-option.qblock-correct{border-color:var(--color-success);background:#dcfce7;color:#166534}.qblock-option.qblock-wrong{border-color:var(--color-danger);background:#fee2e2;color:#991b1b}.qblock-truefalse{display:flex;gap:12px}.qblock-tf-btn{flex:1;padding:14px;border:2px solid #e2e8f0;border-radius:8px;font-size:1.05em;font-weight:600;cursor:pointer;background:#f8fafc;transition:all .2s;color:var(--color-text)}.qblock-tf-btn:hover:not(:disabled){border-color:var(--color-primary);background:#eff6ff}.qblock-tf-btn:disabled{cursor:default}.qblock-tf-btn.qblock-correct{border-color:var(--color-success);background:#dcfce7;color:#166534}.qblock-tf-btn.qblock-wrong{border-color:var(--color-danger);background:#fee2e2;color:#991b1b}.qblock-explanation{margin-top:12px;padding:12px 16px;border-radius:8px;font-size:.9em;line-height:1.5}.qblock-explanation-correct{background:#f0fdf4;border-left:3px solid var(--color-success);color:#166534}.qblock-explanation-wrong{background:#fef2f2;border-left:3px solid var(--color-danger);color:#991b1b}.qblock-retry-hint{font-weight:600;margin-bottom:4px}.lern-wrapper{min-height:100vh;padding:20px;display:flex;flex-direction:column;align-items:center;overflow-y:auto}.lern-header{text-align:center;margin-bottom:20px;max-width:700px;width:100%}.lern-back-btn{background:none;border:none;color:#fffc;font-size:.95em;cursor:pointer;margin-bottom:8px;transition:color .2s}.lern-back-btn:hover{color:#fff}.lern-title{color:#fff;font-size:1.6em;font-weight:700;text-shadow:1px 1px 3px rgba(0,0,0,.3);margin-bottom:12px}.lern-progress{display:flex;justify-content:center;gap:8px}.lern-dot{width:12px;height:12px;border-radius:50%;background:#ffffff4d;transition:all .3s}.lern-dot-active{background:#fff;transform:scale(1.2)}.lern-dot-done{background:var(--color-success-light, #22c55e)}.lern-content{max-width:700px;width:100%;display:flex;flex-direction:column;gap:16px}.lern-step-title{color:#fff;font-size:1.2em;font-weight:600;text-align:center;text-shadow:1px 1px 2px rgba(0,0,0,.2)}.lern-nav{display:flex;justify-content:center;gap:12px;margin-top:8px;padding-bottom:24px}.lern-btn{padding:12px 28px;border-radius:25px;font-size:1em;font-weight:600;cursor:pointer;border:none;transition:all .2s}.lern-btn-primary{background:var(--color-primary);color:#fff}.lern-btn-primary:hover{background:var(--color-primary-dark, #1d4ed8);transform:scale(1.03)}.lern-btn-secondary{background:#ffffff26;color:#fff;border:1px solid rgba(255,255,255,.3)}.lern-btn-secondary:hover{background:#ffffff40}.lern-done{background:var(--color-panel);border-radius:var(--radius);padding:48px;text-align:center;box-shadow:var(--shadow-lg);max-width:500px;margin-top:60px}.lern-done-title{font-size:2em;margin-bottom:16px;color:var(--color-success)}.lern-done-text{font-size:1.1em;color:var(--color-text-light);margin-bottom:12px;line-height:1.5}.lern-done .lern-btn{margin-top:16px}.mesomere-container{display:flex;flex-direction:column;gap:16px}.mesomere-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.mesomere-card{background:var(--color-panel);border:2px solid #e2e8f0;border-radius:var(--radius);padding:16px 12px;text-align:center;cursor:pointer;transition:all .2s;position:relative}.mesomere-card:hover:not(:disabled){border-color:var(--color-primary);box-shadow:var(--shadow)}.mesomere-selected{border-color:var(--color-primary);background:#eff6ff}.mesomere-correct{border-color:var(--color-success)!important;background:#dcfce7!important}.mesomere-wrong{border-color:var(--color-danger)!important;background:#fee2e2!important}.mesomere-label{font-size:1em;font-weight:700;color:var(--color-text);margin-bottom:4px}.mesomere-desc{font-size:.82em;color:var(--color-text-light)}.mesomere-check-mark{position:absolute;top:6px;right:8px;color:var(--color-primary);font-weight:700;font-size:1.1em}.mesomere-feedback{padding:12px 16px;border-radius:8px;font-size:.95em;text-align:center;font-weight:600}.mesomere-feedback-success{background:#dcfce7;color:#166534}.mesomere-feedback-error{background:#fee2e2;color:#991b1b}.mesomere-actions{display:flex;align-items:center;justify-content:center;gap:16px}.mesomere-count{font-size:.9em;color:#ffffffb3}.mesomere-check-btn{background:var(--color-primary);color:#fff;border:none;padding:10px 24px;border-radius:25px;font-size:1em;font-weight:600;cursor:pointer;transition:all .2s}.mesomere-check-btn:disabled{opacity:.4;cursor:not-allowed}.mesomere-check-btn:hover:not(:disabled){background:var(--color-primary-dark, #1d4ed8)}@media(max-width:600px){.mesomere-grid{grid-template-columns:repeat(2,1fr)}}.gef-wrapper{min-height:100vh;padding:16px;display:flex;flex-direction:column;align-items:center}.gef-center{justify-content:center}.gef-back-btn{background:none;border:none;color:#fffc;font-size:.95em;cursor:pointer;align-self:flex-start;margin-bottom:4px;transition:color .2s}.gef-back-btn:hover{color:#fff}.gef-title{color:#fff;text-align:center;font-size:1.4em;font-weight:700;text-shadow:1px 1px 3px rgba(0,0,0,.3);margin-bottom:8px}.gef-layout{display:flex;gap:16px;width:100%;max-width:950px}.gef-main{flex:1;display:flex;flex-direction:column;gap:12px;min-width:0}.gef-canvas-container{background:var(--color-panel);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.gef-svg{width:100%;display:block}.gef-post-quiz{max-width:600px;margin:0 auto}.gef-done{background:var(--color-panel);border-radius:var(--radius);padding:48px;text-align:center;box-shadow:var(--shadow-lg);max-width:500px}.gef-done-title{font-size:2em;margin-bottom:16px;color:var(--color-success)}.gef-done p{font-size:1.1em;color:var(--color-text-light);margin-bottom:8px}.gef-points{font-size:1.5em!important;font-weight:700;color:var(--color-primary)!important;margin:16px 0!important}.gef-hints{font-size:.9em!important}.gef-done-btns{display:flex;gap:12px;justify-content:center;margin-top:20px}.gef-btn{padding:12px 28px;border-radius:25px;font-size:1em;font-weight:600;cursor:pointer;border:none;transition:all .2s}.gef-btn-primary{background:var(--color-primary);color:#fff}.gef-btn-primary:hover{background:var(--color-primary-dark, #1d4ed8)}@media(max-width:768px){.gef-layout{flex-direction:column}}.draw-canvas-wrapper{display:flex;flex-direction:column;background:var(--color-panel);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);flex:1;min-width:0}.draw-toolbar{display:flex;gap:8px;padding:8px 12px;background:#f8fafc;border-bottom:1px solid #e2e8f0;flex-wrap:wrap}.draw-tool-btn{padding:6px 14px;border:1px solid #e2e8f0;border-radius:6px;background:#fff;font-size:.85em;cursor:pointer;transition:all .2s;color:var(--color-text)}.draw-tool-btn:hover:not(:disabled){border-color:var(--color-primary);background:#eff6ff}.draw-tool-btn:disabled{opacity:.4;cursor:not-allowed}.draw-tool-delete{margin-left:auto;color:var(--color-danger);border-color:#fecaca}.draw-tool-delete:hover{background:#fee2e2!important;border-color:var(--color-danger)!important}.draw-scroll-area{flex:1;overflow-y:auto;overflow-x:hidden}.draw-container{width:100%}.draw-canvas{display:block;border:none;cursor:crosshair}.solution-panel{display:flex;flex-direction:column;transition:all .3s ease}.solution-visible{flex:1;min-width:280px;max-width:400px}.solution-hidden{flex:0 0 auto}.solution-content{background:var(--color-panel);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);height:100%;display:flex;flex-direction:column}.solution-header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#f0fdf4;border-bottom:1px solid #bbf7d0}.solution-header h3{font-size:.95em;color:#166534;margin:0}.solution-close-btn{background:none;border:none;color:#166534;font-size:.85em;cursor:pointer;padding:4px 8px;border-radius:4px;transition:background .2s}.solution-close-btn:hover{background:#1665341a}.solution-image-wrapper{flex:1;padding:12px;display:flex;justify-content:center;align-items:center;background:#fff;overflow:auto}.solution-image{max-width:100%;max-height:350px;object-fit:contain}.solution-text{padding:12px 14px;font-size:.88em;color:var(--color-text-light);line-height:1.5;border-top:1px solid #e2e8f0}.solution-show-btn{background:var(--color-panel);border:2px dashed #bbf7d0;border-radius:var(--radius);padding:16px 24px;font-size:1em;font-weight:600;color:#166534;cursor:pointer;transition:all .2s;white-space:nowrap}.solution-show-btn:hover{background:#f0fdf4;border-color:#16a34a}@media(max-width:768px){.solution-visible{max-width:none}.solution-image{max-height:250px}}.fz-wrapper{min-height:100vh;padding:16px;display:flex;flex-direction:column;gap:12px}.fz-header{text-align:center}.fz-back-btn{background:none;border:none;color:#fffc;font-size:.95em;cursor:pointer;margin-bottom:4px;transition:color .2s}.fz-back-btn:hover{color:#fff}.fz-title{color:#fff;font-size:1.4em;font-weight:700;text-shadow:1px 1px 3px rgba(0,0,0,.3);margin-bottom:8px}.fz-progress{display:flex;justify-content:center;gap:8px}.fz-dot{width:12px;height:12px;border-radius:50%;background:#ffffff4d;transition:all .3s}.fz-dot-active{background:#fff;transform:scale(1.2)}.fz-dot-done{background:var(--color-success-light, #22c55e)}.fz-step-info{text-align:center;max-width:700px;margin:0 auto}.fz-step-title{color:#fff;font-size:1.15em;font-weight:600;margin-bottom:4px;text-shadow:1px 1px 2px rgba(0,0,0,.2)}.fz-step-task{color:#ffffffe6;font-size:.95em;margin-bottom:4px}.fz-step-hint{color:#fff9;font-size:.85em;font-style:italic}.fz-split-view{display:flex;gap:16px;flex:1;min-height:0;max-height:calc(100vh - 280px)}.fz-nav{display:flex;justify-content:center;gap:12px;padding:8px 0 16px}.fz-btn{padding:12px 28px;border-radius:25px;font-size:1em;font-weight:600;cursor:pointer;border:none;transition:all .2s}.fz-btn-primary{background:var(--color-primary);color:#fff}.fz-btn-primary:hover{background:var(--color-primary-dark, #1d4ed8);transform:scale(1.03)}.fz-btn-secondary{background:#ffffff26;color:#fff;border:1px solid rgba(255,255,255,.3)}.fz-btn-secondary:hover{background:#ffffff40}@media(max-width:768px){.fz-split-view{flex-direction:column;max-height:none}.fz-split-view .solution-visible{max-width:none}}.veresterung-container{min-height:100vh;padding:16px}.veresterung-center{display:flex;justify-content:center;align-items:center}.veresterung-placeholder{background:var(--color-panel);border-radius:var(--radius);padding:48px;text-align:center;box-shadow:var(--shadow-lg);max-width:500px}.veresterung-placeholder h2{font-size:1.5em;margin-bottom:12px}.veresterung-placeholder p{color:var(--color-text-light);margin-bottom:24px}.veresterung-btn{background:var(--color-primary);color:#fff;border:none;padding:12px 28px;border-radius:25px;font-size:1em;font-weight:600;cursor:pointer;transition:background .2s}.veresterung-btn:hover{background:var(--color-primary-dark, #1d4ed8)}