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var(--transition-base);cursor:pointer}.series-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.series-card-image{height:160px;background:var(--gradient-primary);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.series-card-image img{width:100%;height:100%;object-fit:cover}.series-card-image .placeholder-icon{color:#fff9}.series-card-image .placeholder-icon svg{width:48px;height:48px}.series-card-body{padding:var(--space-5)}.series-card-title{font-size:var(--font-size-lg);font-weight:700;margin-bottom:var(--space-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.series-card-desc{font-size:var(--font-size-sm);color:var(--color-text-secondary);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:var(--space-4)}.series-card-footer{padding:0 var(--space-5) var(--space-5)}.content-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-5);display:flex;align-items:center;gap:var(--space-4);transition:all var(--transition-base)}.content-card:hover{box-shadow:var(--shadow-sm)}.content-card-icon{width:44px;height:44px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.content-card-icon svg{width:22px;height:22px;color:#fff}.content-card-body{flex:1;min-width:0}.content-card-title{font-weight:600;margin-bottom:var(--space-1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.content-card-meta{font-size:var(--font-size-xs);color:var(--color-text-secondary)}.content-card-actions{display:flex;gap:var(--space-2);flex-shrink:0}.quiz-question-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);margin-bottom:var(--space-4)}.quiz-question-label{font-size:var(--font-size-sm);font-weight:700;color:var(--color-publisher);margin-bottom:var(--space-3)}.quiz-question-text{font-size:var(--font-size-md);font-weight:600;margin-bottom:var(--space-4);line-height:1.6}.quiz-option{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);border:2px solid var(--color-border);border-radius:var(--radius-md);margin-bottom:var(--space-2);cursor:pointer;transition:all var(--transition-fast)}.quiz-option:hover,.quiz-option.selected{border-color:var(--color-primary);background:var(--color-primary-50)}.quiz-option.correct{border-color:var(--color-success);background:var(--color-success-bg)}.quiz-option.incorrect{border-color:var(--color-error);background:var(--color-error-bg)}.quiz-option-radio{width:20px;height:20px;border:2px solid var(--color-border);border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all var(--transition-fast)}.quiz-option.selected .quiz-option-radio{border-color:var(--color-primary);background:var(--color-primary)}.quiz-option.selected .quiz-option-radio:after{content:"";width:8px;height:8px;border-radius:50%;background:#fff}.quiz-option-text{flex:1;font-size:var(--font-size-sm)}.chat-container{display:flex;flex-direction:column;height:calc(100vh - 140px)}.chat-messages{flex:1;overflow-y:auto;padding:var(--space-6);display:flex;flex-direction:column;gap:var(--space-4)}.chat-bubble{max-width:80%;padding:var(--space-4) var(--space-5);border-radius:var(--radius-lg);font-size:var(--font-size-sm);line-height:1.6;animation:fadeInUp .2s ease}.chat-bubble-user{align-self:flex-end;background:var(--gradient-dark);color:#fff;border-bottom-right-radius:var(--radius-sm)}.chat-bubble-ai{align-self:flex-start;background:var(--color-surface);border:1px solid var(--color-border);border-bottom-left-radius:var(--radius-sm)}.chat-bubble-time{font-size:10px;opacity:.6;margin-top:var(--space-2)}.chat-input-bar{padding:var(--space-4) var(--space-6);border-top:1px solid var(--color-border);background:var(--color-surface);display:flex;gap:var(--space-3);align-items:center}.chat-input{flex:1;padding:var(--space-3) var(--space-4);border:2px solid var(--color-border);border-radius:var(--radius-full);outline:none;font-size:var(--font-size-sm);transition:border-color var(--transition-fast)}.chat-input:focus{border-color:var(--color-primary)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--color-bg);position:relative;overflow:hidden}.login-bg-shapes{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden;pointer-events:none}.login-bg-shapes .shape{position:absolute;border-radius:50%;opacity:.1}.login-bg-shapes .shape-1{width:400px;height:400px;background:var(--color-primary);top:-10%;right:-5%;animation:float 6s ease-in-out infinite}.login-bg-shapes .shape-2{width:300px;height:300px;background:var(--color-accent);bottom:-5%;left:-3%;animation:float 8s ease-in-out infinite reverse}.login-bg-shapes .shape-3{width:200px;height:200px;background:var(--color-primary);top:40%;left:20%;animation:float 7s ease-in-out infinite 1s}.login-container{width:100%;max-width:440px;padding:var(--space-4);z-index:1}.login-card{background:#ffffffd9;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border:1px solid rgba(255,255,255,.6);border-radius:var(--radius-xl);padding:var(--space-10);box-shadow:var(--shadow-xl);animation:scaleIn var(--transition-spring) forwards}.login-logo{text-align:center;margin-bottom:var(--space-8)}.login-logo-icon{width:72px;height:72px;background:var(--gradient-primary);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;margin:0 auto var(--space-4);box-shadow:var(--shadow-glow)}.login-logo-icon svg{width:40px;height:40px;color:#fff}.login-app-name{font-size:var(--font-size-3xl);font-weight:800;color:var(--color-text);letter-spacing:-1px}.login-app-subtitle{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-top:var(--space-1)}.login-divider{display:flex;align-items:center;gap:var(--space-4);margin:var(--space-6) 0;color:var(--color-text-tertiary);font-size:var(--font-size-sm)}.login-divider:before,.login-divider:after{content:"";flex:1;height:1px;background:var(--color-border)}.login-footer{text-align:center;margin-top:var(--space-6);font-size:var(--font-size-xs);color:var(--color-text-tertiary)}.google-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:var(--space-3);padding:var(--space-3) var(--space-6);background:#fff;border:2px solid var(--color-border);border-radius:var(--radius-md);font-weight:600;font-size:var(--font-size-sm);color:var(--color-text);cursor:pointer;transition:all var(--transition-fast)}.google-btn:hover{border-color:var(--color-text-tertiary);box-shadow:var(--shadow-sm)}.fab{position:fixed;bottom:var(--space-8);right:var(--space-8);width:56px;height:56px;border-radius:var(--radius-full);background:var(--gradient-primary);border:none;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-lg),var(--shadow-glow);cursor:pointer;transition:all var(--transition-base);z-index:var(--z-dropdown);animation:bounceIn .6s ease}.fab:hover{transform:scale(1.1);box-shadow:var(--shadow-xl),var(--shadow-glow)}.fab svg{width:24px;height:24px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-1{gap:var(--space-1)}.gap-2{gap:var(--space-2)}.gap-3{gap:var(--space-3)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.gap-8{gap:var(--space-8)}.flex-1{flex:1}.flex-wrap{flex-wrap:wrap}.flex-shrink-0{flex-shrink:0}.w-full{width:100%}.text-center{text-align:center}.text-right{text-align:right}.font-bold{font-weight:700}.font-semibold{font-weight:600}.font-medium{font-weight:500}.text-xs{font-size:var(--font-size-xs)}.text-sm{font-size:var(--font-size-sm)}.text-lg{font-size:var(--font-size-lg)}.text-xl{font-size:var(--font-size-xl)}.text-2xl{font-size:var(--font-size-2xl)}.text-muted{color:var(--color-text-secondary)}.text-primary{color:var(--color-primary-dark)}.text-error{color:var(--color-error)}.text-success{color:var(--color-success)}.mb-2{margin-bottom:var(--space-2)}.mb-4{margin-bottom:var(--space-4)}.mb-6{margin-bottom:var(--space-6)}.mb-8{margin-bottom:var(--space-8)}.mt-2{margin-top:var(--space-2)}.mt-4{margin-top:var(--space-4)}.mt-6{margin-top:var(--space-6)}.p-4{padding:var(--space-4)}.p-6{padding:var(--space-6)}.truncate{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bg-primary{background:var(--gradient-primary)}.bg-purple{background:var(--gradient-purple)}.bg-green{background:var(--gradient-green)}.bg-blue{background:var(--gradient-blue)}.bg-dark{background:var(--gradient-dark)}.bg-accent{background:var(--color-accent)}.border-t{border-top:1px solid var(--color-border)}.border-b{border-bottom:1px solid var(--color-border)}.rounded-lg{border-radius:var(--radius-lg)}.rounded-xl{border-radius:var(--radius-xl)}.rounded-full{border-radius:var(--radius-full)}@media(max-width:1024px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}.page-content{padding:var(--space-6)}}@media(max-width:768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay.visible{display:block}.main-content{margin-left:0}.menu-toggle{display:block}.topbar{padding:var(--space-3) var(--space-4)}.page-content{padding:var(--space-4)}.grid-2,.grid-3,.grid-4,.action-grid{grid-template-columns:1fr}.series-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}.stats-grid{grid-template-columns:repeat(2,1fr)}.welcome-card{padding:var(--space-6)}.welcome-title{font-size:var(--font-size-2xl)}.modal{margin:var(--space-4);max-height:calc(100vh - 2rem)}.login-card{padding:var(--space-6)}.chat-bubble{max-width:90%}.fab{bottom:var(--space-4);right:var(--space-4)}}@media(max-width:480px){.stats-grid{grid-template-columns:1fr}.welcome-meta,.content-card{flex-direction:column;align-items:flex-start}.content-card-actions{align-self:flex-end}}