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var(--space-3);flex-direction:column;flex:1;gap:2px;display:flex}.sidebar-divider{padding:var(--space-3) var(--space-2) var(--space-2);margin-top:var(--space-2);align-items:center;display:flex}.sidebar-divider span{letter-spacing:.1em;color:var(--text-muted);text-transform:uppercase;font-size:.65rem;font-weight:700}.sidebar-link{align-items:center;gap:var(--space-3);padding:9px var(--space-3);border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition);font-size:.875rem;font-weight:500;text-decoration:none;display:flex;position:relative}.sidebar-link:hover{color:var(--text-primary);background:#ffffff0d}.sidebar-link.active{color:var(--accent-purple);background:linear-gradient(135deg,#7c3aed33,#3b82f626);border:1px solid #8b5cf640}.sidebar-link.active svg{color:var(--accent-purple)}.sidebar-lock{opacity:.6;margin-left:auto;font-size:.7rem}.sidebar-logout{align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-top:1px solid 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p{color:var(--text-secondary);font-size:.9rem}.auth-google-btn{gap:var(--space-3);justify-content:center}.auth-or{align-items:center;gap:var(--space-3);color:var(--text-muted);font-size:.8rem;display:flex}.auth-or-line{background:var(--border);flex:1;height:1px}.auth-form{gap:var(--space-4);flex-direction:column;display:flex}.auth-input-wrap{position:relative}.auth-input-icon{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:12px;transform:translateY(-50%)}.auth-input{padding-left:38px!important}.auth-toggle-pass{color:var(--text-muted);cursor:pointer;transition:color var(--transition);background:0 0;border:none;padding:4px;position:absolute;top:50%;right:12px;transform:translateY(-50%)}.auth-toggle-pass:hover{color:var(--text-primary)}.auth-hint{color:var(--accent-purple);margin-top:4px;font-size:.75rem}.auth-switch{text-align:center;color:var(--text-muted);font-size:.85rem}.auth-switch-btn{color:var(--accent-purple);cursor:pointer;transition:color var(--transition);background:0 0;border:none;padding:0;font-size:.85rem;font-weight:600}.auth-switch-btn:hover{color:var(--accent-blue)}@media (width<=768px){.auth-container{grid-template-columns:1fr}.auth-left{display:none}.auth-right{padding:var(--space-6) var(--space-4);padding-top:var(--space-12);align-items:flex-start}.auth-card{padding:var(--space-6)}.auth-headline{font-size:2rem}}.dashboard-header{justify-content:space-between;align-items:flex-start;gap:var(--space-4);margin-bottom:var(--space-8);flex-wrap:wrap;display:flex}.dashboard-header-badges{align-items:center;gap:var(--space-3);flex-shrink:0;display:flex}.dashboard-stats{gap:var(--space-4);margin-bottom:var(--space-8);grid-template-columns:repeat(3,1fr);display:grid}.dashboard-stat-card{gap:var(--space-3);flex-direction:column;display:flex}.dashboard-stat-top{align-items:center;gap:var(--space-4);display:flex}.dashboard-stat-icon{border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;display:flex}.dashboard-stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.75rem;font-weight:500}.dashboard-stat-value{font-family:var(--font-display);color:var(--text-primary);font-size:1.4rem;font-weight:700}.dashboard-stat-sub{color:var(--text-muted);font-size:.75rem}.credit-bar-track{background:var(--border);border-radius:var(--radius-full);height:4px;overflow:hidden}.credit-bar-fill{background:linear-gradient(90deg, 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(width<=768px){.dashboard-stats,.features-grid,.dashboard-quick-links{grid-template-columns:1fr}.dashboard-header{flex-direction:column;align-items:flex-start}}.dashboard-page-container{padding-top:var(--space-2)!important}.spinner-wrapper{align-items:center;gap:var(--space-3);flex-direction:column;display:flex}.spinner-ring{width:40px;height:40px;display:inline-block;position:relative}.spinner-ring div{box-sizing:border-box;border:3px solid #0000;border-top-color:var(--accent-purple);border-radius:50%;width:100%;height:100%;animation:1.2s cubic-bezier(.5,0,.5,1) infinite spin;display:block;position:absolute}.spinner-ring div:first-child{animation-delay:-.45s}.spinner-ring div:nth-child(2){animation-delay:-.3s}.spinner-ring div:nth-child(3){animation-delay:-.15s}.spinner-sm .spinner-ring{width:24px;height:24px}.spinner-lg .spinner-ring,.spinner-ring.large{width:56px;height:56px}.spinner-ring.large div{border-width:4px}.spinner-text{color:var(--text-secondary);font-size:.85rem}.full-page-loader{background:var(--bg-base);z-index:999;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.full-page-loader-inner{align-items:center;gap:var(--space-4);flex-direction:column;display:flex}.full-page-loader-inner p{color:var(--text-secondary);font-size:1rem}.page-header{align-items:flex-start;gap:var(--space-4);margin-bottom:var(--space-8);display:flex}.page-header-icon{border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:52px;height:52px;display:flex}.page-header-icon.blue{color:#60a5fa;background:#60a5fa1a;border:1px solid #60a5fa33}.page-header-icon.purple{color:#a78bfa;background:#a78bfa1a;border:1px solid #a78bfa33}.page-header-icon.amber{color:#fbbf24;background:#fbbf241a;border:1px solid #fbbf2433}.page-header-icon.green{color:#34d399;background:#34d3991a;border:1px solid #34d39933}.page-header-icon.pink{color:#f472b6;background:#f472b61a;border:1px solid #f472b633}.page-header-icon.cyan{color:#22d3ee;background:#22d3ee1a;border:1px solid #22d3ee33}.feature-layout{gap:var(--space-6);grid-template-columns:380px 1fr;align-items:flex-start;display:grid}.feature-input-card{top:calc(var(--navbar-height) + var(--space-4));position:sticky}.feature-form{gap:var(--space-4);flex-direction:column;display:flex}.feature-credit-info{color:var(--text-muted);padding-top:var(--space-3);border-top:1px solid 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(width<=1024px){.feature-layout{grid-template-columns:1fr}.feature-input-card{position:static}}.flashcard-viewer{gap:var(--space-5);flex-direction:column;align-items:stretch;display:flex}.fc-progress{align-items:center;gap:var(--space-3);color:var(--text-muted);font-size:.8rem;display:flex}.fc-progress-text{color:var(--text-secondary);white-space:nowrap;font-weight:600}.fc-known-text{white-space:nowrap;color:var(--accent-green);font-weight:600}.flip-card{perspective:1200px;cursor:pointer;-webkit-user-select:none;user-select:none;width:100%;min-height:300px}.flip-card-inner{width:100%;height:300px;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.flip-card.flipped .flip-card-inner{transform:rotateY(180deg)}.flip-card-front,.flip-card-back{justify-content:center;align-items:center;gap:var(--space-4);text-align:center;padding:var(--space-8);backface-visibility:hidden;border-radius:var(--radius-lg);border:1px solid var(--border);flex-direction:column;display:flex;position:absolute;inset:0}.flip-card-front{background:var(--bg-card)}.flip-card-back{background:linear-gradient(135deg,#7c3aed26,#3b82f61a);border-color:#8b5cf64d;transform:rotateY(180deg)}.flip-label{letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-full);padding:3px 10px;font-size:.65rem;font-weight:700}.flip-text{font-family:var(--font-display);color:var(--text-primary);font-size:1.15rem;font-weight:600;line-height:1.5}.flip-hint{color:var(--text-muted);bottom:var(--space-4);font-size:.75rem;position:absolute}.fc-controls{justify-content:center;align-items:center;gap:var(--space-3);display:flex}.difficulty-selector{gap:var(--space-2);display:flex}.difficulty-btn{border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-input);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);flex:1;padding:8px;font-size:.85rem;font-weight:600}.difficulty-btn.active{border-color:var(--accent-purple);color:var(--accent-purple);background:#8b5cf626}.quiz-container{gap:var(--space-5);flex-direction:column;max-width:760px;margin:0 auto;display:flex}.quiz-header{justify-content:space-between;align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.quiz-title{font-family:var(--font-display);color:var(--text-primary);margin-bottom:var(--space-1);font-size:1.2rem;font-weight:700}.quiz-progress-label{color:var(--text-muted);font-size:.85rem;font-weight:600}.quiz-questions{gap:var(--space-4);flex-direction:column;display:flex}.quiz-question-card{gap:var(--space-4)}.quiz-question-num{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);font-size:.75rem;font-weight:600}.quiz-question-text{color:var(--text-primary);font-size:1rem;font-weight:500;line-height:1.5}.quiz-options{gap:var(--space-2);flex-direction:column;display:flex}.quiz-option{align-items:center;gap:var(--space-3);padding:12px var(--space-4);border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-input);color:var(--text-secondary);text-align:left;cursor:pointer;transition:all 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