:root{--color-bg-primary: #0f0f1a;--color-bg-secondary: #1a1a2e;--color-bg-card: #252542;--color-bg-hover: #2d2d4a;--color-accent-primary: #6366f1;--color-accent-secondary: #8b5cf6;--color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);--color-success: #10b981;--color-warning: #f59e0b;--color-error: #ef4444;--color-text-primary: #f8fafc;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--border-radius-sm: 8px;--border-radius-md: 12px;--border-radius-lg: 16px;--border-radius-xl: 24px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(99, 102, 241, .3);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-md: 1rem;--font-size-lg: 1.25rem;--font-size-xl: 1.5rem;--font-size-2xl: 2rem;--font-size-3xl: 2.5rem;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);background:var(--color-bg-primary);color:var(--color-text-primary);min-height:100vh;line-height:1.6}#root{min-height:100vh;display:flex;flex-direction:column}.app{min-height:100vh;display:flex;flex-direction:column;padding-bottom:80px}.header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-lg);padding-top:calc(env(safe-area-inset-top,0px) + var(--spacing-md));background:var(--color-bg-secondary);border-bottom:1px solid rgba(255,255,255,.05);position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header__title{font-size:var(--font-size-xl);font-weight:700;background:var(--color-accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header__back{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-text-secondary);background:none;border:none;font-size:var(--font-size-md);cursor:pointer;transition:color var(--transition-fast)}.header__back:hover{color:var(--color-text-primary)}.stats-banner{display:flex;gap:var(--spacing-md);padding:var(--spacing-lg);overflow-x:auto;scrollbar-width:none}.stats-banner::-webkit-scrollbar{display:none}.stat-card{flex:1;min-width:120px;padding:var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--border-radius-md);border:1px solid rgba(255,255,255,.05)}.stat-card__value{font-size:var(--font-size-2xl);font-weight:700;color:var(--color-accent-primary)}.stat-card__label{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-top:var(--spacing-xs)}.stat-card--streak .stat-card__value{color:var(--color-warning)}.deck-list{padding:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.deck-list__title{font-size:var(--font-size-lg);font-weight:600;margin-bottom:var(--spacing-sm)}.deck-card{background:var(--color-bg-secondary);border-radius:var(--border-radius-lg);padding:var(--spacing-lg);cursor:pointer;transition:all var(--transition-normal);border:1px solid rgba(255,255,255,.05);position:relative;overflow:hidden}.deck-card:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--deck-color, var(--color-accent-primary))}.deck-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:#ffffff1a}.deck-card:active{transform:scale(.98)}.deck-card__header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--spacing-sm)}.deck-card__name{font-size:var(--font-size-lg);font-weight:600}.deck-card__due{background:var(--color-accent-primary);color:#fff;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-sm);font-size:var(--font-size-xs);font-weight:600}.deck-card__due--none{background:var(--color-success)}.deck-card__description{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-bottom:var(--spacing-md)}.deck-card__progress{height:4px;background:#ffffff1a;border-radius:2px;overflow:hidden}.deck-card__progress-bar{height:100%;background:var(--color-accent-gradient);transition:width var(--transition-normal)}.deck-card__stats{display:flex;gap:var(--spacing-lg);margin-top:var(--spacing-sm);font-size:var(--font-size-sm);color:var(--color-text-muted)}.add-deck-btn{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-lg);background:transparent;border:2px dashed rgba(255,255,255,.2);border-radius:var(--border-radius-lg);color:var(--color-text-secondary);font-size:var(--font-size-md);cursor:pointer;transition:all var(--transition-fast)}.add-deck-btn:hover{border-color:var(--color-accent-primary);color:var(--color-accent-primary);background:#6366f11a}.study-container{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-lg);gap:var(--spacing-xl)}.study-progress{width:100%;max-width:400px;text-align:center}.study-progress__text{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-bottom:var(--spacing-sm)}.study-progress__bar{height:6px;background:#ffffff1a;border-radius:3px;overflow:hidden}.study-progress__fill{height:100%;background:var(--color-accent-gradient);transition:width var(--transition-normal)}.flashcard{width:100%;max-width:400px;aspect-ratio:3 / 2;perspective:1000px;cursor:pointer}.flashcard__inner{position:relative;width:100%;height:100%;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.flashcard--flipped .flashcard__inner{transform:rotateY(180deg)}.flashcard__face{position:absolute;width:100%;height:100%;display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl);background:var(--color-bg-card);border-radius:var(--border-radius-xl);border:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow-lg);backface-visibility:hidden;font-size:var(--font-size-xl);text-align:center;line-height:1.4}.flashcard__face--back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--color-bg-card) 0%,#2d2d5a 100%)}.flashcard__label{position:absolute;top:var(--spacing-md);left:var(--spacing-md);font-size:var(--font-size-xs);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:1px}.rating-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm);width:100%;max-width:400px}.rating-btn{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-md);background:var(--color-bg-secondary);border:1px solid rgba(255,255,255,.1);border-radius:var(--border-radius-md);color:var(--color-text-primary);font-size:var(--font-size-sm);cursor:pointer;transition:all var(--transition-fast)}.rating-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.rating-btn:active{transform:scale(.95)}.rating-btn--fail{border-color:#ef44444d}.rating-btn--fail:hover{background:#ef444433;border-color:var(--color-error)}.rating-btn--hard{border-color:#f59e0b4d}.rating-btn--hard:hover{background:#f59e0b33;border-color:var(--color-warning)}.rating-btn--good{border-color:#10b9814d}.rating-btn--good:hover{background:#10b98133;border-color:var(--color-success)}.rating-btn__days{font-size:var(--font-size-xs);color:var(--color-text-muted)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);text-align:center;color:var(--color-text-secondary)}.empty-state__icon{font-size:4rem;margin-bottom:var(--spacing-lg);opacity:.5}.empty-state__title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.empty-state__text{font-size:var(--font-size-sm);margin-bottom:var(--spacing-lg)}.modal-overlay{position:fixed;inset:0;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:var(--spacing-lg);z-index:1000;animation:fadeIn var(--transition-fast)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{width:100%;max-width:480px;max-height:90vh;overflow-y:auto;background:var(--color-bg-secondary);border-radius:var(--border-radius-xl);border:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow-lg);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(--spacing-lg);border-bottom:1px solid rgba(255,255,255,.05)}.modal__title{font-size:var(--font-size-lg);font-weight:600}.modal__close{background:none;border:none;color:var(--color-text-secondary);font-size:var(--font-size-xl);cursor:pointer;padding:var(--spacing-xs);line-height:1;transition:color var(--transition-fast)}.modal__close:hover{color:var(--color-text-primary)}.modal__body{padding:var(--spacing-lg)}.modal__footer{display:flex;gap:var(--spacing-sm);padding:var(--spacing-lg);border-top:1px solid rgba(255,255,255,.05)}.form-group{margin-bottom:var(--spacing-lg)}.form-group__label{display:block;font-size:var(--font-size-sm);font-weight:500;color:var(--color-text-secondary);margin-bottom:var(--spacing-sm)}.form-group__input,.form-group__textarea{width:100%;padding:var(--spacing-md);background:var(--color-bg-primary);border:1px solid rgba(255,255,255,.1);border-radius:var(--border-radius-md);color:var(--color-text-primary);font-size:var(--font-size-md);font-family:inherit;transition:border-color var(--transition-fast)}.form-group__input:focus,.form-group__textarea:focus{outline:none;border-color:var(--color-accent-primary);box-shadow:0 0 0 3px #6366f133}.form-group__textarea{min-height:100px;resize:vertical}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);font-size:var(--font-size-md);font-weight:500;border:none;border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast)}.btn--primary{background:var(--color-accent-gradient);color:#fff}.btn--primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-glow)}.btn--secondary{background:transparent;border:1px solid rgba(255,255,255,.2);color:var(--color-text-primary)}.btn--secondary:hover{background:#ffffff0d;border-color:#ffffff4d}.btn--danger{background:var(--color-error);color:#fff}.btn--danger:hover{background:#dc2626}.btn--full{width:100%}.color-picker{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.color-picker__option{width:32px;height:32px;border-radius:50%;border:2px solid transparent;cursor:pointer;transition:all var(--transition-fast)}.color-picker__option:hover{transform:scale(1.1)}.color-picker__option--selected{border-color:#fff;box-shadow:var(--shadow-glow)}.card-list{padding:var(--spacing-lg)}.card-list__item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--border-radius-md);margin-bottom:var(--spacing-sm);border:1px solid rgba(255,255,255,.05)}.card-list__content{flex:1;min-width:0}.card-list__front{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-list__back{font-size:var(--font-size-sm);color:var(--color-text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-list__actions{display:flex;gap:var(--spacing-xs)}.card-list__action{padding:var(--spacing-sm);background:transparent;border:none;color:var(--color-text-muted);cursor:pointer;border-radius:var(--border-radius-sm);transition:all var(--transition-fast)}.card-list__action:hover{background:#ffffff1a;color:var(--color-text-primary)}.card-list__action--delete:hover{color:var(--color-error)}.study-complete{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);text-align:center}.study-complete__icon{font-size:5rem;margin-bottom:var(--spacing-lg);animation:bounce 1s ease infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.study-complete__title{font-size:var(--font-size-2xl);font-weight:700;background:var(--color-accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--spacing-sm)}.study-complete__stats{display:flex;gap:var(--spacing-xl);margin:var(--spacing-xl) 0}.study-complete__stat{text-align:center}.study-complete__stat-value{font-size:var(--font-size-3xl);font-weight:700;color:var(--color-accent-primary)}.study-complete__stat-label{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.import-section{padding:var(--spacing-lg)}.import-dropzone{border:2px dashed rgba(255,255,255,.2);border-radius:var(--border-radius-lg);padding:var(--spacing-2xl);text-align:center;cursor:pointer;transition:all var(--transition-fast)}.import-dropzone:hover{border-color:var(--color-accent-primary);background:#6366f11a}.import-dropzone__icon{font-size:3rem;margin-bottom:var(--spacing-md);opacity:.5}.import-format{margin-top:var(--spacing-lg);padding:var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--border-radius-md);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.import-format code{display:block;margin-top:var(--spacing-sm);padding:var(--spacing-sm);background:var(--color-bg-primary);border-radius:var(--border-radius-sm);font-family:Monaco,Consolas,monospace;font-size:var(--font-size-xs)}.nav-bar{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:space-around;padding:var(--spacing-md);background:var(--color-bg-secondary);border-top:1px solid rgba(255,255,255,.05);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.nav-bar__item{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm);background:none;border:none;color:var(--color-text-muted);font-size:var(--font-size-xs);cursor:pointer;transition:color var(--transition-fast)}.nav-bar__item:hover,.nav-bar__item--active{color:var(--color-accent-primary)}.nav-bar__icon{font-size:1.5rem}@media(max-width:480px){.rating-buttons{grid-template-columns:repeat(auto-fit,minmax(100px,1fr))}.stat-card{min-width:100px;padding:var(--spacing-sm)}.stat-card__value{font-size:var(--font-size-xl)}}.card-type-selector{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.card-type-btn{flex:1;min-width:100px;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-md);background:var(--color-bg-primary);border:2px solid rgba(255,255,255,.1);border-radius:var(--border-radius-md);color:var(--color-text-secondary);font-size:var(--font-size-sm);cursor:pointer;transition:all var(--transition-fast)}.card-type-btn:hover{border-color:var(--color-accent-primary);color:var(--color-text-primary)}.card-type-btn--active{border-color:var(--color-accent-primary);background:#6366f133;color:var(--color-text-primary)}.card-type-btn__icon{font-size:1.5rem}.true-false-selector{display:flex;gap:var(--spacing-sm)}.tf-btn{flex:1;padding:var(--spacing-lg);background:var(--color-bg-primary);border:2px solid rgba(255,255,255,.1);border-radius:var(--border-radius-md);color:var(--color-text-secondary);font-size:var(--font-size-md);cursor:pointer;transition:all var(--transition-fast)}.tf-btn:hover{border-color:#ffffff4d}.tf-btn--active.tf-btn--true{border-color:var(--color-success);background:#10b98133;color:var(--color-success)}.tf-btn--active.tf-btn--false{border-color:var(--color-error);background:#ef444433;color:var(--color-error)}.options-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.option-item{display:flex;align-items:center;gap:var(--spacing-sm)}.option-radio{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-primary);border:2px solid rgba(255,255,255,.2);border-radius:50%;color:var(--color-text-muted);font-size:var(--font-size-sm);font-weight:600;cursor:pointer;transition:all var(--transition-fast);flex-shrink:0}.option-radio:hover{border-color:var(--color-accent-primary)}.option-radio--selected{background:var(--color-success);border-color:var(--color-success);color:#fff}.question-card{width:100%;max-width:480px;padding:var(--spacing-lg);background:var(--color-bg-card);border-radius:var(--border-radius-xl);border:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow-lg);text-align:center}.question-card__type{display:inline-block;padding:var(--spacing-xs) var(--spacing-sm);background:#6366f133;border-radius:var(--border-radius-sm);font-size:var(--font-size-xs);color:var(--color-accent-primary);margin-bottom:var(--spacing-md)}.question-card__text{font-size:var(--font-size-base);line-height:1.6;max-height:50vh;overflow-y:auto;text-align:left;white-space:pre-wrap;word-break:break-all}.card-table-wrapper{overflow-x:auto;margin:var(--spacing-sm) 0;-webkit-overflow-scrolling:touch}.card-table{border-collapse:collapse;font-size:var(--font-size-sm);width:100%;min-width:max-content}.card-table th,.card-table td{border:1px solid rgba(255,255,255,.15);padding:4px 8px;white-space:nowrap;text-align:center}.card-table th{background:#ffffff14;font-weight:600}.tf-answer-buttons{display:flex;gap:var(--spacing-md);width:100%;max-width:480px}.tf-answer-btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xl);background:var(--color-bg-secondary);border:2px solid rgba(255,255,255,.1);border-radius:var(--border-radius-lg);color:var(--color-text-primary);font-size:var(--font-size-lg);cursor:pointer;transition:all var(--transition-fast)}.tf-answer-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.tf-answer-btn--true:hover{border-color:var(--color-success);background:#10b9811a}.tf-answer-btn--false:hover{border-color:var(--color-error);background:#ef44441a}.tf-answer-btn__icon{font-size:2.5rem}.mc-options{display:flex;flex-direction:column;gap:var(--spacing-sm);width:100%;max-width:480px}.mc-option{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);background:var(--color-bg-secondary);border:2px solid rgba(255,255,255,.1);border-radius:var(--border-radius-md);color:var(--color-text-primary);font-size:var(--font-size-md);text-align:left;cursor:pointer;transition:all var(--transition-fast)}.mc-option:hover:not(:disabled){border-color:var(--color-accent-primary);background:#6366f11a}.mc-option--selected{border-color:var(--color-accent-primary);background:#6366f133}.mc-option--correct{border-color:var(--color-success);background:#10b98133}.mc-option--wrong{border-color:var(--color-error);background:#ef444433}.mc-option__letter{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:#ffffff1a;border-radius:50%;font-weight:600;flex-shrink:0}.mc-option__text{flex:1}.mc-option__check{color:var(--color-success);font-size:var(--font-size-lg)}.answer-result{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md);width:100%;max-width:480px}.answer-result__badge{padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--border-radius-md);font-size:var(--font-size-lg);font-weight:600}.answer-result__badge--correct{background:#10b98133;color:var(--color-success)}.answer-result__badge--wrong{background:#ef444433;color:var(--color-error)}.answer-result__text{color:var(--color-text-secondary);font-size:var(--font-size-sm)}.study-hint{color:var(--color-text-muted);font-size:var(--font-size-sm);text-align:center}.import-exam{display:flex;flex-direction:column;min-height:100vh}.import-exam__header{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);background:var(--color-bg-secondary);border-bottom:1px solid rgba(255,255,255,.05)}.import-exam__header h2{font-size:var(--font-size-lg);font-weight:600}.import-exam__content{flex:1;display:flex;flex-direction:column;gap:var(--spacing-lg);padding:var(--spacing-lg)}.import-exam__info{padding:var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--border-radius-md);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.import-exam__type-select{display:flex;align-items:center;gap:var(--spacing-md)}.import-exam__select{flex:1;padding:var(--spacing-md);background:var(--color-bg-primary);border:1px solid 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