@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;600;700;800&family=Unbounded:wght@600;700&display=swap');
@import url('/public/catalog.css');

:root{--ink:#171717;--muted:#6d6d6d;--paper:#f5f3ee;--card:#fff;--accent:#c9ff42;--purple:#7c5cff;--line:#ddd9d0}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Manrope,Arial,sans-serif}.site-header{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 max(5vw,24px);border-bottom:1px solid var(--line);background:rgba(245,243,238,.92);position:sticky;top:0;z-index:5;backdrop-filter:blur(12px)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:Unbounded,sans-serif;font-size:18px}.brand-mark{display:grid;place-items:center;width:36px;height:36px;background:var(--ink);color:var(--accent);border-radius:12px;transform:rotate(-5deg)}nav{display:flex;align-items:center;gap:28px}nav a{color:var(--ink);text-decoration:none;font-weight:600}.ghost,.primary,.search button,.filters button,.answer-form button{font:inherit;border:0;cursor:pointer;font-weight:800}.ghost{background:transparent;border:1px solid var(--ink);border-radius:12px;padding:10px 16px}.hero{min-height:590px;padding:72px max(5vw,24px);display:grid;grid-template-columns:1.15fr .85fr;gap:7vw;align-items:center;overflow:hidden;background:radial-gradient(circle at 75% 35%,#e5dbff 0,transparent 30%),var(--paper)}.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:800;color:#6657a8}.hero h1,.section-heading h2,.modal-card h2{font-family:Unbounded,sans-serif;letter-spacing:-.04em}.hero h1{font-size:clamp(42px,5.2vw,76px);line-height:1.02;margin:16px 0 24px}.hero h1 em{font-style:normal;color:var(--purple)}.hero-copy>p{font-size:18px;line-height:1.65;max-width:660px;color:#555}.search{display:flex;max-width:680px;background:#fff;border:1px solid var(--line);padding:7px;border-radius:17px;box-shadow:0 18px 50px #27231b12;margin:30px 0 22px}.search input{flex:1;border:0;padding:13px;font:inherit;outline:none;min-width:0}.search button,.primary{background:var(--ink);color:white;border-radius:12px;padding:14px 20px}.hero-actions{display:flex;align-items:center;gap:24px}.hero-actions a{font-weight:800;color:var(--ink)}.answer-preview{background:var(--ink);color:white;border-radius:28px;padding:32px;transform:rotate(2deg);box-shadow:24px 24px 0 var(--accent)}.preview-top{display:flex;justify-content:space-between;color:#bdbdbd;font-size:13px}.status{color:var(--accent)}.answer-preview h2{font-size:22px;margin:28px 0 8px}.formula{font-family:Unbounded,sans-serif;font-size:30px;color:var(--accent);padding:18px 0 28px}.answer-preview ol{list-style:none;padding:0;margin:0;counter-reset:steps}.answer-preview li{counter-increment:steps;display:grid;grid-template-columns:32px 1fr;gap:6px 12px;border-top:1px solid #3a3a3a;padding:16px 0}.answer-preview li:before{content:counter(steps);grid-row:1/3;background:#303030;border-radius:50%;width:26px;height:26px;display:grid;place-items:center;color:var(--accent)}.answer-preview li span{color:#aaa;font-size:13px}.subjects,.question-section{padding:76px max(5vw,24px)}.section-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:30px}.section-heading h2{font-size:clamp(30px,4vw,48px);margin:10px 0 0}.section-heading>span{color:var(--muted)}.subject-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}.subject-card{position:relative;min-height:185px;padding:20px;background:white;border:1px solid var(--line);border-radius:20px;color:var(--ink);text-decoration:none;display:flex;flex-direction:column;transition:.2s}.subject-card:hover{transform:translateY(-5px);box-shadow:0 18px 30px #241c0f10}.subject-icon{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;font-family:Unbounded;font-weight:700;margin-bottom:auto}.lime{background:#eaffb6}.violet{background:#e4ddff}.blue{background:#d9edff}.orange{background:#ffe4bd}.green{background:#d9f4d7}.pink{background:#ffddeb}.subject-card strong{font-size:16px;margin-top:20px}.subject-card small{color:var(--muted);margin-top:4px}.arrow{position:absolute;right:18px;top:18px}.question-section{background:#ebe8e0}.small{padding:12px 18px}.filters{display:grid;grid-template-columns:2fr 1fr 1fr auto;gap:10px;margin-bottom:18px}.filters input,.filters select,.filters button,.answer-form input,.answer-form button{border:1px solid var(--line);background:white;border-radius:12px;padding:13px;font:inherit}.filters button,.answer-form button{background:var(--ink);color:#fff}.question-list{display:grid;gap:12px}.question-card{background:#fff;border-radius:20px;padding:25px;display:grid;grid-template-columns:75px 1fr;gap:18px;border:1px solid var(--line)}.vote{text-align:center;display:flex;flex-direction:column;align-items:center;color:var(--muted);font-size:11px}.vote button{border:0;background:#eefbd0;border-radius:10px;width:36px;height:36px;font-size:20px}.vote b{font-size:20px;color:var(--ink);margin-top:8px}.tags{display:flex;gap:7px}.tags span,.verified{font-size:11px;font-weight:800;background:#ece8ff;color:#6651ba;border-radius:20px;padding:5px 9px}.question-main h3{font-size:20px;margin:12px 0 8px}.question-main>p{color:#555;line-height:1.6;margin:0}.meta{display:flex;gap:18px;color:#898989;font-size:12px;margin-top:18px}.question-main details{margin-top:18px;border-top:1px solid var(--line);padding-top:16px}.question-main summary{font-weight:800;cursor:pointer}.solution{background:#f7f7f4;border-radius:14px;padding:18px;margin-top:12px;line-height:1.65}.solution-author{display:flex;align-items:center;gap:8px}.avatar{width:28px;height:28px;display:grid;place-items:center;background:var(--accent);border-radius:50%;font-weight:800}.answer-form{display:flex;gap:8px;margin-top:14px}.answer-form input{flex:1}.empty{background:white;padding:35px;border-radius:18px;text-align:center;color:var(--muted)}footer{display:flex;align-items:center;gap:28px;padding:35px max(5vw,24px);background:var(--ink);color:#aaa}footer .brand{color:white}.footer-brand{margin-right:auto}.developer{color:var(--accent);text-decoration:none;font-weight:700}dialog{border:0;border-radius:24px;padding:0;max-width:620px;width:calc(100% - 32px);box-shadow:0 30px 90px #0005}dialog::backdrop{background:#121212aa;backdrop-filter:blur(4px)}.modal-card{padding:34px;display:grid;gap:16px;position:relative}.modal-card h2{font-size:31px;margin:0}.modal-card label{display:grid;gap:7px;font-size:13px;font-weight:800}.modal-card input,.modal-card textarea,.modal-card select{width:100%;border:1px solid var(--line);border-radius:12px;padding:13px;font:inherit}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.close{position:absolute;right:18px;top:15px;border:0;background:transparent;font-size:28px;cursor:pointer}.flash{position:fixed;right:20px;top:95px;z-index:10;background:var(--ink);color:white;padding:15px 20px;border-radius:12px;box-shadow:0 10px 30px #0003}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(max-width:1050px){.subject-grid{grid-template-columns:repeat(3,1fr)}.hero{grid-template-columns:1fr}.answer-preview{max-width:650px}.hero-copy{max-width:800px}}
@media(max-width:680px){nav a{display:none}.site-header{height:68px}.hero{padding-top:48px}.hero h1{font-size:39px}.search{display:grid}.hero-actions{align-items:flex-start;flex-direction:column}.subject-grid{grid-template-columns:repeat(2,1fr)}.section-heading{align-items:flex-start;gap:16px}.section-heading>span{display:none}.filters{grid-template-columns:1fr}.question-card{grid-template-columns:1fr}.vote{flex-direction:row;gap:8px;justify-content:flex-start}.vote b{margin:0}.answer-form{flex-direction:column}footer{align-items:flex-start;flex-direction:column}.footer-brand{margin:0}.form-row{grid-template-columns:1fr}}

/* Brand, motivation loop and PWA navigation */
.brand-mark{width:48px;font-size:11px}.progress-section{padding:28px max(5vw,24px);display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:14px;background:var(--ink)}.level-card,.quest-card{background:#272727;color:white;border:1px solid #3d3d3d;border-radius:20px;padding:22px}.level-card{background:var(--accent);color:var(--ink)}.level-top{display:flex;justify-content:space-between;align-items:center}.level-top strong{font-family:Unbounded}.score{margin:18px 0 10px;display:flex;align-items:baseline;gap:9px}.score b{font:700 38px Unbounded}.score span{font-size:13px}.progress-track{height:8px;background:#17171730;border-radius:10px;overflow:hidden;margin-bottom:7px}.progress-track i{display:block;height:100%;background:var(--ink);border-radius:10px}.quest-card{display:flex;align-items:center;gap:16px}.quest-card h3{margin:5px 0}.quest-card p{margin:0;color:#aaa;font-size:13px}.quest-icon{font-size:30px}.daily{background:#302a45}.thanks{border:0;background:#eaf8c9;border-radius:20px;padding:8px 12px;font-weight:800;cursor:pointer}.thanks.clicked{background:var(--accent)}.mobile-nav{display:none}
.meme-chip{display:inline-block;background:var(--accent);border:2px solid var(--ink);border-radius:9px 16px 16px 16px;padding:9px 14px;font-size:13px;font-weight:800;transform:rotate(-1deg);box-shadow:5px 5px 0 var(--ink)}
.metric-pixel{position:absolute;left:-9999px}.user-pill{background:#fff;border-radius:20px;padding:9px 12px;font-size:12px;font-weight:800;white-space:nowrap}.pricing-section{padding:76px max(5vw,24px);background:#f5f3ee}.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;align-items:stretch}.price-card{position:relative;background:white;border:1px solid var(--line);border-radius:24px;padding:28px}.price-card.featured{background:var(--ink);color:white;transform:translateY(-10px);box-shadow:14px 14px var(--accent)}.price-card .plan{font-weight:800;text-transform:uppercase;letter-spacing:.14em;font-size:12px}.price-card h3{font:700 40px Unbounded;margin:18px 0 3px}.price-card>p{color:var(--muted)}.price-card ul{list-style:'✓  ';padding-left:21px;line-height:2}.price-card button{width:100%;margin-top:12px}.popular{position:absolute;right:18px;top:18px;background:var(--accent);color:var(--ink);padding:6px 10px;border-radius:20px;font-size:10px;font-weight:800}.billing-note{text-align:center;color:var(--muted);font-size:12px;margin-top:28px}.auth-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:860px){.pricing-grid{grid-template-columns:1fr}.price-card.featured{transform:none}.site-header>nav .user-pill{display:none}}
.question-link{color:inherit;text-decoration:none}.question-link:hover{text-decoration:underline}.question-page{padding:34px max(5vw,24px) 80px}.breadcrumbs{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:28px}.breadcrumbs a{color:inherit}.question-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:24px;align-items:start}.question-article{background:white;border:1px solid var(--line);border-radius:24px;padding:clamp(22px,4vw,48px)}.question-article h1{font:700 clamp(30px,4vw,52px)/1.12 Unbounded;margin:20px 0}.task-text{font-size:19px;line-height:1.75;background:#f6f4ef;border-radius:16px;padding:24px}.source{font-size:13px;color:var(--muted)}.meme-break{background:var(--accent);border:2px solid var(--ink);border-radius:14px;padding:15px;font-weight:800;margin:24px 0;transform:rotate(-.5deg)}.answers-block h2{font:700 30px Unbounded}.question-sidebar{display:grid;gap:14px;position:sticky;top:95px}.side-cta,.side-list{background:var(--ink);color:white;border-radius:20px;padding:24px}.side-cta h3{font:700 24px Unbounded}.side-cta p{color:#aaa;line-height:1.6}.side-cta a{display:block;text-align:center;text-decoration:none}.side-list{background:white;color:var(--ink);border:1px solid var(--line)}.side-list>a{display:grid;gap:5px;color:var(--ink);text-decoration:none;padding:13px 0;border-top:1px solid var(--line);font-weight:700}.side-list small{color:var(--muted)}@media(max-width:900px){.question-layout{grid-template-columns:1fr}.question-sidebar{position:static}.question-page{padding-inline:16px}}
@media(max-width:1050px){.progress-section{grid-template-columns:1fr 1fr}.level-card{grid-column:1/-1}}
@media(max-width:680px){body{padding-bottom:72px}.site-header>nav a,.site-header>nav .install{display:none}.progress-section{grid-template-columns:1fr}.level-card{grid-column:auto}.mobile-nav{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);bottom:0;left:0;right:0;z-index:12;background:#171717;color:white;padding:8px 8px calc(8px + env(safe-area-inset-bottom));border-top:1px solid #333}.mobile-nav a,.mobile-nav button{background:transparent;border:0;color:white;text-decoration:none;display:grid;place-items:center;gap:2px;font-size:20px}.mobile-nav span{font:600 10px Manrope}.mobile-nav button{color:var(--accent)}}
.modes-section{padding:76px max(5vw,24px);background:#fff}.mode-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.mode-grid a{min-height:190px;background:#f3f0e8;border:1px solid var(--line);border-radius:20px;padding:22px;color:var(--ink);text-decoration:none;display:flex;flex-direction:column;gap:10px}.mode-grid b{font:700 18px Unbounded}.mode-grid span{color:var(--muted);line-height:1.5}.mode-grid i{font-style:normal;font-weight:800;margin-top:auto}.mode-grid .kege{background:var(--ink);color:white;box-shadow:8px 8px var(--accent)}.mode-grid .olymp{background:#302a45;color:white}.trainer-page,.result-page{padding:42px max(5vw,24px) 100px}.exam-status{display:flex;gap:16px;align-items:center}.trainer-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:25px}.trainer-head h1,.result-hero h1{font:700 clamp(34px,5vw,62px) Unbounded;margin:10px 0}.task-progress{background:var(--accent);padding:12px 16px;border-radius:14px}.task-nav{display:flex;gap:7px;flex-wrap:wrap;position:sticky;top:78px;background:var(--paper);padding:12px 0;z-index:3}.task-nav a{width:34px;height:34px;display:grid;place-items:center;background:white;border:1px solid var(--line);border-radius:9px;color:var(--ink);text-decoration:none}.task-nav a.done{background:var(--accent)}.trainer-list{display:grid;gap:16px}.trainer-task{background:white;border:1px solid var(--line);border-radius:22px;padding:clamp(20px,4vw,38px)}.task-number{display:flex;align-items:center;gap:12px}.task-number>span{width:44px;height:44px;display:grid;place-items:center;background:var(--ink);color:var(--accent);border-radius:13px;font-weight:800}.task-number div{display:grid}.task-number small{color:var(--muted)}.answer-input{display:grid;gap:8px;margin-top:22px;font-weight:800}.answer-input input{max-width:480px;border:2px solid var(--ink);border-radius:12px;padding:14px;font:inherit}.submit-exam{position:sticky;bottom:12px;background:var(--ink);color:white;border-radius:18px;padding:18px 22px;display:flex;justify-content:space-between;align-items:center;margin-top:22px;box-shadow:0 15px 45px #0004}.submit-exam div{display:grid}.submit-exam span{color:#aaa;font-size:12px}.big-empty{padding:60px}.result-page{display:grid;grid-template-columns:360px 1fr;gap:22px;align-items:start}.result-hero{position:sticky;top:100px;background:var(--ink);color:white;border-radius:24px;padding:30px}.result-ring{width:130px;height:130px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:var(--ink);font:700 28px Unbounded}.result-list{display:grid;gap:12px}.result-item{background:white;border-left:7px solid #ef5757;border-radius:16px;padding:22px}.result-item.correct{border-color:#75c850}@media(max-width:1200px){.mode-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:760px){.mode-grid{grid-template-columns:1fr}.trainer-head{align-items:flex-start;flex-direction:column}.result-page{grid-template-columns:1fr}.result-hero{position:static}.submit-exam{align-items:stretch;flex-direction:column;gap:12px}.exam-status span{display:none}}