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6rem;padding:calc(var(--spacing-4xl) + 70px) 0 var(--spacing-4xl) 0;position:relative}.hero-section:before{animation:float 20s ease-in-out infinite;background:url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><rect width="100%" height="100%" fill="url(%23grain)"/></svg>');bottom:0;content:"";left:0;position:absolute;right:0;top:0}.hero-content{align-items:center;color:var(--gemini-primary-text);display:flex;gap:4rem;gap:var(--spacing-3xl);margin:0 auto;max-width:1200px;padding:0 1.5rem;padding:0 var(--spacing-lg);position:relative;z-index:1}.hero-main{flex:2 1;text-align:left}.hero-sidebar{align-items:flex-end;display:flex;flex:1 1;flex-direction:column;gap:2rem;gap:var(--spacing-xl)}.hero-title{color:var(--gemini-primary-text);font-size:3rem;font-size:var(--font-size-5xl);font-weight:800;font-weight:var(--font-weight-extrabold);line-height:1.1;margin-bottom:1.5rem;margin-bottom:var(--spacing-lg);text-shadow:0 2px 4px #0000004d}.hero-description{color:var(--gemini-secondary-text);font-size:1.25rem;font-size:var(--font-size-xl);font-weight:400;font-weight:var(--font-weight-normal);line-height:1.75;line-height:var(--line-height-relaxed);margin-bottom:3rem;margin-bottom:var(--spacing-2xl)}.text-gradient{background:linear-gradient(135deg,#fbbf24,#f59e0b)}.hero-cta{display:flex;gap:1.5rem;gap:var(--spacing-lg);margin-top:3rem;margin-top:var(--spacing-2xl)}.hero-cta .modern-button--primary{background:var(--gemini-card-bg);border:2px solid var(--gemini-primary-text);box-shadow:0 10px 15px -3px #0006,0 4px 6px -4px #0000004d;box-shadow:var(--shadow-lg);color:var(--gemini-accent-blue);font-weight:600;font-weight:var(--font-weight-semibold)}.hero-cta .modern-button--primary:hover{background:var(--gemini-surface-elevated);box-shadow:0 20px 25px -5px #0006,0 8px 10px -6px #0000004d;box-shadow:var(--shadow-xl);transform:translateY(-2px)}.hero-cta .modern-button--ghost{background:#0000;border:2px solid 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#0000004d;box-shadow:var(--shadow-md);color:var(--gemini-primary-text);transform:translateY(-2px)}.courses-grid{grid-gap:3rem;grid-gap:var(--spacing-2xl);display:grid;gap:3rem;gap:var(--spacing-2xl);grid-template-columns:repeat(auto-fill,minmax(350px,1fr));height:auto;margin-top:3rem;margin-top:var(--spacing-2xl);overflow:visible;padding-bottom:6rem;padding-bottom:var(--spacing-4xl)}.course-card{background:var(--gemini-card-bg);border:1px solid var(--gemini-border-color);border-radius:1rem;border-radius:var(--radius-xl);box-shadow:0 1px 2px 0 #0000004d;box-shadow:var(--shadow-sm);transform:translateY(0) scale(1);transition:all .4s cubic-bezier(.4,0,.2,1)}.course-card:before{background:linear-gradient(90deg,var(--gemini-card-bg),var(--gemini-surface-elevated));content:"";height:4px;left:0;position:absolute;right:0;top:0;transform:scaleX(0);transform-origin:left;transition:transform .5s 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#0000004d;box-shadow:var(--shadow-md);color:var(--gemini-primary-text);color:var(--primary-text);height:3rem;width:3rem}.course-icon,.course-title{font-size:1.25rem;font-size:var(--font-size-xl)}.course-title{font-weight:700;font-weight:var(--font-weight-bold);line-height:1.25;line-height:var(--line-height-tight);margin-bottom:.5rem;margin-bottom:var(--spacing-sm)}.course-description{font-size:1rem;font-size:var(--font-size-base);line-height:var(--line-height-normal);margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.difficulty-badge{border-radius:var(--radius-full);font-size:.75rem;font-size:var(--font-size-xs);font-weight:600;font-weight:var(--font-weight-semibold);letter-spacing:.05em;padding:.25rem .5rem;padding:var(--spacing-xs) var(--spacing-sm);text-transform:uppercase}.difficulty-badge--success{background:#34d3991a;background:var(--success-bg);color:#34d399;color:var(--success-text)}.difficulty-badge--warning{background:#fbbf241a;background:var(--warning-bg);color:#fbbf24;color:var(--warning-text)}.difficulty-badge--error{background:#f871711a;background:var(--error-bg);color:#f87171;color:var(--error-text)}.course-meta{border-top:1px solid var(--gemini-border-color);display:flex;gap:1.5rem;gap:var(--spacing-lg);margin-top:1.5rem;margin-top:var(--spacing-lg);padding-top:1.5rem;padding-top:var(--spacing-lg)}.meta-item{align-items:center;color:var(--gemini-secondary-text);display:flex;font-size:.875rem;font-size:var(--font-size-sm);font-weight:500;font-weight:var(--font-weight-medium);gap:.25rem;gap:var(--spacing-xs)}.meta-item svg{height:16px;width:16px}.course-progress{border-top:1px solid 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span{color:var(--gemini-secondary-text);font-size:.875rem;font-size:var(--font-size-sm);font-weight:500;font-weight:var(--font-weight-medium)}.empty-state,.error-state,.loading-state{align-items:center;display:flex;flex-direction:column;justify-content:center;min-height:400px;padding:4rem;padding:var(--spacing-3xl);text-align:center}.loading-spinner{margin-bottom:2rem}.empty-icon,.error-icon{font-size:4rem;margin-bottom:1.5rem;margin-bottom:var(--spacing-lg)}.empty-state h3,.error-state h2,.loading-state h2{color:var(--gemini-primary-text);font-weight:700;font-weight:var(--font-weight-bold);margin-bottom:1rem;margin-bottom:var(--spacing-md)}.empty-state p,.error-state p,.loading-state p{color:var(--gemini-secondary-text);font-size:1.125rem;font-size:var(--font-size-lg);line-height:1.5;line-height:var(--line-height-normal);margin-bottom:2rem;margin-bottom:var(--spacing-xl);max-width:400px}@media (max-width:1024px){.courses-grid{gap:2rem;gap:var(--spacing-xl);grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}}@media (max-width:768px){.khan-hero-section{padding:calc(3rem + 70px) 0 3rem;padding:calc(var(--spacing-2xl) + 70px) 0 var(--spacing-2xl) 0}.hero-content{flex-direction:column;gap:3rem;gap:var(--spacing-2xl);padding:0 1rem;padding:0 var(--spacing-md)}.hero-content,.hero-main{text-align:center}.hero-sidebar{align-items:center;width:100%}.hero-title{font-size:2.25rem;font-size:var(--font-size-4xl);line-height:1.1;margin-bottom:1rem;margin-bottom:var(--spacing-md)}.hero-description{font-size:1.125rem;font-size:var(--font-size-lg);line-height:1.5;margin-bottom:2rem;margin-bottom:var(--spacing-xl)}.hero-cta{gap:1rem;gap:var(--spacing-md)}.hero-cta,.hero-stats{flex-wrap:wrap;justify-content:center}.hero-stats{margin:2rem 1rem 0;margin:var(--spacing-xl) var(--spacing-md) 0;padding:1.5rem;padding:var(--spacing-lg)}.courses-grid,.hero-stats{gap:1.5rem;gap:var(--spacing-lg)}.courses-grid{grid-template-columns:1fr}.search-section{gap:1.5rem;gap:var(--spacing-lg);padding:0 1rem;padding:0 var(--spacing-md)}.filters{justify-content:center}.course-meta,.filters{gap:.5rem;gap:var(--spacing-sm)}.course-meta{flex-direction:column}.course-card{margin:0 1rem;margin:0 var(--spacing-md)}}@media (max-width:480px){.hero-title{font-size:1.875rem;font-size:var(--font-size-3xl);line-height:1.1;margin-bottom:1rem;margin-bottom:var(--spacing-md)}.hero-description{font-size:1rem;font-size:var(--font-size-base);line-height:1.6;padding:0 .5rem;padding:0 var(--spacing-sm)}.hero-stats{flex-direction:column;gap:1.5rem;gap:var(--spacing-lg);margin:2rem .5rem 0;margin:var(--spacing-xl) var(--spacing-sm) 0}.hero-stats,.stat-item{padding:1rem;padding:var(--spacing-md)}.stat-item{min-width:120px}.courses-section{padding:3rem .5rem;padding:var(--spacing-2xl) 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100%)}.course-card{background:#fff;background:var(--gray-800);border-color:var(--gray-200)}.course-card:hover{border-color:var(--primary-color)}.course-meta{border-top-color:var(--gray-200)}}.course-card{overflow:hidden;position:relative}.course-card:after{background:linear-gradient(90deg,#0000,#fff3,#0000);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .8s cubic-bezier(.4,0,.2,1);width:100%;z-index:1}.course-card:hover:after{left:100%}.course-card{will-change:transform,box-shadow}.course-card:focus-visible{outline:2px solid var(--gemini-secondary-text);outline:2px solid var(--primary-color);outline-offset:4px;transform:translateY(-4px)}.course-card.course-card--new{animation:newCourseGlow 2s ease-in-out infinite}@keyframes newCourseGlow{0%,to{box-shadow:0 1px 2px 0 #0000004d;box-shadow:var(--shadow-sm)}50%{box-shadow:0 0 20px #2563eb4d}}.hero-section:after{animation:float 6s ease-in-out 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var(--transition-normal)}.quick-stat:hover{background:var(--gemini-surface-elevated);transform:scale(1.02)}.quick-stat-number{color:var(--gemini-primary-text);font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);margin-bottom:var(--spacing-xs)}.quick-stat-label{color:var(--gemini-secondary-text);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.profile-main{display:flex;flex-direction:column;gap:var(--spacing-2xl)}.edit-form-card{background:var(--gemini-card-bg);border:1px solid var(--gemini-border-color)}.card-header-content{align-items:center;display:flex;justify-content:space-between;width:100%}.edit-actions{align-items:center;display:flex;gap:var(--spacing-sm)}.profile-form{display:flex;flex-direction:column;gap:var(--spacing-xl)}.alert{align-items:center;border-radius:var(--radius-md);display:flex;font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);gap:var(--spacing-sm);margin-bottom:var(--spacing-lg);padding:var(--spacing-md) var(--spacing-lg)}.alert--error{background:var(--error-light);border:1px solid var(--error-color);color:var(--error-color)}.alert--success{background:var(--success-light);border:1px solid var(--success-color);color:var(--success-color)}.alert--error:before{content:"⚠"}.alert--success:before{content:"✓"}.statistics-card{background:var(--gemini-card-bg);border:1px solid var(--gemini-border-color)}.statistics-header{background:var(--gemini-card-bg);border-radius:var(--radius-xl) var(--radius-xl) 0 0;color:var(--gemini-primary-text);padding:var(--spacing-xl)}.statistics-header .modern-card__title{color:var(--gemini-primary-text);font-size:var(--font-size-2xl);margin-bottom:var(--spacing-sm)}.statistics-header .modern-card__description{color:var(--gemini-secondary-text);margin:0}.statistics-body{padding:0}.loading-state{align-items:center;display:flex;flex-direction:column;justify-content:center;min-height:400px;padding:var(--spacing-3xl);text-align:center}.loading-spinner{border-top:4px solid var(--gemini-border-color);border:4px solid var(--gemini-border-color);border-top-color:var(--gemini-accent-blue);height:3rem;margin-bottom:var(--spacing-xl);width:3rem}.loading-state h2{color:var(--gemini-primary-text);margin-bottom:var(--spacing-md)}@media (max-width:1200px){.profile-content{gap:var(--spacing-2xl);grid-template-columns:300px 1fr}}@media (max-width:968px){.profile-content{gap:var(--spacing-xl);grid-template-columns:1fr}.profile-sidebar{grid-gap:var(--spacing-lg);display:grid;gap:var(--spacing-lg);grid-template-columns:1fr 1fr;position:static}.profile-card{grid-column:1/-1}}@media (max-width:768px){.modern-profile-page{padding:var(--spacing-xl) 0}.profile-header-content h1{font-size:var(--font-size-3xl)}.profile-header-content p{font-size:var(--font-size-base)}.profile-sidebar{display:flex;flex-direction:column}.profile-content,.profile-sidebar{gap:var(--spacing-lg)}.card-header-content{align-items:flex-start;flex-direction:column;gap:var(--spacing-md)}.edit-actions{justify-content:flex-end;width:100%}}@media (max-width:480px){.profile-header{margin-bottom:var(--spacing-2xl)}.profile-header-content h1{font-size:var(--font-size-2xl)}.avatar-circle{font-size:var(--font-size-xl);height:4rem;width:4rem}.profile-stats{padding:var(--spacing-md)}.quick-stats{gap:var(--spacing-md)}.edit-actions{flex-direction:column;gap:var(--spacing-sm)}.edit-actions .modern-button{width:100%}}.edit-form-card,.profile-card,.quick-stats-card,.statistics-card{transition:all var(--transition-normal)}.edit-form-card:hover,.profile-card:hover,.quick-stats-card:hover{box-shadow:var(--shadow-xl);transform:translateY(-2px)}.modern-profile-page:before{animation:float 8s ease-in-out infinite;background:var(--gradient-secondary);height:60px;right:5%;top:10%;width:60px}.modern-profile-page:after,.modern-profile-page:before{border-radius:50%;content:"";opacity:.1;position:fixed;z-index:-1}.modern-profile-page:after{animation:float 6s ease-in-out infinite reverse;background:var(--gradient-success);bottom:20%;height:40px;left:10%;width:40px}@keyframes float{0%,to{transform:translateY(0) rotate(0deg)}50%{transform:translateY(-20px) rotate(180deg)}}.chat-tab-container{background:var(--gemini-dark-bg);bottom:0;display:flex;flex-direction:column;left:0;overflow:hidden;position:fixed;right:0;top:70px;z-index:10}.chat-tab-header{flex-shrink:0;padding:var(--spacing-lg) var(--spacing-lg) 0;text-align:center}.chat-tab-header h2{color:var(--gemini-primary-text);font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);margin:0 0 var(--spacing-md) 0}.chat-tab-header p{color:var(--gemini-secondary-text);font-size:var(--font-size-lg);line-height:var(--line-height-relaxed);margin:0 auto;max-width:600px}.chat-tab-loading{align-items:center;display:flex;flex-direction:column;gap:var(--spacing-lg);height:400px;justify-content:center}.anonymous-chat-container{background:var(--gemini-card-bg);border:1px solid var(--gemini-border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);display:flex;flex:1 1;margin:0 auto var(--spacing-lg);max-width:800px;min-height:0;overflow:hidden;width:100%}.anonymous-chat-container:has(.admin-chat-sidebar){max-width:1100px}.chat-loading{align-items:center;display:flex;flex-direction:column;gap:var(--spacing-lg);height:400px;justify-content:center}.loading-spinner{border-top:3px solid var(--gray-200);border:3px solid var(--gray-200);border-top-color:var(--primary-color);height:2rem;width:2rem}.admin-chat-sidebar{background:var(--gemini-dark-bg);border-right:1px solid var(--gemini-border-color);display:flex;flex-direction:column;overflow:hidden;width:350px}.chat-sidebar-header{background:var(--gemini-card-bg);border-bottom:1px solid var(--gemini-border-color);padding:var(--spacing-xl)}.chat-sidebar-header h3{color:var(--gemini-primary-text);font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);margin:0 0 var(--spacing-sm) 0}.admin-chats-list{flex:1 1;overflow-y:auto;padding:var(--spacing-sm)}.admin-chat-item{background:var(--gemini-card-bg);border:1px solid var(--gemini-border-color);border-radius:var(--radius-lg);cursor:pointer;margin-bottom:var(--spacing-sm);padding:var(--spacing-lg);transition:all var(--transition-normal)}.admin-chat-item:hover{transform:translateY(-1px)}.admin-chat-item.active,.admin-chat-item:hover{border-color:var(--gemini-accent-blue);box-shadow:var(--shadow-md)}.admin-chat-item.active{background:var(--gemini-surface-elevated)}.chat-item-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:var(--spacing-sm)}.chat-title{color:var(--gemini-primary-text);font-size:var(--font-size-base);font-weight:var(--font-weight-semibold)}.unread-badge{background:var(--error-bg);border-radius:var(--radius-full);color:var(--error-text);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);min-width:20px;padding:var(--spacing-xs) var(--spacing-sm);text-align:center}.chat-item-details{align-items:center;display:flex;justify-content:space-between;margin-bottom:var(--spacing-sm)}.student-email{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.last-activity,.student-email{color:var(--gemini-secondary-text)}.last-activity{font-size:var(--font-size-xs)}.last-message{background:var(--gemini-surface-elevated);border-radius:var(--radius-md);color:var(--gemini-secondary-text);font-size:var(--font-size-sm);margin-top:var(--spacing-sm);padding:var(--spacing-sm)}.chat-main{display:flex;flex:1 1;flex-direction:column;overflow:hidden}.chat-header{align-items:center;background:var(--gemini-card-bg);border-bottom:1px solid var(--gemini-border-color);display:flex;justify-content:space-between;padding:var(--spacing-xl)}.chat-header .chat-title h3{color:var(--gemini-primary-text);font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);margin:0}.chat-header .chat-title p{color:var(--gemini-secondary-text);font-size:var(--font-size-sm);margin:var(--spacing-xs) 0 0 0}.connection-status{align-items:center;color:var(--gray-200);display:flex;font-size:var(--font-size-sm);gap:var(--spacing-sm)}.status-indicator{background:var(--gray-400);border-radius:50%;height:8px;transition:background-color var(--transition-fast);width:8px}.status-indicator.connected{background:var(--success-color);box-shadow:0 0 0 2px #10b98133}.status-indicator.disconnected{background:var(--error-color);box-shadow:0 0 0 2px #ef444433}.chat-messages{background:var(--gemini-dark-bg);display:flex;flex:1 1;flex-direction:column;gap:var(--spacing-md);overflow-y:auto;padding:var(--spacing-lg)}.message{align-items:flex-end;animation:messageSlideIn .3s 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var(--spacing-xl)}.modern-button--lg{font-size:var(--font-size-lg);min-height:3.5rem;padding:var(--spacing-lg) var(--spacing-2xl)}.modern-button--primary{background:var(--gemini-accent-blue);box-shadow:0 4px 15px #8ab4f859;color:#0d1117;font-weight:var(--font-weight-semibold)}.modern-button--primary:hover:not(.modern-button--disabled):not(.modern-button--loading){background:var(--primary-light);box-shadow:0 8px 25px #8ab4f880;color:#0d1117;transform:translateY(-2px)}.modern-button--primary:active{box-shadow:var(--shadow-md);transform:translateY(0)}.modern-button--secondary{background:var(--gemini-card-bg);border:2px solid 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.modern-button__text{opacity:0}.modern-button__icon{align-items:center;display:flex;font-size:1.2em;justify-content:center}.modern-button__text{position:relative;transition:opacity var(--transition-fast);z-index:1}.modern-button__spinner{left:50%;position:absolute;top:50%;transform:translate(-50%,-50%);z-index:2}.spinner{animation:spin 1s linear infinite;border:2px solid #0000;border-radius:50%;border-top-color:currentcolor;height:1.2em;width:1.2em}.modern-button:focus-visible{box-shadow:0 0 0 3px #8ab4f833;outline:3px solid var(--gemini-accent-blue);outline-offset:3px}.modern-button[aria-pressed=true]{background:var(--primary-dark);transform:translateY(1px)}.modern-button[aria-expanded=true]:after{border:2px solid var(--primary-color);border-radius:inherit;bottom:-2px;content:"";left:-2px;opacity:.5;position:absolute;right:-2px;top:-2px}@media (max-width:768px){.modern-button--lg{font-size:var(--font-size-base);min-height:3rem;padding:var(--spacing-md) 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var(--transition-normal)}.modern-card,.modern-card--default,.modern-card--gradient,.modern-card--primary{background:var(--gemini-card-bg)}.modern-card--primary{color:var(--gemini-dark-bg)}.modern-card--secondary{background:var(--gemini-surface-elevated);color:var(--gemini-primary-text)}.modern-card--success{background:var(--success-bg);color:var(--success-text)}.modern-card--glass{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#1e1f20cc;border:2px solid var(--gemini-accent-blue)}.modern-card--padding-none{padding:0}.modern-card--padding-sm{padding:var(--spacing-md)}.modern-card--padding-md{padding:var(--spacing-xl)}.modern-card--padding-lg{padding:var(--spacing-2xl)}.modern-card--hover:hover{box-shadow:0 20px 40px -10px #00000026;transform:translateY(-6px) scale(1.01);transition:all .4s cubic-bezier(.4,0,.2,1)}.modern-card--clickable{cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1)}.modern-card--clickable:hover{box-shadow:0 15px 30px -5px #0000001f;transform:translateY(-4px) scale(1.005)}.modern-card--clickable:active{box-shadow:var(--shadow-md);transform:translateY(-1px) scale(1.002);transition-duration:.15s}.modern-card--clickable:focus-visible{outline:2px solid var(--primary-color);outline-offset:4px;transform:translateY(-2px)}.modern-card__header{border-bottom:1px solid var(--dark-border);margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-md)}.modern-card__body{flex:1 1}.modern-card__footer{align-items:center;border-top:1px solid var(--dark-border);display:flex;gap:var(--spacing-md);justify-content:space-between;margin-top:var(--spacing-md);padding-top:var(--spacing-md)}.modern-card__title{color:var(--gemini-primary-text);font-family:var(--font-family-heading);font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);line-height:var(--line-height-tight);margin:0 0 var(--spacing-sm) 0}.modern-card__description{color:var(--gemini-secondary-text);font-size:var(--font-size-base);font-weight:var(--font-weight-normal);line-height:var(--line-height-relaxed);margin:0}.modern-card--primary .modern-card__title{color:var(--gemini-dark-bg)}.modern-card--secondary .modern-card__title,.modern-card--success .modern-card__title{color:var(--gemini-primary-text)}.modern-card--primary .modern-card__description{color:var(--gemini-dark-bg);opacity:.8}.modern-card--secondary .modern-card__description,.modern-card--success .modern-card__description{color:var(--gemini-secondary-text)}.modern-card--primary .modern-card__header,.modern-card--secondary .modern-card__header,.modern-card--success .modern-card__header{border-bottom-color:var(--gemini-border-color)}.modern-card--primary .modern-card__footer,.modern-card--secondary .modern-card__footer,.modern-card--success 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.modern-input__icon--right:hover{color:var(--gemini-primary-text)}.modern-input:focus~.modern-input__icon{color:var(--gemini-accent-blue)}.modern-input--error:focus+.modern-input__icon{color:var(--error-color)}.modern-input__error{align-items:center;color:var(--error-text);display:flex;font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);gap:var(--spacing-xs)}.modern-input__error:before{content:"⚠️";font-size:.9em}.modern-input__hint{color:var(--gemini-secondary-text);font-size:var(--font-size-sm);font-weight:var(--font-weight-normal)}.modern-input-wrapper{animation:fadeInUp .3s 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.modern-input:not(:placeholder-shown)+.modern-input__label{color:var(--gemini-accent-blue);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);left:var(--spacing-md);top:0}.modern-input__loading{color:var(--primary-text);font-size:.8rem;font-weight:700;left:50%;position:absolute;top:50%;transform:translate(-50%,-50%)}.modern-header{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#131314f2;border-bottom:1px solid var(--gemini-border-color);left:0;position:fixed;right:0;top:0;transition:all var(--transition-normal);z-index:1000}.modern-header--scrolled{background:#131314fa;border-bottom-color:var(--gemini-border-color);box-shadow:var(--shadow-lg)}.modern-header__content{align-items:center;display:flex;justify-content:space-between;min-height:70px;padding:var(--spacing-md) 0}.modern-header__logo{align-items:center;display:flex;gap:var(--spacing-md);text-decoration:none;transition:all 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