@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{--color-primary:#6366f1;--color-primary-hover:#818cf8;--color-primary-light:#6366f11f;--color-primary-glow:#6366f166;--color-accent:#06b6d4;--color-accent-hover:#22d3ee;--color-accent-light:#06b6d41f;--color-success:#10b981;--color-success-light:#10b9811f;--color-warning:#f59e0b;--color-warning-light:#f59e0b1f;--color-error:#ef4444;--color-error-light:#ef44441f;--color-info:#3b82f6;--color-info-light:#3b82f61f;--color-easy:#10b981;--color-medium:#f59e0b;--color-hard:#ef4444;--bg-primary:#0a0a0f;--bg-secondary:#111118;--bg-tertiary:#1a1a26;--bg-card:#14141f;--bg-card-hover:#1c1c2e;--bg-input:#161622;--bg-code:#0d0d16;--bg-console:#0c0c12;--bg-editor:#1e1e2e;--border-color:#ffffff0f;--border-color-hover:#ffffff1f;--border-color-active:#ffffff2e;--border-color-focus:var(--color-primary);--text-primary:#e2e8f0;--text-secondary:#94a3b8;--text-muted:#64748b;--text-inverse:#0f172a;--glass-bg:#111118d9;--glass-border:#ffffff0f;--glass-blur:20px;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow:0 0 30px var(--color-primary-glow);--shadow-inset:inset 0 1px 0 #ffffff0a;--font-sans:"Inter",-apple-system,BlinkMacSystemFont,sans-serif;--font-mono:"JetBrains Mono","Fira Code","Cascadia Code",monospace;--text-xs:.75rem;--text-sm:.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--text-5xl:3rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--radius-sm:6px;--radius-md:8px;--radius-lg:12px;--radius-xl:20px;--radius-full:9999px;--transition-fast:.15s cubic-bezier(.4,0,.2,1);--transition-base:.25s cubic-bezier(.4,0,.2,1);--transition-slow:.35s cubic-bezier(.4,0,.2,1);--transition-spring:.4s cubic-bezier(.34,1.56,.64,1);--sidebar-width:260px;--header-height:52px;--max-width:1400px;--console-height:200px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6}a{color:var(--color-primary-hover);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--color-accent)}img{max-width:100%;display:block}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#ffffff14;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#ffffff26}h1,h2,h3,h4,h5,h6{color:var(--text-primary);font-weight:700;line-height:1.2}h1{font-size:var(--text-4xl)}h2{font-size:var(--text-3xl)}h3{font-size:var(--text-2xl)}h4{font-size:var(--text-xl)}code{font-family:var(--font-mono);background:var(--bg-code);color:var(--color-accent);border:1px solid var(--border-color);border-radius:4px;padding:2px 6px;font-size:.88em}pre{font-family:var(--font-mono);background:var(--bg-code);padding:var(--space-4);border-radius:var(--radius-md);border:1px solid var(--border-color);font-size:var(--text-sm);line-height:1.6;overflow-x:auto}pre code{color:var(--text-primary);background:0 0;border:none;padding:0}.btn{justify-content:center;align-items:center;gap:var(--space-2);font-family:var(--font-sans);font-size:var(--text-sm);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none;border:none;padding:8px 16px;font-weight:600;line-height:1;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--color-primary),#4f46e5);color:#fff;box-shadow:0 1px 4px #6366f140}.btn-primary:hover:not(:disabled){background:linear-gradient(135deg,var(--color-primary-hover),#6366f1);transform:translateY(-1px);box-shadow:0 2px 12px #6366f159}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover:not(:disabled){background:var(--bg-card-hover);border-color:var(--border-color-hover)}.btn-success{background:linear-gradient(135deg,var(--color-success),#059669);color:#fff}.btn-success:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 2px 12px #10b98159}.btn-danger{background:linear-gradient(135deg,var(--color-error),#dc2626);color:#fff}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{background:var(--bg-tertiary);color:var(--text-primary)}.btn-sm{font-size:var(--text-xs);border-radius:var(--radius-sm);padding:5px 10px}.btn-lg{padding:var(--space-4)var(--space-8);font-size:var(--text-base)}.btn-icon{width:32px;height:32px;padding:6px}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-5);transition:all var(--transition-base)}.card:hover{border-color:var(--border-color-hover);box-shadow:var(--shadow-md)}.card-glass{background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--glass-blur));border:1px solid var(--glass-border);border-radius:var(--radius-lg);padding:var(--space-5)}.topic-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-4);align-items:center;gap:var(--space-4);transition:all var(--transition-fast);cursor:pointer;color:inherit;text-decoration:none;display:flex}.topic-card:hover{border-color:var(--border-color-active);background:var(--bg-card-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.topic-card__icon{border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;font-size:1.3rem;display:flex}.topic-card__info{flex:1;min-width:0}.topic-card__title{font-weight:600;font-size:var(--text-sm);margin-bottom:2px}.topic-card__meta{color:var(--text-muted);font-size:11px}.progress-ring{width:36px;height:36px;position:relative}.progress-ring svg{transform:rotate(-90deg)}.progress-ring__bg{fill:none;stroke:var(--border-color);stroke-width:3px}.progress-ring__fill{fill:none;stroke-width:3px;stroke-linecap:round;transition:stroke-dashoffset var(--transition-slow)}.progress-ring__text{font-size:9px;font-weight:700;font-family:var(--font-mono);position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.input{width:100%;font-family:var(--font-sans);font-size:var(--text-sm);color:var(--text-primary);background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-fast);outline:none;padding:8px 12px}.input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.input::placeholder{color:var(--text-muted)}.textarea{resize:vertical;min-height:120px;font-family:var(--font-mono);line-height:1.5}.select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;padding-right:36px}.label{font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:var(--space-2);font-weight:500;display:block}.form-group{margin-bottom:var(--space-5)}.badge{border-radius:var(--radius-full);letter-spacing:.3px;align-items:center;padding:2px 10px;font-size:11px;font-weight:600;display:inline-flex}.badge-easy{background:var(--color-success-light);color:var(--color-easy)}.badge-medium{background:var(--color-warning-light);color:var(--color-medium)}.badge-hard{background:var(--color-error-light);color:var(--color-hard)}.badge-premium{color:#fff;background:linear-gradient(135deg,#f59e0b,#d97706)}.badge-solved,.badge-accepted{background:var(--color-success-light);color:var(--color-success)}.badge-wa{background:var(--color-error-light);color:var(--color-error)}.badge-tle{background:var(--color-warning-light);color:var(--color-warning)}.badge-re{background:var(--color-error-light);color:var(--color-error)}.kbd{font-family:var(--font-mono);color:var(--text-muted);background:var(--bg-tertiary);border:1px solid var(--border-color-hover);white-space:nowrap;border-bottom-width:2px;border-radius:4px;align-items:center;gap:2px;padding:2px 6px;font-size:10px;font-weight:600;line-height:1.2;display:inline-flex}.kbd-group{align-items:center;gap:3px;display:inline-flex}.tab-bar{border-bottom:1px solid var(--border-color);background:var(--bg-secondary);gap:0;display:flex}.tab-bar__item{font-size:var(--text-sm);color:var(--text-muted);cursor:pointer;transition:color var(--transition-fast);-webkit-user-select:none;user-select:none;font-weight:500;font-family:var(--font-sans);background:0 0;border:none;align-items:center;gap:6px;padding:10px 16px;display:flex;position:relative}.tab-bar__item:hover{color:var(--text-secondary)}.tab-bar__item--active{color:var(--text-primary)}.tab-bar__item--active:after{content:"";background:var(--color-primary);border-radius:2px 2px 0 0;height:2px;position:absolute;bottom:-1px;left:0;right:0}.tab-bar__badge{border-radius:var(--radius-full);padding:1px 6px;font-size:10px;font-weight:700;line-height:1.3}.table-container{border-radius:var(--radius-lg);border:1px solid var(--border-color);overflow-x:auto}table{border-collapse:collapse;width:100%}thead{background:var(--bg-tertiary)}th{text-align:left;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border-color);padding:10px 14px;font-size:11px;font-weight:600}td{font-size:var(--text-sm);border-bottom:1px solid var(--border-color);padding:10px 14px}tr:last-child td{border-bottom:none}tbody tr{transition:background var(--transition-fast)}tbody tr:hover{background:var(--bg-card-hover)}.split-pane{height:calc(100vh - var(--header-height));display:flex;overflow:hidden}.split-pane__left{border-right:1px solid var(--border-color);flex-direction:column;min-width:320px;display:flex;overflow-y:auto}.split-pane__right{flex-direction:column;flex:1;min-width:400px;display:flex}.split-pane__divider{cursor:col-resize;z-index:10;width:5px;transition:background var(--transition-fast);background:0 0;flex-shrink:0;position:relative}.split-pane__divider:hover,.split-pane__divider--dragging{background:var(--color-primary)}.split-pane__divider:after{content:"";background:var(--border-color-hover);width:3px;height:30px;transition:background var(--transition-fast);border-radius:2px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.split-pane__divider:hover:after{background:0 0}.console-panel{background:var(--bg-console);border-top:1px solid var(--border-color);flex-direction:column;display:flex;overflow:hidden}.console-panel__header{background:var(--bg-secondary);border-bottom:1px solid var(--border-color);color:var(--text-muted);-webkit-user-select:none;user-select:none;align-items:center;gap:8px;padding:6px 12px;font-size:11px;font-weight:600;display:flex}.console-panel__body{font-family:var(--font-mono);white-space:pre-wrap;word-break:break-all;flex:1;padding:8px 12px;font-size:12px;line-height:1.6;overflow-y:auto}.console-panel__line{padding:1px 0}.console-panel__line--error{color:var(--color-error)}.console-panel__line--success{color:var(--color-success)}.console-panel__line--info{color:var(--text-muted)}.status-bar{background:var(--bg-secondary);border-top:1px solid var(--border-color);height:24px;color:var(--text-muted);-webkit-user-select:none;user-select:none;flex-shrink:0;align-items:center;gap:12px;padding:0 10px;font-size:11px;display:flex}.status-bar__item{align-items:center;gap:4px;display:flex}.status-bar__item--right{margin-left:auto}.status-bar__item--accent{color:var(--color-primary)}.editor-toolbar{background:var(--bg-secondary);border-bottom:1px solid var(--border-color);flex-shrink:0;align-items:center;gap:8px;padding:6px 12px;display:flex}.editor-toolbar__select{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;font-size:12px;font-weight:600;font-family:var(--font-sans);outline:none;padding:4px 8px}.editor-toolbar__select:focus{border-color:var(--color-primary)}.editor-toolbar__actions{align-items:center;gap:6px;margin-left:auto;display:flex}.editor-toolbar__timer{font-family:var(--font-mono);color:var(--text-muted);align-items:center;gap:4px;font-size:12px;display:flex}.test-input{background:var(--bg-code);border:1px solid var(--border-color);border-radius:var(--radius-sm);font-family:var(--font-mono);color:var(--text-primary);resize:vertical;outline:none;width:100%;min-height:60px;padding:8px 10px;font-size:12px}.test-input:focus{border-color:var(--color-primary)}.difficulty-bar{gap:var(--space-6);padding:var(--space-4)var(--space-5);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);display:flex}.difficulty-bar__item{align-items:center;gap:var(--space-3);font-size:var(--text-sm);display:flex}.difficulty-bar__dot{border-radius:50%;width:8px;height:8px}.difficulty-bar__count{font-weight:700;font-family:var(--font-mono)}.difficulty-bar__label{color:var(--text-muted);font-size:var(--text-xs)}.header{height:var(--header-height);background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--glass-blur));border-bottom:1px solid var(--glass-border);padding:0 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var(--transition-base)}.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.stat-card__label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;font-size:11px;font-weight:600}.stat-card__value{font-size:var(--text-3xl);margin-top:var(--space-1);background:linear-gradient(135deg,var(--text-primary),var(--text-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-weight:800}.stat-card__icon{margin-bottom:var(--space-2);font-size:1.5rem}.daily-challenge{border-radius:var(--radius-lg);padding:var(--space-5);align-items:center;gap:var(--space-5);transition:all var(--transition-base);background:linear-gradient(135deg,#6366f114,#06b6d40d);border:1px solid #6366f133;display:flex}.daily-challenge:hover{border-color:#6366f159;box-shadow:0 4px 20px 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var(--border-color);gap:6px;display:flex}.terminal-hero__dot{border-radius:50%;width:10px;height:10px}.terminal-hero__line{margin-bottom:4px;line-height:1.6}.terminal-hero__prompt{color:var(--color-success)}.terminal-hero__cmd{color:var(--color-accent)}.terminal-hero__output{color:var(--text-secondary)}.terminal-hero__cursor{background:var(--color-primary);vertical-align:text-bottom;width:8px;height:16px;margin-left:2px;animation:1s step-end infinite blink;display:inline-block}.container{max-width:var(--max-width);padding:0 var(--space-5);margin:0 auto}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-1{gap:var(--space-1)}.gap-2{gap:var(--space-2)}.gap-3{gap:var(--space-3)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.gap-8{gap:var(--space-8)}.grid{display:grid}.grid-cols-2{grid-template-columns:repeat(2,1fr)}.grid-cols-3{grid-template-columns:repeat(3,1fr)}.grid-cols-4{grid-template-columns:repeat(4,1fr)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-15px)}to{opacity:1;transform:translate(0)}}@keyframes slideInRight{0%{transform:translate(100%)}to{transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes glow{0%,to{box-shadow:0 0 5px var(--color-primary-glow)}50%{box-shadow:0 0 20px var(--color-primary-glow)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes runPulse{0%{box-shadow:0 0 #10b98166}70%{box-shadow:0 0 0 8px #10b98100}to{box-shadow:0 0 #10b98100}}.animate-fade-in{animation:.4s ease-out fadeIn}.animate-slide-left{animation:.3s ease-out slideInLeft}.animate-slide-right{animation:.3s ease-out slideInRight}.animate-scale-in{animation:.2s ease-out scaleIn}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary)25%,var(--bg-card-hover)50%,var(--bg-tertiary)75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s infinite shimmer}.running-indicator{animation:1.5s infinite runPulse}.spinner{border:2px solid #fff3;border-top-color:#fff;border-radius:50%;width:14px;height:14px;animation:.6s linear infinite spin}.status-icon{justify-content:center;align-items:center;width:18px;height:18px;font-size:12px;display:flex}.status-icon--solved{color:var(--color-success)}.status-icon--attempted{color:var(--color-warning)}.status-icon--todo{color:var(--text-muted);opacity:.3}.header__user-chip{align-items:center;gap:var(--space-2);border-radius:var(--radius-full);background:var(--bg-tertiary);cursor:default;padding:4px 12px;display:flex}.header__avatar{object-fit:cover;border-radius:50%;width:24px;height:24px}.header__username{font-size:var(--text-sm);text-overflow:ellipsis;white-space:nowrap;max-width:120px;font-weight:600;overflow:hidden}.header__vip-badge{border-radius:var(--radius-full);color:#fff;background:linear-gradient(135deg,#f59e0b,#ef4444);padding:1px 6px;font-size:9px;font-weight:700}.header__skeleton{border-radius:var(--radius-md);background:var(--bg-tertiary);width:80px;height:32px;animation:1.5s infinite pulse}.header__hamburger{width:40px;height:40px;color:var(--text-primary);cursor:pointer;border-radius:var(--radius-md);transition:background var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;display:none}.header__hamburger:hover{background:var(--bg-tertiary)}.header__desktop-only{display:flex}.mobile-menu{z-index:200;position:fixed;inset:0}.mobile-menu__overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0009;animation:.2s fadeIn;position:absolute;inset:0}.mobile-menu__panel{background:var(--bg-secondary);border-left:1px solid var(--border-color);width:min(320px,85vw);height:100%;padding:var(--space-6)var(--space-5);gap:var(--space-5);flex-direction:column;animation:.25s slideInRight;display:flex;position:absolute;top:0;right:0;overflow-y:auto}.mobile-menu__user{align-items:center;gap:var(--space-3);padding:var(--space-4);background:var(--bg-tertiary);border-radius:var(--radius-lg);display:flex}.mobile-menu__avatar{object-fit:cover;border:2px solid var(--color-primary);border-radius:50%;width:44px;height:44px}.mobile-menu__avatar-placeholder{background:var(--bg-card);width:44px;height:44px;color:var(--text-muted);border-radius:50%;justify-content:center;align-items:center;display:flex}.mobile-menu__user-info{flex-direction:column;gap:2px;display:flex}.mobile-menu__name{font-weight:600;font-size:var(--text-sm)}.mobile-menu__plan{font-size:var(--text-xs);color:var(--text-muted);align-items:center;gap:var(--space-2);display:flex}.mobile-menu__nav{flex-direction:column;gap:2px;display:flex}.mobile-menu__link{align-items:center;gap:var(--space-3);padding:var(--space-3)var(--space-4);border-radius:var(--radius-md);font-size:var(--text-sm);color:var(--text-secondary);min-height:44px;transition:all var(--transition-fast);font-weight:500;text-decoration:none;display:flex}.mobile-menu__link:hover,.mobile-menu__link--active{color:var(--text-primary);background:var(--bg-tertiary)}.mobile-menu__link--primary{color:var(--color-primary);background:var(--color-primary-light)}.mobile-menu__extra{padding-top:var(--space-3);border-top:1px solid var(--border-color);flex-direction:column;gap:2px;display:flex}@media (max-width:768px){.grid-cols-2,.grid-cols-3,.grid-cols-4{grid-template-columns:1fr}.split-pane{flex-direction:column;height:auto}.split-pane__left{border-right:none;border-bottom:1px solid var(--border-color);min-width:0}.split-pane__right{min-width:0}.split-pane__divider,.header__nav{display:none}.header__desktop-only{display:none!important}.header__hamburger{display:flex}.search-trigger{min-width:auto;padding:0 var(--space-2);justify-content:center;width:36px;height:36px}.search-trigger__text,.search-trigger .kbd{display:none}.header__streak{padding:4px 8px;font-size:11px}.difficulty-bar{gap:var(--space-3);flex-wrap:wrap}.command-palette__box{width:calc(100% - 32px)}.header{padding:0 var(--space-3)}.btn{min-width:40px;min-height:40px}.btn-sm{min-height:36px}.dashboard-stats{grid-template-columns:repeat(2,1fr)!important}}@media (max-width:480px){.dashboard-stats{grid-template-columns:1fr!important}}@media (max-width:1024px){.grid-cols-4{grid-template-columns:repeat(2,1fr)}}.markdown-content h1{margin:var(--space-6)0 var(--space-4);font-size:var(--text-3xl)}.markdown-content h2{margin:var(--space-5)0 var(--space-3);font-size:var(--text-2xl);border-bottom:1px solid var(--border-color);padding-bottom:var(--space-2)}.markdown-content h3{margin:var(--space-4)0 var(--space-2);font-size:var(--text-xl)}.markdown-content p{margin-bottom:var(--space-4);color:var(--text-secondary);line-height:1.7}.markdown-content ul,.markdown-content ol{margin-bottom:var(--space-4);padding-left:var(--space-6)}.markdown-content li{margin-bottom:var(--space-2);color:var(--text-secondary)}.markdown-content blockquote{border-left:3px solid var(--color-primary);padding:var(--space-3)var(--space-4);background:var(--color-primary-light);border-radius:0 var(--radius-sm)var(--radius-sm)0;margin-bottom:var(--space-4)}.markdown-content table{margin-bottom:var(--space-4)}.markdown-content strong{color:var(--text-primary)}.toast-container{font-family:var(--font-sans)!important}