:root{--primary-50: #fde8e7;--primary-100: #fac6c4;--primary-200: #f5a09c;--primary-300: #ef7772;--primary-400: #eb544e;--primary-500: #ce2e29;--primary-600: #f16059;--primary-700: #b52520;--primary-800: #931c18;--primary-900: #781511;--accent-green: #6a9a8a;--accent-green-light: #d1fae5;--accent-orange: #f59e0b;--accent-orange-light: #fef3c7;--accent-red: #ef4444;--accent-red-light: #fee2e2;--accent-purple: #8b5cf6;--accent-purple-light: #ede9fe;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px -1px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px 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.header__nav-icon{background:transparent;color:#ff9b96}.header__nav-text{font-weight:600}.header__dropdown{position:relative}.header__dropdown-trigger{background:none;border:none;cursor:pointer;display:flex;align-items:center;gap:6px;padding:0;font-family:var(--font-body)}.header__dropdown-arrow{font-size:.75rem;display:inline-block;transition:transform var(--transition-fast);line-height:1}.header__dropdown-arrow--open{transform:rotate(180deg)}.header__dropdown-menu{position:absolute;top:calc(100% + 10px);left:0;background:#1e1e1e;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);min-width:180px;z-index:200;display:flex;flex-direction:column;overflow:hidden;animation:dropdownFadeIn .15s ease}@keyframes dropdownFadeIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.header__dropdown-item{display:flex;align-items:center;gap:8px;padding:10px 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var(--gray-200)}.btn--secondary:hover:not(:disabled){background:var(--gray-200);border-color:var(--gray-300)}.btn--success{background:linear-gradient(135deg,var(--accent-green) 0%,#059669 100%);color:#fff;box-shadow:var(--shadow-md),0 4px 12px #10b9814d}.btn--success:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-lg),0 6px 16px #10b98166}.btn--full{width:100%}.btn--lg{padding:var(--space-4) var(--space-8);font-size:1rem}.btn__icon{font-size:1.125rem}.preview-panel{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden;display:flex;flex-direction:column;min-width:0;max-width:100%}.preview-panel__header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-6);background:var(--gray-50);border-bottom:1px solid 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#e5e7eb;border-radius:0;position:relative;transform:scale(1);transform-origin:top center}.worksheet-preview--themed{border-color:transparent;background-size:cover;background-position:center;transform:scale(.8);transform-origin:top center}.worksheet-preview__watermark{position:absolute;bottom:var(--space-4);left:50%;transform:translate(-50%);font-size:.625rem;color:var(--gray-400);opacity:.7}.worksheet-preview__header-row{display:flex;align-items:center;gap:var(--space-4);margin-bottom:var(--space-4);padding-bottom:var(--space-4)}.worksheet-preview__logo-row{display:flex;justify-content:flex-start;margin-bottom:var(--space-2)}.worksheet-preview__title-row{display:flex;justify-content:center;margin-bottom:var(--space-6)}.worksheet-preview__logo{height:32px;width:auto;object-fit:contain;flex-shrink:0}.worksheet-preview__title{font-family:var(--font-display);font-size:1.2rem;font-weight:600;color:#f16059;text-align:center;flex:1;margin:0}.worksheet-preview__name-date{display:flex;justify-content:space-between;margin-bottom:var(--space-4);gap:var(--space-8)}.worksheet-preview__field{flex:1;display:flex;align-items:center;gap:var(--space-2);font-size:.875rem;color:var(--gray-600)}.worksheet-preview__field-line{flex:1;border-bottom:1px solid var(--gray-400);min-height:1px}.problems-grid{display:grid;gap:var(--space-6)}.problems-grid--vertical{grid-template-columns:repeat(auto-fit,minmax(100px,1fr))}.problems-grid--horizontal{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.problem{display:flex;align-items:flex-start;gap:var(--space-2)}.problem__number{font-size:.75rem;color:var(--gray-400);min-width:20px}.problem__content{font-family:Courier New,monospace;font-size:1.125rem;font-weight:600;color:var(--gray-800)}.problem--vertical .problem__content{display:flex;flex-direction:column;align-items:flex-end}.problem--vertical .problem__operand{padding:var(--space-1) 0}.problem--vertical .problem__operator-row{display:flex;align-items:center;gap:var(--space-2)}.problem--vertical .problem__operator{font-size:1rem}.problem--vertical .problem__line{width:80px;border-bottom:2px solid var(--gray-700);margin-top:var(--space-1)}.problem--vertical .problem__answer{padding-top:var(--space-2);min-height:1.5em;color:var(--accent-green)}.problem--horizontal .problem__content{display:flex;align-items:center;gap:var(--space-2)}.problem--horizontal .problem__equals{margin-left:var(--space-2)}.problem--horizontal .problem__answer-space{display:inline-block;width:40px;border-bottom:2px solid var(--gray-400);margin-left:var(--space-2)}.problem--horizontal .problem__answer{color:var(--accent-green);font-weight:700}.preview-panel__actions{display:flex;gap:var(--space-3);padding:var(--space-4) var(--space-6);background:#fff;border-top:1px solid var(--gray-200);flex-wrap:wrap}.preview-panel__actions .btn{flex:1;min-width:140px}.theme-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:var(--space-3)}.theme-card{position:relative;aspect-ratio:3/4;border-radius:var(--radius-md);overflow:hidden;cursor:pointer;border:3px solid transparent;transition:all var(--transition-fast);background:var(--gray-100)}.theme-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.theme-card--active{border-color:var(--primary-500);box-shadow:0 0 0 3px #00a9ce33}.theme-card__preview{width:100%;height:100%;object-fit:cover}.theme-card__label{position:absolute;bottom:0;left:0;right:0;padding:var(--space-2);background:linear-gradient(transparent,#000000b3);color:#fff;font-size:.6875rem;font-weight:600;text-align:center}.theme-card--blank{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--gray-50) 0%,var(--gray-100) 100%);border:3px dashed var(--gray-300)}.theme-card--blank .theme-card__preview{display:none}.theme-card--blank .theme-card__icon{font-size:2rem;color:var(--gray-400)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--space-4);animation:fadeIn var(--transition-fast)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);max-width:600px;width:100%;max-height:80vh;overflow:hidden;animation:slideUp var(--transition-normal)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal__header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-6);border-bottom:1px solid var(--gray-200)}.modal__title{font-family:var(--font-display);font-size:1.25rem;font-weight:600;color:var(--gray-800)}.modal__close{width:36px;height:36px;display:flex;align-items:center;justify-content:center;font-size:1.25rem;color:var(--gray-500);background:var(--gray-100);border:none;border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast)}.modal__close:hover{background:var(--gray-200);color:var(--gray-700)}.modal__content{padding:var(--space-6);overflow-y:auto;max-height:calc(80vh - 72px)}.modal__content ul{padding-left:var(--space-6)}.modal__content li{margin-bottom:var(--space-3);color:var(--gray-700);line-height:1.6}.modal__content strong{color:var(--gray-800)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-12);text-align:center;color:var(--gray-500)}.empty-state__icon{font-size:4rem;margin-bottom:var(--space-4);opacity:.5}.empty-state__title{font-family:var(--font-display);font-size:1.25rem;font-weight:600;color:var(--gray-600);margin-bottom:var(--space-2)}.empty-state__text{font-size:.9375rem;max-width:300px}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-pulse{animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.animate-bounce{animation:bounce 1s ease-in-out infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.animate-spin{animation:spin 1s linear infinite}@media (max-width: 768px){.header{padding:var(--space-3) 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