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a{color:var(--color-text-secondary);transition:color var(--transition-fast)}.site-footer__nav-list a:hover,.site-footer__social-list a:hover{color:var(--color-primary)}.site-footer__bottom{padding-top:var(--spacing-xl);border-top:1px solid var(--color-border);text-align:center}.site-footer__copyright{color:var(--color-text-secondary);font-size:var(--font-size-sm)}@layer reset,base,layout,components,utilities;@layer reset{*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;-moz-tab-size:4;tab-size:4}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}img,picture,video,canvas,svg{display:block;max-width:100%}button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}button{cursor:pointer;border:none;background:none}a{color:inherit;text-decoration:none}ul,ol{list-style:none}}:root{--color-primary: #3b82f6;--color-primary-dark: #2563eb;--color-primary-light: #60a5fa;--color-secondary: #8b5cf6;--color-accent: #10b981;--color-warning: #f59e0b;--color-danger: #ef4444;--color-bg: #ffffff;--color-bg-secondary: #f9fafb;--color-bg-tertiary: #f3f4f6;--color-bg-dark: #111827;--color-text: #111827;--color-text-secondary: #6b7280;--color-text-light: #9ca3af;--color-text-inverse: #ffffff;--color-border: #e5e7eb;--color-border-light: #f3f4f6;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--spacing-4xl: 6rem;--font-family-base: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-family-heading: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--font-size-5xl: 3rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height-tight: 1.25;--line-height-normal: 1.5;--line-height-relaxed: 1.75;--container-width: 1200px;--container-padding: var(--spacing-md);--border-radius-sm: .25rem;--border-radius-md: .5rem;--border-radius-lg: .75rem;--border-radius-xl: 1rem;--border-radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .35s ease}@media(prefers-color-scheme:dark){:root{--color-bg: #111827;--color-bg-secondary: #1f2937;--color-bg-tertiary: #374151;--color-text: #f9fafb;--color-text-secondary: #d1d5db;--color-text-light: #9ca3af;--color-border: #374151;--color-border-light: #4b5563}}@layer base{html{scroll-behavior:smooth}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}body{background-color:var(--color-bg);color:var(--color-text);font-family:var(--font-family-base);font-size:var(--font-size-base);line-height:var(--line-height-normal);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-family:var(--font-family-heading);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);color:var(--color-text)}h1{font-size:var(--font-size-4xl)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-2xl)}h4{font-size:var(--font-size-xl)}p{margin-bottom:var(--spacing-md)}a{transition:color var(--transition-fast)}a:focus-visible,button:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}a:hover{color:var(--color-primary)}img{height:auto}}@layer layout{.container{width:100%;max-width:var(--container-width);margin-left:auto;margin-right:auto;padding-left:var(--container-padding);padding-right:var(--container-padding)}.section{padding-top:var(--spacing-4xl);padding-bottom:var(--spacing-4xl)}.section--small{padding-top:var(--spacing-2xl);padding-bottom:var(--spacing-2xl)}.grid{display:grid;gap:var(--spacing-lg)}.grid--2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.grid--3{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.grid--4{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}@media(max-width:768px){.grid--2,.grid--3,.grid--4{grid-template-columns:1fr}}.flex{display:flex}.flex--column{flex-direction:column}.flex--center{align-items:center;justify-content:center}.flex--between{justify-content:space-between}.flex--wrap{flex-wrap:wrap}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.gap-xl{gap:var(--spacing-xl)}}@layer components{.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);font-weight:var(--font-weight-medium);border-radius:var(--border-radius-md);transition:all var(--transition-base);text-align:center}.btn--primary{background-color:var(--color-primary);color:var(--color-text-inverse)}.btn--primary:hover{background-color:var(--color-primary-dark)}.btn--secondary{background-color:var(--color-bg-secondary);color:var(--color-text);border:1px solid var(--color-border)}.btn--secondary:hover{background-color:var(--color-bg-tertiary)}.btn--large{padding:var(--spacing-md) var(--spacing-xl);font-size:var(--font-size-lg)}.card{background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);padding:var(--spacing-lg);transition:all var(--transition-base)}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.card__header{margin-bottom:var(--spacing-md)}.card__title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);margin-bottom:var(--spacing-sm)}.card__body{color:var(--color-text-secondary)}.skip-link{position:absolute;top:-100px;left:0;z-index:1000;padding:var(--spacing-sm) var(--spacing-md);background-color:var(--color-primary);color:var(--color-text-inverse);border-radius:var(--border-radius-md)}.skip-link:focus{top:0}.other-videos-section{background-color:var(--color-bg-secondary)}.other-videos-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.other-videos-list__item{background-color:var(--color-bg);border-radius:var(--border-radius-md);transition:all var(--transition-base)}.other-videos-list__item:hover{box-shadow:var(--shadow-sm);transform:translate(4px)}.other-videos-list__link{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg)}.other-videos-list__category{display:inline-flex;align-items:center;justify-content:center;min-width:60px;padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);text-transform:uppercase;background-color:var(--color-primary);color:var(--color-text-inverse);border-radius:var(--border-radius-sm)}.other-videos-list__title{flex:1;font-weight:var(--font-weight-medium);color:var(--color-text)}.other-videos-list__duration{font-size:var(--font-size-sm);color:var(--color-text-secondary)}@media(max-width:640px){.other-videos-list__link{flex-wrap:wrap}.other-videos-list__title{flex-basis:100%;order:3;margin-top:var(--spacing-sm)}}.section__title{font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);margin-bottom:var(--spacing-xl)}.breadcrumb-nav{padding:var(--spacing-lg) 0}.breadcrumb-nav__list{display:flex;flex-wrap:wrap;align-items:center;gap:var(--spacing-xs);list-style:none;padding:0;margin:0}.breadcrumb-nav__item{display:flex;align-items:center;gap:var(--spacing-xs)}.breadcrumb-nav__link{color:var(--color-primary);font-size:var(--font-size-sm);transition:color var(--transition-fast)}.breadcrumb-nav__link:hover{color:var(--color-primary-dark);text-decoration:underline}.breadcrumb-nav__separator{color:var(--color-text-light);font-size:var(--font-size-sm);margin:0 var(--spacing-xs)}.breadcrumb-nav__current{color:var(--color-text-secondary);font-size:var(--font-size-sm)}}@layer utilities{.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.mt-xl{margin-top:var(--spacing-xl)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.mb-xl{margin-bottom:var(--spacing-xl)}}.about-page__header{text-align:center;margin-bottom:var(--spacing-3xl)}.about-page__header h1{margin-bottom:var(--spacing-sm)}.about-page__subtitle{font-size:var(--font-size-lg);color:var(--color-text-secondary)}.about-page__content{max-width:800px;margin:0 auto}.about-page__bio{margin-bottom:var(--spacing-2xl)}.about-page__bio h2{margin-bottom:var(--spacing-lg)}.about-page__bio p{font-size:var(--font-size-lg);line-height:var(--line-height-relaxed);margin-bottom:var(--spacing-md);color:var(--color-text-secondary)}.about-page__stats{display:flex;justify-content:center;gap:var(--spacing-2xl);padding:var(--spacing-xl) 0;margin-bottom:var(--spacing-2xl);border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border)}.about-page__stat{text-align:center}.about-page__stat-value{display:block;font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--color-primary)}.about-page__stat-label{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.about-page__topics{margin-bottom:var(--spacing-2xl)}.about-page__topics h3{margin-bottom:var(--spacing-md)}.about-page__topics-list{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.about-page__topic{display:inline-block;padding:var(--spacing-xs) var(--spacing-md);background-color:var(--color-bg-secondary);border-radius:var(--border-radius-full);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.about-page__social{margin-bottom:var(--spacing-2xl)}.about-page__social h3{margin-bottom:var(--spacing-md)}.about-page__social-links{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}@media(max-width:768px){.about-page__stats{flex-direction:column;gap:var(--spacing-lg)}}.video-detail__header{margin-bottom:var(--spacing-2xl)}.video-detail__meta{display:flex;flex-wrap:wrap;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-md);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.video-detail__duration,.video-detail__date{display:inline-block}.video-detail__title{font-size:var(--font-size-4xl);line-height:var(--line-height-tight)}.video-detail__video{margin-bottom:var(--spacing-3xl)}.video-detail__content{max-width:800px;margin:0 auto}.video-detail__description,.video-detail__section{margin-bottom:var(--spacing-2xl)}.video-detail__description h2,.video-detail__section h2{font-size:var(--font-size-2xl);margin-bottom:var(--spacing-md)}.video-detail__description p,.video-detail__section p{line-height:var(--line-height-relaxed);color:var(--color-text-secondary);margin-bottom:var(--spacing-md)}.video-detail__description ul,.video-detail__section ul{list-style:disc;margin-left:var(--spacing-lg);color:var(--color-text-secondary)}.video-detail__description li,.video-detail__section li{margin-bottom:var(--spacing-sm);line-height:var(--line-height-relaxed)}.video-detail__section a{color:var(--color-primary);transition:color var(--transition-fast)}.video-detail__section a:hover{color:var(--color-primary-dark)}.video-detail__actions{display:flex;flex-wrap:wrap;gap:var(--spacing-md);margin-top:var(--spacing-3xl);padding-top:var(--spacing-2xl);border-top:1px solid var(--color-border)}@media(max-width:768px){.video-detail__title{font-size:var(--font-size-2xl)}}