:root{--primary-color:#1a237e;--primary-dark:#283593;--primary-light:#3f51b5;--accent-color:#ffb300;--accent-orange:#f5650a;--bg-light:#f5f7fa;--bg-white:#ffffff;--text-dark:#2c3e50;--text-light:#54657e;--border-color:#e0e6ed;--spacing-small:12px;--spacing-medium:16px;--spacing-large:24px;--spacing-xl:32px;--font-base:16px;--font-small:14px;--font-tiny:12px;--shadow-sm:0 2px 8px rgba(0, 0, 0, 0.08);--shadow-md:0 4px 12px rgba(0, 0, 0, 0.12);--shadow-lg:0 8px 24px rgba(0, 0, 0, 0.15)}html[data-theme=dark]{--bg-light:#0f1419;--bg-white:#1a1f2e;--text-dark:#e8eef7;--text-light:#a0aac0;--border-color:#2d3748}html[data-font-size=small]{--font-base:14px}html[data-font-size=large]{--font-base:18px}html[data-font-size=extra-large]{--font-base:20px}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;font-size:var(--font-base)}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe 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ease;font-weight:500;position:relative;white-space:nowrap;font-size:.9375rem;letter-spacing:.5px}nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:3px;background:var(--accent-color);transition:all .3s ease;transform:translateX(-50%);border-radius:2px}body:not(.hover-effects-disabled) nav a:hover{background-color:rgba(255,255,255,.12)}body:not(.hover-effects-disabled) nav a:hover::after{width:70%}.nav-container{display:flex;align-items:center;width:100%;max-width:1400px;margin:0 auto;padding:0 var(--spacing-medium)}.hamburger-btn{display:none;flex-direction:column;gap:5px;cursor:pointer;background:0 0;border:none;padding:10px;color:#fff;margin-left:auto;margin-right:var(--spacing-small);z-index:1001;border-radius:6px;transition:all .3s ease}body:not(.hover-effects-disabled) .hamburger-btn:hover{background:rgba(255,255,255,.15)}.hamburger-line{width:24px;height:2.5px;background:#fff;border-radius:2px;transition:all .3s ease}.hamburger-btn.active 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var(--border-color)}body:not(.hover-effects-disabled) .menu-section:hover{box-shadow:var(--shadow-md);border-color:var(--accent-color)}.menu-section h2{color:var(--primary-color);margin-bottom:30px;font-size:1.8rem;font-weight:700;border-bottom:3px solid var(--accent-color);padding-bottom:15px;word-wrap:break-word;transition:all .3s ease;letter-spacing:-.5px}.menu-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}.menu-links a{background:linear-gradient(135deg,var(--primary-light) 0,var(--primary-dark) 100%);color:#fff;padding:22px 20px;border-radius:10px;text-decoration:none;transition:all .3s ease;font-weight:600;text-align:center;box-shadow:var(--shadow-sm);display:flex;align-items:center;justify-content:center;min-height:60px;word-wrap:break-word;font-size:1rem;border:2px solid transparent}body:not(.hover-effects-disabled) .menu-links 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h3{font-size:1.9rem;margin-bottom:10px;font-weight:700;word-wrap:break-word;position:relative;z-index:1;letter-spacing:-.5px}.course-level{font-size:.85rem;opacity:.9;font-weight:600;background:rgba(255,255,255,.25);padding:6px 14px;border-radius:20px;display:inline-block;word-wrap:break-word;letter-spacing:.3px;position:relative;z-index:1}.course-content{padding:30px;flex-grow:1;display:flex;flex-direction:column;color:var(--text-light);transition:color .3s ease}.course-content h4{color:var(--primary-color);font-weight:700;margin-top:20px;margin-bottom:12px;font-size:1.1rem;transition:color .3s ease;letter-spacing:-.3px}.course-content h4:first-child{margin-top:0}.course-content p{color:var(--text-light);margin-bottom:15px;line-height:1.8;font-size:.9rem;word-wrap:break-word;overflow-wrap:break-word;transition:color .3s ease}.course-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:25px;padding-top:25px;border-top:2px solid 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.code-block{background:#1a1a1a;border-left-color:var(--accent-orange)}.code-block code{color:#ffb300;font-weight:500}.features-list{list-style:none;margin-top:12px;padding:0}.features-list li{padding:10px 0;padding-left:28px;position:relative;color:var(--text-light);font-size:.9rem;word-wrap:break-word;transition:color .3s ease;line-height:1.6}.features-list li::before{content:'→';position:absolute;left:0;color:var(--accent-color);font-weight:700;font-size:1.1rem;transition:all .3s ease}.settings-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);display:none;z-index:1999;animation:fadeIn .3s ease;backdrop-filter:blur(4px)}.settings-overlay.active{display:block}.settings-panel{position:fixed;right:0;top:0;width:100%;max-width:420px;height:100vh;background:var(--bg-white);box-shadow:-6px 0 24px rgba(0,0,0,.2);overflow-y:auto;z-index:2000;transform:translateX(100%);transition:transform .35s cubic-bezier(.4, 0, .2, 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h3{font-size:1.4rem}.course-content{padding:24px}.course-stats{grid-template-columns:1fr;gap:12px}.curriculum-item{padding:14px;padding-left:38px}.settings-panel{max-width:100%}footer{padding:30px 20px}}@media (min-width:481px) and (max-width:768px){.hamburger-btn{display:none}nav a{padding:13px 14px;font-size:.8rem}nav ul{justify-content:space-around}.header{padding:60px 20px}.header h1{font-size:2.5rem}.header p{font-size:1.1rem}.menu-links{grid-template-columns:repeat(2,1fr);gap:15px}.courses-grid{grid-template-columns:1fr;gap:25px}.course-stats{grid-template-columns:repeat(3,1fr)}.container{padding:40px 20px}.settings-panel{max-width:380px}}@media (min-width:769px){.hamburger-btn{display:none!important}nav ul{position:static;display:flex;background:0 0;box-shadow:none;padding:0 var(--spacing-medium)}nav a{padding:14px 20px;font-size:.95rem}.header h1{font-size:3.5rem}.header p{font-size:1.3rem}.menu-links{grid-template-columns:repeat(4,1fr)}.courses-grid{grid-template-columns:repeat(auto-fit,minmax(360px,1fr))}.container{padding:60px 30px}}@media (min-width:1200px){.container{padding:70px 40px}nav a{padding:14px 24px}.courses-grid{grid-template-columns:repeat(auto-fit,minmax(380px,1fr));gap:35px}.menu-section{padding:50px}}@media (max-width:768px) and (orientation:landscape){.header{padding:40px 20px}.header h1{font-size:1.8rem;margin-bottom:8px}.header p{font-size:.95rem}nav a{padding:10px 12px;font-size:.75rem}}@media (hover:none) and (pointer:coarse){nav a:active{background-color:rgba(255,255,255,.15)}.menu-links a:active{transform:scale(.98)}.course-card:active{transform:translateY(-5px)}.stat:active{background:rgba(63,81,181,.1)}}@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}@media print{.hamburger-btn,.settings-btn,.settings-overlay,.settings-panel,footer,nav{display:none}.header{page-break-after:avoid}.course-card{page-break-inside:avoid}}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--bg-light)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--primary-light)}html[data-theme=dark] ::-webkit-scrollbar-thumb{background:var(--primary-light)}html[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:var(--accent-color)}