:root{--primary:#5E35B1;--primary-variant:#4527A0;--secondary:#26A69A;--secondary-variant:#00897B;--background:#F5F7FA;--surface:#FFFFFF;--error:#E57373;--on-primary:#FFFFFF;--on-secondary:#FFFFFF;--on-background:#37474F;--on-surface:#37474F;--on-error:#FFFFFF;--gray-50:#FAFAFA;--gray-100:#F5F5F5;--gray-200:#EEEEEE;--gray-300:#E0E0E0;--gray-400:#BDBDBD;--gray-500:#9E9E9E;--gray-600:#757575;--gray-700:#546E7A;--gray-800:#455A64;--gray-900:#263238;--success:#66BB6A;--warning:#FFA726;--info:#42A5F5;--elevation-0:none;--elevation-1:0 1px 3px rgba(0,0,0,0.12),0 1px 2px rgba(0,0,0,0.24);--elevation-2:0 3px 6px rgba(0,0,0,0.16),0 3px 6px rgba(0,0,0,0.23);--elevation-4:0 10px 20px rgba(0,0,0,0.19),0 6px 6px rgba(0,0,0,0.23);--elevation-6:0 14px 28px rgba(0,0,0,0.25),0 10px 10px rgba(0,0,0,0.22);--elevation-8:0 19px 38px rgba(0,0,0,0.30),0 15px 12px rgba(0,0,0,0.22);--elevation-24:0 24px 38px rgba(0,0,0,0.14),0 9px 46px rgba(0,0,0,0.12),0 11px 15px 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1)}body.dark-mode{--primary:#B39DDB;--primary-variant:#7E57C2;--secondary:#80CBC4;--background:#1A1A2E;--surface:#252540;--error:#EF9A9A;--on-primary:#000000;--on-background:#E8E8E8;--on-surface:#E8E8E8;--success:#81C784;--warning:#FFB74D;--info:#64B5F6;--gray-700:#90A4AE;--gray-800:#78909C}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family-ar);background-color:var(--background);color:var(--on-background);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.start-screen-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,var(--primary) 0,var(--primary-variant) 100%);z-index:9999;display:flex;align-items:center;justify-content:center;opacity:1;transition:opacity var(--transition-normal)}.start-screen-overlay.hide{opacity:0;pointer-events:none}.start-screen-content{text-align:center;color:#fff;padding:var(--spacing-xl);animation:fadeIn .5s 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.material-icons{font-size:28px}.elevation-0{box-shadow:var(--elevation-0)}.elevation-1{box-shadow:var(--elevation-1)}.elevation-2{box-shadow:var(--elevation-2)}.elevation-4{box-shadow:var(--elevation-4)}.elevation-6{box-shadow:var(--elevation-6)}.elevation-8{box-shadow:var(--elevation-8)}.elevation-24{box-shadow:var(--elevation-24)}.ripple{position:relative;overflow:hidden;cursor:pointer}.ripple::after{content:'';position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:rgba(255,255,255,.4);transform:translate(-50%,-50%);transition:width .6s,height .6s}.ripple:active::after{width:300px;height:300px}.mdc-top-app-bar{background-color:var(--primary);color:var(--on-primary);box-shadow:var(--elevation-4);position:sticky;top:0;z-index:100}.app-bar-row{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md);min-height:56px}.app-bar-section{display:flex;align-items:center;gap:var(--spacing-md)}.app-bar-title{font-size:1.25rem;font-weight:500;font-family:var(--font-family-ar)}.mdc-icon-button{width:48px;height:48px;border:none;background:0 0;border-radius:var(--radius-full);cursor:pointer;display:flex;align-items:center;justify-content:center;color:inherit;transition:background-color var(--transition-fast)}.mdc-icon-button:hover{background-color:rgba(255,255,255,.1)}.mdc-icon-button:active{background-color:rgba(255,255,255,.2)}.material-icons{font-size:24px;user-select:none}.progress-indicator{height:4px;background-color:rgba(255,255,255,.2);overflow:hidden}.progress-bar{height:100%;background-color:var(--secondary);width:0%;transition:width var(--transition-normal)}.main-container{max-width:1200px;margin:0 auto;padding:var(--spacing-lg)}.stats-section{display:flex;justify-content:center;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.stat-card{background-color:var(--surface);border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md);display:flex;align-items:center;gap:var(--spacing-sm);transition:transform var(--transition-fast);flex:1;max-width:180px}.stat-card:hover{transform:translateY(-1px)}.stat-icon-wrapper{width:32px;height:32px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;flex-shrink:0}.stat-icon-wrapper .material-icons{font-size:18px}.stat-new .stat-icon-wrapper{background-color:rgba(66,165,245,.12);color:var(--info)}.stat-learning .stat-icon-wrapper{background-color:rgba(255,167,38,.12);color:var(--warning)}.stat-review 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var(--transition-normal);transform-style:preserve-3d;min-height:450px}.flashcard.flipped{transform:rotateY(180deg)}.card-face{position:absolute;top:0;left:0;width:100%;backface-visibility:hidden;padding:var(--spacing-md);display:flex;flex-direction:column;min-height:450px}.card-front{transform:rotateY(0)}.card-back{transform:rotateY(180deg)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-sm)}.category-chip{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-md);background-color:var(--gray-100);border-radius:var(--radius-full);font-size:.875rem;font-weight:500}.category-chip.success{background-color:rgba(76,175,80,.1);color:var(--success)}.icon-btn{width:40px;height:40px;border:none;background:0 0;border-radius:var(--radius-full);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--gray-600);transition:all 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0;color:var(--primary);font-size:.9375rem;font-weight:600;font-family:var(--font-family-ar);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.mdc-text-button:hover{background-color:rgba(94,53,177,.08);transform:translateY(-1px)}.mdc-text-button:active{background-color:rgba(94,53,177,.12);transform:translateY(0)}.explanation-wrapper{margin-top:var(--spacing-md);padding:var(--spacing-sm) var(--spacing-md);background-color:var(--gray-50);border-radius:var(--radius-md);border-right:3px solid 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100%);border-color:var(--warning)}.rating-good{border-color:var(--success);color:var(--success);background:linear-gradient(135deg,rgba(102,187,106,.05) 0,rgba(102,187,106,.02) 100%)}.rating-good:hover{background:linear-gradient(135deg,rgba(102,187,106,.15) 0,rgba(102,187,106,.08) 100%);border-color:var(--success)}.rating-easy{border-color:var(--info);color:var(--info);background:linear-gradient(135deg,rgba(66,165,245,.05) 0,rgba(66,165,245,.02) 100%)}.rating-easy:hover{background:linear-gradient(135deg,rgba(66,165,245,.15) 0,rgba(66,165,245,.08) 100%);border-color:var(--info)}.rating-label{font-weight:600;font-size:.9375rem}.start-section{display:flex;justify-content:center;align-items:center;min-height:300px}.mdc-raised-button{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);border:none;border-radius:var(--radius-sm);font-size:.9375rem;font-weight:500;font-family:var(--font-family-ar);cursor:pointer;box-shadow:var(--elevation-2);transition:all var(--transition-fast)}.mdc-raised-button.primary{background-color:var(--primary);color:var(--on-primary)}.mdc-raised-button:hover{box-shadow:var(--elevation-4);transform:translateY(-1px)}.mdc-raised-button:active{box-shadow:var(--elevation-8);transform:translateY(0)}.mdc-fab{position:fixed;bottom:var(--spacing-lg);left:var(--spacing-lg);width:56px;height:56px;border:none;border-radius:var(--radius-full);background-color:var(--secondary);color:var(--on-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);z-index:50}.mdc-fab:hover{transform:scale(1.1)}.mdc-fab:active{transform:scale(.95)}.mdc-snackbar{position:fixed;bottom:-100px;left:50%;transform:translateX(-50%);z-index:200;transition:bottom var(--transition-normal)}.mdc-snackbar.show{bottom:var(--spacing-lg)}.snackbar-surface{background-color:var(--gray-800);color:#fff;border-radius:var(--radius-sm);padding:var(--spacing-sm) var(--spacing-md);box-shadow:var(--elevation-6);display:flex;align-items:center;gap:var(--spacing-md);min-width:300px;max-width:600px}.snackbar-label{flex:1;font-size:.875rem}.snackbar-action{border:none;background:0 0;color:var(--secondary);font-weight:600;font-size:.875rem;cursor:pointer;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm);font-family:var(--font-family-ar)}.snackbar-action:hover{background-color:rgba(3,218,198,.1)}.dialog-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.5);z-index:300;display:none;align-items:center;justify-content:center;opacity:0;transition:opacity var(--transition-normal)}.dialog-overlay.show{display:flex;opacity:1}.mdc-dialog{background-color:var(--surface);border-radius:var(--radius-lg);width:90%;max-width:500px;max-height:80vh;overflow:hidden;display:flex;flex-direction:column;transform:scale(.8);transition:transform var(--transition-normal)}.dialog-overlay.show .mdc-dialog{transform:scale(1)}.dialog-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-lg);border-bottom:1px solid var(--gray-200)}.dialog-title{font-size:1.25rem;font-weight:600}.dialog-content{flex:1;overflow-y:auto;padding:var(--spacing-lg)}.setting-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md) 0;border-bottom:1px solid var(--gray-100)}.setting-item:last-child{border-bottom:none}.setting-text{flex:1}.setting-title{font-weight:500;margin-bottom:var(--spacing-xs)}.setting-subtitle{font-size:.875rem;color:var(--gray-600)}.mdc-text-field{width:80px;padding:var(--spacing-sm);border:1px solid var(--gray-300);border-radius:var(--radius-sm);font-size:1rem;font-family:var(--font-family-en);text-align:center}.mdc-text-field:focus{outline:0;border-color:var(--primary)}.mdc-switch{position:relative;width:52px;height:32px;cursor:pointer}.switch-input{opacity:0;width:0;height:0}.switch-track{position:absolute;top:0;left:0;right:0;bottom:0;background-color:var(--gray-400);border-radius:var(--radius-full);transition:background-color var(--transition-fast)}.switch-thumb{position:absolute;top:4px;right:4px;width:24px;height:24px;background-color:#fff;border-radius:var(--radius-full);transition:transform var(--transition-fast);box-shadow:var(--elevation-1)}.switch-input:checked+.switch-track{background-color:var(--primary)}.switch-input:checked+.switch-track+.switch-thumb{transform:translateX(-20px)}.dialog-actions{display:flex;justify-content:flex-end;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);border-top:1px solid var(--gray-200)}@media (max-width:768px){.main-container{padding:var(--spacing-md)}.stats-section{flex-wrap:wrap}.stat-card{max-width:150px}.app-bar-title{font-size:1.125rem}.text-spanish p{font-size:1.125rem}.text-arabic p{font-size:1.25rem}.rating-buttons{gap:var(--spacing-xs)}.rating-btn{max-width:120px;min-width:90px;padding:var(--spacing-xs) var(--spacing-sm)}.rating-label{font-size:.8125rem}.navigation-buttons{gap:var(--spacing-sm)}.nav-btn{max-width:150px;padding:var(--spacing-xs) var(--spacing-md);font-size:.875rem}.timer-badge{padding:4px 8px;font-size:.8125rem}.timer-badge .material-icons{font-size:16px}.mdc-fab{bottom:var(--spacing-md);left:var(--spacing-md)}}@media (max-width:480px){.app-bar-row{padding:var(--spacing-sm)}.main-container{padding:var(--spacing-sm)}.stats-section{gap:var(--spacing-xs)}.stat-card{max-width:100%;padding:var(--spacing-xs) var(--spacing-sm)}.stat-value{font-size:1.25rem}.stat-label{font-size:.7rem}.flashcard{min-height:350px}.card-face{min-height:350px;padding:var(--spacing-md)}.rating-buttons{gap:4px}.rating-btn{flex-direction:column;max-width:none;min-width:70px;padding:var(--spacing-xs)}.rating-btn .material-icons{font-size:18px}.rating-label{font-size:.75rem}.navigation-buttons{flex-direction:column;gap:var(--spacing-xs)}.nav-btn{max-width:100%;width:100%}.timer-badge{padding:3px 6px;font-size:.75rem}.timer-badge .material-icons{font-size:14px}}@keyframes slideIn{from{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes slideOut{from{transform:translateY(0);opacity:1}to{transform:translateY(100%);opacity:0}}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes scaleIn{from{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}.bilingual-text{display:flex;flex-direction:column;gap:var(--spacing-md)}.text-arabic,.text-spanish{display:flex;flex-direction:column;gap:var(--spacing-xs)}.text-spanish p{font-size:1.25rem;font-weight:500;line-height:1.6;color:var(--on-surface)}.text-arabic p{font-size:1.375rem;font-weight:600;line-height:1.7;color:var(--on-surface);direction:rtl}.lang-badge{display:inline-flex;align-items:center;justify-content:center;padding:4px 12px;border-radius:var(--radius-full);font-size:.75rem;font-weight:700;font-family:var(--font-family-en);background-color:var(--gray-200);color:var(--gray-700)}.lang-badge.success{background-color:rgba(102,187,106,.15);color:var(--success)}.lang-badge.error{background-color:rgba(229,115,115,.15);color:var(--error)}.lang-badge.info{background-color:rgba(66,165,245,.15);color:var(--info)}.bilingual-answer{display:flex;flex-direction:column;gap:var(--spacing-md)}.correct-answer-block{background:linear-gradient(135deg,rgba(102,187,106,.08) 0,rgba(102,187,106,.03) 100%);border:2px solid rgba(102,187,106,.3);border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md)}.answer-header,.wrong-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm);font-weight:600;font-size:.9375rem}.answer-header{color:var(--success)}.answer-header 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