:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f3f8ff;--surface:#fff;--ink:#101828;--muted:#475467;--line:#d6e6f5;--brand:#0057d9;--brand-2:#1597f5;--navy:#062a5c;--accent:#ff9d00;--soft:#dceeff;--sidebar:#062a5c;--sidebar-2:#062a5c;--easy:#047857;--medium:#b45309;--hard:#be123c;--advanced:#6d28d9;--shadow:0 12px 40px #0f172a0f;color:var(--ink);background:var(--bg);font-family:IBM Plex Sans,Segoe UI,sans-serif;line-height:1.5}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input,select{font:inherit}button{cursor:pointer}a{color:var(--brand)}h1,h2,h3,p{margin-top:0}h1{letter-spacing:-.03em;margin-bottom:.6rem;font-size:2rem;line-height:1.15}h2{margin-bottom:.45rem;font-size:1.15rem}h3{color:var(--ink);margin-bottom:.35rem;font-size:1rem}.app-shell{min-height:100vh;display:flex}.sidebar{width:250px;color:var(--ink);border-right:1px solid var(--line);background:#fff;flex:none;height:100vh;padding:18px 12px 28px;position:sticky;top:0;overflow:auto}.brand-row{align-items:flex-start;gap:8px;padding-bottom:14px;display:flex}.brand-row .sidebar-close{margin-left:auto}.brand{color:inherit;align-items:center;gap:10px;min-width:0;padding:4px 8px 0;text-decoration:none;display:flex}.brand strong{color:var(--navy);letter-spacing:-.02em;display:block}.brand span{color:var(--muted);font-size:.78rem}.brand-logo{object-fit:cover;object-position:center 8%;background:#fff;border-radius:12px;flex:none;width:48px;height:48px}.home-logo{object-fit:contain;object-position:center;border-radius:0;width:min(220px,72vw);height:auto}.brand-compact{padding:0}.brand-compact .brand-logo{width:38px;height:38px}.brand-compact strong{white-space:nowrap;font-size:.95rem}.sidebar-close,.menu-btn{display:none}.nav-group{margin-bottom:16px}.nav-group p{letter-spacing:.08em;text-transform:uppercase;color:#94a3b8;margin:0 8px 6px;font-size:.72rem}.nav-link{color:#334155;border-radius:10px;align-items:center;gap:8px;margin-bottom:2px;padding:8px 10px;text-decoration:none;display:flex}.nav-link span{flex:1}.nav-link em{color:#94a3b8;font-size:.75rem;font-style:normal}.nav-link.is-active,.nav-link:hover{background:var(--soft);color:var(--brand)}.workspace{flex-direction:column;flex:1;min-width:0;display:flex}.content{flex:1}.topbar{z-index:20;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#f3f8fff0;border-bottom:1px solid #e2e8f0cc;align-items:center;gap:10px;padding:14px 20px;display:flex;position:sticky;top:0}.content{max-width:1180px;padding:22px 20px 56px}.search-wrap{flex:1;position:relative}.search-box{border:1px solid var(--line);min-height:48px;box-shadow:var(--shadow);background:#fff;border-radius:14px;align-items:center;gap:10px;padding:0 12px;display:flex}.search-box input{width:100%;color:var(--ink);background:0 0;border:0;outline:none}.search-box kbd{border:1px solid var(--line);color:var(--muted);border-radius:7px;padding:2px 6px;font-family:IBM Plex Mono,monospace;font-size:.72rem}.search-results{border:1px solid var(--line);background:#fff;border-radius:16px;max-height:70vh;padding:8px;position:absolute;top:calc(100% + 8px);left:0;right:0;overflow:auto;box-shadow:0 20px 50px #0f172a1f}.search-hit{text-align:left;background:0 0;border:0;border-radius:12px;gap:4px;width:100%;padding:10px 12px;display:grid;position:relative}.search-hit.is-active,.search-hit:hover{background:var(--soft)}.search-hit strong{padding-right:22px}.search-hit-top,.q-badges,.hero-actions,.chip-row,.run-actions,.solution-row,.q-tools{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.search-topic,.q-topic,.search-desc{color:var(--muted);font-size:.86rem}.search-desc{-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.search-enter{color:var(--muted);position:absolute;top:14px;right:12px}.search-empty{color:var(--muted);margin:8px}.badge{background:var(--soft);color:var(--navy);border-radius:999px;align-items:center;padding:2px 8px;font-size:.72rem;font-weight:600;display:inline-flex}.tone-easy{color:var(--easy);background:#d1fae5}.tone-medium{color:var(--medium);background:#fef3c7}.tone-hard{color:var(--hard);background:#ffe4e6}.tone-advanced{color:var(--advanced);background:#ede9fe}.tone-coding{color:#0e7490;background:#cffafe}.tone-logic{color:#c2410c;background:#ffedd5}.tone-theory{color:#334155;background:#f1f5f9}.eyebrow{color:var(--brand);margin-bottom:6px;font-size:.82rem;font-weight:600}.page-head,.hero{justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:18px;display:flex}.page-head p,.hero p{color:var(--muted);max-width:68ch}.hero-card,.panel,.stat-card,.q-card,.mock-setup,.empty,.mini-progress{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px}.hero-card,.mini-progress{min-width:220px;padding:16px 18px}.hero-card strong,.mini-progress strong{font-size:2rem;display:block}.bar{background:#e2e8f0;border-radius:99px;height:8px;overflow:hidden}.bar span,.fill-easy,.fill-medium,.fill-hard,.fill-advanced{background:var(--brand-2);height:100%;display:block}.fill-easy{background:var(--easy)}.fill-medium{background:var(--medium)}.fill-hard{background:var(--hard)}.fill-advanced{background:var(--advanced)}.stat-grid,.dash-grid,.score-grid{gap:12px;display:grid}.stat-grid{grid-template-columns:repeat(4,1fr);margin-bottom:14px}.dash-grid{grid-template-columns:1.2fr 1fr}.score-grid{grid-template-columns:repeat(3,1fr);margin-bottom:14px}.stat-card,.score-grid article,.panel{padding:16px}.stat-card span,.score-grid span,.track-row span,.diff-row span{color:var(--muted)}.stat-card strong,.score-grid strong{font-size:1.6rem;display:block}.stat-card svg{color:var(--brand)}.track-row,.diff-row{grid-template-columns:1fr 90px;align-items:center;gap:6px 10px;margin-bottom:12px;display:grid}.track-row div:first-child{justify-content:space-between;gap:8px;display:flex}.track-row .bar,.diff-row .bar{grid-column:1/-1}.stack-actions,.today-list{gap:8px;display:grid}.today-list{margin:0;padding:0;list-style:none}.today-list button,.secondary-btn,.primary-btn,.ghost-btn,.icon-btn,.expand-btn,.text-btn,.chip{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:12px}.today-list button{text-align:left;width:100%;padding:10px 12px}.today-list span{color:var(--brand);font-size:.75rem;font-weight:600;display:block}.primary-btn,.secondary-btn,.ghost-btn,.icon-btn,.expand-btn{justify-content:center;align-items:center;gap:6px;min-height:44px;padding:10px 16px;font-weight:700;line-height:1.2;text-decoration:none;display:inline-flex}.primary-btn{background:var(--brand);color:#fff;border-color:var(--brand)}.primary-btn:disabled{opacity:.5;cursor:not-allowed}.text-btn{color:var(--brand);background:0 0;border:0;padding:0}.icon-btn.is-on{color:var(--brand);background:var(--soft);border-color:#9ec9fb}.icon-btn.is-done{color:var(--easy);background:#ecfdf5;border-color:#a7f3d0}.bank-layout{display:block}.filter-bar{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:14px;display:flex}.filter-bar select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:10px;margin-left:auto;padding:8px 10px}.subject-grid{grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:16px;display:grid}.subject-card{color:inherit;border:1px solid var(--line);box-shadow:var(--shadow);background:#fff;border-radius:16px;gap:4px;padding:16px;text-decoration:none;display:grid}.subject-card span{color:var(--muted)}.subject-card em{color:var(--muted);font-size:.86rem;font-style:normal}.subject-card:hover{background:#f5faff;border-color:#9ec9fb}.section-title{margin-bottom:10px}.panel-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.panel-head a{align-items:center;gap:6px;font-weight:600;text-decoration:none;display:inline-flex}.answer-box{background:#f8fafc;border-radius:12px;padding:12px 14px}.io-row p{margin-bottom:.35rem}.today-panel{padding:16px}.also-row{flex-wrap:wrap;gap:8px;margin:4px 0 16px;display:flex}.also-row a{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:999px;padding:6px 12px;font-size:.92rem;font-weight:600;text-decoration:none}.flow{justify-items:center;gap:0;padding:8px 0 4px;display:grid}.flow-step{justify-items:center;width:min(100%,520px);display:grid}.flow-arrow{background:#94a3b8;width:2px;height:16px}.flow-node{border:2px solid var(--brand);text-align:center;background:#fff;border-radius:12px;max-width:280px;padding:8px 14px}.flow-node.start,.flow-node.end{background:var(--soft);border-radius:999px;font-weight:700}.flow-node.io{background:#ecfeff}.flow-node.decision{background:#fff7ed;border-color:#c2410c;transform:none}.flow-branches{grid-template-columns:1fr 1fr;gap:10px;width:100%;display:grid}.flow-branches>div{justify-items:center;gap:6px;display:grid}.flow-branches span{color:var(--muted);font-size:.75rem;font-weight:700}.filters-head{justify-content:space-between;align-items:center;display:flex}.filters label,.filters fieldset{color:var(--muted);gap:6px;font-size:.86rem;display:grid}.filters select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:10px;padding:8px}.filters fieldset{border:0;margin:0;padding:0}.chip{padding:6px 10px}.chip.is-on{background:var(--soft);color:var(--brand);border-color:#9ec9fb}.result-count{color:var(--muted);margin-bottom:10px}.question-list{gap:12px;display:grid}.question-list.solo{max-width:920px}.q-card{padding:16px 16px 12px;scroll-margin-top:92px}.q-card.is-highlight{outline:2px solid var(--brand-2);box-shadow:0 0 0 6px #1597f529}.q-card.is-done{border-color:#a7f3d0}.q-head{justify-content:space-between;gap:10px;margin-bottom:8px;display:flex}.q-lead,.q-body p{color:#334155}.q-body{gap:12px;margin-top:12px;display:grid}.practice-grid,.complexity{grid-template-columns:1fr 1fr;gap:10px;display:grid}.tip{background:#f8fafc;border-radius:12px;padding:10px 12px}.expand-btn{background:#f8fafc;margin-top:8px}.empty{color:var(--muted);padding:28px}.code-block{color:#e2e8f0;background:#0b1220;border-radius:14px;overflow:hidden}.code-bar{color:#94a3b8;justify-content:space-between;align-items:center;padding:8px 10px;font-family:IBM Plex Mono,monospace;font-size:.75rem;display:flex}.code-bar .ghost-btn{color:#e2e8f0;background:0 0;border-color:#334155}.code-block pre{margin:0;padding:0 14px 14px;font-family:IBM Plex Mono,monospace;font-size:.86rem;line-height:1.6;overflow:auto}.tok-k{color:#c4b5fd}.tok-s{color:#86efac}.tok-n{color:#fcd34d}.tok-c{color:#94a3b8}.run-panel{color:#e2e8f0;background:#0f172a;border-radius:14px;margin-top:8px;padding:12px}.run-panel p,.run-label{color:#cbd5e1}.console{white-space:pre-wrap;background:#020617;border-radius:10px;padding:10px}.mock-setup{gap:14px;max-width:760px;padding:18px;display:grid}.mock-setup fieldset{border:0;padding:0}.hint{color:var(--muted)}.mock-progress{justify-content:space-between;align-items:flex-end;gap:12px;display:flex}.mock-controls{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.spacer{flex:1}.topic-pills{flex-wrap:wrap;gap:8px;padding:0;list-style:none;display:flex}.topic-pills li{background:var(--soft);color:var(--navy);border-radius:999px;padding:6px 10px}.backdrop{display:none}.home-hero{align-items:center}.learn-layout{grid-template-columns:250px 1fr;align-items:start;gap:16px;display:grid}.topic-nav,.lesson,.legal{border:1px solid var(--line);box-shadow:var(--shadow);background:#fff;border-radius:18px}.topic-nav{padding:12px;position:sticky;top:84px}.topic-nav p{color:var(--navy);margin:4px 8px 8px;font-weight:700}.topic-nav ol,.lesson-index{gap:4px;margin:0;padding:0;list-style:none;display:grid}.topic-nav a{color:var(--ink);border-radius:10px;align-items:flex-start;gap:8px;padding:7px 8px;text-decoration:none;display:flex}.topic-nav a em{color:var(--brand);min-width:1.2rem;font-style:normal;font-weight:700}.topic-nav a.is-active,.topic-nav a:hover{background:var(--soft)}.lesson-index a{color:inherit;border:1px solid var(--line);background:#fff;border-radius:14px;gap:2px;padding:12px 14px;text-decoration:none;display:grid}.lesson-index a em{color:var(--brand);font-size:.78rem;font-style:normal;font-weight:700}.lesson-index a span{color:var(--muted)}.lesson{gap:12px;padding:18px;display:grid}.lesson h1{margin-bottom:0}.lesson-kicker{color:var(--accent);margin:0;font-weight:700}.lesson-nav{justify-content:space-between;gap:12px;display:flex}.lesson-nav a{font-weight:700;text-decoration:none}.legal{max-width:760px;padding:22px}.legal h2{margin-top:1.2rem}.site-footer{border-top:1px solid var(--line);background:#fff;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:auto;padding:18px 20px 22px;display:flex}.site-footer strong{color:var(--navy)}.site-footer p{color:var(--muted);max-width:52ch;margin:4px 0 0}.site-footer nav{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.site-footer a{font-weight:700;text-decoration:none}@media (width<=980px){.stat-grid,.dash-grid,.score-grid,.subject-grid,.practice-grid{grid-template-columns:1fr}.filter-bar select{margin-left:0}.page-head,.hero,.mock-progress,.learn-layout,.site-footer{flex-direction:column;align-items:stretch}.learn-layout{grid-template-columns:1fr}.topic-nav{position:static}}@media (width<=800px){.sidebar{z-index:40;transition:transform .2s;position:fixed;transform:translate(-105%)}.sidebar.is-open{transform:none}.sidebar-close,.menu-btn{display:inline-flex}.backdrop{z-index:30;background:#0f172a73;border:0;display:block;position:fixed;inset:0}.search-box kbd{display:none}.stat-grid{grid-template-columns:1fr 1fr}.q-head{flex-direction:column}.content,.topbar{padding-left:12px;padding-right:12px}}.public-site{min-height:100vh;color:var(--ink);background:#fff;flex-direction:column;display:flex}.land-main{flex:1}.land-nav{z-index:30;border-bottom:1px solid var(--line);background:#fff;justify-content:space-between;align-items:center;gap:16px;padding:10px 28px;display:flex;position:sticky;top:0}.land-brand{align-items:center;text-decoration:none;display:flex}.land-logo{object-fit:contain;width:auto;height:74px}.land-menu{border:1px solid var(--line);color:var(--navy);background:#fff;border-radius:10px;padding:8px 12px;font-weight:700;display:none}.land-nav nav{align-items:center;gap:18px;display:flex}.land-nav nav a{color:var(--navy);font-weight:700;text-decoration:none}.land-nav nav a.active{color:var(--brand)}.land-nav nav a.primary-btn{color:#101828;background:var(--accent);border-color:var(--accent);text-decoration:none}.landing{background:radial-gradient(900px 420px at 90% -10%,#dceeff 0%,#dceeff00 70%),linear-gradient(#f7fbff 0%,#fff 28%)}.land-hero,.land-block{width:min(1120px,100% - 40px);margin:0 auto}.land-hero{grid-template-columns:1.05fr .95fr;align-items:center;gap:36px;padding:42px 0 20px;display:grid}.land-kicker{color:var(--accent);letter-spacing:.04em;text-transform:uppercase;font-size:.78rem;font-weight:800}.land-hero h1{color:var(--navy);max-width:14ch;font-size:clamp(2rem,4vw,3.3rem)}.land-hero p{color:var(--muted);font-size:1.05rem}.land-actions{margin-top:8px}.land-actions .primary-btn,.land-actions .secondary-btn,.preview-page .primary-btn{min-width:168px}.landing .secondary-btn{color:var(--navy);background:#fff;border-color:#b9d7f5}.landing .secondary-btn:hover{background:var(--soft);border-color:var(--brand-2)}.land-cta{background:var(--accent);border-color:var(--accent);color:#101828}.land-cta:hover{filter:brightness(.96)}.preview-page .primary-btn{margin-top:8px}.land-block .panel-head{margin-bottom:12px}.land-block .panel-head .secondary-btn{min-height:40px}.stage{gap:12px;display:grid}.editor,.preview{border-radius:18px;overflow:hidden;box-shadow:0 18px 50px #062a5c1f}.editor{color:#e8f2ff;background:#062a5c}.editor-top{background:#041e44;align-items:center;gap:6px;padding:10px 12px;display:flex}.editor-top span{background:#ff9d00;border-radius:99px;width:10px;height:10px}.editor-top span:nth-child(2){background:#1597f5}.editor-top span:nth-child(3){background:#dceeff}.editor-top strong{margin-left:8px;font-size:.8rem;font-weight:600}.editor pre{margin:0;padding:16px 18px 20px;font-family:IBM Plex Mono,monospace;font-size:.92rem;line-height:1.7;overflow:auto}.c-tag{color:#ff9d00}.preview{border:1px solid var(--line);background:#fff}.preview-bar{color:var(--navy);background:#dceeff;padding:8px 12px;font-size:.78rem;font-weight:700}.preview-page{padding:22px 18px 26px}.preview-page h2{color:var(--navy);font-size:1.8rem}.preview-page a{font-weight:800}.land-block{padding:28px 0}.land-block h2{color:var(--navy);font-size:1.7rem}.begin-grid,.steps ol{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.begin-card,.steps li{color:inherit;border:1px solid var(--line);box-shadow:var(--shadow);background:#fff;border-radius:16px;gap:4px;padding:16px;text-decoration:none;display:grid}.begin-card strong{color:var(--brand);font-size:1.15rem}.begin-card span,.steps p,.course-tile span{color:var(--muted)}.begin-card:hover{border-color:var(--brand-2);background:#f5faff}.tile-grid{grid-template-columns:repeat(4,1fr);gap:12px;display:grid}.course-tile{border-radius:16px;flex-direction:column;justify-content:space-between;min-height:112px;padding:16px;text-decoration:none;display:flex;box-shadow:0 10px 24px #10182814}.course-tile strong{font-size:1.35rem}.course-tile span{color:inherit;opacity:.9}.course-tile:hover{transform:translateY(-2px)}.steps{padding-bottom:56px}.steps ol{margin:0 0 16px;padding:0;list-style:none}.steps li strong{color:var(--navy)}.land-foot{background:var(--navy);color:#fff;flex-wrap:wrap;justify-content:space-between;gap:18px;margin-top:auto;padding:22px 28px;display:flex}.land-foot p{color:#dceeff;max-width:52ch;margin:6px 0 0}.land-foot nav{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.land-foot a{color:#fff;font-weight:700;text-decoration:none}.public-site .legal{margin:28px auto 48px}.bottom-nav{display:none}.page-chat{z-index:46;justify-items:end;gap:8px;display:grid;position:fixed;bottom:16px;right:16px}.chat-launcher,.chat-panel header button,.chat-panel form button{cursor:pointer;font:inherit;border:0}.chat-launcher{background:var(--accent);color:#101828;border-radius:999px;align-items:center;gap:8px;padding:12px 14px;font-weight:800;display:inline-flex;box-shadow:0 10px 24px #10182829}.chat-panel{border:1px solid var(--line);background:#fff;border-radius:18px;width:min(360px,100vw - 24px);overflow:hidden;box-shadow:0 18px 50px #062a5c2e}.chat-panel header,.chat-panel form{align-items:center;gap:8px;padding:10px;display:flex}.chat-panel header{background:var(--navy);color:#fff;justify-content:space-between}.chat-panel header button{color:#fff;background:0 0}.chat-log{background:#f3f8ff;gap:8px;max-height:320px;padding:10px;display:grid;overflow:auto}.chat-msg{background:#fff;border-radius:12px;padding:8px 10px}.chat-msg p{margin:0}.chat-msg.is-user{background:var(--soft);justify-self:end}.chat-links{gap:6px;margin-top:8px;display:grid}.chat-links a{color:var(--navy);border:1px solid var(--line);background:#fff;border-radius:10px;gap:2px;padding:8px;text-decoration:none;display:grid}.chat-links span{color:var(--brand);font-size:.75rem;font-weight:800}.chat-panel form input{border:1px solid var(--line);border-radius:10px;flex:1;min-width:0;padding:10px}.chat-panel form button{background:var(--brand);color:#fff;border-radius:10px;padding:10px}@media (width<=800px){.topbar .menu-btn,.nav-group-main,.dashboard .hero-actions{display:none}.dashboard h1{font-size:1.45rem}.hero-card{min-width:0}.sidebar{padding-bottom:92px}.workspace{padding-bottom:74px}.bottom-nav{z-index:45;border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom));background:#fff;grid-template-columns:repeat(5,1fr);display:grid;position:fixed;bottom:0;left:0;right:0}.bottom-nav a,.bottom-nav button{color:#667085;font:inherit;background:0 0;border:0;justify-items:center;gap:2px;padding:4px 0;font-size:.68rem;font-weight:700;text-decoration:none;display:grid}.bottom-nav a.is-active{color:var(--brand)}.page-chat{bottom:78px;right:10px}}@media (width<=900px){.land-hero,.begin-grid,.steps ol,.tile-grid{grid-template-columns:1fr 1fr}.land-hero{grid-template-columns:1fr}}@media (width<=800px){.land-nav{position:sticky}.land-nav nav{border-bottom:1px solid var(--line);background:#fff;grid-template-columns:1fr;padding:12px;display:none;position:absolute;top:100%;left:0;right:0}.land-nav nav.is-open{display:grid}.land-menu{display:inline-flex}.begin-grid,.steps ol,.tile-grid{grid-template-columns:1fr}.land-logo{height:58px}.land-actions .primary-btn,.land-actions .secondary-btn,.land-nav nav a.primary-btn{width:100%}}
