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var(--tw-backdrop-sepia)}.transition{transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,-webkit-backdrop-filter,backdrop-filter;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.transition-all{transition-property:all;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.transition-colors{transition-property:color,background-color,border-color,text-decoration-color,fill,stroke;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.transition-opacity{transition-property:opacity;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.transition-shadow{transition-property:box-shadow;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.transition-transform{transition-property:transform;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.duration-150{transition-duration:.15s}.duration-200{transition-duration:.2s}.duration-300{transition-duration:.3s}.duration-500{transition-duration:.5s}.ease-out{transition-timing-function:cubic-bezier(0,0,.2,1)}.\[mask-image\:radial-gradient\(ellipse_at_center\,black_30\%\,transparent_75\%\)\]{-webkit-mask-image:radial-gradient(#000 30%,#0000 75%);mask-image:radial-gradient(#000 30%,#0000 75%)}.\[mask-image\:radial-gradient\(ellipse_at_center\,black_40\%\,transparent_80\%\)\]{-webkit-mask-image:radial-gradient(#000 40%,#0000 80%);mask-image:radial-gradient(#000 40%,#0000 80%)}:root{--primary:#ff6b00;--primary-hover:#e55c00;--primary-light:#fff7ed;--primary-dark:#c2410c;--primary-glow:#ff6b0026;--navy:#0b0f1e;--peach:#ffedd9;--console-bg:#0b0f1e;--bg-main:#0b0f1e;--bg-card:#141c2e;--bg-elevated:#1e293b;--bg-surface:#1e293b;--bg-muted:#0b0f1e;--text-main:#f8fafc;--text-sub:#cbd5e1;--text-muted:#a1a1aa;--text-faint:#71717a;--border:#ffffff14;--border-strong:#ffffff26;--accent:#10b981;--accent-light:#d1fae5;--accent-bg:#f0fdf4;--accent-border:#86efac;--warning:#f59e0b;--warning-light:#fffbeb;--danger:#ef4444;--danger-light:#fef2f2;--purple:#8b5cf6;--success:#10b981;--error:#ef4444;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-2xl:24px;--radius-3xl:32px;--shadow-sm:0 1px 3px 0 #00000014, 0 1px 2px -1px #0000000f;--shadow-md:0 4px 12px -2px #0000001a, 0 2px 6px -2px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--shadow-primary:0 10px 15px -3px #ff6b0033;--shadow-orange-glow:0 20px 50px -20px #ff6b0040}.auth-container{background:radial-gradient(circle at top left, var(--primary-light), transparent), radial-gradient(circle at bottom right, var(--accent-light), transparent);justify-content:center;align-items:center;min-height:100vh;padding:2rem;display:flex}.auth-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:420px;box-shadow:var(--shadow-lg);padding:2.5rem}.auth-header{text-align:center;margin-bottom:2rem}.auth-icon{background:var(--primary-light);width:48px;height:48px;color:var(--primary);border-radius:var(--radius-md);justify-content:center;align-items:center;margin:0 auto 1rem;display:flex}.auth-header h1{color:var(--text-main);margin-bottom:.5rem;font-size:24px;font-weight:800}.auth-header p{color:var(--text-muted);font-size:14px}.auth-form{flex-direction:column;gap:1.25rem;display:flex}.form-group{flex-direction:column;gap:.5rem;display:flex}.form-group label{color:var(--text-sub);font-size:13px;font-weight:600}.input-wrapper{align-items:center;display:flex;position:relative}.input-icon{color:var(--text-muted);position:absolute;left:12px}.input-wrapper input{background:var(--bg-main);border:1px solid var(--border);border-radius:var(--radius-md);width:100%;padding:.75rem 1rem .75rem 2.5rem;font-family:inherit;font-size:14px;transition:all .2s}.input-wrapper input:focus{border-color:var(--primary);background:var(--bg-card);box-shadow:0 0 0 4px var(--primary-glow);outline:none}.auth-btn{background:var(--primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;gap:.5rem;margin-top:.5rem;padding:.75rem;font-size:14px;font-weight:600;transition:all .2s;display:flex}.auth-btn:hover:not(:disabled){background:var(--primary-hover);box-shadow:var(--shadow-primary);transform:translateY(-1px)}.auth-btn:disabled{opacity:.7;cursor:not-allowed}.sidebar-auth-prompt{background:var(--bg-main);border-radius:var(--radius-lg);border:1px dashed var(--border-strong);text-align:center;margin:1rem;padding:1.5rem}.auth-footer{text-align:center;color:var(--text-muted);margin-top:2rem;font-size:14px}.auth-footer a{color:var(--primary);font-weight:600}.auth-footer a:hover{text-decoration:underline}.pr-problem-link{color:var(--text-main);align-items:center;gap:8px;font-weight:500;text-decoration:none;display:flex}.pr-problem-name{color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;font-weight:600;overflow:hidden}.topic-pill{background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-sub);border-radius:99px;padding:2px 8px;font-size:11px}.tag-more{color:var(--text-muted);margin-left:4px;font-size:11px}@keyframes lp-marquee{0%{transform:translate(0)}to{transform:translate(-50%)}}@keyframes lp-glow-pulse{0%,to{opacity:.6}50%{opacity:1}}@keyframes lp-cursor-blink{0%,to{opacity:1}50%{opacity:0}}@keyframes livePulse{0%{box-shadow:0 0 #10b98166}70%{box-shadow:0 0 0 8px #10b98100}to{box-shadow:0 0 #10b98100}}.lp-marquee{animation:32s linear infinite lp-marquee}.lp-glow-pulse{animation:4s ease-in-out infinite lp-glow-pulse}.lp-cursor-blink{animation:1s step-end infinite lp-cursor-blink}.glow-pulse{animation:4s ease-in-out infinite lp-glow-pulse}.cursor-blink{animation:1s step-end infinite lp-cursor-blink}.scrollbar-hide{scrollbar-width:none}.scrollbar-hide::-webkit-scrollbar{display:none}.landing-page{background:#fff;min-height:100vh;font-family:Inter,Plus Jakarta Sans,system-ui,sans-serif}.landing-nav{z-index:50;position:fixed;top:0;left:0;right:0}.landing-nav-container{justify-content:space-between;align-items:center;max-width:80rem;margin-left:auto;margin-right:auto;padding-left:1.5rem;padding-right:1.5rem;display:flex}.landing-nav-links{align-items:center;gap:2rem;display:flex}.hero-section{background:#fff;position:relative;overflow:hidden}.hero-section:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(80% 60% at 50% 30%,#ff6b001a,#0000 70%);position:absolute;inset:0}.hero-section:after{content:"";pointer-events:none;z-index:0;background-image:linear-gradient(#0000000a 1px,#0000 1px),linear-gradient(90deg,#0000000a 1px,#0000 1px);background-size:36px 36px;position:absolute;inset:0;-webkit-mask-image:radial-gradient(80% 70% at 50% 30%,#000 40%,#0000 100%);mask-image:radial-gradient(80% 70% at 50% 30%,#000 40%,#0000 100%)}.hero-title{letter-spacing:-.03em;color:var(--navy);font-size:clamp(2.4rem,5vw,4.2rem);font-weight:900;line-height:.97}.text-gradient{color:#0000;-webkit-background-clip:text;background-clip:text;background-image:linear-gradient(135deg, var(--primary), #f59e0b);-webkit-background-clip:text}.hero-subtitle{color:#475569;max-width:560px;font-size:1.125rem;line-height:1.7}.hero-actions{align-items:center;gap:.75rem;display:flex}.btn-lg{padding:.875rem 2rem;font-size:1rem;line-height:1.5rem}.btn-outline{--tw-border-opacity:1;border-width:1px;border-color:rgb(203 213 225/var(--tw-border-opacity,1));--tw-bg-opacity:1;background-color:rgb(255 255 255/var(--tw-bg-opacity,1));--tw-text-opacity:1;color:rgb(15 23 42/var(--tw-text-opacity,1));border-radius:9999px;transition:border-color .2s,box-shadow .2s}.btn-outline:hover{border-color:#64748b}.features-section{--tw-bg-opacity:1;background-color:rgb(255 255 255/var(--tw-bg-opacity,1));padding:6rem 1.5rem}.section-header{text-align:center;margin-bottom:3.5rem}.section-h2{letter-spacing:-.03em;color:var(--navy);margin-bottom:1rem;font-size:clamp(1.75rem,3.5vw,2.75rem);font-weight:900;line-height:1.05}.section-p{--tw-text-opacity:1;max-width:36rem;color:rgb(71 85 105/var(--tw-text-opacity,1));margin-left:auto;margin-right:auto;font-size:1rem;line-height:1.7}.features-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.25rem;max-width:80rem;margin-left:auto;margin-right:auto;display:grid}.feature-card{--tw-bg-opacity:1;background-color:rgb(255 255 255/var(--tw-bg-opacity,1));border-width:1px;border-color:#0000000f;border-radius:32px;padding:2rem;transition-property:all;transition-duration:.15s;transition-timing-function:cubic-bezier(.4,0,.2,1)}.feature-card:hover{--tw-translate-y:-.25rem;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y));box-shadow:var(--shadow-orange-glow);border-color:#ff6b0040}.feature-icon{background:var(--peach);width:48px;height:48px;color:var(--primary);border-radius:20px;justify-content:center;align-items:center;margin-bottom:1.5rem;display:flex}.feature-card h3{color:var(--navy);margin-bottom:.75rem;font-size:1.125rem;font-weight:700;line-height:1.75rem}.feature-card p{color:#475569;font-size:.9375rem;line-height:1.625}.lp-dark-section{background:var(--navy);position:relative;overflow:hidden}.lp-dark-section:before{content:"";pointer-events:none;background-image:linear-gradient(#ffffff06 1px,#0000 1px),linear-gradient(90deg,#ffffff06 1px,#0000 1px);background-size:48px 48px;position:absolute;inset:0;-webkit-mask-image:radial-gradient(80% 80%,#000 30%,#0000 100%);mask-image:radial-gradient(80% 80%,#000 30%,#0000 100%)}.landing-footer{--tw-bg-opacity:1;background-color:rgb(255 255 255/var(--tw-bg-opacity,1));border-top-width:1px;border-color:var(--border);padding:4rem 1.5rem}.footer-content{text-align:center;max-width:1200px;margin:0 auto}.container{max-width:1200px;margin:0 auto}.brand{color:var(--text-main);align-items:center;gap:.75rem;font-size:18px;font-weight:700;display:flex}.brand-mark{background:var(--primary);color:#fff;border-radius:8px;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:999px;align-items:center;gap:.5rem;padding:.5rem 1.5rem;font-weight:600;transition:all .2s;display:flex}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px)}.btn-accent{color:#fff;background:#10b981}.btn-accent:hover{background:#059669}.card-flat:hover{box-shadow:var(--shadow-sm);border-color:var(--border)}.pill{border:1px solid var(--border);background:var(--bg-elevated);height:24px;color:var(--text-sub);white-space:nowrap;border-radius:999px;align-items:center;padding:0 10px;font-size:11px;font-weight:600;display:inline-flex}.pill-live{color:#065f46;background:#d1fae5;border-color:#a7f3d0}.pill-up{background:var(--primary-light);color:#3730a3;border-color:#c7d2fe}.pill-ended{border-color:var(--border);background:var(--bg-elevated);color:var(--text-muted)}.pill-tag{color:#5b21b6;background:#ede9fe;border-color:#ddd6fe}.difficulty-pill{letter-spacing:.02em;text-transform:uppercase;border:1px solid #0000;border-radius:6px;align-items:center;height:22px;padding:0 8px;font-size:10px;font-weight:800;display:inline-flex}.diff-easy{color:#10b981;background:#10b9811a;border-color:#10b98133}.diff-medium{color:#f59e0b;background:#f59e0b1a;border-color:#f59e0b33}.diff-hard{color:#ef4444;background:#ef44441a;border-color:#ef444433}.badge{border-radius:999px;padding:3px 8px;font-size:11px;font-weight:600}.badge-easy{color:#10b981;background:#10b9811a}.badge-medium{color:#f59e0b;background:#f59e0b1a}.badge-hard{color:#ef4444;background:#ef44441a}.tag-pill{border:1px solid var(--border);background:var(--bg-elevated);height:24px;color:var(--text-muted);border-radius:999px;padding:0 10px;font-size:11px;font-weight:600}.result-pill{border:1px solid var(--border);background:var(--bg-elevated);height:28px;color:var(--text-sub);letter-spacing:.04em;text-transform:uppercase;border-radius:999px;align-items:center;gap:6px;padding:0 12px;font-size:11px;font-weight:700;display:inline-flex}.result-ok{color:#065f46;background:#d1fae5;border-color:#a7f3d0}.result-bad{color:#991b1b;background:#fee2e2;border-color:#fecaca}.result-neutral{background:var(--primary-light);color:#3730a3;border-color:#c7d2fe}.progress{background:var(--bg-elevated);border:1px solid var(--border);border-radius:999px;width:100%;height:8px;overflow:hidden}.progress-fill{border-radius:999px;height:100%;transition:width .8s}.solver-top{justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.solver-top-left{align-items:center;gap:10px;display:flex}.solver-top-right{align-items:center;gap:8px;display:flex}.dot{color:var(--text-faint)}.contest-question-select{border:1px solid var(--border);background:var(--bg-elevated);min-width:240px;max-width:340px;height:34px;color:var(--text-main);border-radius:10px;padding:0 10px;font-size:12px;font-weight:600}.contest-watermark{pointer-events:none;z-index:0;letter-spacing:.06em;color:#64748b1c;-webkit-user-select:none;user-select:none;text-transform:uppercase;white-space:nowrap;justify-content:center;align-items:center;font-size:clamp(28px,5vw,64px);font-weight:800;display:flex;position:fixed;inset:0;transform:rotate(-28deg)}.solver-layout{grid-template-columns:1fr 1fr;align-items:start;gap:16px;height:calc(100vh - 85px);display:grid}.solver-left,.solver-right{flex-direction:column;gap:14px;height:100%;display:flex;overflow:hidden}.tabs-header{border-bottom:1px solid var(--border);background:var(--bg-elevated);border-radius:var(--radius-xl) var(--radius-xl) 0 0;flex-shrink:0;gap:2px;padding:0 4px;display:flex}.tab-btn-v2{color:var(--text-sub);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;align-items:center;gap:6px;margin-bottom:-1px;padding:12px 14px;font-size:13px;font-weight:600;transition:all .18s;display:flex}.tab-btn-v2:hover{color:var(--text-sub)}.tab-btn-v2.active{color:var(--primary);border-bottom-color:var(--primary)}.tab-content{flex:1;padding:1.5rem;overflow-y:auto}.solver-subtitle{letter-spacing:.12em;text-transform:uppercase;color:var(--primary);opacity:.9;margin-bottom:12px;font-size:11px;font-weight:800}.solver-subsection{margin-top:2rem}.example-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-main);padding:16px;font-family:JetBrains Mono,monospace;font-size:13px;line-height:1.8}.example-label{color:var(--text-sub);text-transform:uppercase;letter-spacing:.05em;font-size:11px;font-weight:700}pre{background:var(--bg-elevated);border-radius:var(--radius-md);border:1px solid var(--border);color:var(--text-main);padding:16px;font-family:JetBrains Mono,monospace;font-size:13px;line-height:1.7;overflow-x:auto}.editor-card{padding:0;overflow:hidden}.editor-toolbar{border-bottom:1px solid var(--border);background:var(--bg-elevated);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding:10px 14px;display:flex}.editor-filename{color:var(--text-muted);align-items:center;gap:6px;font-family:JetBrains Mono,monospace;font-size:12px;font-weight:600;display:flex}.editor-actions{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.editor-wrap{border-bottom:1px solid var(--border)}.output-container{background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border);flex-direction:column;min-height:140px;display:flex;overflow:hidden}.output-header{background:var(--bg-elevated);border-bottom:1px solid var(--border);letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);align-items:center;padding:10px 14px;font-size:11px;font-weight:700;display:flex}.output-body{color:var(--text-main);white-space:pre-wrap;flex:1;padding:14px;font-family:JetBrains Mono,monospace;font-size:12px;line-height:1.7;overflow-y:auto}.timer-pill{background:var(--bg-elevated);border:1px solid var(--border);height:30px;color:var(--text-muted);border-radius:999px;align-items:center;gap:6px;padding:0 12px;font-family:JetBrains Mono,monospace;font-size:12px;font-weight:600;display:inline-flex}.link-muted{color:var(--text-muted);font-size:13px;font-weight:600;transition:color .15s}.link-muted:hover{color:var(--text-main)}.submissions-list{flex-direction:column;gap:8px;display:flex}.sub-row{border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-elevated);align-items:center;gap:12px;padding:12px 14px;display:flex}.sub-status{font-size:12px;font-weight:700}.sub-status.accepted{color:var(--accent)}.sub-meta{color:var(--text-muted);flex:1;gap:12px;font-size:12px;display:flex}.sub-time{color:var(--text-muted);font-size:12px}.analysis-card-modern{background:var(--bg-elevated);border-radius:var(--radius-md);border:1px solid var(--border);flex-direction:column;gap:12px;padding:16px;display:flex}.analysis-item{justify-content:space-between;align-items:center;display:flex}.analysis-label{color:var(--text-muted);font-size:13px;font-weight:500}.analysis-value{color:var(--text-main);font-size:14px;font-weight:700}.analysis-value.highlight{color:var(--primary)}.user-runtime-line{background:var(--primary);z-index:10;width:2px;position:absolute;top:0;box-shadow:0 0 10px #4f46e566}.user-runtime-label{background:var(--primary);color:#fff;white-space:nowrap;border-radius:6px;padding:3px 8px;font-size:10px;font-weight:700;position:absolute;top:-28px;left:50%;transform:translate(-50%)}.modal-overlay{z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0f172a80;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.coupon-modal-overlay{z-index:180;padding:24px}.coupon-modal-panel{background:linear-gradient(#fff 0%,#fafafa 100%);border:1px solid 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var(--border,#e2e8f0);border-radius:var(--radius-lg,16px);background:var(--bg-card,#fff);padding:16px}.exam-tests-title{color:var(--text-sub,#334155);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px;font-size:13px;font-weight:700}.exam-test-item{background:var(--bg-elevated,#f1f5f9);border-radius:var(--radius-md,12px);margin-bottom:8px;padding:12px;font-family:JetBrains Mono,monospace;font-size:13px}.exam-palette-footer{background:var(--bg-card,#fff);border-top:1px solid var(--border,#e2e8f0);justify-content:center;padding:20px;display:flex}.exam-submit{background:var(--primary,#4f46e5);color:#fff;text-transform:uppercase;letter-spacing:.05em;cursor:pointer;border:none;border-radius:6px;width:100%;padding:12px;font-size:15px;font-weight:700;transition:all .2s;box-shadow:0 4px 14px #4f46e540}.exam-submit:hover:not(:disabled){background:var(--primary-hover,#4338ca);transform:translateY(-1px);box-shadow:0 6px 20px #4f46e559}.exam-submit:disabled{opacity:.5;cursor:not-allowed;box-shadow:none}@media (width<=1024px){.exam-main{flex-direction:column;overflow:auto}.exam-palette{border-left:none;border-top:1px solid var(--border,#e2e8f0);width:100%}}.contest-root{box-sizing:border-box;gap:20px;padding:20px;display:flex}.contest-left{background:#f8fafc;border-radius:8px;width:45%;height:calc(100vh - 60px);padding:18px;overflow:auto;box-shadow:0 1px 3px #0000000a}.problem-header{margin-bottom:6px;font-size:20px;font-weight:600}.problem-meta{color:#374151;margin-bottom:12px}.problem-body h4{margin:12px 0 6px}.example{background:#fff;border:1px solid #e6eef5;border-radius:6px;padding:12px}.contest-right{flex-direction:column;gap:12px;width:55%;display:flex}.editor-toolbar{justify-content:space-between;align-items:center;display:flex}.toolbar-actions{gap:8px;display:flex}.btn{cursor:pointer;border:none;border-radius:6px;padding:8px 12px}.btn.run{color:#fff;background:#10b981}.btn.submit{color:#fff;background:#6b46c1}.code-editor{resize:vertical;background:#fff;border:1px solid #e5e7eb;border-radius:6px;width:100%;height:55vh;min-height:320px;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Roboto Mono,Courier New,monospace;font-size:13px}.test-results{background:#f3f4f6;border-radius:6px;height:25vh;padding:12px;overflow:auto}.test-header{margin-bottom:8px;font-weight:600}.test-output{white-space:pre-wrap}