:root{--primary: #5d5fef;--primary-dark: #4042dd;--primary-light: #8c8dff;--secondary: #ff9f1c;--secondary-dark: #f08700;--accent: #00c2ff;--success: #21d19f;--error: #ff4766;--warning: #ffbd12;--text-primary: #1a1e35;--text-secondary: #4e5d78;--text-tertiary: #8a94a6;--text-light: #ffffff;--bg-main: #ffffff;--bg-light: #f8f9fc;--bg-card: #ffffff;--bg-dark: #1a1e35;--bg-accent: rgba(93, 95, 239, .05);--border-color: #eef2f6;--border-radius: 12px;--box-shadow: 0 10px 30px rgba(0, 0, 0, .04);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .05);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .08);--font-heading: "Inter", system-ui, sans-serif;--font-body: "Inter", system-ui, sans-serif;--line-height-body: 1.7;--line-height-heading: 1.3;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-xxl: 3rem;--max-width: 1200px;--content-padding: 1.5rem}body{font-family:var(--font-body);line-height:var(--line-height-body);margin:0;padding:0;background-color:var(--bg-main);color:var(--text-primary);font-size:16px;font-weight:400;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}.site-header{background-color:var(--bg-main);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--border-color);padding:1rem var(--content-padding);transition:all .3s cubic-bezier(.25,.1,.25,1)}.site-header.scrolled{padding:.8rem var(--content-padding);box-shadow:var(--shadow-sm);border-bottom-color:transparent}.header-container{display:flex;align-items:center;justify-content:space-between;max-width:var(--max-width);margin:0 auto;position:relative}.logo-link{text-decoration:none;display:flex;align-items:center;transition:transform .3s ease}.logo-link:hover{transform:translateY(-1px)}.logo{display:flex;align-items:center;gap:.75rem}.logo-icon{display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary-light));width:40px;height:40px;border-radius:10px;box-shadow:0 4px 12px #5d5fef33;position:relative;overflow:hidden}.logo-icon:after{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at top right,rgba(255,255,255,.3),transparent 60%)}.site-title{font-size:1.5rem;margin:0;font-weight:700;color:var(--text-primary);font-family:var(--font-heading);letter-spacing:-.01em}.site-title .accent{background-image:linear-gradient(90deg,var(--primary),var(--secondary));background-clip:text;-webkit-background-clip:text;color:transparent;margin-left:4px;position:relative}.site-title .accent:after{content:"";position:absolute;bottom:2px;left:0;width:100%;height:4px;background-color:var(--primary-light);border-radius:2px;opacity:.3;z-index:-1}.main-nav{display:flex;align-items:center}.nav-list{display:flex;list-style:none;padding:0;margin:0 1.5rem;gap:.5rem}.nav-item{position:relative}.nav-link{display:flex;align-items:center;position:relative;padding:.75rem 1rem;color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:.95rem;border-radius:8px;transition:all .2s cubic-bezier(.25,1,.5,1);overflow:hidden}.nav-text{position:relative;z-index:2}.nav-link:hover{color:var(--primary)}.nav-link:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background-color:var(--bg-accent);opacity:0;transition:opacity .2s ease;z-index:1}.nav-link:hover:before{opacity:1}.nav-indicator{position:absolute;bottom:-1px;left:1rem;right:1rem;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:3px 3px 0 0;transform-origin:bottom;z-index:2}.nav-link.active{color:var(--primary);font-weight:600}.nav-right{display:flex;align-items:center;gap:1rem}.theme-toggle{background:none;border:none;color:var(--text-secondary);width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1rem;transition:all .2s ease}.theme-toggle:hover{background-color:var(--bg-accent);color:var(--primary)}.cta-button{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;padding:.6rem 1.25rem;border-radius:8px;font-weight:600;font-size:.95rem;cursor:pointer;box-shadow:0 4px 12px #5d5fef33;transition:all .2s ease;position:relative;overflow:hidden}.cta-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .6s ease}.cta-button:hover{transform:translateY(-2px);box-shadow:0 6px 16px #5d5fef4d}.cta-button:hover:before{left:100%}.mobile-menu-toggle{display:none;background:none;border:none;width:40px;height:40px;border-radius:8px;position:relative;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:6px;transition:background-color .2s ease}.mobile-menu-toggle:hover{background-color:var(--bg-accent)}.hamburger-line{display:block;width:24px;height:2px;background-color:var(--text-primary);border-radius:2px;transition:all .3s ease}.nav-icon{margin-right:.5rem}.nav-link:hover .nav-icon{transform:translateY(-2px)}.mobile-menu-toggle{display:none;background:none;border:none;color:var(--text-primary);font-size:1.25rem;cursor:pointer;padding:.5rem;border-radius:var(--border-radius);transition:all .3s ease}.mobile-menu-toggle:hover{color:var(--primary);background-color:#4361ee14}.mobile-nav{position:fixed;bottom:0;left:0;width:100%;background-color:var(--bg-main);box-shadow:0 -4px 20px #0000000d;transform:translateY(100%);transition:transform .3s cubic-bezier(.25,1,.5,1);z-index:99;border-radius:20px 20px 0 0;overflow:hidden}.mobile-nav.active{transform:translateY(0)}.mobile-nav-container{display:flex;justify-content:space-around;padding:1.25rem 1rem;max-width:500px;margin:0 auto}.mobile-nav-link{display:flex;flex-direction:column;align-items:center;gap:.5rem;color:var(--text-tertiary);text-decoration:none;font-size:.85rem;font-weight:500;transition:all .2s ease}.mobile-nav-link i{font-size:1.25rem}.mobile-nav-link.active,.mobile-nav-link:hover{color:var(--primary)}@media (max-width: 900px){.main-nav,.cta-button{display:none}.mobile-menu-toggle{display:flex}.mobile-nav{display:block}}nav a:after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background-color:var(--primary);transition:width .3s ease}nav a:hover{color:var(--primary)}nav a:hover:after,nav a.active:after{width:100%}nav a.active{color:var(--primary);font-weight:600}main{max-width:var(--max-width);margin:0 auto;padding:var(--spacing-xxl) var(--content-padding);width:100%;box-sizing:border-box}section{margin-bottom:var(--spacing-xxl);animation:fadeIn .5s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);line-height:var(--line-height-heading);color:var(--text-primary);font-weight:700;letter-spacing:-.01em;margin-top:0}h1{font-size:clamp(2rem,5vw,2.75rem);margin-bottom:var(--spacing-xl)}h2{font-size:clamp(1.8rem,4vw,2.25rem);margin-bottom:var(--spacing-xl);position:relative;padding-bottom:var(--spacing-sm)}h2:after{content:"";position:absolute;left:0;bottom:0;width:60px;height:4px;background-color:var(--secondary);border-radius:4px;transition:width .3s ease}h2:hover:after{width:100px}h3{font-size:clamp(1.3rem,3vw,1.75rem);margin:var(--spacing-xxl) 0 var(--spacing-lg)}h4{font-size:clamp(1.1rem,2vw,1.3rem);margin:var(--spacing-xl) 0 var(--spacing-md)}p{margin:0 0 var(--spacing-lg);color:var(--text-secondary);font-size:1.05rem;max-width:70ch}ul,ol{padding-left:var(--spacing-xl);margin-bottom:var(--spacing-lg);color:var(--text-secondary)}li{margin-bottom:var(--spacing-xs)}table{width:100%;border-collapse:separate;border-spacing:0;margin-bottom:2rem;border-radius:var(--border-radius);overflow:hidden;box-shadow:var(--box-shadow)}th,td{padding:1rem;text-align:left;border-bottom:1px solid var(--border-color)}th{background-color:var(--primary);color:#fff;font-weight:600;letter-spacing:.03em;text-transform:uppercase;font-size:.9rem}td{background-color:var(--bg-card)}tr:last-child td{border-bottom:none}tr:nth-child(2n) td{background-color:var(--bg-light)}.card-container,.quiz-container{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem;margin:2rem 0}.card,.quiz-card{background-color:var(--bg-card);padding:1.5rem;border-radius:var(--border-radius);text-align:center;box-shadow:var(--box-shadow);transition:transform .3s ease,box-shadow .3s ease;border:none;height:100%}.card:hover,.quiz-card:hover{transform:translateY(-5px);box-shadow:0 6px 12px #0000001a}.card h4,.quiz-card h3{margin-top:0;color:var(--primary)}.button{display:inline-block;background-color:var(--primary);color:#fff;padding:.75rem 1.5rem;text-decoration:none;border-radius:50px;font-weight:500;border:none;cursor:pointer;transition:background-color .3s ease,transform .2s ease;text-align:center;box-shadow:0 2px 4px #0000001a}.button:hover{background-color:var(--primary-dark);transform:translateY(-2px);box-shadow:0 4px 8px #00000026}.button.secondary{background-color:var(--secondary);color:var(--text-primary)}@media (max-width: 768px){.card-container,.quiz-container{grid-template-columns:1fr}nav{gap:1.5rem}h1{font-size:2rem}h2{font-size:1.75rem}main{padding:1.5rem 1rem}.irregular-grid{grid-template-columns:1fr!important}}@media (max-width: 480px){nav{flex-direction:column;gap:.75rem}h1{font-size:1.75rem}}.flashcard{perspective:1000px;height:220px;position:relative;cursor:pointer;margin-bottom:2rem}.flashcard-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .8s cubic-bezier(.175,.885,.32,1.275);transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;-webkit-backface-visibility:hidden;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius);box-shadow:var(--box-shadow);padding:1.5rem;font-size:1.5rem}.flashcard-front{background-color:var(--primary);color:#fff;font-weight:600}.flashcard-back{background-color:var(--secondary);color:var(--text-primary);transform:rotateY(180deg);font-weight:500}.flashcard-controls{display:flex;justify-content:center;gap:1rem;margin-top:1.5rem}.flashcard-controls button{background-color:var(--bg-light);color:var(--text-primary);border:none;padding:.75rem 1.5rem;border-radius:50px;cursor:pointer;font-weight:500;transition:all .2s ease;box-shadow:0 2px 4px #0000000d}.flashcard-controls button:hover{background-color:var(--primary);color:#fff;transform:translateY(-2px);box-shadow:0 4px 8px #0000001a}#flip-card{background-color:var(--primary);color:#fff}#flip-card:hover{background-color:var(--primary-dark)}.quiz-form{display:flex;flex-direction:column;gap:1.25rem;max-width:400px;margin:1.5rem auto}.quiz-form input{padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:8px;font-size:1rem;transition:border-color .3s ease,box-shadow .3s ease}.quiz-form input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4361ee26}.quiz-form button{background-color:var(--primary);color:#fff;border:none;padding:.75rem 1rem;border-radius:8px;cursor:pointer;font-weight:600;transition:background-color .3s ease,transform .2s ease}.quiz-form button:hover{background-color:var(--primary-dark);transform:translateY(-2px)}.feedback{margin:1rem 0;padding:.75rem 1rem;border-radius:8px;text-align:center;font-weight:500;opacity:0;transform:translateY(10px);transition:opacity .3s ease,transform .3s ease}.feedback:not(:empty){opacity:1;transform:translateY(0)}.feedback.correct{background-color:#06d6a01a;color:var(--success);border:1px solid rgba(6,214,160,.3)}.feedback.incorrect{background-color:#ef476f1a;color:var(--error);border:1px solid rgba(239,71,111,.3)}.quiz-score{margin-top:1.5rem;text-align:center;font-weight:600;color:var(--text-primary)}.next-button{background-color:var(--bg-light)!important;color:var(--text-primary)!important;padding:.75rem 1.5rem!important;border-radius:8px!important;font-weight:500!important;margin-top:1.5rem!important;transition:background-color .3s ease,transform .2s ease!important}.next-button:hover{background-color:var(--secondary)!important;transform:translateY(-2px)!important}#quiz-question{background-color:var(--bg-light)!important;border-radius:8px!important;border-left:4px solid var(--primary)!important}a,button,.button,.card,.category-card,.flashcard-controls button,.quiz-form button,.irregular-card{transition:all .3s cubic-bezier(.25,1,.5,1)}a:focus,button:focus,input:focus,select:focus,textarea:focus{outline:3px solid rgba(67,97,238,.3);outline-offset:2px}::selection{background-color:var(--primary);color:#fff}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--bg-light);border-radius:4px}::-webkit-scrollbar-thumb{background:var(--primary);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--primary-dark)}footer[data-astro-cid-sckkx6r4]{text-align:center;display:flex;justify-content:center;align-items:center;padding:1rem}header[data-astro-cid-sckkx6r4]{background-color:#fff;padding:1rem 0;box-shadow:0 2px 10px #0000000d;position:relative}.header-container[data-astro-cid-sckkx6r4]{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between}.site-title-container[data-astro-cid-sckkx6r4]{display:flex;align-items:center}.site-title[data-astro-cid-sckkx6r4]{margin:0;font-size:1.5rem;color:var(--primary);font-weight:700}.main-nav[data-astro-cid-sckkx6r4]{display:flex;align-items:center}.mobile-menu-toggle[data-astro-cid-sckkx6r4]{position:relative;z-index:200;display:none}@media (max-width: 900px){.header-container[data-astro-cid-sckkx6r4]{position:relative}.main-nav[data-astro-cid-sckkx6r4]{position:static}.mobile-menu-toggle[data-astro-cid-sckkx6r4]{display:flex;align-items:center;justify-content:center;background:none;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer;width:40px;height:40px;border-radius:8px;margin-left:auto}.nav-list[data-astro-cid-sckkx6r4]{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background-color:#fff;box-shadow:0 4px 8px #0000001a;border-radius:0 0 12px 12px;padding:1.5rem;z-index:100;width:100%;box-sizing:border-box}.nav-list[data-astro-cid-sckkx6r4].active{display:flex!important}.nav-item[data-astro-cid-sckkx6r4]{width:100%;margin-bottom:.75rem;border-bottom:1px solid #eee}.nav-item[data-astro-cid-sckkx6r4]:last-child{border-bottom:none;margin-bottom:0}.nav-link[data-astro-cid-sckkx6r4]{padding:1rem;width:100%;display:flex;justify-content:flex-start;align-items:center;border-radius:8px}.nav-link[data-astro-cid-sckkx6r4]:hover{background-color:var(--bg-accent)}}