:root{--bg-color: #0f111a;--text-primary: #ffffff;--text-secondary: #9da3ad;--accent-color: #6366f1;--accent-hover: #4f46e5;--card-bg: rgba(255, 255, 255, .05);--card-border: rgba(255, 255, 255, .1);--gradient-1: linear-gradient(135deg, #6366f1, #a855f7, #ec4899);--font-main: "Outfit", sans-serif}*{margin:0;padding:0;box-sizing:border-box}img,picture,video,canvas,svg{display:block;max-width:100%;height:auto}body{font-family:var(--font-main);background-color:var(--bg-color);color:var(--text-primary);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden;position:relative}body:before,body:after{content:"";position:absolute;width:50vw;height:50vw;border-radius:50%;filter:blur(150px);z-index:-1;opacity:.15}body:before{top:-20%;left:-10%;background:var(--accent-color)}body:after{bottom:-20%;right:-10%;background:#ec4899}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 5%;background:#0f111acc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--card-border)}.logo{font-size:1.8rem;font-weight:700;letter-spacing:-.5px;display:flex;align-items:center;gap:.75rem}.nav-logo{width:32px;height:32px;object-fit:contain}.logo .dot{color:#ec4899}.nav-links{display:flex;list-style:none;gap:2rem;position:absolute;left:50%;transform:translate(-50%)}.nav-links a{text-decoration:none;color:var(--text-secondary);font-weight:600;transition:color .3s ease}.nav-links a:hover,.nav-links a.active{color:var(--text-primary)}.btn{font-family:var(--font-main);padding:.75rem 1.5rem;border-radius:8px;font-weight:600;cursor:pointer;transition:all .3s ease;font-size:1rem}.btn-outline{background:transparent;color:var(--text-primary);border:1px solid var(--card-border)}.btn-outline:hover{background:#ffffff1a}.btn-primary{background:var(--gradient-1);color:#fff;border:none;box-shadow:0 4px 15px #6366f14d}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #6366f180}.hero{padding:8rem 5% 6rem;text-align:center;display:flex;justify-content:center;flex:1}.hero-content{max-width:800px;animation:fadeIn 1s ease-out forwards}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.hero-title{font-size:4rem;font-weight:700;line-height:1.1;margin-bottom:1.5rem;letter-spacing:-1px}.gradient-text{background:var(--gradient-1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.25rem;color:var(--text-secondary);margin-bottom:2.5rem;max-width:600px;margin-inline:auto}.cta{padding:1rem 2.5rem;font-size:1.1rem;border-radius:50px}.categories{padding:5rem 5%;background:#0003}.section-title{text-align:center;font-size:2.5rem;margin-bottom:3rem;font-weight:600}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;max-width:1200px;width:100%;box-sizing:border-box;margin:0 auto}.card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:2rem;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all .4s cubic-bezier(.175,.885,.32,1.275);display:flex;flex-direction:column;position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:var(--accent-color);transform:scaleX(0);transform-origin:left;transition:transform .4s ease}.card:hover:before{transform:scaleX(1)}.card-c:before{background:#555659}.card-cpp:before{background:#00599c}.card-java:before{background:#db380e}.card-kotlin:before{background:#7f52ff}.card-python:before{background:#ffd43b}.card-javascript:before{background:#f7df1e}.card-csharp:before{background:#239120}.card-go:before{background:#00add8}.card:hover{transform:translateY(-10px);box-shadow:0 20px 40px #0006;border-color:#fff3}.card-icon{width:50px;height:50px;border-radius:12px;background:#ffffff1a;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.2rem;color:#fff}.card-c .card-icon{background:#55565933;color:#a8b9cc}.card-cpp .card-icon{background:#00599c33;color:#00599c}.card-java .card-icon{background:#db380e33;color:#db380e}.card-kotlin .card-icon{background:#7f52ff33;color:#7f52ff}.card-python .card-icon{background:#ffd43b33;color:#ffd43b}.card-javascript .card-icon{background:#f7df1e33;color:#f7df1e}.card-csharp .card-icon{background:#23912033;color:#239120}.card-go .card-icon{background:#00add833;color:#00add8}.card h3{font-size:1.5rem}.card p{color:var(--text-secondary);font-size:.95rem;margin-bottom:1.5rem}.card-actions{display:flex;flex-direction:column;gap:1rem}.card-row-1{display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem}.card-row-2{flex:1}.card-row-3{margin-top:auto}.card-link{color:var(--accent-color);text-decoration:none;font-weight:600;font-size:.95rem;display:inline-flex;align-items:center;transition:all .3s ease}.card:hover .card-link{color:#fff;gap:5px}.diff-options{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}.diff-btn{background:#ffffff0d;border:1px solid var(--card-border);padding:.5rem;border-radius:6px;color:var(--text-secondary);font-size:.85rem;text-align:center;text-decoration:none;transition:all .2s ease}.diff-btn:hover{background:#ffffff1a;color:var(--text-primary);border-color:var(--accent-color)}.diff-easy:hover{border-color:#10b981}.diff-moderate:hover{border-color:#f59e0b}.diff-hard:hover{border-color:#ef4444}.diff-mixed:hover,.diff-interview:hover{border-color:#8b5cf6}.main-layout{display:flex;gap:2rem;margin:0 auto;padding:0 5%;flex:1;max-width:100%;box-sizing:border-box}.content-left{flex:1 1 auto;display:flex;flex-direction:column;min-width:0;overflow-wrap:break-word}.categories{padding:5rem 0}.footer{text-align:center;padding:1.5rem;color:var(--text-secondary);border-top:1px solid var(--card-border);margin-top:auto;font-size:.85rem}.code-question{font-family:Consolas,Monaco,Courier New,monospace;background-color:#0000004d;padding:1.5rem;border-radius:12px;white-space:pre-wrap;text-align:left;line-height:1.5;border:1px solid var(--card-border);margin:1rem 0;font-size:1.1rem;width:100%}.quiz-page-container,.result-page-container{flex:1;display:flex;flex-direction:column;padding-top:2rem}.quiz-container{max-width:1000px;width:100%;margin:2rem 0;padding:2rem;background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 10px 30px #0000004d;display:flex;flex-direction:column;height:600px}.quiz-row-1{flex:0 0 auto;padding-bottom:1rem;display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap;border-bottom:1px solid var(--card-border);font-size:1.2rem;font-weight:600}.quiz-lang{text-transform:uppercase;color:var(--accent-color)}.quiz-timer{color:#ef4444;font-weight:700}.quiz-row-2{flex:1 1 auto;display:flex;align-items:center;justify-content:center;padding:1.5rem 0;overflow-y:auto}.question-text{font-size:1.6rem;text-align:center;width:100%}.quiz-row-3{flex:0 0 auto;display:flex;align-items:center;padding-bottom:1rem}.options-list{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto;gap:1rem;width:100%}.option-btn{background:#ffffff0d;border:1px solid var(--card-border);padding:1rem 1.5rem;border-radius:8px;color:var(--text-primary);font-family:var(--font-main);font-size:1.1rem;text-align:left;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.option-btn:hover{background:#ffffff1a;border-color:var(--accent-color)}.option-btn.selected{background:#6366f133;border-color:var(--accent-color)}.option-btn.correct{background:#10b98133;border-color:#10b981}.option-btn.incorrect{background:#ef444433;border-color:#ef4444}.quiz-row-4{flex:0 0 auto;display:flex;justify-content:flex-end;align-items:center;padding-top:1rem;border-top:1px solid var(--card-border)}.result-container{max-width:800px;margin:2rem auto;padding:3rem 2rem;background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 10px 30px #0000004d;text-align:center}.result-icon{font-size:5rem;margin-bottom:1rem}.result-title{font-size:2.5rem;margin-bottom:1rem}.result-score{font-size:5rem;font-weight:700;color:var(--accent-color);margin-bottom:1rem;line-height:1}.result-percentage{font-size:1.5rem;color:var(--text-secondary);margin-bottom:2rem}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-bottom:3rem}.stat-card{background:#ffffff08;border:1px solid var(--card-border);padding:1.5rem;border-radius:12px}.stat-value{font-size:2rem;font-weight:700;color:var(--text-primary)}.stat-label{font-size:.9rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px}.stat-correct{color:#10b981}.stat-incorrect{color:#ef4444}.stat-missed{color:#f59e0b}.action-buttons{display:flex;justify-content:center;gap:1rem}@media(max-width:1024px){.main-layout{flex-direction:column}.hero{padding:6rem 0 4rem}.hero-title{font-size:3.2rem}.nav-links{gap:1.5rem}.categories{padding:4rem 0}.grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:768px){.navbar{padding:1rem 5%}.hero{padding:4rem 0}.hero-title{font-size:2.5rem;line-height:1.2}.hero-subtitle{font-size:1rem;padding:0 1rem}.section-title{font-size:2rem}.nav-links{display:flex}.grid{grid-template-columns:1fr}.hero{padding-top:5rem}.quiz-container{margin:1rem;padding:1.5rem;height:auto;min-height:60vh}.quiz-row-1{flex-direction:column;align-items:flex-start;gap:.5rem;height:auto;padding-bottom:1rem}.quiz-row-2{height:auto;padding:2rem 0}.question-text{font-size:1.25rem}.quiz-row-3{height:auto;padding-bottom:1rem}.options-list{grid-template-columns:1fr;grid-template-rows:auto}.option-btn{padding:.8rem 1.2rem;font-size:1rem;word-wrap:break-word}.quiz-row-4{height:auto;justify-content:center}.quiz-row-4 .btn{width:100%}.quiz-page-container{padding-top:1rem}.result-container{margin:1rem;padding:2rem 1rem}.result-icon{font-size:4rem}.result-title{font-size:2rem}.result-score{font-size:4rem}.action-buttons{flex-direction:column}.action-buttons .btn{width:100%}}@media(max-width:480px){.hero-title{font-size:2rem}.section-title{font-size:1.5rem}.card{padding:1.5rem}.categories{padding:3rem 0}.quiz-container{margin:.5rem;padding:1rem;border-radius:12px}.quiz-title{font-size:1.2rem}.question-text{font-size:1.1rem}.result-container{margin:.5rem;padding:1.5rem 1rem;border-radius:12px}.result-icon{font-size:3rem}.result-title{font-size:1.5rem}.result-score{font-size:3rem}.result-percentage{font-size:1.25rem}.stats-grid{grid-template-columns:1fr}.stat-value{font-size:1.5rem}}