@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap";
:root{--cm-red:#ff2d55;--cm-red-glow:#ff2d5566;--cm-cyan:#00f0ff;--cm-cyan-glow:#00f0ff4d;--cm-green:#0f8;--cm-green-glow:#00ff884d;--cm-purple:#a855f7;--cm-purple-glow:#a855f74d;--cm-orange:#ff8c00;--cm-yellow:gold;--bg-primary:#0a0a0f;--bg-secondary:#111118;--bg-tertiary:#1a1a24;--bg-elevated:#1e1e2e;--bg-card:#161623cc;--bg-glass:#ffffff08;--bg-glass-hover:#ffffff0f;--text-primary:#f0f0f5;--text-secondary:#8888a0;--text-muted:#555568;--text-accent:var(--cm-cyan);--border-primary:#ffffff14;--border-hover:#ffffff26;--border-accent:#00f0ff4d;--shadow-sm:0 1px 3px #00000080;--shadow-md:0 4px 12px #0009;--shadow-lg:0 8px 32px #000000b3;--shadow-glow-red:0 0 30px var(--cm-red-glow);--shadow-glow-cyan:0 0 30px var(--cm-cyan-glow);--shadow-glow-green:0 0 20px var(--cm-green-glow);--space-xs:.25rem;--space-sm:.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--space-3xl:4rem;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--font-size-xs:.75rem;--font-size-sm:.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:2rem;--font-size-4xl:2.5rem;--font-size-5xl:3.5rem;--font-size-6xl:4.5rem;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-base:.25s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 1);--rating-newbie:gray;--rating-pupil:#00c853;--rating-specialist:#03a89e;--rating-expert:#2979ff;--rating-cm:#aa00e6;--rating-master:#ff8c00;--rating-im:#ff8c00;--rating-gm:#ff1744;--rating-igm:#ff1744;--rating-lgm:#a00}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;overflow-x:hidden}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{border-radius:var(--radius-full);background:#ffffff1f}::-webkit-scrollbar-thumb:hover{background:#fff3}::selection{color:var(--cm-cyan);background:#00f0ff33}a{color:var(--cm-cyan);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--text-primary)}.navbar{-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border-primary);height:64px;padding:0 var(--space-xl);z-index:1000;background:#0a0a0fd9;justify-content:space-between;align-items:center;display:flex;position:fixed;top:0;left:0;right:0}.navbar-brand{align-items:center;gap:var(--space-sm);font-weight:800;font-size:var(--font-size-xl);color:var(--text-primary);letter-spacing:-.5px;display:flex}.navbar-brand .logo-icon{color:var(--cm-red);font-size:var(--font-size-2xl)}.navbar-brand span.brand-accent{color:var(--cm-red)}.navbar-nav{align-items:center;gap:var(--space-lg);list-style:none;display:flex}.navbar-nav a{color:var(--text-secondary);font-weight:500;font-size:var(--font-size-sm);transition:color var(--transition-fast);position:relative}.navbar-nav a:hover,.navbar-nav a.active{color:var(--text-primary)}.navbar-nav a.active:after{content:"";background:var(--cm-cyan);border-radius:var(--radius-full);height:2px;position:absolute;bottom:-4px;left:0;right:0}.navbar-actions{align-items:center;gap:var(--space-md);display:flex}.btn{justify-content:center;align-items:center;gap:var(--space-sm);border-radius:var(--radius-md);font-family:var(--font-sans);font-weight:600;font-size:var(--font-size-sm);cursor:pointer;transition:all var(--transition-base);white-space:nowrap;border:none;padding:10px 20px;display:inline-flex;position:relative;overflow:hidden}.btn-primary{background:linear-gradient(135deg, var(--cm-red), #d91a40);color:#fff;box-shadow:0 4px 15px var(--cm-red-glow)}.btn-primary:hover{box-shadow:0 6px 25px var(--cm-red-glow);transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-glass);color:var(--text-primary);border:1px solid var(--border-primary);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.btn-secondary:hover{background:var(--bg-glass-hover);border-color:var(--border-hover)}.btn-accent{background:linear-gradient(135deg, var(--cm-cyan), #00b8d4);color:var(--bg-primary);box-shadow:0 4px 15px var(--cm-cyan-glow);font-weight:700}.btn-accent:hover{box-shadow:0 6px 25px var(--cm-cyan-glow);transform:translateY(-2px)}.btn-lg{font-size:var(--font-size-base);border-radius:var(--radius-lg);padding:14px 32px}.btn-sm{font-size:var(--font-size-xs);padding:6px 14px}.btn-icon{width:36px;height:36px;padding:8px}.btn-pulse{animation:2s ease-in-out infinite pulse-glow}@keyframes pulse-glow{0%,to{box-shadow:0 4px 15px var(--cm-red-glow)}50%{box-shadow:0 4px 30px var(--cm-red-glow), 0 0 60px #ff2d5526}}.card{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--space-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all var(--transition-base)}.card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-lg);transform:translateY(-2px)}.card-glass{background:var(--bg-glass);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--space-lg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.stat-card{text-align:center;padding:var(--space-xl)}.stat-value{font-size:var(--font-size-4xl);margin-bottom:var(--space-xs);background:linear-gradient(135deg, var(--cm-cyan), var(--cm-purple));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-weight:800;line-height:1}.stat-label{font-size:var(--font-size-sm);color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px;font-weight:500}.badge{border-radius:var(--radius-full);font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:.5px;align-items:center;gap:4px;padding:3px 10px;font-weight:600;display:inline-flex}.badge-live{color:var(--cm-red);background:#ff2d5526;border:1px solid #ff2d554d}.badge-live:before{content:"";background:var(--cm-red);border-radius:50%;width:6px;height:6px;animation:1s ease-in-out infinite blink}@keyframes blink{0%,to{opacity:1}50%{opacity:.3}}@keyframes pulse-line{0%,to{box-shadow:0 0 8px #ff2d5599,0 0 20px #ff2d554d}50%{box-shadow:0 0 16px #ff2d55e6,0 0 40px #ff2d5580}}.badge-rating{font-family:var(--font-mono);font-weight:700}.hero{text-align:center;min-height:100vh;padding:var(--space-3xl) var(--space-xl);flex-direction:column;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.hero:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(#ff2d5514 0%,#0000 70%);width:800px;height:800px;position:absolute;top:0;left:50%;transform:translate(-50%)}.hero:after{content:"";background:linear-gradient(transparent, var(--bg-primary));pointer-events:none;z-index:1;height:200px;position:absolute;bottom:0;left:0;right:0}.hero-content{z-index:2;max-width:800px;position:relative}.hero-subtitle{font-size:var(--font-size-lg);color:var(--cm-cyan);text-transform:uppercase;letter-spacing:3px;margin-bottom:var(--space-lg);font-weight:600}.hero-title{font-size:var(--font-size-6xl);margin-bottom:var(--space-lg);letter-spacing:-2px;font-weight:900;line-height:1.05}.hero-title .highlight{background:linear-gradient(135deg, var(--cm-red), var(--cm-orange));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.hero-description{font-size:var(--font-size-lg);color:var(--text-secondary);max-width:600px;margin:0 auto var(--space-2xl);line-height:1.7}.hero-actions{justify-content:center;align-items:center;gap:var(--space-md);margin-bottom:var(--space-3xl);display:flex}.hero-stats{gap:var(--space-2xl);z-index:2;justify-content:center;display:flex;position:relative}.grid-bg{pointer-events:none;z-index:0;background-image:linear-gradient(#ffffff05 1px,#0000 1px),linear-gradient(90deg,#ffffff05 1px,#0000 1px);background-size:60px 60px;position:fixed;inset:0}.section{padding:var(--space-3xl) var(--space-xl);max-width:1200px;margin:0 auto;position:relative}.section-title{font-size:var(--font-size-3xl);text-align:center;margin-bottom:var(--space-sm);letter-spacing:-1px;font-weight:800}.section-subtitle{font-size:var(--font-size-base);color:var(--text-secondary);text-align:center;margin-bottom:var(--space-3xl)}.features-grid{gap:var(--space-lg);grid-template-columns:repeat(auto-fit,minmax(320px,1fr));display:grid}.feature-card{padding:var(--space-xl);position:relative}.feature-icon{border-radius:var(--radius-md);width:48px;height:48px;font-size:var(--font-size-2xl);margin-bottom:var(--space-md);background:var(--bg-glass);border:1px solid var(--border-primary);justify-content:center;align-items:center;display:flex}.feature-card h3{font-size:var(--font-size-lg);margin-bottom:var(--space-sm);font-weight:700}.feature-card p{color:var(--text-secondary);font-size:var(--font-size-sm);line-height:1.7}.steps{gap:var(--space-xl);flex-direction:column;max-width:700px;margin:0 auto;display:flex}.step{gap:var(--space-lg);align-items:flex-start;display:flex}.step-number{border-radius:var(--radius-full);background:linear-gradient(135deg, var(--cm-red), var(--cm-orange));width:44px;min-width:44px;height:44px;font-weight:800;font-size:var(--font-size-lg);color:#fff;justify-content:center;align-items:center;display:flex}.step-content h3{margin-bottom:var(--space-xs);font-weight:700}.step-content p{color:var(--text-secondary);font-size:var(--font-size-sm);line-height:1.6}.footer{border-top:1px solid var(--border-primary);padding:var(--space-2xl) var(--space-xl);text-align:center;color:var(--text-muted);font-size:var(--font-size-sm)}.typewriter{font-family:var(--font-mono);color:var(--cm-green);border-right:2px solid var(--cm-green);white-space:nowrap;animation:3s steps(20,end) typing,.75s step-end infinite cursor-blink;display:inline-block;overflow:hidden}@keyframes typing{0%{width:0}to{width:100%}}@keyframes cursor-blink{0%,to{border-color:#0000}50%{border-color:var(--cm-green)}}.skeleton{background:linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-elevated) 50%, var(--bg-tertiary) 75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s infinite shimmer}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.input{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-family:var(--font-sans);font-size:var(--font-size-sm);transition:all var(--transition-fast);outline:none;padding:10px 14px}.input:focus{border-color:var(--cm-cyan);box-shadow:0 0 0 3px #00f0ff1a}.input::placeholder{color:var(--text-muted)}.input-group{gap:var(--space-xs);flex-direction:column;display:flex}.input-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:600}.arena{grid-template-rows:56px 1fr;grid-template-columns:200px 1fr;height:calc(100vh - 64px);margin-top:64px;display:grid}.arena-header{padding:0 var(--space-lg);background:var(--bg-secondary);border-bottom:1px solid var(--border-primary);grid-column:1/-1;justify-content:space-between;align-items:center;display:flex}.arena-sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-primary);padding:var(--space-md);overflow-y:auto}.arena-main{grid-template-columns:1fr 1fr;gap:0;display:grid}.arena-problem{padding:var(--space-lg);border-right:1px solid var(--border-primary);overflow-y:auto}.arena-editor{flex-direction:column;display:flex}.timer{font-family:var(--font-mono);font-size:var(--font-size-2xl);color:var(--cm-cyan);font-weight:700}.timer.warning{color:var(--cm-orange)}.timer.danger{color:var(--cm-red);animation:.5s ease-in-out infinite blink}.score-display{align-items:center;gap:var(--space-lg);display:flex}.score-player{align-items:center;gap:var(--space-sm);display:flex}.score-value{font-family:var(--font-mono);font-size:var(--font-size-xl);font-weight:700}.score-value.you{color:var(--cm-cyan)}.score-value.opponent{color:var(--cm-red)}.q-tab{align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-size-sm);color:var(--text-secondary);border:1px solid #0000;font-weight:500;display:flex}.q-tab:hover{background:var(--bg-glass-hover);color:var(--text-primary)}.q-tab.active{background:var(--bg-glass);border-color:var(--border-accent);color:var(--cm-cyan)}.q-tab.solved-you{color:var(--cm-green);border-color:#00ff884d}.q-tab.solved-opponent{color:var(--cm-red);border-color:#ff2d554d}.q-points{font-family:var(--font-mono);font-size:var(--font-size-xs);color:var(--text-muted)}.verdict{border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:600;font-family:var(--font-mono);align-items:center;gap:4px;padding:4px 12px;display:inline-flex}.verdict-ac{color:var(--cm-green);background:#00ff881f;border:1px solid #00ff884d}.verdict-wa{color:var(--cm-red);background:#ff2d551f;border:1px solid #ff2d554d}.verdict-tle{color:var(--cm-orange);background:#ff8c001f;border:1px solid #ff8c004d}.verdict-pending{color:var(--cm-cyan);background:#00f0ff14;border:1px solid #00f0ff33}.delta-positive{color:var(--cm-green);font-weight:700}.delta-negative{color:var(--cm-red);font-weight:700}.console{background:var(--bg-primary);border-top:1px solid var(--border-primary);padding:var(--space-md);font-family:var(--font-mono);font-size:var(--font-size-sm);color:var(--text-secondary);min-height:100px;max-height:200px;overflow-y:auto}.console-success{color:var(--cm-green)}.console-error{color:var(--cm-red)}.auth-page{min-height:100vh;padding:var(--space-xl);justify-content:center;align-items:center;display:flex}.auth-card{width:100%;max-width:420px;padding:var(--space-2xl)}.auth-title{font-size:var(--font-size-2xl);margin-bottom:var(--space-xs);font-weight:800}.auth-subtitle{color:var(--text-secondary);font-size:var(--font-size-sm);margin-bottom:var(--space-xl)}.auth-form{gap:var(--space-md);flex-direction:column;display:flex}.auth-divider{align-items:center;gap:var(--space-md);color:var(--text-muted);font-size:var(--font-size-sm);margin:var(--space-md) 0;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--border-primary);flex:1;height:1px}@media (max-width:768px){.hero-title{font-size:var(--font-size-4xl)}.hero-stats{gap:var(--space-md);flex-direction:column}.features-grid{grid-template-columns:1fr}.navbar-nav{display:none}.arena{grid-template-columns:1fr}.arena-main{grid-template-rows:1fr 1fr;grid-template-columns:1fr}}.particles{pointer-events:none;position:absolute;inset:0;overflow:hidden}.particle{background:var(--cm-cyan);opacity:.4;border-radius:50%;width:2px;height:2px;animation:linear infinite float-up;position:absolute}@keyframes float-up{0%{opacity:0;transform:translateY(100vh)rotate(0)}10%{opacity:.4}90%{opacity:.4}to{opacity:0;transform:translateY(-10vh)rotate(720deg)}}[data-panel-resize-handle-enabled]:hover{opacity:.65;background:var(--cm-cyan)!important}[data-panel-resize-handle-enabled][data-state=drag]{opacity:.9;background:var(--cm-cyan)!important}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(32px)scale(.95)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes ping{0%{opacity:.7;transform:scale(1)}80%{opacity:0;transform:scale(1.9)}to{opacity:0;transform:scale(1.9)}}.navbar-user-btn:hover{background:var(--bg-glass-hover)}.dropdown-item{display:block}.dropdown-item:hover{background:var(--bg-glass-hover)!important;color:var(--text-primary)!important}.nav-link-item:hover{color:#fff!important;background:#ffffff12!important}.nav-signin-btn:hover{color:#fff!important;background:#ffffff12!important;border-color:#ffffff2e!important}.nav-join-btn:hover{transform:translateY(-1px);box-shadow:0 0 32px #22d3ee66!important}