.app{position:relative;display:flex;flex-direction:column;height:100vh;overflow:hidden}.skip-link{position:absolute;left:16px;top:8px;z-index:100;padding:10px 14px;background:#f3f6ff;color:#0a0f1e;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;transform:translateY(-180%);transition:transform .2s ease}.home-page{flex:1;overflow-y:auto;min-height:0;width:100%}.home-page .learn-welcome{min-height:100%;box-sizing:border-box}.skip-link:focus,.skip-link:focus-visible{outline:2px solid #e94560;outline-offset:2px;transform:translateY(0)}.ui-label{display:inline-flex;align-items:center;gap:.62rem}.ui-label-compact{gap:.48rem}.ui-icon{width:1rem;height:1rem;flex-shrink:0}.ui-icon-small{width:.92rem;height:.92rem}.brand-mark{display:block;width:100%;height:100%}.app-header{display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:50px;background:linear-gradient(135deg,#16213e,#0f3460);border-bottom:1px solid #1a3a6a;flex-shrink:0}.header-left{display:flex;align-items:center;gap:12px}.header-logo{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;background:linear-gradient(180deg,#14233ff2,#081120f2);border:1px solid rgba(122,160,222,.26);border-radius:12px;padding:0;cursor:pointer;box-shadow:0 10px 18px #02081238}.header-logo:hover{transform:translateY(-1px)}.header-logo-mark{width:28px;height:28px}.header-brand-copy{display:flex;flex-direction:column;gap:2px}.header-title{font-size:18px;font-weight:600;color:#fff}.header-title-link{background:none;border:none;padding:0;font:inherit;color:inherit;cursor:pointer}.header-title-link:hover{opacity:.8}.header-subtitle{font-size:12px;color:#8892b0;margin-left:0}.header-right{display:flex;align-items:center;flex-wrap:wrap;gap:12px}.header-waitlist-button{padding:7px 12px;background:#1c3056eb;color:#d8e2f5;border:1px solid rgba(141,192,255,.38);border-radius:999px;cursor:pointer;font-size:12px;font-weight:700;letter-spacing:.02em;transition:background .2s ease,color .2s ease,border-color .2s ease}.header-waitlist-button:hover{background:#12264af5;color:#fff;border-color:#b4d6ff8f}.header-pricing-cta{padding:7px 12px;background:linear-gradient(135deg,#f0b35b,#d88a2f);color:#241503;border:none;border-radius:999px;cursor:pointer;font-size:12px;font-weight:800;letter-spacing:.02em;transition:transform .2s ease,box-shadow .2s ease;box-shadow:0 10px 22px #d88a2f3d}.header-pricing-cta:hover{transform:translateY(-1px);box-shadow:0 14px 24px #d88a2f47}.header-contact-button{padding:7px 12px;background:#0c172ed9;color:#d6e4ff;border:1px solid rgba(120,146,194,.34);border-radius:999px;cursor:pointer;font-size:12px;font-weight:700;letter-spacing:.02em;transition:background .2s ease,color .2s ease,border-color .2s ease}.header-contact-button:hover,.header-contact-button.active{background:#132a52eb;color:#fff;border-color:#8dc0ff80}.header-link{color:#8892b0;text-decoration:none;font-size:14px;transition:color .2s}.header-link:hover{color:#e94560}.header-nav{display:flex;gap:4px}.header-nav-button{padding:6px 14px;background:transparent;color:#8892b0;border:1px solid transparent;border-radius:6px;cursor:pointer;font-size:13px;transition:all .2s}.header-nav-button:hover{background:#0f3460;color:#fff}.header-nav-button.active{background:#0f3460;color:#e94560;border-color:#1a3a6a;font-weight:600}.app-body{display:flex;flex:1;overflow:hidden}.app-body:focus{outline:2px solid #e94560;outline-offset:-2px}.sidebar{display:flex;flex-direction:column;background:#16213e;border-right:1px solid #1a3a6a;transition:width .3s;position:relative;flex-shrink:0}.sidebar.open{width:280px}.sidebar.closed{width:36px}.sidebar-toggle{position:absolute;right:-1px;top:8px;width:28px;height:28px;background:#0f3460;border:1px solid #1a3a6a;color:#8892b0;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:10px;border-radius:4px 0 0 4px;z-index:10}.sidebar-toggle:hover{background:#1a3a6a;color:#fff}.free-mode-button{margin:12px 12px 4px;padding:8px 12px;background:#0f3460;color:#e0e0e0;border:1px solid #1a3a6a;border-radius:6px;cursor:pointer;font-size:13px;transition:all .2s}.free-mode-button:hover{background:#e94560;color:#fff;border-color:#e94560}.problem-list{flex:1;overflow-y:auto}.problem-list-header{padding:12px 16px 8px}.problem-list-header h2{font-size:14px;color:#8892b0;font-weight:600}.learning-path-panel{margin-bottom:12px;padding:10px;background:#101b33;border:1px solid #1a3a6a;border-radius:8px}.learning-path-title{margin:0;color:#fff;font-size:13px}.learning-path-description,.learning-path-progress,.learning-path-next,.learning-path-course{margin:6px 0 0;color:#a5b3d1;font-size:12px;line-height:1.5}.learning-path-next{color:#c0c8d8;font-weight:600}.learning-path-course{color:#8dc0ff}.problem-list-mode-toggle{display:flex;gap:8px;margin-top:10px}.problem-list-mode-button{flex:1;padding:7px 10px;background:transparent;border:1px solid #1a3a6a;border-radius:6px;color:#c0c8d8;cursor:pointer;font-size:12px}.problem-list-mode-button.active{background:#0f3460;border-color:#e94560;color:#fff}.problem-list-body{padding:0 8px 12px}.problem-category{margin-bottom:8px}.course-category-description{margin:0 8px 8px;color:#7f90b2;font-size:12px;line-height:1.5}.category-title{font-size:11px;text-transform:uppercase;color:#a5b3d1;padding:8px 8px 4px;letter-spacing:.5px}.problem-item{display:flex;align-items:center;justify-content:space-between;width:100%;padding:8px 10px;background:transparent;border:none;color:#c0c8d8;cursor:pointer;font-size:13px;border-radius:6px;transition:all .15s;text-align:left}.problem-item:hover{background:#1a3a6a}.problem-item.selected{background:#0f3460;color:#fff;border-left:3px solid #e94560}.problem-item.recommended{background:#4caf501f;border-left:3px solid #4caf50}.problem-item.standard-preview{background:#c9a22714}.problem-item.standard-preview:hover{background:#c9a22729}.problem-item.standard-preview.selected,.problem-item.standard-preview.selected:hover{background:#0f3460}.problem-item.standard-preview.recommended,.problem-item.standard-preview.recommended:hover{background:#4caf501f}.problem-shortcuts{margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid #1a3a6a}.problem-search-empty{margin:12px 8px 0;color:#8892b0;font-size:12px}.problem-shortcut-section+.problem-shortcut-section{margin-top:8px}.problem-shortcut-title{padding:6px 8px 4px;color:#7f90b2;font-size:11px;letter-spacing:.4px}.problem-item.compact{padding:7px 10px}.problem-title-stack{display:flex;flex:1;min-width:0;flex-direction:column;gap:2px}.problem-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.problem-subtitle{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#7f90b2;font-size:11px}.difficulty-badge{font-size:10px;padding:2px 6px;border-radius:8px;color:#fff;font-weight:600;flex-shrink:0;margin-left:8px}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.problem-view{background:#16213e;border-bottom:1px solid #1a3a6a;padding:16px 20px;overflow-y:auto;max-height:40%;flex-shrink:0}.problem-header h2{font-size:18px;color:#fff;margin-bottom:12px}.problem-description{color:#c0c8d8;font-size:14px;line-height:1.7}.problem-description h3{color:#e94560;font-size:16px;margin:12px 0 8px}.problem-description h4{color:#e94560;font-size:14px;margin:10px 0 6px}.problem-description p{margin:4px 0}.problem-description ul,.problem-description ol{padding-left:20px;margin:4px 0}.problem-description li{margin:2px 0}.md-code{background:#0a0f1e;border:1px solid #1a3a6a;border-radius:6px;padding:10px 14px;margin:8px 0;font-size:13px;color:#abb2bf;overflow-x:auto}.md-inline-code{background:#0a0f1e;color:#e06c75;padding:1px 5px;border-radius:3px;font-size:13px}.problem-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.bookmark-button,.hint-button,.solution-button{padding:6px 14px;border:1px solid #1a3a6a;background:#0f3460;color:#c0c8d8;border-radius:6px;cursor:pointer;font-size:13px;transition:all .2s}.bookmark-button:hover,.hint-button:hover,.solution-button:hover{background:#1a3a6a;color:#fff}.bookmark-button.active{background:#5a3b00;border-color:#c69214;color:#ffe6a8}.hint-box{margin-top:10px;padding:10px 14px;background:#1a3a1a;border:1px solid #2a5a2a;border-radius:6px;color:#a0d0a0;font-size:13px}.solution-box{margin-top:10px;padding:10px 14px;background:#1a1a3a;border:1px solid #2a2a6a;border-radius:6px;color:#a0a0d0;font-size:13px}.solution-box pre{margin-top:8px;padding:8px 12px;background:#0a0f1e;border-radius:4px;font-size:13px;overflow-x:auto}.editor-output-container{display:flex;flex:1;overflow:hidden;min-height:0}.editor-container{flex:1;display:flex;flex-direction:column;border-right:1px solid #1a3a6a;min-width:0}.editor-toolbar{display:flex;align-items:center;justify-content:space-between;padding:6px 12px;background:#0f3460;border-bottom:1px solid #1a3a6a;flex-shrink:0}.editor-label{font-size:12px;color:#8892b0;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.editor-actions{display:flex;align-items:center;gap:10px}.shortcut-hint{font-size:11px;color:#a5b3d1}.run-button{padding:5px 16px;background:#e94560;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:13px;font-weight:600;transition:background .2s}.run-button:hover{background:#c73652}.editor-body{flex:1;overflow:hidden}.editor-body .cm-editor{height:100%}.editor-body .cm-scroller{overflow:auto}.output-container{flex:1;display:flex;flex-direction:column;min-width:0}.output-toolbar{display:flex;align-items:center;justify-content:space-between;padding:6px 12px;background:#0f3460;border-bottom:1px solid #1a3a6a;flex-shrink:0}.output-label{font-size:12px;color:#8892b0;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.judge-badge{font-size:13px;padding:3px 10px;border-radius:12px;font-weight:600}.judge-badge.correct{background:#1a3a1a;color:#4caf50;border:1px solid #2a5a2a}.judge-badge.incorrect{background:#3a1a1a;color:#f44336;border:1px solid #5a2a2a}.output-body{flex:1;padding:12px 16px;overflow-y:auto;background:#0a0f1e}.output-error{display:flex;align-items:flex-start;gap:8px;color:#f44336;font-size:14px;line-height:1.5}.error-icon{font-size:18px;flex-shrink:0}.output-section{margin-bottom:12px}.output-section-label{font-size:11px;color:#a5b3d1;text-transform:uppercase;margin-bottom:4px;letter-spacing:.5px}.output-text{color:#abb2bf;font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word}.output-return{color:#98c379;font-size:14px;font-weight:600}.output-placeholder{color:#7f90b2;font-size:14px;text-align:center;padding:40px 20px}.judge-details{margin-top:16px;padding-top:16px;border-top:1px solid #1a3a6a}.judge-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-bottom:12px}.judge-summary-item{display:flex;flex-direction:column;gap:4px;padding:10px 12px;background:#101a32;border:1px solid #1a3a6a;border-radius:10px}.judge-summary-label{font-size:11px;color:#8892b0;text-transform:uppercase;letter-spacing:.5px}.judge-summary-value{color:#fff;font-size:18px;font-weight:700}.judge-case-list{display:flex;flex-direction:column;gap:10px}.judge-case{padding:12px;background:#101a32;border:1px solid #1a3a6a;border-radius:10px}.judge-case.passed{border-color:#234d39}.judge-case.failed{border-color:#5a2a2a;background:#171221}.judge-case-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.judge-case-label{color:#fff;font-size:14px;font-weight:600}.judge-case-meta{margin-top:4px;color:#8892b0;font-size:12px}.judge-case-status{flex-shrink:0;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700}.judge-case-status.passed{background:#1a3a1a;border:1px solid #2a5a2a;color:#4caf50}.judge-case-status.failed{background:#3a1a1a;border:1px solid #5a2a2a;color:#f44336}.judge-case-note{margin:10px 0 0;color:#c0c8d8;font-size:13px;line-height:1.5}.judge-mismatch-list{list-style:none;padding:0;margin:10px 0 0;display:flex;flex-direction:column;gap:10px}.judge-mismatch-item{padding:10px;background:#0a0f1e;border:1px solid #25334f;border-radius:8px}.judge-mismatch-field{color:#fff;font-size:13px;font-weight:600}.judge-mismatch-values{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px;margin-top:8px}.judge-mismatch-label{color:#8892b0;font-size:11px;text-transform:uppercase;letter-spacing:.5px}.judge-mismatch-value{margin:4px 0 0;color:#d7def0;font-size:13px;line-height:1.5;white-space:pre-wrap;word-break:break-word}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#0a0f1e}::-webkit-scrollbar-thumb{background:#1a3a6a;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#2a4a7a}@media(max-width:768px){.sidebar.open{width:220px}.editor-output-container{flex-direction:column}.editor-container{border-right:none;border-bottom:1px solid #1a3a6a}}@media(max-width:640px){.app-header{height:auto;padding:10px 12px;flex-wrap:wrap;gap:8px;align-items:center}.header-left{flex:1 1 auto;min-width:0;gap:8px}.header-title{min-width:0;font-size:16px}.header-title-link{text-align:left}.header-subtitle{display:none}.header-nav{order:3;flex:1 0 100%;overflow-x:auto;padding-bottom:2px}.header-nav-button{flex:0 0 auto;white-space:nowrap;padding:6px 10px}.header-right{margin-left:auto;gap:8px}.header-pricing-cta,.header-waitlist-button,.header-contact-button{padding:6px 10px;font-size:11px}.learn-page{flex-direction:column}.sidebar{width:100%;border-right:none;border-bottom:1px solid #1a3a6a}.sidebar.open{width:100%;max-height:min(320px,45vh)}.sidebar.closed{width:100%;height:44px}.pricing-cta-banner{flex-direction:column;align-items:flex-start}.pricing-cta-button,.pricing-cta-actions{width:100%}.pricing-cta-actions>button,.pricing-inline-actions>button{width:100%}.pricing-inline-actions{flex-direction:column}.pricing-guide-grid{grid-template-columns:1fr}.pricing-guide-modal{padding:20px}.pricing-page-container{padding:24px 16px 32px}.pricing-page-actions{justify-content:stretch}.pricing-page-actions>button{width:100%}.contact-page-grid{grid-template-columns:1fr}.contact-page-header,.contact-page-note{padding-left:20px;padding-right:20px}.sidebar-toggle{right:8px;top:8px;border-radius:4px}.learn-welcome{padding:24px 16px}.home-page .learn-welcome{align-items:flex-start;padding-bottom:32px}.welcome-brand{align-items:flex-start}.welcome-content h2{font-size:24px}.welcome-actions{flex-direction:column}.problems-page-header{flex-direction:column;align-items:stretch;gap:16px;padding:20px 16px 16px}.problems-page-actions{flex-direction:column}.problems-page-body{padding:16px}.problem-card-grid{grid-template-columns:1fr}.problem-card-button{width:100%;align-self:stretch}.learn-empty-state{padding:16px}.learn-empty-card{padding:24px 16px}.guide-start-button,.start-coding-button{width:100%;max-width:100%;box-sizing:border-box}.learn-actions,.problem-view{padding:12px 16px}.editor-page-header{flex-wrap:wrap;gap:8px;padding:8px 12px}.current-problem-label{width:100%;font-size:13px}.header-brand-copy{min-width:0}.repl-header{flex-wrap:wrap;gap:8px;padding:8px 12px}.repl-subtitle{flex-basis:100%;order:3}.repl-output,.repl-input-area{padding-left:12px;padding-right:12px}}.sidebar-toggle:focus-visible,.free-mode-button:focus-visible,.guide-mode-button:focus-visible,.run-button:focus-visible,.problem-item:focus-visible,.hint-button:focus-visible,.solution-button:focus-visible,.header-link:focus-visible,.start-coding-button:focus-visible,.back-to-learn:focus-visible,.guide-start-button:focus-visible,.problem-card-button:focus-visible{outline:2px solid #e94560;outline-offset:2px}.learn-page{display:flex;flex:1;overflow:hidden;width:100%}.learn-main{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.learn-problem-area{flex:1;display:flex;flex-direction:column;overflow-y:auto}.learn-course-card{margin:20px 20px 0;padding:18px 20px;border:1px solid #244a7d;border-radius:16px;background:linear-gradient(145deg,#101d33f5,#16355feb);box-shadow:0 18px 36px #040a1638}.learn-course-card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.learn-course-eyebrow{margin:0 0 6px;color:#8dc0ff;font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.learn-course-card h3{margin:0;color:#f4f7ff;font-size:22px}.learn-course-tier{display:inline-flex;align-items:center;justify-content:center;padding:6px 10px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.learn-course-tier.free{background:#66bb6a2e;color:#d8f6de}.learn-course-tier.standard{background:#4f8ef733;color:#d8e7ff}.learn-course-description{margin:12px 0 0;color:#cfdbef;line-height:1.6}.learn-course-stats{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.learn-course-stat{padding:6px 10px;border-radius:999px;background:#ffffff14;color:#e8eef9;font-size:12px;font-weight:600}.learn-course-next{margin:14px 0 0;color:#9fd4ff;font-size:13px;font-weight:600}.pricing-cta-banner{margin:20px 20px 0;padding:18px 20px;border-radius:16px;display:flex;align-items:center;justify-content:space-between;gap:20px}.pricing-cta-banner.free{border:1px solid rgba(216,138,47,.38);background:linear-gradient(145deg,#38250deb,#5c390eeb)}.pricing-cta-banner.standard{border:1px solid rgba(79,142,247,.36);background:linear-gradient(145deg,#121e37f5,#192f5af5)}.pricing-cta-copy{min-width:0}.pricing-cta-eyebrow{margin:0 0 8px;color:#ffd9a3;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.pricing-cta-copy h3{margin:0;color:#fff5e5;font-size:20px}.pricing-cta-copy p:last-child{margin:10px 0 0;color:#f1dfc3;font-size:14px;line-height:1.7}.pricing-cta-actions{display:flex;flex-direction:column;gap:10px;flex-shrink:0;align-items:stretch}.pricing-cta-button,.pricing-inline-link,.pricing-guide-primary{padding:10px 16px;background:#f0b35b;color:#241503;border:none;border-radius:10px;cursor:pointer;font-size:14px;font-weight:700;transition:background .2s ease,transform .2s ease}.pricing-cta-button:hover,.pricing-inline-link:hover,.pricing-guide-primary:hover{background:#ffd18c;transform:translateY(-1px)}.pricing-inline-note{margin-top:20px;padding-top:18px;border-top:1px solid rgba(165,179,209,.18)}.pricing-inline-actions{display:flex;flex-wrap:wrap;gap:10px}.pricing-inline-note p{margin:0 0 12px;color:#a5b3d1;font-size:13px;line-height:1.6}.waitlist-cta-note{margin:10px 0 0;color:#c8d4ea;font-size:12px;line-height:1.7}.pricing-inline-link{background:transparent;color:#ffd18c;border:1px solid rgba(240,179,91,.38)}.waitlist-cta-button{color:#d8e2f5;background:#0c172e73;border-color:#8dc0ff61}.waitlist-cta-button:hover{background:#12264adb;color:#fff}.pricing-guide-backdrop{position:fixed;inset:0;z-index:150;display:flex;align-items:center;justify-content:center;padding:24px;background:#070b18c2;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.pricing-guide-modal{width:min(640px,100%);padding:24px;background:linear-gradient(160deg,#101b33,#16213e);border:1px solid rgba(95,134,195,.34);border-radius:24px;box-shadow:0 28px 48px #040a1666}.pricing-guide-header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.pricing-guide-eyebrow{margin:0 0 8px;color:#8dc0ff;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.pricing-guide-header h2{margin:0;color:#fff;font-size:28px}.pricing-guide-close{width:36px;height:36px;background:transparent;color:#c5d3f0;border:1px solid rgba(148,171,216,.26);border-radius:50%;cursor:pointer;font-size:20px}.pricing-guide-summary,.pricing-guide-note{color:#c8d4ea;font-size:14px;line-height:1.7}.pricing-guide-summary{margin:16px 0 0}.pricing-guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:20px}.pricing-guide-plan{padding:18px;border-radius:18px;border:1px solid rgba(120,145,193,.26);background:#0a0f1e66}.pricing-guide-plan.free{border-color:#70cb804d}.pricing-guide-plan.standard{border-color:#f0b35b57}.pricing-guide-plan.supporter{border-color:#7eb4ff57}.pricing-guide-plan-label{margin:0;color:#8dc0ff;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.pricing-guide-plan h3{margin:10px 0 0;color:#fff;font-size:18px}.pricing-guide-plan ul{margin:14px 0 0;padding-left:18px;color:#dce5f6;line-height:1.8}.pricing-guide-note{margin:18px 0 0}.pricing-guide-actions{display:flex;justify-content:flex-end;margin-top:18px}.pricing-page{flex:1;overflow-y:auto;width:100%;background:radial-gradient(circle at top right,rgba(240,179,91,.12),transparent 24%),linear-gradient(180deg,#0b1222,#0a0f1e 45%,#08101f)}.pricing-page-container{max-width:1080px;margin:0 auto;padding:32px 32px 40px}.pricing-page-hero,.pricing-page-note-panel{width:100%;box-sizing:border-box}.pricing-page-context{margin-top:18px;padding:16px 18px;border-radius:16px;background:#070b184d;border:1px solid rgba(95,134,195,.2)}.pricing-page-context p{margin:0;color:#d8e2f5;line-height:1.8}.pricing-page-context p+p{margin-top:8px}.pricing-page-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.pricing-page-status{display:inline-flex;align-items:center;margin:10px 0 0;padding:4px 10px;border-radius:999px;font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.pricing-page-status.available{background:#70cb8029;color:#9fe0a7}.pricing-page-status.planned{background:#f0b35b29;color:#ffd594}.pricing-page-status.draft{background:#7eb4ff29;color:#9fceff}.pricing-page-note-panel{margin-top:20px}.pricing-page-actions{display:flex;justify-content:flex-end;gap:12px;flex-wrap:wrap;margin-top:18px}.pricing-page-secondary{padding:10px 18px;background:transparent;color:#d8e2f5;border:1px solid rgba(141,192,255,.38);border-radius:999px;cursor:pointer;font-size:14px;font-weight:700;transition:background .2s ease,color .2s ease,border-color .2s ease}.pricing-page-secondary:hover{background:#12264adb;color:#fff;border-color:#b4d6ff8f}.learn-problem-area .problem-view{max-height:none;flex:0 0 auto;overflow:visible}.learn-actions{padding:12px 20px 0;background:transparent;border-top:none;display:flex;justify-content:flex-start;flex-shrink:0}.learn-problem-area>.learn-actions:last-child{padding:16px 20px 20px;justify-content:center}.start-coding-button{padding:10px 28px;background:#e94560;color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:15px;font-weight:600;transition:all .2s}.start-coding-button:hover{background:#c73652;transform:translateY(-1px)}.guide-mode-button{margin:12px 12px 4px;padding:8px 12px;background:#0f3460;color:#e0e0e0;border:1px solid #1a3a6a;border-radius:6px;cursor:pointer;font-size:13px;transition:all .2s}.guide-mode-button:hover{background:#1a3a6a;color:#fff}.guide-mode-button.active{background:#e94560;color:#fff;border-color:#e94560}.learn-search-panel{margin:12px 12px 4px}.learn-search-label{display:block;margin-bottom:6px;color:#c0c8d8;font-size:12px;font-weight:600}.learn-search-input{width:100%;padding:9px 10px;background:#0a0f1e;color:#e0e0e0;border:1px solid #1a3a6a;border-radius:8px;font-size:13px}.learn-search-input::placeholder{color:#7f90b2}.learn-search-meta{margin-top:6px;color:#7f90b2;font-size:11px;line-height:1.5}.guide-search-results{margin:4px 12px 8px;padding:10px;background:#101b33;border:1px solid #1a3a6a;border-radius:8px}.guide-search-results-title{margin-bottom:8px;color:#c0c8d8;font-size:12px}.guide-search-result-button{width:100%;padding:8px 10px;background:transparent;border:1px solid transparent;border-radius:6px;color:#c0c8d8;cursor:pointer;font-size:13px;text-align:left}.guide-search-result-button:hover{background:#1a3a6a;color:#fff}.guide-search-result-button.active{background:#0f3460;border-color:#e94560;color:#fff}.guide-search-empty{color:#8892b0;font-size:12px}.learn-welcome{flex:1;display:flex;align-items:center;justify-content:center;padding:40px}.welcome-content{max-width:600px;text-align:center}.welcome-brand{display:flex;align-items:center;gap:16px;margin-bottom:10px}.welcome-brand-shell{width:58px;height:58px;flex-shrink:0;border-radius:18px;padding:8px;background:linear-gradient(180deg,#0c172cf2,#07101ffa);border:1px solid rgba(123,161,222,.22);box-shadow:0 18px 32px #03091442}.welcome-eyebrow{margin:0 0 8px;font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#92b4ff}.welcome-content h2{font-size:28px;color:#fff;margin-bottom:8px}.welcome-content>p{color:#8892b0;font-size:16px;margin-bottom:12px}.welcome-content>p.welcome-subcopy{font-size:15px;margin-bottom:32px}.welcome-steps{text-align:left;margin-bottom:32px}.welcome-step{display:flex;align-items:flex-start;gap:16px;margin-bottom:20px}.step-number{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:#e94560;color:#fff;border-radius:50%;font-size:16px;font-weight:700;flex-shrink:0}.welcome-step strong{color:#fff;font-size:15px}.welcome-step p{color:#8892b0;font-size:13px;margin:4px 0 0}.welcome-actions{display:flex;flex-wrap:wrap;gap:16px;justify-content:center}.guide-start-button{padding:10px 24px;background:#0f3460;color:#e0e0e0;border:1px solid #1a3a6a;border-radius:8px;cursor:pointer;font-size:15px;font-weight:600;transition:all .2s}.guide-start-button:hover{background:#1a3a6a;color:#fff}.problems-page{display:flex;flex-direction:column;flex:1;overflow:hidden;width:100%}.problems-page-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 28px 20px;background:#16213e;border-bottom:1px solid #1a3a6a}.problems-page-header h2{font-size:24px;color:#fff;margin-bottom:8px}.problems-page-header p{color:#a5b3d1;font-size:14px}.problems-page-actions{display:flex;gap:12px;flex-shrink:0}.problems-page-body{flex:1;overflow-y:auto;padding:24px 28px 32px}.problem-section{margin-bottom:28px}.problem-section-title{font-size:18px;color:#fff;margin-bottom:14px}.problem-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}.problem-card{display:flex;flex-direction:column;gap:12px;padding:18px;background:#16213e;border:1px solid #1a3a6a;border-radius:14px}.problem-card.selected{border-color:#e94560;box-shadow:0 0 0 1px #e9456040}.problem-card-header{display:flex;align-items:center;justify-content:space-between;gap:8px}.problem-card-difficulty,.problem-card-current{display:inline-flex;align-items:center;padding:4px 8px;border-radius:999px;font-size:12px;font-weight:600}.problem-card-difficulty{background:#0f3460;color:#d8e4ff}.problem-card-current{background:#e9456029;color:#ff8ea0}.problem-card h4{font-size:18px;color:#fff}.problem-card p{color:#a5b3d1;font-size:14px;line-height:1.6;flex:1}.problem-card-button{align-self:flex-start;padding:9px 16px;background:#e94560;color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:14px;font-weight:600}.problem-card-button:hover{background:#c73652}.learn-empty-state{flex:1;display:flex;align-items:center;justify-content:center;padding:24px}.learn-empty-card{max-width:480px;padding:28px;background:#16213e;border:1px solid #1a3a6a;border-radius:16px;text-align:center}.learn-empty-card h2{font-size:24px;color:#fff;margin-bottom:10px}.learn-empty-card p{color:#a5b3d1;font-size:14px;line-height:1.7;margin-bottom:24px}.editor-page{display:flex;flex-direction:column;flex:1;overflow:hidden;width:100%}.editor-page-header{display:flex;align-items:center;gap:16px;padding:8px 16px;background:#16213e;border-bottom:1px solid #1a3a6a;flex-shrink:0}.back-to-learn{padding:6px 14px;background:#0f3460;color:#c0c8d8;border:1px solid #1a3a6a;border-radius:6px;cursor:pointer;font-size:13px;transition:all .2s}.back-to-learn:hover{background:#1a3a6a;color:#fff}.back-to-problem{margin-left:auto}.current-problem-label{font-size:14px;color:#c0c8d8;font-weight:600}.lisp-guide{flex:1;overflow-y:auto;background:#0d1b2a}.guide-content{max-width:800px;margin:0 auto;padding:24px 32px 48px}.guide-main-title{font-size:24px;color:#fff;margin-bottom:24px;padding-bottom:12px;border-bottom:2px solid #e94560}.guide-search-summary{margin-bottom:18px;padding:12px 16px;background:#101b33;color:#c0c8d8;border:1px solid #1a3a6a;border-radius:8px;font-size:13px}.guide-section{margin-bottom:28px;padding:20px;background:#16213e;border-radius:8px;border:1px solid #1a3a6a}.guide-section h3{font-size:18px;color:#e94560;margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid #1a3a6a}.guide-section h4{font-size:15px;color:#e9a045;margin:16px 0 8px}.guide-section p{color:#c0c8d8;font-size:14px;line-height:1.7;margin:8px 0}.guide-section code{background:#0a0f1e;color:#e06c75;padding:1px 5px;border-radius:3px;font-size:13px}.guide-code{background:#0a0f1e;border:1px solid #1a3a6a;border-radius:6px;padding:12px 16px;margin:10px 0;font-size:13px;color:#abb2bf;overflow-x:auto;line-height:1.6;white-space:pre;font-family:Cascadia Code,Fira Code,Consolas,monospace}.guide-note{margin:12px 0;padding:12px 16px;background:#1a2a3a;border-left:3px solid #e9a045;border-radius:0 6px 6px 0;color:#c0c8d8;font-size:13px;line-height:1.6}.guide-note-label{color:#9dc1ff}.guide-note code{background:#0a0f1e;color:#e06c75;padding:1px 5px;border-radius:3px;font-size:12px}.guide-table{width:100%;border-collapse:collapse;margin:10px 0;font-size:13px}.guide-table th{background:#0f3460;color:#fff;padding:8px 12px;text-align:left;border:1px solid #1a3a6a}.guide-table td{padding:8px 12px;color:#c0c8d8;border:1px solid #1a3a6a;background:#0d1b2a}.guide-table code{background:#0a0f1e;color:#e06c75;padding:1px 4px;border-radius:3px;font-size:12px}.guide-references ul{list-style:none;padding:0}.reference-list li{margin-bottom:12px;padding:10px 14px;background:#0d1b2a;border-radius:6px;border:1px solid #1a3a6a}.reference-list a{color:#61dafb;text-decoration:none;font-size:14px}.reference-list a:hover{text-decoration:underline;color:#8aecff}.ref-desc{color:#8892b0;font-size:13px}.guide-footer{text-align:center;margin-top:32px;padding-top:24px;border-top:1px solid #1a3a6a}.guide-footer p{color:#8892b0;font-size:14px;margin-bottom:16px}.guide-footer .guide-start-button{font-size:14px}.repl-page{display:flex;flex-direction:column;height:100%;overflow:hidden;background:#0a0f1e}.repl-header{display:flex;align-items:center;gap:12px;padding:8px 16px;background:#111827;border-bottom:1px solid #1e293b;flex-shrink:0}.repl-title{font-size:16px;font-weight:600;color:#fff;margin:0}.repl-subtitle{font-size:12px;color:#8892b0}.repl-clear-button{margin-left:auto;background:#1e293b;border:1px solid #334155;color:#8892b0;padding:4px 12px;border-radius:4px;cursor:pointer;font-size:12px;transition:background .2s,color .2s}.repl-clear-button:hover{background:#334155;color:#fff}.repl-output{flex:1;overflow-y:auto;padding:12px 16px;font-family:JetBrains Mono,Fira Code,Consolas,monospace;font-size:14px;line-height:1.6}.repl-welcome{color:#8892b0;margin-bottom:16px}.repl-welcome p{margin:4px 0}.repl-welcome kbd{background:#1e293b;border:1px solid #334155;border-radius:3px;padding:1px 5px;font-size:12px;color:#e2e8f0}.repl-welcome-example{margin-top:8px}.repl-welcome-example code{background:#1e293b;padding:2px 6px;border-radius:3px;color:#7dd3fc}.repl-entry{margin-bottom:8px}.repl-prompt-line{display:flex;align-items:flex-start;gap:8px}.repl-prompt{color:#e94560;font-weight:700;flex-shrink:0;-webkit-user-select:none;user-select:none}.repl-input-text{color:#e2e8f0;margin:0;white-space:pre-wrap;word-break:break-all}.repl-output-text{color:#a3e635;margin:2px 0 2px 40px;white-space:pre-wrap}.repl-return{color:#7dd3fc;margin-left:40px}.repl-error{color:#f87171;margin-left:40px}.repl-input-area{display:flex;align-items:center;gap:8px;padding:8px 16px;background:#111827;border-top:1px solid #1e293b;flex-shrink:0}.repl-input{flex:1;background:#1e293b;border:1px solid #334155;border-radius:4px;color:#e2e8f0;font-family:JetBrains Mono,Fira Code,Consolas,monospace;font-size:14px;padding:8px 12px;resize:none;outline:none;line-height:1.5}.repl-input:focus{border-color:#e94560}.repl-input::placeholder{color:#4b5563}.repl-submit-button{background:#e94560;border:none;color:#fff;width:36px;height:36px;border-radius:4px;cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .2s}.repl-submit-button:hover:not(:disabled){background:#d6304a}.repl-submit-button:disabled{opacity:.4;cursor:default}.category-title{display:flex;align-items:center;justify-content:space-between}.category-progress{font-size:10px;color:#7f90b2}.problem-item.solved{color:#d7f6df}.problem-item-meta{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;margin-left:8px;justify-content:flex-end}.problem-status-icon{color:#4caf50;font-size:12px;font-weight:700}.problem-status-icon .ui-icon{width:.92rem;height:.92rem}.problem-status-icon.bookmarked{color:#f6c453}.problem-status-icon.locked-preview{color:#ffd479}.problem-meta-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}.problem-meta-chip{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:#0f3460;color:#d8e4ff;font-size:12px;font-weight:600}.problem-meta-chip.solved{background:#4caf5024;border:1px solid rgba(76,175,80,.32);color:#89d99a}.problem-meta-chip.tier.free{background:#4caf5024;border:1px solid rgba(76,175,80,.28);color:#c7f1cf}.problem-meta-chip.tier.standard{background:#c9a22724;border:1px solid rgba(201,162,39,.28);color:#ffe2a6}.problem-access-note{margin-bottom:14px;padding:12px 14px;border-radius:10px;font-size:13px;line-height:1.6}.problem-access-note.standard-preview{background:#c9a2271f;border:1px solid rgba(201,162,39,.3);color:#ffe2a6}.problem-tier-badge{display:inline-flex;align-items:center;justify-content:center;padding:2px 8px;border-radius:999px;font-size:10px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;flex-shrink:0}.problem-tier-badge.free{background:#4caf502e;color:#d9f6df}.problem-tier-badge.standard{background:#c9a22733;color:#ffe2a6}.problem-goals{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}.problem-goal-chip{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:#e9456024;color:#ff9cac;font-size:12px;font-weight:600}.practice-dashboard{display:flex;flex-direction:column;gap:18px;margin-bottom:28px}.practice-stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}.practice-stat-card{display:flex;flex-direction:column;gap:8px;padding:16px 18px;background:#16213e;border:1px solid #1a3a6a;border-radius:14px}.practice-stat-label{font-size:12px;color:#a5b3d1;text-transform:uppercase;letter-spacing:.4px}.practice-stat-value{font-size:24px;color:#fff}.practice-recommendation{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:20px 22px;background:linear-gradient(135deg,#0f3460eb,#16213ef5);border:1px solid #2a4a7a;border-radius:16px}.practice-recommendation.completed{border-color:#4caf5059}.practice-recommendation-copy{display:flex;flex-direction:column;gap:6px}.practice-recommendation-label{font-size:12px;color:#9ec6ff;text-transform:uppercase;letter-spacing:.5px}.practice-recommendation h3{color:#fff;font-size:22px}.practice-recommendation p{color:#c1d3f7;font-size:14px;line-height:1.6}.problem-section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.problem-section-progress{display:inline-flex;align-items:center;padding:5px 10px;border-radius:999px;background:#0f3460;color:#d8e4ff;font-size:12px;font-weight:600}.problem-card.solved{border-color:#4caf5052}.problem-card.recommended{border-color:#9ec6ff73;box-shadow:0 0 0 1px #9ec6ff1f}.problem-card-statuses{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}.problem-card-solved{display:inline-flex;align-items:center;padding:4px 8px;border-radius:999px;font-size:12px;font-weight:600;background:#4caf5029;color:#93df9f}.problem-card-meta{display:flex;flex-wrap:wrap;gap:8px;color:#8ea5cc;font-size:12px}.problem-card-meta span{display:inline-flex;align-items:center;padding:4px 8px;border-radius:999px;background:#0f3460a6}.contact-page{flex:1;overflow-y:auto;width:100%;background:radial-gradient(circle at top right,rgba(126,180,255,.12),transparent 30%),linear-gradient(180deg,#0b1222,#0a0f1e 45%,#08101f)}.contact-page-header{max-width:960px;margin:0 auto;padding:32px 32px 12px}.contact-page-eyebrow{margin:0 0 10px;color:#8dc0ff;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.contact-page-header h2{margin:0;color:#fff;font-size:30px}.contact-page-header p{max-width:760px;margin:12px 0 0;color:#c8d4ea;font-size:15px;line-height:1.8}.contact-page-grid{max-width:960px;margin:0 auto;padding:20px 32px 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.contact-page-card,.contact-page-note{border-radius:22px;border:1px solid rgba(95,134,195,.24);background:#0b1427d6;box-shadow:0 24px 40px #040a162e}.contact-page-card{padding:22px}.contact-page-card h3{margin:0;color:#fff5e5;font-size:20px}.contact-page-card p{margin:12px 0 0;color:#c8d4ea;line-height:1.7;font-size:14px}.contact-page-chip{display:inline-flex;align-items:center;gap:6px;margin-bottom:14px;padding:5px 10px;border-radius:999px;background:#182b52db;color:#8dc0ff;font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.contact-page-link{display:inline-flex;align-items:center;justify-content:center;margin-top:18px;padding:11px 16px;background:#8dc0ff;color:#091224;border-radius:10px;text-decoration:none;font-size:14px;font-weight:800;transition:transform .2s ease,background .2s ease}.contact-page-link:hover{background:#b6d8ff;transform:translateY(-1px)}.contact-page-note{max-width:960px;margin:18px auto 32px;padding:22px 32px 28px}.contact-page-note h3{margin:0;color:#fff;font-size:18px}.contact-page-note ul{margin:14px 0 0;padding-left:20px;color:#dce5f6;line-height:1.8}.contact-page-note li+li{margin-top:6px}.glossary-page{flex:1;overflow-y:auto;min-height:0;background:radial-gradient(circle at top left,rgba(52,92,173,.18),transparent 32%),linear-gradient(180deg,#08111f,#0c172a)}.glossary-page-container{max-width:1120px;margin:0 auto;padding:28px 24px 40px}.glossary-page-hero,.glossary-toolbar,.glossary-section,.glossary-empty{border:1px solid rgba(132,164,219,.18);border-radius:20px;background:#0a1425e0;box-shadow:0 24px 40px #0309143d}.glossary-page-hero{padding:30px 32px}.glossary-page-eyebrow{margin:0 0 8px;color:#91b4ff;font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.glossary-page-hero h2{margin:0;color:#fff;font-size:clamp(28px,4vw,40px)}.glossary-page-summary{margin:18px 0 0;max-width:760px;color:#d7e3f7;line-height:1.8}.glossary-page-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.glossary-page-primary,.glossary-page-secondary{border-radius:999px;padding:11px 18px;font-size:14px;font-weight:700;cursor:pointer;transition:transform .2s ease,background .2s ease,color .2s ease}.glossary-page-primary{border:none;background:linear-gradient(135deg,#78a7ff,#4f74d8);color:#08111f}.glossary-page-secondary{border:1px solid rgba(141,192,255,.32);background:#101f38e0;color:#dce8ff}.glossary-page-primary:hover,.glossary-page-secondary:hover,.glossary-index-chip:hover{transform:translateY(-1px)}.glossary-toolbar{display:grid;grid-template-columns:auto minmax(240px,1fr) auto;gap:16px;align-items:center;margin-top:20px;padding:18px 22px}.glossary-search-label{color:#f6f9ff;font-weight:700}.glossary-search-input{width:100%;border:1px solid rgba(128,160,214,.32);border-radius:12px;background:#07101eeb;color:#f7fbff;padding:11px 14px;font-size:14px}.glossary-search-input::placeholder{color:#7f93b5}.glossary-search-meta{margin:0;color:#a5b8d8;font-size:13px}.glossary-index{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 20px}.glossary-index-chip{border:1px solid rgba(141,192,255,.26);border-radius:999px;background:#0e1d35d9;color:#dbe7ff;padding:8px 14px;font-size:13px;font-weight:700;cursor:pointer}.glossary-section{margin-top:20px;padding:24px}.glossary-section-header{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:18px}.glossary-section-header h3{margin:0;color:#fff;font-size:24px}.glossary-section-header p{margin:8px 0 0;color:#b6c7e2;line-height:1.7}.glossary-section-count{flex-shrink:0;padding:7px 10px;border-radius:999px;background:#4268ad3d;color:#cfe0ff;font-size:12px;font-weight:700}.glossary-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}.glossary-card{display:flex;flex-direction:column;gap:12px;padding:18px;border-radius:18px;border:1px solid rgba(122,155,208,.16);background:linear-gradient(180deg,#12223cf0,#0a1322f0)}.glossary-card-header h4{margin:0;color:#fff;font-size:20px}.glossary-card-aliases{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.glossary-card-alias{padding:4px 8px;border-radius:999px;background:#7a9fdf29;color:#c9dcff;font-size:12px;font-weight:700}.glossary-card-summary,.glossary-card-detail{margin:0;line-height:1.75}.glossary-card-summary{color:#eff5ff;font-weight:700}.glossary-card-detail{color:#b6c7e2}.glossary-card-example{margin-top:auto}.glossary-card-example>span{display:inline-block;margin-bottom:8px;color:#8fb0ed;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.glossary-card-example pre{margin:0;overflow-x:auto;border-radius:12px;background:#07111f;border:1px solid rgba(115,146,196,.18);padding:12px 14px;color:#f7fbff}.glossary-empty{margin-top:20px;padding:28px 24px;color:#d5e0f5}.glossary-empty h3{margin:0;color:#fff}.glossary-empty p{margin:10px 0 0;line-height:1.7}@media(max-width:640px){.glossary-page-container{padding:20px 16px 32px}.glossary-page-hero,.glossary-toolbar,.glossary-section,.glossary-empty{border-radius:16px}.glossary-page-hero,.glossary-section,.glossary-empty{padding:20px}.glossary-toolbar{grid-template-columns:1fr}.glossary-page-actions{flex-direction:column}.glossary-page-primary,.glossary-page-secondary{width:100%}.glossary-section-header{flex-direction:column}.glossary-card-grid{grid-template-columns:1fr}.practice-recommendation{flex-direction:column;align-items:stretch}.practice-recommendation .problem-card-button{width:100%;align-self:stretch}}:root{font-family:Segoe UI,system-ui,-apple-system,sans-serif;color:#e0e0e0;background-color:#1a1a2e}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;min-height:100vh}#root{min-height:100vh}code,pre{font-family:Consolas,Monaco,Courier New,monospace}