:root{--primary:#6366f1;--primary-dark:#4f46e5;--primary-light:#818cf8;--secondary:#f59e0b;--secondary-dark:#d97706;--html-color:#e34c26;--css-color:#264de4;--project-color:#10b981;--bg-dark:#0f172a;--bg-card:#1e293b;--bg-light:#f8fafc;--text-dark:#1e293b;--text-light:#f8fafc;--text-muted:#94a3b8;--border:#334155;--success:#22c55e;--warning:#eab308;--font-main:"Segoe UI",Tahoma,Geneva,Verdana,sans-serif;--font-code:"Fira Code","Consolas",monospace;--space-xs:0.25rem;--space-sm:0.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--space-3xl:4rem;--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:1rem;--radius-full:9999px;--shadow-sm:0 1px 2px rgba(0,0,0,.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1);--shadow-glow:0 0 20px rgba(99,102,241,.3);--transition:all 0.3s ease}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background:var(--bg-dark);color:var(--text-light);line-height:1.6;min-height:100vh}a{color:var(--primary-light);text-decoration:none;transition:var(--transition)}a:hover{color:var(--primary)}img{max-width:100%;display:block}ol,ul{list-style:none}button{cursor:pointer;font-family:inherit;border:none;background:none}h1,h2,h3,h4,h5,h6{line-height:1.2;font-weight:700}h1{font-size:clamp(2rem,5vw,3rem)}h2{font-size:clamp(1.5rem,4vw,2.25rem)}h3{font-size:clamp(1.25rem,3vw,1.5rem)}p{color:var(--text-muted)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--space-md)}.flex{display:flex}.flex-center{justify-content:center}.flex-between,.flex-center{display:flex;align-items:center}.flex-between{justify-content:space-between}.grid{display:grid}.text-center{text-align:center}.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(15,23,42,.95);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);padding:var(--space-md) 0}.header__inner{justify-content:space-between}.header__inner,.logo{display:flex;align-items:center}.logo{gap:var(--space-sm);font-size:1.5rem;font-weight:700;color:var(--text-light)}.logo__icon{font-size:1.75rem}.logo span{background:linear-gradient(135deg,var(--html-color),var(--css-color));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.nav{display:none}.nav__list{display:flex;gap:var(--space-lg)}.nav__link{color:var(--text-muted);font-weight:500;padding:var(--space-sm) 0;position:relative}.nav__link.active,.nav__link:hover{color:var(--text-light)}.nav__link:after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--primary);transition:var(--transition)}.nav__link.active:after,.nav__link:hover:after{width:100%}.menu-toggle{display:flex;flex-direction:column;gap:5px;padding:var(--space-sm)}.menu-toggle span{display:block;width:25px;height:3px;background:var(--text-light);border-radius:var(--radius-full);transition:var(--transition)}.mobile-nav{position:fixed;top:70px;left:0;right:0;background:var(--bg-dark);border-bottom:1px solid var(--border);padding:var(--space-lg);transform:translateY(-100%);opacity:0;visibility:hidden;transition:var(--transition)}.mobile-nav.active{transform:translateY(0);opacity:1;visibility:visible}.mobile-nav__list{display:flex;flex-direction:column;gap:var(--space-md)}.mobile-nav__link{display:block;padding:var(--space-md);color:var(--text-light);font-size:1.1rem;border-radius:var(--radius-md);transition:var(--transition)}.mobile-nav__link:hover{background:var(--bg-card)}.hero{padding:calc(80px + var(--space-3xl)) 0 var(--space-3xl);text-align:center;background:linear-gradient(180deg,var(--bg-dark) 0,var(--bg-card) 100%);position:relative;overflow:hidden}.hero:before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:600px;height:600px;background:radial-gradient(circle,rgba(99,102,241,.1) 0,transparent 70%);pointer-events:none}.hero__content{position:relative;z-index:1}.hero__badge{display:inline-block;background:rgba(99,102,241,.2);color:var(--primary-light);padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);font-size:.875rem;font-weight:500;border:1px solid rgba(99,102,241,.3)}.hero__badge,.hero__title{margin-bottom:var(--space-lg)}.hero__title span{background:linear-gradient(135deg,var(--html-color),var(--css-color));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.hero__description{font-size:1.125rem;max-width:600px;margin:0 auto var(--space-xl)}.hero__buttons{display:flex;flex-direction:column;gap:var(--space-md);align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-md) var(--space-xl);border-radius:var(--radius-md);font-weight:600;font-size:1rem;transition:var(--transition)}.btn--primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:var(--shadow-md)}.btn--primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow);color:#fff}.btn--secondary{background:transparent;color:var(--text-light);border:2px solid var(--border)}.btn--secondary:hover{border-color:var(--primary);color:var(--primary-light)}.btn--html{background:linear-gradient(135deg,var(--html-color),#ff6b4a);color:#fff;position:relative;overflow:hidden}.btn--html:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);transition:left .5s ease}.btn--html:hover{color:#fff;transform:translateY(-3px);box-shadow:0 8px 25px rgba(227,76,38,.4)}.btn--html:hover:before{left:100%}.btn--css{background:linear-gradient(135deg,var(--css-color),#5c7cfa);color:#fff;position:relative;overflow:hidden}.btn--css:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);transition:left .5s ease}.btn--css:hover{color:#fff;transform:translateY(-3px);box-shadow:0 8px 25px rgba(38,77,228,.4)}.btn--css:hover:before{left:100%}.btn--success{background:var(--success);color:#fff;position:relative;overflow:hidden}.btn--success:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);transition:left .5s ease}.btn--success:hover{color:#fff;transform:translateY(-3px);box-shadow:0 8px 25px rgba(16,185,129,.4)}.btn--success:hover:before{left:100%}.courses{padding:var(--space-3xl) 0}.section-header{text-align:center;margin-bottom:var(--space-2xl)}.section-header p{margin-top:var(--space-sm)}.courses__grid{display:grid;grid-gap:var(--space-lg);gap:var(--space-lg)}.course-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-xl);border:1px solid var(--border);transition:var(--transition);position:relative;overflow:hidden;display:flex;flex-direction:column}.course-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px}.course-card--html:before{background:linear-gradient(90deg,var(--html-color),#ff6b4a)}.course-card--css:before{background:linear-gradient(90deg,var(--css-color),#5c7cfa)}.course-card--projects:before{background:linear-gradient(90deg,var(--project-color),#34d399)}.course-card:hover{transform:translateY(-5px);border-color:var(--primary);box-shadow:var(--shadow-lg)}.course-card__icon{font-size:3rem;margin-bottom:var(--space-md);min-height:70px;display:flex;align-items:center}.course-card--projects .course-card__icon{background:linear-gradient(135deg,var(--project-color),#34d399);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;display:inline-block}.course-card__title{margin-bottom:var(--space-sm)}.course-card__description,.course-card__meta{margin-bottom:var(--space-lg)}.course-card__meta{display:flex;gap:var(--space-md);font-size:.875rem}.course-card__meta span{display:flex;align-items:center;gap:var(--space-xs);color:var(--text-muted)}.course-card .btn{margin-top:auto}.features{padding:var(--space-3xl) 0}.features__grid{display:grid;grid-gap:var(--space-lg);gap:var(--space-lg);margin-top:var(--space-xl)}.feature-card{text-align:center;padding:var(--space-xl);background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border)}.feature-card__icon{font-size:2.5rem;margin-bottom:var(--space-md);background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;display:inline-block}.feature-card h3{margin-bottom:var(--space-sm)}.footer{background:var(--bg-card);padding:var(--space-xl) 0;border-top:1px solid var(--border);text-align:center}.footer p{font-size:.875rem}.footer__heart{color:#ef4444}.lesson-page{padding-top:80px;min-height:100vh}.lesson-header{background:var(--bg-card);padding:var(--space-xl) 0;border-bottom:1px solid var(--border)}.lesson-header__breadcrumb{display:flex;gap:var(--space-sm);margin-bottom:var(--space-md);font-size:.875rem}.lesson-header__breadcrumb a,.lesson-header__breadcrumb span{color:var(--text-muted)}.lesson-number{display:inline-block;background:rgba(99,102,241,.2);color:var(--primary-light);padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);font-size:.875rem;margin-bottom:var(--space-sm)}.lesson-content{padding:var(--space-xl) 0}.lesson-section{margin-bottom:var(--space-2xl)}.lesson-section__header{display:flex;align-items:center;gap:var(--space-sm);margin-bottom:var(--space-md)}.lesson-section__header h2{font-size:1.25rem}.lesson-section__icon{font-size:1.5rem}.code-block{background:#1a1a2e;border-radius:var(--radius-md);overflow:hidden;margin:var(--space-md) 0;border:1px solid var(--border)}.code-block__header{display:flex;justify-content:space-between;align-items:center;padding:var(--space-sm) var(--space-md);background:rgba(0,0,0,.3);border-bottom:1px solid var(--border)}.code-block__lang{text-transform:uppercase}.code-block__copy,.code-block__lang{font-size:.75rem;color:var(--text-muted)}.code-block__copy{padding:var(--space-xs) var(--space-sm);border:1px solid var(--border);border-radius:var(--radius-sm);transition:var(--transition)}.code-block__copy:hover{color:var(--text-light);border-color:var(--primary)}.code-block pre{padding:var(--space-md);overflow-x:auto;font-size:.875rem;line-height:1.7}.code-block code,.code-block pre{font-family:var(--font-code)}.tag{color:#ff79c6}.attr{color:#50fa7b}.value{color:#f1fa8c}.comment{color:#6272a4}.selector{color:#ff79c6}.property{color:#8be9fd}.css-value{color:#f1fa8c}.preview-box{background:#fff;border-radius:var(--radius-md);padding:var(--space-lg);margin:var(--space-md) 0;border:1px solid var(--border)}.preview-box__label{display:block;font-size:.75rem;color:var(--text-muted);margin-bottom:var(--space-sm);text-transform:uppercase}.lang-switcher{display:flex;align-items:center;gap:var(--space-xs);margin-right:var(--space-md)}[dir=rtl] .lang-switcher{margin-right:0;margin-left:var(--space-md)}.lang-btn{padding:var(--space-xs) var(--space-sm);font-size:.875rem;color:var(--text-muted);border:1px solid var(--border);border-radius:var(--radius-sm);background:transparent;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:var(--space-xs)}.lang-btn:hover{border-color:var(--primary);color:var(--primary-light)}.lang-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.lang-divider{color:var(--text-muted);font-size:.875rem}.projects-grid{padding:var(--space-2xl) 0}.project-card{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);transition:var(--transition)}.project-card:hover{transform:translateY(-5px);border-color:var(--project-color);box-shadow:0 10px 40px rgba(16,185,129,.2)}.project-card__image{height:200px;background:linear-gradient(135deg,var(--bg-dark),var(--bg-card));display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}.project-card__image img{width:100%;height:100%;object-fit:cover;transition:var(--transition)}.project-card:hover .project-card__image img{transform:scale(1.05)}.project-card__content{padding:var(--space-lg)}.project-card__title{margin-bottom:var(--space-sm);color:var(--text-light)}.project-card__content p{font-size:.9rem;line-height:1.5;margin-bottom:var(--space-md)}.project-card__tags{display:flex;flex-wrap:wrap;gap:var(--space-sm);margin-top:var(--space-md)}.tag-badge{font-size:.75rem;padding:var(--space-xs) var(--space-sm);background:rgba(99,102,241,.2);color:var(--primary-light);border-radius:var(--radius-sm);border:1px solid rgba(99,102,241,.3)}.lessons-grid{padding:var(--space-2xl) 0}.lessons-list{display:flex;flex-direction:column;gap:var(--space-md)}.lesson-card{display:flex;gap:var(--space-lg);padding:var(--space-lg);background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:var(--transition);align-items:center;cursor:pointer}.lesson-card:hover{border-color:var(--primary);transform:translateX(5px)}.lesson-card__number{width:50px;height:50px;background:var(--bg-dark);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.25rem;flex-shrink:0;border:2px solid var(--border);color:var(--text-light)}.lesson-card__content{flex:1 1}.lesson-card__title{font-size:1.1rem;margin-bottom:var(--space-xs);color:var(--text-light)}.lesson-card__description{font-size:.875rem;color:var(--text-muted)}.lesson-card__arrow{font-size:1.25rem;color:var(--text-muted);transition:var(--transition)}.lesson-card:hover .lesson-card__arrow{color:var(--primary);transform:translateX(5px)}.progress-section{padding:var(--space-2xl) 0}.progress-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-xl);border:1px solid var(--border);margin-bottom:var(--space-lg)}.progress-bar{height:12px;background:var(--bg-dark);border-radius:var(--radius-full);overflow:hidden;margin:var(--space-md) 0}.progress-bar__fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:var(--radius-full);transition:width .5s ease}.progress-bar__fill--html{background:linear-gradient(90deg,var(--html-color),#ff6b4a)}.progress-bar__fill--css{background:linear-gradient(90deg,var(--css-color),#5c7cfa)}.track-header{padding:calc(80px + var(--space-2xl)) 0 var(--space-2xl);text-align:center}.track-header--html{background:linear-gradient(135deg,rgba(227,76,38,.2),transparent)}.track-header--css{background:linear-gradient(135deg,rgba(38,77,228,.2),transparent)}@media (min-width:768px){.nav{display:block}.menu-toggle{display:none}.hero__buttons{flex-direction:row;justify-content:center}.courses__grid,.features__grid,.projects-grid{grid-template-columns:repeat(2,1fr)}}@media (min-width:1024px){.courses__grid{grid-template-columns:repeat(3,1fr)}.features__grid{grid-template-columns:repeat(4,1fr)}.projects-grid{grid-template-columns:repeat(3,1fr)}}[dir=rtl]{direction:rtl}[dir=rtl] .header__inner,[dir=rtl] .nav__list{flex-direction:row-reverse}[dir=rtl] .mobile-nav__list{text-align:right}