:root{--bg:#0c0f14;--bg-raised:#12161e;--bg-card:#151a24;--bg-inset:#0a0d12;--border:#232a37;--border-soft:#1b212c;--text:#e8e6e1;--text-dim:#9aa3b2;--text-faint:#6b7484;--accent:#f0b545;--accent-soft:#f0b54524;--accent-strong:#ffc95e;--green:#4ade80;--green-soft:#4ade801f;--red:#f87171;--red-soft:#f871711a;--blue:#7dd3fc;--blue-soft:#7dd3fc1f;--purple:#c4b5fd;--purple-soft:#c4b5fd1f;--teal:#5eead4;--teal-soft:#5eead41f;--orange:#fdba74;--orange-soft:#fdba741f;--rose:#f9a8d4;--rose-soft:#f9a8d41f;--radius:14px;--radius-sm:9px;--font-sans:"Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.6}#root{flex-direction:column;min-height:100vh;display:flex}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit}code,pre,kbd{font-family:var(--font-mono)}::selection{background:#f0b5454d}.app-header{z-index:20;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-soft);background:#0c0f14d9;justify-content:space-between;align-items:center;gap:16px;padding:14px 28px;display:flex;position:sticky;top:0}.brand{letter-spacing:-.01em;align-items:center;gap:11px;font-size:16px;font-weight:700;display:flex}.brand-mark{color:#1a1206;background:linear-gradient(135deg,#f0b545,#d98324);border-radius:10px;place-items:center;width:34px;height:34px;font-size:17px;display:grid;box-shadow:0 2px 12px #f0b54540}.brand-mark img{object-fit:contain;width:19px;height:19px}.brand-sub{color:var(--text-faint);font-size:13px;font-weight:500}.header-right{align-items:center;gap:12px;display:flex}.lang-toggle{background:var(--bg-raised);border:1px solid var(--border);border-radius:999px;align-items:center;gap:2px;padding:3px;display:flex}.lang-toggle button{color:var(--text-dim);letter-spacing:.06em;cursor:pointer;background:0 0;border:none;border-radius:999px;padding:4px 11px;font-size:11px;font-weight:700;transition:background .15s,color .15s}.lang-toggle button:hover{color:var(--text)}.lang-toggle button.active{background:var(--accent-soft);color:var(--accent-strong)}.xp-pill{background:var(--accent-soft);color:var(--accent-strong);font-variant-numeric:tabular-nums;border:1px solid #f0b54540;border-radius:999px;align-items:center;gap:8px;padding:7px 16px;font-size:14px;font-weight:700;transition:transform .25s;display:flex}.xp-pill.bump{transform:scale(1.12)}.xp-pill .xp-label{letter-spacing:.08em;color:#f0b545b3;font-size:11px;font-weight:600}.app-main{flex-direction:column;flex:1;min-width:0;display:flex}.page{width:100%;max-width:1120px;margin:0 auto;padding:32px 28px 64px}.page-fade{animation:.35s both fadeUp}@keyframes fadeUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.loading-state,.error-state{text-align:center;color:var(--text-dim);flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:96px 24px;display:flex}.error-state h2{color:var(--text);margin:0;font-size:20px}.error-state code{background:var(--bg-inset);border:1px solid var(--border);color:var(--accent-strong);border-radius:6px;padding:3px 9px;font-size:13px}.error-state .error-icon{font-size:40px}.spinner{border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:26px;height:26px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-raised);color:var(--text);align-items:center;gap:7px;padding:8px 16px;font-size:13.5px;font-weight:600;transition:background .15s,border-color .15s,transform .1s;display:inline-flex}.btn:hover:not(:disabled){background:#1a2029;border-color:#303948}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#241804}.btn-primary:hover:not(:disabled){background:var(--accent-strong);border-color:var(--accent-strong)}.btn-ghost{color:var(--text-dim);background:0 0;border-color:#0000}.btn-ghost:hover:not(:disabled){background:var(--bg-raised);color:var(--text);border-color:#0000}.btn-sm{padding:5px 12px;font-size:12.5px}.xp-bar{background:var(--bg-inset);border:1px solid var(--border-soft);border-radius:999px;height:7px;overflow:hidden}.xp-bar-fill{background:linear-gradient(90deg,#d98324,#f0b545);border-radius:999px;height:100%;transition:width .6s cubic-bezier(.22,1,.36,1)}.xp-bar-fill.complete{background:linear-gradient(90deg,#34c86e,#4ade80)}.roadmap-hero{margin-bottom:36px}.roadmap-hero h1{letter-spacing:-.02em;margin:0 0 6px;font-size:28px;font-weight:800}.roadmap-hero p{color:var(--text-dim);max-width:560px;margin:0}.tracks{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));align-items:start;gap:28px;display:grid}.track-foundations .track-icon,.track-foundations-icon{background:#9ece8a1f}.role-group{margin-top:40px}.role-header{align-items:center;gap:12px;margin-bottom:20px;display:flex}.role-header .track-icon{border-radius:11px;width:38px;height:38px}.role-header h2{letter-spacing:-.015em;margin:0;font-size:21px;font-weight:800}.role-tracks{grid-template-columns:1fr 1fr}@media (width<=860px){.tracks,.role-tracks{grid-template-columns:1fr}}.track-header{border-bottom:1px solid var(--border-soft);align-items:center;gap:10px;margin-bottom:16px;padding-bottom:12px;display:flex}.track-icon{border-radius:9px;place-items:center;width:32px;height:32px;font-size:16px;display:grid}.track-analyst .track-icon{background:var(--blue-soft)}.track-engineer .track-icon{background:var(--purple-soft)}.track-sql-analyst .track-icon{background:var(--teal-soft)}.track-sql-engineer .track-icon{background:var(--orange-soft)}.track-scientist .track-icon,.track-ds-python .track-icon{background:var(--rose-soft)}.track-header h2{letter-spacing:-.01em;margin:0;font-size:17px;font-weight:700}.track-header .track-count{color:var(--text-faint);margin-left:auto;font-size:12.5px;font-weight:500}.track-courses{flex-direction:column;gap:16px;display:flex}.course-card{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius);padding:20px 22px;transition:border-color .2s,transform .2s,box-shadow .2s;display:block}.course-card:hover{border-color:#343e50;transform:translateY(-2px);box-shadow:0 8px 28px #00000059}.course-card-top{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.course-card h3{letter-spacing:-.01em;margin:0 0 4px;font-size:16px;font-weight:700}.course-card .course-desc{color:var(--text-dim);margin:0 0 14px;font-size:13.5px;line-height:1.55}.course-done{background:var(--green-soft);width:26px;height:26px;color:var(--green);border:1px solid #4ade804d;border-radius:50%;flex-shrink:0;place-items:center;font-size:13px;display:grid}.course-chapters{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.course-chapter-row{color:var(--text-dim);align-items:center;gap:9px;font-size:13px;display:flex}.chapter-dot{background:var(--border);border-radius:50%;flex-shrink:0;width:7px;height:7px}.chapter-dot.done{background:var(--green)}.chapter-dot.partial{background:var(--accent)}.course-chapter-row .chapter-progress{color:var(--text-faint);font-variant-numeric:tabular-nums;margin-left:auto;font-size:12px}.course-xp-row{color:var(--text-dim);justify-content:space-between;align-items:center;margin-bottom:8px;font-size:12.5px;font-weight:600;display:flex}.course-xp-row .xp-earned{color:var(--accent-strong);font-variant-numeric:tabular-nums}.crumbs{color:var(--text-faint);align-items:center;gap:8px;margin-bottom:20px;font-size:13px;display:flex}.crumbs a{color:var(--text-dim);transition:color .15s}.crumbs a:hover{color:var(--accent-strong)}.course-head{margin-bottom:32px}.course-head h1{letter-spacing:-.02em;margin:0 0 6px;font-size:26px;font-weight:800}.course-head p{color:var(--text-dim);max-width:620px;margin:0 0 18px}.course-head-meta{align-items:center;gap:14px;max-width:480px;display:flex}.course-head-meta .xp-bar{flex:1}.course-head-meta span{color:var(--accent-strong);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:13px;font-weight:600}.chapter-section{margin-bottom:30px}.chapter-section-head{align-items:baseline;gap:12px;margin-bottom:12px;display:flex}.chapter-section-head h2{letter-spacing:-.01em;margin:0;font-size:17px;font-weight:700}.chapter-section-head .chapter-xp{color:var(--text-faint);font-size:12.5px;font-weight:600}.lesson-list{flex-direction:column;gap:8px;display:flex}.lesson-row{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius-sm);align-items:center;gap:14px;padding:13px 18px;transition:border-color .15s,background .15s;display:flex}.lesson-row:hover{background:#181e29;border-color:#343e50}.lesson-status{border:1.5px solid var(--border);color:#0000;border-radius:50%;flex-shrink:0;place-items:center;width:22px;height:22px;font-size:11px;transition:all .2s;display:grid}.lesson-status.done{background:var(--green-soft);color:var(--green);border-color:#4ade8066}.lesson-row .lesson-title{font-size:14px;font-weight:600}.lesson-row .lesson-xp{color:var(--text-faint);font-variant-numeric:tabular-nums;white-space:nowrap;margin-left:auto;font-size:12.5px;font-weight:600}.lesson-row.completed .lesson-xp{color:var(--accent-strong)}.type-badge{letter-spacing:.03em;text-transform:uppercase;border-radius:999px;flex-shrink:0;padding:2px 9px;font-size:11px;font-weight:600}.type-badge.exercise{background:var(--blue-soft);color:var(--blue)}.type-badge.quiz{background:var(--purple-soft);color:var(--purple)}.type-badge.project{background:var(--accent-soft);color:var(--accent-strong)}.lesson-page{flex-direction:column;flex:1;min-height:0;display:flex}.lesson-topbar{border-bottom:1px solid var(--border-soft);background:var(--bg-raised);align-items:center;gap:14px;padding:12px 24px;display:flex}.lesson-topbar .lesson-topbar-title{align-items:center;gap:10px;min-width:0;font-size:15px;font-weight:700;display:flex}.lesson-topbar .lesson-topbar-title span.title-text{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.lesson-topbar .lesson-topbar-crumb{color:var(--text-faint);white-space:nowrap;font-size:12.5px}@media (width<=980px){.lesson-topbar .lesson-topbar-crumb{text-overflow:ellipsis;min-width:0;overflow:hidden}}.lesson-topbar .lesson-nav{align-items:center;gap:8px;margin-left:auto;display:flex}.lesson-panels{flex:1;grid-template-columns:minmax(360px,46%) 1fr;min-height:0;display:grid}@media (width<=980px){.lesson-panels{grid-template-columns:1fr}}.panel-left{border-right:1px solid var(--border-soft);padding:26px 28px 48px;overflow-y:auto}.panel-right{background:var(--bg-raised);padding:26px 28px 48px;overflow-y:auto}.panel-section-label{letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint);align-items:center;gap:8px;margin:0 0 12px;font-size:11.5px;font-weight:700;display:flex}.lab-block{border-top:1px solid var(--border-soft);margin-top:28px;padding-top:22px}.lab-editor{border:1px solid var(--border);border-radius:var(--radius-sm);margin:12px 0 10px;overflow:hidden}.lab-actions{align-items:center;gap:10px;display:flex}.exercise-editor{border:1px solid var(--border);border-radius:var(--radius-sm);margin:14px 0;transition:border-color .2s;overflow:hidden}.exercise-editor:focus-within,.lab-editor:focus-within{border-color:#3b475c}.exercise-actions{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:14px;display:flex}.exercise-actions .spacer{flex:1}.console{background:var(--bg-inset);border:1px solid var(--border-soft);border-radius:var(--radius-sm);font-family:var(--font-mono);white-space:pre-wrap;word-break:break-word;max-height:260px;padding:12px 14px;font-size:12.5px;line-height:1.55;overflow-y:auto}.console .console-empty{color:var(--text-faint);font-style:italic}.console .stderr{color:var(--red)}.console .console-meta{color:var(--text-faint);margin-top:6px;font-size:11.5px}.sql-setup{border:1px solid var(--border-soft);border-radius:var(--radius-sm);background:var(--bg-inset);margin:0 0 10px;font-size:12.5px}.sql-setup summary{cursor:pointer;color:var(--text-dim);align-items:center;gap:6px;padding:8px 12px;font-weight:600;list-style:none;display:flex}.sql-setup summary::-webkit-details-marker{display:none}.sql-setup summary:before{content:"▸";color:var(--text-faint)}.sql-setup[open] summary:before{content:"▾"}.sql-setup summary .icon{color:var(--teal)}.sql-setup pre{max-height:260px;font-family:var(--font-mono);color:var(--text-dim);margin:0;padding:2px 12px 12px;font-size:12px;line-height:1.55;overflow:auto}.sql-output{flex-direction:column;gap:12px;display:flex}.sql-table-wrap{overflow-x:auto}.sql-table{border-collapse:collapse;font-family:var(--font-mono);font-size:12.5px}.sql-table th{text-align:left;color:var(--accent);border-bottom:1px solid var(--border);white-space:nowrap;padding:4px 12px 6px 0;font-weight:600}.sql-table td{border-bottom:1px solid var(--border-soft);white-space:nowrap;color:var(--text);padding:4px 12px 4px 0}.sql-table td.num{text-align:right;font-variant-numeric:tabular-nums}.sql-table td.null{color:var(--text-faint);font-style:italic}.sql-meta{color:var(--text-faint);margin-top:6px;font-size:11.5px}.sql-ok{font-family:var(--font-mono);color:var(--green);align-items:center;gap:6px;font-size:12.5px;display:flex}.feedback{border-radius:var(--radius-sm);align-items:flex-start;gap:12px;margin:14px 0;padding:14px 16px;font-size:13.5px;animation:.3s both fadeUp;display:flex}.feedback.pass{background:var(--green-soft);color:var(--green);border:1px solid #4ade804d}.feedback.fail{background:var(--red-soft);color:var(--red);border:1px solid #f8717140}.feedback .feedback-body{flex:1;min-width:0}.feedback .feedback-title{margin-bottom:2px;font-weight:700}.feedback .feedback-msg{color:var(--text-dim);font-family:var(--font-mono);white-space:pre-wrap;word-break:break-word;font-size:12.5px}.celebration{border-radius:var(--radius);text-align:center;background:linear-gradient(135deg,#f0b5451f,#4ade801a);border:1px solid #f0b5454d;margin:14px 0;padding:22px 20px;animation:.45s cubic-bezier(.22,1.4,.36,1) both celebrate}@keyframes celebrate{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.celebration .celebration-emoji{margin-bottom:8px;font-size:34px;line-height:1}.celebration h3{color:var(--accent-strong);margin:0 0 4px;font-size:17px;font-weight:800}.celebration p{color:var(--text-dim);margin:0 0 14px;font-size:13.5px}.hint-box,.solution-box{border-radius:var(--radius-sm);margin:14px 0;padding:14px 16px;font-size:13.5px;animation:.25s both fadeUp}.hint-box{background:var(--blue-soft);border:1px solid #7dd3fc40}.hint-box .hint-label{color:var(--blue);text-transform:uppercase;letter-spacing:.08em;margin-bottom:3px;font-size:12px;font-weight:700}.solution-box{background:var(--bg-inset);border:1px solid var(--border)}.solution-box .solution-label{color:var(--accent-strong);text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px;font-size:12px;font-weight:700}.solution-box pre{white-space:pre-wrap;word-break:break-word;margin:0;font-size:12.5px;line-height:1.6}.md{color:var(--text);font-size:14.5px;line-height:1.7}.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}.md h1,.md h2,.md h3,.md h4{letter-spacing:-.01em;margin:1.4em 0 .5em;line-height:1.3}.md h1{font-size:20px}.md h2{font-size:17px}.md h3{font-size:15px}.md p{margin:.7em 0}.md ul,.md ol{margin:.7em 0;padding-left:1.4em}.md li{margin:.25em 0}.md a{color:var(--blue);text-underline-offset:2px;text-decoration:underline}.md blockquote{border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-dim);margin:.8em 0;padding:2px 16px}.md code{background:var(--bg-inset);border:1px solid var(--border-soft);color:#fbd38d;border-radius:5px;padding:1.5px 6px;font-size:.87em}.md pre{background:var(--bg-inset);border:1px solid var(--border-soft);border-radius:var(--radius-sm);margin:.9em 0;padding:14px 16px;line-height:1.6;overflow-x:auto}.md pre code{color:var(--text);background:0 0;border:none;padding:0;font-size:12.5px}.md table{border-collapse:collapse;width:100%;margin:.9em 0;font-size:13.5px}.md th,.md td{border:1px solid var(--border);text-align:left;padding:6px 12px}.md th{background:var(--bg-inset);font-weight:600}.md table{border-collapse:collapse;font-family:var(--font-mono);margin:8px 0 14px;font-size:12.5px}.md th{text-align:left;color:var(--accent);border-bottom:1px solid var(--border);white-space:nowrap;padding:4px 12px 6px 0;font-weight:600}.md td{border-bottom:1px solid var(--border-soft);white-space:nowrap;padding:4px 12px 4px 0}.hljs-keyword,.hljs-selector-tag{color:#c4b5fd}.hljs-string,.hljs-attr{color:#9ece8a}.hljs-number,.hljs-literal{color:#f0b545}.hljs-comment{color:#5c6673;font-style:italic}.hljs-function,.hljs-title,.hljs-built_in,.hljs-type{color:#7dd3fc}.hljs-params{color:var(--text)}.hljs-meta,.hljs-operator,.hljs-punctuation{color:#9aa3b2}.cm-editor{font-size:13px}.cm-editor.cm-focused{outline:none}.results-block{text-align:left;background:var(--bg,#0b0e14);border:1px solid #f0b54540;border-radius:10px;max-width:560px;margin:14px auto 18px;padding:12px 16px;overflow-x:auto}.results-label{letter-spacing:.08em;text-transform:uppercase;color:var(--accent-strong);margin-bottom:8px;font-size:.72rem;font-weight:600}.results-block pre{white-space:pre;margin:0;font-family:JetBrains Mono,monospace;font-size:.85rem;line-height:1.6}.app-body{flex:1;align-items:stretch;min-height:0;display:flex}.app-sidebar{border-right:1px solid var(--border-soft);background:#0c0f1499;flex-direction:column;flex:none;width:248px;height:calc(100vh - 61px);padding:16px 10px 12px;transition:width .2s;display:flex;position:sticky;top:61px;overflow-y:auto}.app-sidebar.collapsed{width:62px}.app-sidebar.collapsed .snav-label,.app-sidebar.collapsed .snav-meta,.app-sidebar.collapsed .snav-section,.app-sidebar.collapsed .snav-role,.app-sidebar.collapsed .snav-body{display:none}.snav{flex-direction:column;gap:2px;display:flex}.snav-section{letter-spacing:.14em;text-transform:uppercase;color:var(--text-faint);margin:14px 12px 6px;font-size:10.5px;font-weight:600}.snav-role{letter-spacing:.12em;text-transform:uppercase;align-items:center;gap:6px;margin:12px 12px 4px;font-size:10.5px;font-weight:700;display:flex}.snav-item{color:inherit;border-radius:10px;align-items:center;gap:10px;padding:9px 12px;font-size:13.5px;font-weight:600;transition:background .15s,color .15s;display:flex}.snav-item:hover{background:#ffffff0a}.snav-item.active{background:var(--accent-soft);color:var(--accent-strong)}.snav-icon{text-align:center;flex:none;width:20px;font-size:15px}.snav-body{flex-direction:column;gap:2px;min-width:0;display:flex}.snav-meta{color:var(--text-faint);font-size:11px;font-weight:500}.snav-courses{border-left:1px solid var(--border-soft);flex-direction:column;gap:1px;margin:4px 0 8px 21px;padding-left:10px;display:flex}.snav-course{color:var(--text-muted,#9aa4b2);border-radius:8px;align-items:baseline;gap:7px;padding:5px 8px;font-size:12.5px;transition:background .15s,color .15s;display:flex}.snav-course:hover{color:inherit;background:#ffffff0a}.snav-course.active{color:var(--accent-strong);background:#f0b54514}.snav-course-mark{color:var(--text-faint);flex:none;font-size:11px}.snav-course-mark.done{color:#34d399}.snav-course-mark.started{color:var(--accent-strong)}.snav-course-title{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.snav-collapse{border:1px solid var(--border);background:var(--bg-raised);font:inherit;color:var(--text-dim);cursor:pointer;border-radius:10px;align-items:center;gap:10px;margin-top:auto;padding:9px 12px;font-size:12.5px;font-weight:600;transition:background .15s,border-color .15s,color .15s;display:flex}.snav-collapse:hover{color:var(--text);background:#1a2029;border-color:#303948}.track-courses-grid{columns:2;column-gap:16px}.track-courses-grid .course-card{break-inside:avoid;margin-bottom:16px}@media (width<=1100px){.track-courses-grid{columns:1}}@media (width<=700px){.app-sidebar{display:none}}.icon{vertical-align:-.14em;flex:none;display:inline-block}.xp-pill .icon,.xp-earned .icon,.lesson-xp .icon,.snav-meta .icon{color:var(--accent)}.auth-user{align-items:center;gap:4px;min-width:0;display:flex}.auth-email{text-overflow:ellipsis;white-space:nowrap;max-width:180px;color:var(--text-dim);align-items:center;gap:6px;font-size:12.5px;font-weight:600;display:inline-flex;overflow:hidden}.auth-email .icon{color:var(--accent)}@media (width<=700px){.auth-email{max-width:96px}.auth-signout-label{display:none}}.modal-overlay{z-index:50;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#080a0eb8;justify-content:center;align-items:center;padding:24px;animation:.2s both fadeUp;display:flex;position:fixed;inset:0}.auth-modal{border-radius:var(--radius);background:var(--bg-card);border:1px solid var(--border);width:100%;max-width:380px;padding:28px;position:relative;box-shadow:0 24px 64px #00000080}.auth-close{border-radius:var(--radius-sm);width:30px;height:30px;color:var(--text-faint);background:0 0;border:none;place-items:center;transition:background .15s,color .15s;display:grid;position:absolute;top:12px;right:12px}.auth-close:hover{background:var(--bg-raised);color:var(--text)}.auth-tabs{background:var(--bg-inset);border:1px solid var(--border);border-radius:999px;gap:2px;margin-bottom:20px;padding:3px;display:flex}.auth-tabs button{color:var(--text-dim);background:0 0;border:none;border-radius:999px;flex:1;padding:7px 12px;font-size:12.5px;font-weight:700;transition:background .15s,color .15s}.auth-tabs button:hover{color:var(--text)}.auth-tabs button.active{background:var(--accent-soft);color:var(--accent-strong)}.auth-form{flex-direction:column;gap:14px;display:flex}.auth-field{flex-direction:column;gap:5px;display:flex}.auth-field span{letter-spacing:.03em;color:var(--text-dim);font-size:12px;font-weight:600}.auth-field input{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-inset);color:var(--text);outline:none;padding:9px 12px;font-family:inherit;font-size:14px;transition:border-color .15s}.auth-field input:focus{border-color:var(--accent)}.auth-error,.auth-notice{border-radius:var(--radius-sm);padding:9px 12px;font-size:13px;line-height:1.5}.auth-error{background:var(--red-soft);color:var(--red);border:1px solid #f871714d}.auth-notice{background:var(--green-soft);color:var(--green);border:1px solid #4ade804d}.auth-submit{justify-content:center;margin-top:2px}.auth-hint{color:var(--text-dim);margin:0;font-size:13px;line-height:1.5}.auth-link{color:var(--accent);font:inherit;cursor:pointer;background:0 0;border:0;align-self:flex-start;padding:0;font-size:12.5px}.auth-link:hover{text-decoration:underline}.auth-note{color:var(--text-faint);text-align:center;margin:16px 0 0;font-size:12.5px}.level-chip,.streak-chip{font-variant-numeric:tabular-nums;white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:6px 12px;font-size:12.5px;font-weight:700;display:flex}.level-chip{background:var(--purple-soft);color:var(--purple);border:1px solid #c4b5fd47}.level-ring{flex:none;display:block;transform:rotate(-90deg)}.streak-chip{color:#fb923c;background:#fb923c1f;border:1px solid #fb923c4d}.streak-chip.dim{background:var(--bg-raised);border-color:var(--border);color:var(--text-faint)}@media (width<=700px){.level-chip,.streak-chip{display:none}}.ach-cards{grid-template-columns:1fr 1fr;gap:16px;margin-bottom:36px;display:grid}@media (width<=700px){.ach-cards{grid-template-columns:1fr}}.ach-card{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius);padding:20px 22px}.ach-card-label{letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint);align-items:center;gap:8px;margin:0 0 10px;font-size:11.5px;font-weight:700;display:flex}.ach-card-label .icon{color:var(--accent)}.ach-big{letter-spacing:-.02em;color:var(--text);font-variant-numeric:tabular-nums;font-size:42px;font-weight:800;line-height:1.1}.ach-level-bar{margin:12px 0 10px}.ach-card-meta{color:var(--text-dim);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;font-size:12.5px;display:flex}.ach-card-meta .ach-card-strong{color:var(--accent-strong);font-variant-numeric:tabular-nums;font-weight:600}.ach-streak-row{align-items:center;gap:12px;margin-bottom:12px;display:flex}.ach-streak-row .ach-streak-flame{color:#fb923c}.ach-streak-row.dim .ach-streak-flame{color:var(--text-faint)}.ach-streak-row .ach-streak-unit{color:var(--text-dim);font-size:13px;font-weight:600}.ach-badges-head{border-bottom:1px solid var(--border-soft);align-items:baseline;gap:12px;margin-bottom:14px;padding-bottom:12px;display:flex}.ach-badges-head h2{letter-spacing:-.01em;margin:0;font-size:17px;font-weight:700}.ach-badges-head .ach-badges-count{color:var(--text-faint);font-variant-numeric:tabular-nums;margin-left:auto;font-size:12.5px;font-weight:600}.badge-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;display:grid}.badge-card{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius);align-items:flex-start;gap:12px;padding:16px;transition:border-color .2s;display:flex;position:relative}.badge-card.unlocked{border-color:#f0b54547}.badge-icon-chip{background:var(--accent-soft);width:40px;height:40px;color:var(--accent-strong);border:1px solid #f0b5454d;border-radius:12px;flex:none;place-items:center;display:grid}.badge-card.locked .badge-icon-chip{background:var(--bg-raised);border-color:var(--border);color:var(--text-faint)}.badge-body{flex:1;min-width:0}.badge-name{letter-spacing:-.01em;font-size:13.5px;font-weight:700}.badge-card.locked .badge-name{color:var(--text-dim)}.badge-desc{color:var(--text-dim);margin-top:2px;font-size:12.5px;line-height:1.5}.badge-card.locked .badge-desc{color:var(--text-faint)}.badge-progress{align-items:center;gap:10px;margin-top:10px;display:flex}.badge-progress-bar{flex:1;height:5px}.badge-progress-count{color:var(--text-faint);font-variant-numeric:tabular-nums;flex:none;font-size:11.5px;font-weight:600}.badge-check{background:var(--green-soft);width:20px;height:20px;color:var(--green);border:1px solid #4ade804d;border-radius:50%;place-items:center;display:grid;position:absolute;top:10px;right:10px}.unlock-badges{margin:0 0 14px}.unlock-badges-label{letter-spacing:.1em;text-transform:uppercase;color:var(--accent-strong);margin-bottom:8px;font-size:11.5px;font-weight:700}.unlock-badges-row{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;display:flex}.unlock-badge-chip{background:var(--accent-soft);color:var(--accent-strong);border:1px solid #f0b54559;border-radius:999px;align-items:center;gap:6px;padding:5px 12px;font-size:12.5px;font-weight:700;animation:.45s cubic-bezier(.22,1.4,.36,1) both celebrate;display:inline-flex}.mnav-trigger{display:none}.mnav-bars{width:18px;height:12px;display:block;position:relative}.mnav-bars span{background:currentColor;border-radius:2px;width:100%;height:2px;position:absolute;left:0}.mnav-bars span:first-child{top:0}.mnav-bars span:nth-child(2){top:5px}.mnav-bars span:nth-child(3){top:10px}.mnav-overlay{z-index:40;display:flex;position:fixed;inset:0}.mnav-backdrop{-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);cursor:default;background:#080a0eb8;border:none;width:100%;height:100%;padding:0;animation:.18s both mnavFadeIn;position:absolute;inset:0}.mnav-drawer{background:var(--bg-raised);border-right:1px solid var(--border);width:min(300px,86vw);height:100%;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom);padding-left:env(safe-area-inset-left);flex-direction:column;animation:.22s cubic-bezier(.2,.7,.3,1) both mnavSlideIn;display:flex;position:relative;box-shadow:0 0 44px #00000080}.mnav-head{border-bottom:1px solid var(--border-soft);flex:none;justify-content:space-between;align-items:center;gap:8px;padding:8px 8px 8px 16px;display:flex}.mnav-title{letter-spacing:.14em;text-transform:uppercase;color:var(--text-faint);font-size:10.5px;font-weight:600}.mnav-close{border:1px solid var(--border);background:var(--bg-card);width:44px;height:44px;color:var(--text-dim);border-radius:10px;flex:none;place-items:center;padding:0;transition:background .15s,color .15s;display:grid}.mnav-close:hover,.mnav-close:focus-visible{color:var(--text);background:#1a2029}.mnav-body{overscroll-behavior:contain;-webkit-overflow-scrolling:touch;flex:1;padding:10px 10px 28px;overflow-y:auto}.mnav-drawer .snav-collapse{display:none}.mnav-body .snav-item{min-height:44px;padding:10px 12px;font-size:14.5px}.mnav-body .snav-meta{font-size:11.5px}.mnav-body .snav-course{align-items:center;min-height:44px;padding:8px 10px;font-size:13.5px}.mnav-body .snav-section{margin-top:18px}@keyframes mnavFadeIn{0%{opacity:0}to{opacity:1}}@keyframes mnavSlideIn{0%{transform:translate(-100%)}to{transform:none}}@media (prefers-reduced-motion:reduce){.mnav-backdrop,.mnav-drawer{animation:none}}@media (width<=700px){.mnav-trigger{width:44px;height:44px;color:var(--text);background:0 0;border:none;border-radius:10px;flex:none;place-items:center;margin-left:-10px;padding:0;display:inline-grid}.mnav-trigger:active{background:#ffffff0f}.app-header{padding:6px 14px;padding-left:max(14px, env(safe-area-inset-left));padding-right:max(14px, env(safe-area-inset-right));padding-top:max(6px, env(safe-area-inset-top));justify-content:flex-start;gap:8px}.brand{gap:9px;min-width:0;min-height:44px;font-size:14.5px}.brand>span:last-child{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.brand-mark{border-radius:9px;flex:none;width:30px;height:30px}.brand-mark img{width:17px;height:17px}.header-right{flex:0 auto;gap:8px;min-width:0;margin-left:auto}.lang-toggle{flex:none}.lang-toggle button{padding:6px 11px;position:relative}.lang-toggle button:after{content:"";position:absolute;inset:-9px 0}.lang-toggle button:first-child:after{left:-6px}.lang-toggle button:last-child:after{right:-7px}.header-right .btn-sm{text-align:center;text-overflow:ellipsis;white-space:nowrap;flex:0 auto;min-width:44px;min-height:44px;padding:8px 10px;line-height:26px;display:inline-block;overflow:hidden}.auth-user{gap:2px}.auth-email{max-width:84px}.xp-pill{flex:none;gap:6px;padding:7px 13px;font-size:13.5px}.app-main{min-width:0;padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right);padding-bottom:env(safe-area-inset-bottom)}}@media (width<=500px){.brand>span:last-child{display:none}.brand{flex:none;position:relative}.brand:after{content:"";position:absolute;inset:0 -10px 0 -4px}}@media (width<=430px){.auth-email{display:none}.xp-pill{padding:7px 11px}.xp-pill .xp-label{display:none}}@media (width<=380px){.app-header,.header-right{gap:6px}}@media (width<=360px){.app-header{padding-left:max(10px, env(safe-area-inset-left));padding-right:max(10px, env(safe-area-inset-right));gap:4px}.header-right{gap:4px}.xp-pill{padding:7px 9px}.auth-signin-label{display:none}}@media (width<=980px){.brand-sub{display:none}}@media (width<=700px){.course-card h3,.course-head h1,.chapter-section-head h2,.lesson-row .lesson-title,.course-chapter-row .chapter-name,.badge-name,.badge-desc{overflow-wrap:anywhere}.lesson-row .lesson-title,.badge-body,.course-chapter-row .chapter-name{min-width:0}.crumbs .crumb-current{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.page{padding:20px 16px 40px}.roadmap-hero{margin-bottom:24px}.roadmap-hero h1{font-size:22px;line-height:1.25}.roadmap-hero h1 .icon{width:20px;height:20px}.roadmap-hero p{font-size:15px}.tracks{gap:22px}.track-header{gap:9px;margin-bottom:12px}.track-header h2{overflow-wrap:anywhere;min-width:0;font-size:16px}.track-header .track-count{white-space:nowrap;flex:none;font-size:12.5px}.track-courses{gap:12px}.course-card{padding:16px}.course-card:hover{box-shadow:none;transform:none}.course-card h3{font-size:15.5px}.course-card .course-desc{margin-bottom:12px;font-size:14px}.course-chapter-row{font-size:13.5px}.course-chapter-row .chapter-progress{flex:none;padding-left:6px;font-size:12.5px}.course-xp-row{flex-wrap:wrap;gap:2px 10px;font-size:12.5px}.crumbs{flex-wrap:wrap;margin-bottom:8px}.crumbs a{align-items:center;min-height:44px;margin:0 -8px;padding:0 8px;display:inline-flex}.course-head{margin-bottom:24px}.course-head h1{font-size:21px;line-height:1.25}.course-head p{margin-bottom:14px;font-size:15px}.course-head-meta{flex-wrap:wrap;gap:8px 12px;max-width:none}.course-head-meta .xp-bar{flex:160px}.chapter-section{margin-bottom:22px}.chapter-section-head{flex-wrap:wrap;gap:4px 10px}.chapter-section-head h2{font-size:16px}.lesson-row{flex-wrap:wrap;gap:6px 10px;min-height:52px;padding:12px 14px}.lesson-row .lesson-title{flex:auto;font-size:14.5px;line-height:1.4}.lesson-row .lesson-xp{font-size:12.5px}.lesson-row:hover{background:var(--bg-card);border-color:var(--border-soft)}.ach-cards{gap:12px;margin-bottom:26px}.ach-card{padding:16px}.ach-big{font-size:34px}.ach-card-meta{font-size:13px}.ach-badges-head{flex-wrap:wrap;gap:4px 10px;margin-bottom:12px}.ach-badges-head h2{font-size:16px}.ach-badges-head .ach-badges-count{font-size:12.5px}.badge-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.badge-card{gap:10px;padding:14px}.badge-icon-chip{border-radius:10px;width:34px;height:34px}.badge-name{font-size:13.5px}.badge-desc{font-size:13px}.badge-check{top:8px;right:8px}.loading-state,.error-state{padding:56px 20px}.error-state h2{font-size:18px}.error-state p{overflow-wrap:anywhere;max-width:34ch;margin:0}.error-state .btn,.loading-state .btn{min-height:44px;padding:10px 18px;font-size:14.5px}.modal-overlay:has(.auth-modal){align-items:flex-end;height:100dvh;padding:0}.auth-modal{overscroll-behavior:contain;max-width:none;max-height:92dvh;padding:50px 18px calc(20px + env(safe-area-inset-bottom,0px));border-bottom:none;border-radius:20px 20px 0 0;animation:.24s cubic-bezier(.22,1,.36,1) both sheetUp;overflow-y:auto;box-shadow:0 -12px 40px #00000080}.auth-modal:before{content:"";background:var(--border);border-radius:999px;width:38px;height:4px;position:absolute;top:9px;left:50%;transform:translate(-50%)}.auth-close{width:44px;height:44px;top:4px;right:4px}.auth-tabs button{min-height:44px;font-size:13.5px}.auth-form{gap:16px}.auth-field span{font-size:12.5px}.auth-field input{min-height:48px;padding:12px 14px;font-size:16px}.auth-error,.auth-notice{overflow-wrap:anywhere;font-size:13.5px}.auth-submit{min-height:48px;font-size:15px}.auth-note{margin-top:14px;font-size:13px}}@keyframes sheetUp{0%{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){.auth-modal{animation:none}}@media (width<=560px){.badge-grid{grid-template-columns:1fr}}@media (width<=360px){.page{padding:18px 12px 36px}.roadmap-hero h1{font-size:20px}.course-head h1{font-size:19px}.course-card{padding:14px}.ach-big{font-size:30px}}.track-menu{display:none}@media (width<=860px){.track-menu{gap:8px;margin:-12px 0 28px;display:grid}.track-menu-group{gap:8px;display:grid}.track-menu-role{letter-spacing:.12em;text-transform:uppercase;align-items:center;gap:6px;margin:10px 4px 0;font-size:11px;font-weight:700;display:flex}.track-menu-item{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-card);min-height:60px;color:var(--text);align-items:center;gap:12px;padding:10px 14px;text-decoration:none;display:flex}.track-menu-item:active{background:var(--bg-raised)}.track-menu-item>.icon:last-child{color:var(--text-faint)}.track-menu-body{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.track-menu-label{font-size:15px;font-weight:700}.track-menu-meta{color:var(--text-dim);font-size:12.5px}.track-menu-meta .icon{color:var(--accent)}}@media (width<=700px){.lesson-topbar{gap:10px;padding:8px 14px}.lesson-topbar .lesson-topbar-title{flex-wrap:wrap;flex:auto;gap:0 8px;font-size:14px}.lesson-topbar .lesson-topbar-crumb{text-overflow:ellipsis;flex:0 0 100%;min-width:0;margin:-14px 0;padding:14px 0;font-size:11px;line-height:1.5;overflow:hidden}.lesson-topbar .lesson-topbar-crumb a{margin:-14px 0;padding:14px 0;display:inline-block}.lesson-topbar .lesson-nav{flex:none;gap:6px}.lesson-topbar .lesson-nav .btn{justify-content:center;min-width:44px;min-height:44px;padding:0 10px}.lesson-tabbar{top:calc(51px + max(6px, env(safe-area-inset-top,0px)));z-index:6;background:var(--bg-raised);border-bottom:1px solid var(--border-soft);grid-auto-columns:1fr;grid-auto-flow:column;gap:6px;padding:6px 12px;display:grid;position:sticky}.lesson-tab{border-radius:var(--radius-sm);min-height:44px;color:var(--text-dim);white-space:nowrap;text-overflow:ellipsis;background:0 0;border:1px solid #0000;padding:0 8px;font-family:inherit;font-size:13px;font-weight:700;transition:background .15s,color .15s,border-color .15s;overflow:hidden}.lesson-tab[aria-selected=true]{background:var(--accent-soft);color:var(--accent-strong);border-color:#f0b54552}.lesson-tab:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.lesson-panels{grid-template-columns:1fr;min-height:0}.lesson-page .panel-left,.lesson-page .panel-right{min-width:0;padding:16px 14px calc(96px + env(safe-area-inset-bottom,0px));border-right:none;overflow:clip}.lesson-panels [hidden],.panel-left.is-learn>.lab-block,.panel-left.is-lab>:not(.lab-block){display:none}.panel-left.is-lab>.lab-block{border-top:none;margin-top:0;padding-top:0}.panel-left.is-learn{padding-bottom:calc(28px + env(safe-area-inset-bottom,0px))}.lesson-page .lab-editor,.lesson-page .exercise-editor{max-width:100%;margin:10px 0}.lesson-page .cm-editor{max-width:100%;max-height:45vh;font-size:16px}.lesson-page .cm-content{font-size:16px}.lesson-page .cm-scroller{overscroll-behavior:contain;-webkit-overflow-scrolling:touch;overflow:auto}.lesson-page .lab-actions,.lesson-page .exercise-actions{z-index:3;padding:8px 14px calc(8px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--border-soft);background:var(--bg);grid-template-columns:1fr 1fr;gap:8px;margin:0 -14px;display:grid;position:sticky;bottom:0}.lesson-page .exercise-actions{background:var(--bg-raised)}.lesson-page .lab-actions .btn,.lesson-page .exercise-actions .btn{justify-content:center;min-width:0;min-height:44px}.lesson-page .exercise-actions .spacer{display:none}.lesson-page .console{white-space:pre;word-break:normal;-webkit-overflow-scrolling:touch;max-width:100%;max-height:190px;font-size:13px;overflow:auto}.lesson-page .md pre,.lesson-page .solution-box pre,.lesson-page .results-block pre{max-width:100%;overflow-x:auto}.lesson-page .md table{max-width:100%;display:block;overflow-x:auto}.lesson-page .hint-box,.lesson-page .solution-box,.lesson-page .feedback,.lesson-page .celebration{max-width:100%}}