:root{
  --bg:#0c0c0e; --panel:#141417; --card:#0a0a0c; --line:#25252b; --soft:#1a1a1f;
  --text:#f4f4f5; --dim:#8e8e98; --acc:#3d8bff; --acc-2:#7fb0ff; --danger:#ff7b7b; --ok:#4cd68a;
  --font:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;line-height:1.5}
a{color:inherit;text-decoration:none}
h1,h2,h3,p{margin:0}
h1,h2,h3{font-weight:700;letter-spacing:-.02em}
h3{letter-spacing:-.01em}
button,input{font:inherit}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:3rem;padding:0 24px;border-radius:999px;border:1px solid transparent;font-weight:600;font-size:0.9375rem;cursor:pointer;transition:background .2s var(--ease),transform .15s,opacity .2s;white-space:nowrap}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-primary{background:var(--acc);color:#fff}
.btn-primary:hover:not(:disabled){background:#5a9cff}
.btn-ghost{background:var(--soft);color:var(--text);border-color:var(--line)}
.btn-ghost:hover:not(:disabled){background:#23232a}
.btn-block{width:100%;height:3.5rem;font-size:1rem}

/* nav */
.site-nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:24px;padding:14px max(20px,calc((100% - 1160px)/2));background:rgba(12,12,14,.8);backdrop-filter:blur(14px);border-bottom:1px solid #17171b}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1875rem;letter-spacing:-.02em}
.brand-mark{color:var(--acc);font-size:1.375rem;line-height:1}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav-link{padding:9px 16px;border-radius:999px;color:var(--dim);font-size:0.9062rem;font-weight:500;transition:.2s}
.nav-link:hover{color:var(--text);background:var(--soft)}
.nav-user{padding:9px 14px;font-size:0.875rem;color:var(--text);border-left:1px solid var(--line);margin-left:8px}
.nav-cta{background:var(--soft);color:var(--text);border:1px solid var(--line)}
.nav-burger{display:none;margin-left:auto;background:none;border:0;width:40px;height:40px;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;align-items:center}
.nav-burger span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* auth */
.auth-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:24px;min-height:100vh;padding:20px}
.auth-main{display:flex;align-items:center;justify-content:center;padding:24px 8px}
.auth-wrap{width:100%;max-width:420px}
.auth-home{display:flex;justify-content:center;align-items:center;gap:10px;margin-bottom:20px;font-weight:700;font-size:1.1875rem;letter-spacing:-.02em;color:var(--text)}
.auth-home .brand-mark{color:var(--acc);font-size:1.375rem;line-height:1}
.seg{display:flex;padding:6px;background:#141417;border-radius:999px}
.seg-item{flex:1;text-align:center;padding:12px;border-radius:999px;color:var(--dim);font-weight:600;font-size:0.9375rem;transition:.2s}
.seg-item.active{background:var(--card);color:var(--text)}
.auth-card{margin-top:18px;padding:32px;background:#0b0b0e;border:1px solid #1d1d23;border-radius:28px;box-shadow:0 30px 80px -30px #000}
.auth-title{text-align:center;font-size:1.25rem;margin-bottom:24px}
.auth-sub{text-align:center;color:var(--dim);font-size:0.9375rem;margin-bottom:22px}
.auth-form{display:grid;gap:18px}
.field{display:grid;gap:8px}
.field-label{font-size:0.9375rem;color:#d4d4d8}
.field-optional{color:var(--dim);font-size:0.8125rem}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field input{width:100%;height:3.5rem;padding:0 18px;background:#101013;border:1px solid var(--line);border-radius:16px;color:var(--text);font-size:1rem;outline:0;transition:border-color .2s,box-shadow .2s}
.field input::placeholder{color:#6b6b75}
.field input:focus{border-color:var(--acc);box-shadow:0 0 0 3px rgba(61,139,255,.15)}
.pw{position:relative}
.pw input{padding-right:52px}
.eye{position:absolute;right:8px;top:50%;transform:translateY(-50%);width:40px;height:40px;display:grid;place-items:center;background:none;border:0;color:var(--dim);cursor:pointer;border-radius:50%}
.eye:hover{color:var(--text)}
.field-error{display:none;font-size:0.8125rem;color:var(--danger);padding-left:4px}
.field-error.visible{display:block}
.field input.input-error{border-color:var(--danger);box-shadow:0 0 0 3px rgba(255,123,123,.1)}
.form-error{display:none;padding:12px 14px;border-radius:14px;background:rgba(255,123,123,.08);border:1px solid rgba(255,123,123,.25);color:var(--danger);font-size:0.875rem}
.form-error.visible{display:block}
.resend-prompt{display:grid;gap:8px;margin-top:10px}
.resend-prompt .btn{height:2.75rem;font-size:0.875rem}
.resend-message{color:var(--dim);font-size:0.8125rem}
.auth-switch{margin-top:20px;text-align:center;color:var(--dim);font-size:0.875rem}
.auth-switch a{color:var(--text);text-decoration:underline;text-underline-offset:3px}
.auth-back{display:flex;justify-content:center;gap:8px;margin-top:26px;font-weight:600;font-size:0.9375rem;color:var(--dim)}
.auth-back:hover{color:var(--text)}
.auth-icon{width:64px;height:64px;margin:0 auto 18px;border-radius:50%;display:grid;place-items:center;background:rgba(61,139,255,.12);color:var(--acc)}
.auth-icon.bad{background:rgba(255,123,123,.1);color:var(--danger)}
.eyebrow{text-align:center;color:var(--acc-2);font-size:0.8125rem;font-weight:600;margin-bottom:8px}

/* auth stage: анимация построения фигуры */
.page-auth{background:#000}
.auth-stage{position:sticky;top:20px;height:calc(100vh - 40px);align-self:start;display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:0}
#stage-canvas{flex:1;width:100%;min-height:0;display:block}
.stage-formula{padding:0 24px 40px;text-align:center;color:#c4d8ff;font-size:clamp(0.9375rem,1.55vw,1.3125rem);text-shadow:0 0 12px rgba(47,107,255,.9),0 0 32px rgba(47,107,255,.5)}
.stage-formula .katex-display{margin:0}
.stage-formula .katex{color:inherit}
@media(max-width:960px){.auth-stage{display:none}}

/* home */
main{display:block}
.container{width:min(1160px,100% - 40px);margin-inline:auto}
.hero{position:relative;padding:72px 0 48px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-20% 10% auto;height:420px;background:radial-gradient(closest-side,rgba(61,139,255,.22),transparent);pointer-events:none}
.pill{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;background:var(--soft);border:1px solid var(--line);color:var(--acc-2);font-size:0.8125rem;font-weight:600;margin-bottom:24px}
.hero-title{position:relative;font-size:clamp(2.125rem,5.2vw,4rem);line-height:1.04;letter-spacing:-.035em;max-width:680px;margin:0 0 20px}
.hero-sub{position:relative;max-width:560px;margin:0 0 32px;color:var(--dim);font-size:1.125rem}
.hero-actions{position:relative;display:flex;gap:12px;justify-content:flex-start;flex-wrap:wrap}
.section{padding:56px 0}
.section h2{font-size:clamp(1.625rem,3.5vw,2.25rem);margin-bottom:8px}
.section-sub{color:var(--dim);margin-bottom:32px}
.section .section-title-solo{margin-bottom:24px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.ticket-card{display:flex;flex-direction:column;gap:12px;padding:26px;background:var(--panel);border:1px solid var(--line);border-radius:24px;transition:border-color .25s,transform .25s var(--ease)}
.ticket-card:hover{border-color:#3a3a44;transform:translateY(-3px)}
.ticket-top{display:flex;justify-content:space-between;align-items:center}
.ticket-num{font-size:0.8125rem;color:var(--dim)}
.ticket-price{padding:6px 14px;border-radius:999px;background:rgba(61,139,255,.14);color:var(--acc-2);font-weight:700;font-size:0.875rem}
.ticket-title{font-size:1.25rem;line-height:1.25}
.ticket-short{color:#d4d4d8;font-size:0.9375rem}
.ticket-desc{color:var(--dim);font-size:0.875rem;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.ticket-card.is-link{position:relative;cursor:pointer}
.ticket-card.is-link:hover,.ticket-card.is-link:focus-within{border-color:var(--acc-2);transform:translateY(-4px);box-shadow:0 18px 40px -20px rgba(61,139,255,.45)}
.ticket-card.is-link:active{transform:translateY(-1px)}
.ticket-link{all:unset;color:inherit;cursor:pointer}
.ticket-link::after{content:"";position:absolute;inset:0;border-radius:24px}   /* вся карточка — одна большая кнопка */
.ticket-card.is-link:has(.ticket-link:focus-visible){outline:2px solid var(--acc-2);outline-offset:3px}
.ticket-card.is-link:hover .ticket-title{color:var(--acc-2)}
.ticket-footer{margin-top:auto;padding-top:8px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.ticket-badge{padding:4px 12px;border-radius:999px;background:rgba(76,214,138,.14);color:var(--ok);font-size:0.8125rem;font-weight:600}
.ticket-badge[hidden]{display:none}
.product-modal{width:min(640px,calc(100% - 32px));max-height:calc(100dvh - 48px);padding:0;border:1px solid var(--line);border-radius:28px;background:var(--panel);color:var(--text);box-shadow:0 40px 100px -30px #000;overflow:hidden}
.product-modal::backdrop{background:rgba(5,5,8,.72);backdrop-filter:blur(4px)}
.product-modal[open]{animation:pm-in .25s var(--ease)}
.product-modal.is-closing{animation:pm-out .2s var(--ease) forwards}
.product-modal[open]::backdrop{animation:fade-in .25s var(--ease)}
.product-modal.is-closing::backdrop{animation:fade-out .2s var(--ease) forwards}
@keyframes pm-in{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
@keyframes pm-out{from{opacity:1;transform:none}to{opacity:0;transform:translateY(14px) scale(.98)}}
@keyframes fade-in{from{opacity:0}}
@keyframes fade-out{to{opacity:0}}
/* на телефоне окно курса — лист снизу: выезжает снизу и уходит вниз */
@media(max-width:600px){
  .product-modal{width:100%;max-width:100%;margin:auto 0 0;border-radius:28px 28px 0 0;border-bottom:0;max-height:90dvh}
  .product-modal[open]{animation:sheet-in .3s var(--ease)}
  .product-modal.is-closing{animation:sheet-out .22s var(--ease) forwards}
  .pm-body{max-height:90dvh;padding-bottom:calc(30px + env(safe-area-inset-bottom))}
}
@keyframes sheet-in{from{transform:translateY(100%)}to{transform:none}}
@keyframes sheet-out{from{transform:none}to{transform:translateY(100%)}}
.pm-body{position:relative;display:flex;flex-direction:column;gap:14px;padding:30px;max-height:calc(100dvh - 48px);overflow-y:auto}
.pm-body .ticket-top{padding-right:44px}
.pm-title{font-size:clamp(1.5rem,4vw,1.875rem);line-height:1.2}
.pm-desc{color:#c9c9d1;font-size:1rem;line-height:1.65;white-space:pre-line}
.pm-action{padding-top:6px}
.pm-action .btn{width:100%}
.pm-close{position:absolute;top:18px;right:18px;width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--soft);color:var(--dim);font-size:1.375rem;line-height:1;cursor:pointer;transition:color .2s,border-color .2s}
.pm-close:hover{color:var(--text);border-color:#3a3a44}
.ticket-action{margin-top:auto;padding-top:8px}
.ticket-action .btn{width:100%}
.ticket-msg{font-size:0.8125rem;min-height:0}
.ticket-msg.success{color:var(--ok)}
.ticket-msg.error{color:var(--danger)}
.empty-state,.empty-state-card{color:var(--dim);padding:40px;text-align:center;border:1px dashed var(--line);border-radius:24px;grid-column:1/-1}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.steps div{padding:24px;border-radius:24px;background:var(--panel);border:1px solid var(--line)}
.steps b{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:rgba(61,139,255,.15);color:var(--acc-2);margin-bottom:14px}
.steps h3{font-size:1.0625rem;margin-bottom:6px}
.steps p{color:var(--dim);font-size:0.9062rem}
.faq{display:grid;gap:10px;max-width:760px}
.faq details{padding:18px 22px;border-radius:18px;background:var(--panel);border:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between}
.faq summary::after{content:"+";color:var(--dim)}
.faq details[open] summary::after{content:"–"}
.faq p{margin-top:10px;color:var(--dim);font-size:0.9375rem}
.toast{position:fixed;top:78px;left:50%;transform:translateX(-50%);z-index:60;padding:12px 20px;border-radius:999px;background:#10231a;border:1px solid rgba(76,214,138,.35);color:var(--ok);font-size:0.875rem;font-weight:600;animation:toast 5s forwards}
@keyframes toast{0%{opacity:0;transform:translate(-50%,-10px)}8%,85%{opacity:1;transform:translate(-50%,0)}100%{opacity:0;visibility:hidden}}

/* profile */
.profile-hero{text-align:center;padding:72px 20px 24px}
.profile-title{font-size:clamp(1.75rem,4vw,2.5rem)}
.profile-sub{color:var(--dim);margin-top:6px}
.profile-body{width:min(760px,100% - 40px);margin:24px auto 60px}
.profile-body h2{margin-bottom:18px}
.stub-list{display:grid;gap:12px}
.stub-card{display:flex;align-items:center;gap:16px;justify-content:space-between;padding:18px 22px;background:var(--panel);border:1px solid var(--line);border-radius:20px}
.stub-info{display:grid;flex:1}
.stub-name{font-weight:600}
.stub-date{color:var(--dim);font-size:0.8125rem}
.materials-head .eyebrow{text-align:left}

@media(max-width:960px){
  .auth-layout{grid-template-columns:1fr}
  .auth-visual{display:none}
  .nav-burger{display:flex}
  /* меню выезжает из-под шапки и уходит обратно тем же путём */
  .nav-links{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;padding:12px 20px 20px;background:var(--bg);border-bottom:1px solid var(--line);margin:0;visibility:hidden;opacity:0;transform:translateY(-8px);pointer-events:none;transition:opacity .2s var(--ease),transform .2s var(--ease),visibility 0s linear .2s}
  .nav-links.open{visibility:visible;opacity:1;transform:none;pointer-events:auto;transition:opacity .2s var(--ease),transform .2s var(--ease),visibility 0s}
  .nav-user{border:0;margin:0}
}
@media(max-width:480px){.auth-card{padding:24px 20px}.field-row{grid-template-columns:1fr}}

/* hero: текст + видео */
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);align-items:center;gap:40px}
.hero-media{position:relative}
.hero-video{position:relative;width:100%;max-width:448px;margin-left:auto}
.hero-video video{display:block;width:100%;background:transparent}
/* плавное растворение нижнего и боковых краёв через прозрачность */
.hero-video video{
 -webkit-mask-image:linear-gradient(to bottom,#000 58%,rgba(0,0,0,.55) 80%,transparent 99%),linear-gradient(to right,transparent 0,#000 5%,#000 95%,transparent 100%);
 mask-image:linear-gradient(to bottom,#000 58%,rgba(0,0,0,.55) 80%,transparent 99%),linear-gradient(to right,transparent 0,#000 5%,#000 95%,transparent 100%);
 -webkit-mask-composite:source-in;mask-composite:intersect}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:24px;text-align:center}.hero-title,.hero-sub{margin-left:auto;margin-right:auto}.hero-actions{justify-content:center}.hero-video{margin:0 auto;max-width:340px}}

/* покупка: состояние ожидания */
.btn.is-loading::before{content:"";width:14px;height:14px;border-radius:50%;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.muted{color:var(--dim)}.small{font-size:0.8125rem}

/* страница курса */
.course{display:grid;grid-template-columns:320px minmax(0,1fr);gap:28px;padding:32px 0 64px;align-items:start}
.course-side{position:sticky;top:84px;padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:24px;max-height:calc(100vh - 104px);overflow:auto}
.course-back{display:inline-flex;align-items:center;gap:8px;color:var(--dim);font-size:0.9375rem;font-weight:600;transition:color .2s}
.course-back:hover{color:var(--text)}
.course-name{font-size:1.25rem;line-height:1.25;margin-bottom:16px}
.course-progress{margin-bottom:18px}
.course-progress .bar{height:6px;border-radius:99px;background:#22222a;overflow:hidden;margin-bottom:8px}
.course-progress .bar span{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--acc),var(--acc-2));transition:width .4s var(--ease)}
.course-progress small{color:var(--dim)}
.topics{display:grid;gap:6px}
.topic{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:14px;color:#c9c9d1;font-size:0.9375rem;line-height:1.3;border:1px solid transparent;transition:background .2s,color .2s}
.topic:hover{background:var(--soft);color:var(--text)}
.topic.active{background:rgba(61,139,255,.14);border-color:rgba(61,139,255,.35);color:#fff}
.topic-num{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:#22222a;font-size:0.75rem;font-weight:700;color:var(--dim)}
.topic.active .topic-num{background:var(--acc);color:#fff}
.topic-title{flex:1}
.topic-check{display:none;color:var(--ok);font-weight:700}
.topic.done .topic-check{display:block}
.topics-empty{color:var(--dim);font-size:0.875rem;padding:8px 12px}

.course-main{min-width:0;transition:opacity .2s}
.course-main.loading{opacity:.45;pointer-events:none}
.lesson{padding:34px;background:var(--panel);border:1px solid var(--line);border-radius:24px}
.lesson h1{font-size:clamp(1.5rem,3vw,2.125rem);margin-bottom:20px}
.lesson .lead{font-size:1.125rem;color:#d4d4d8;margin-bottom:14px}
.eyebrow-left{color:var(--acc-2);font-size:0.8125rem;font-weight:600;margin-bottom:8px}
.video-wrap{position:relative;aspect-ratio:16/9;border-radius:18px;overflow:hidden;background:#000;border:1px solid var(--line);margin-bottom:26px}
.video-wrap iframe,.video-wrap video{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-empty{position:absolute;inset:0;display:grid;place-content:center;justify-items:center;gap:8px;color:var(--dim);background:radial-gradient(60% 60% at 50% 40%,rgba(61,139,255,.12),transparent)}
.video-empty span{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;background:rgba(61,139,255,.15);color:var(--acc-2);font-size:1.25rem;padding-left:4px}
.theory{font-size:1.0625rem;line-height:1.7;color:#dcdce2}
.theory p{margin:0 0 14px}
.theory h2,.theory h3{margin:26px 0 10px}
.theory ul,.theory ol{padding-left:22px;margin:0 0 14px}
.theory img{max-width:100%;border-radius:12px}
.theory .katex-display{margin:18px 0;overflow-x:auto;overflow-y:hidden}

.quiz{margin-top:34px;padding-top:26px;border-top:1px solid var(--line)}
.quiz h2{font-size:1.375rem;margin-bottom:18px}
.question{border:1px solid var(--line);border-radius:18px;padding:18px 20px;margin:0 0 14px;background:#101013;min-width:0}
.question legend{padding:0 8px;font-weight:600;font-size:1rem}
.q-num{color:var(--acc-2)}
.option{display:flex;align-items:center;gap:12px;padding:11px 14px;margin-top:8px;border-radius:12px;border:1px solid var(--line);cursor:pointer;transition:border-color .2s,background .2s}
.option:hover{border-color:#3a3a44;background:#15151a}
.option input{accent-color:var(--acc);width:18px;height:18px;flex:none}
.question.is-correct{border-color:rgba(76,214,138,.5)}
.question.is-wrong{border-color:rgba(255,123,123,.5)}
.option.is-right{border-color:rgba(76,214,138,.6);background:rgba(76,214,138,.08)}
.option.is-mistake{border-color:rgba(255,123,123,.6);background:rgba(255,123,123,.08)}
.option input:disabled,.quiz.is-answered .option{cursor:default}
.option-mark{margin-left:auto;font-style:normal;font-size:0.8125rem;color:var(--dim);white-space:nowrap}
.q-explain{margin-top:12px;padding:12px 14px;border-radius:12px;background:#15151a;color:#c9c9d1;font-size:0.9375rem}
.quiz-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:18px}
.quiz-result{font-weight:600}.quiz-result.ok{color:var(--ok)}.quiz-result.bad{color:var(--danger)}
.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:34px}
.lesson-error{padding:28px;border:1px dashed var(--line);border-radius:18px;color:var(--dim)}

@media(max-width:900px){
  .course{grid-template-columns:1fr;gap:18px}
  .course-side{position:static;max-height:none}
  .lesson{padding:22px 18px}
}

/* коды из писем, восстановление пароля, безопасность */
[hidden]{display:none!important}
.nowrap{white-space:nowrap}
.auth-sub.flush{text-align:left;margin-bottom:0}
.form-message{display:none;padding:12px 14px;border-radius:14px;background:rgba(255,123,123,.08);border:1px solid rgba(255,123,123,.25);color:var(--danger);font-size:0.875rem}
.form-message.visible{display:block}
.form-message.success,.step-two>.form-message:first-child{background:rgba(76,214,138,.08);border-color:rgba(76,214,138,.3);color:var(--ok)}
.forgot-link{justify-self:end;margin-top:-8px;color:var(--dim);font-size:0.875rem;text-decoration:underline;text-underline-offset:3px}
.forgot-link:hover{color:var(--text)}
.field input.code-input{text-align:center;font-size:1.625rem;font-weight:600;letter-spacing:.35em;font-variant-numeric:tabular-nums}
.resend-form{margin-top:12px}
.step-two{margin-top:22px;padding-top:22px;border-top:1px solid var(--line)}
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.settings-card{padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:20px;min-width:0}
.settings-card h3{font-size:1.125rem;margin-bottom:16px}
.settings-card .btn{justify-self:start}
.session-list{list-style:none;margin:0 0 16px;padding:0;display:grid;gap:8px}
.session-item{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:#101013}
.session-device{font-weight:600}
.session-current{margin-left:6px;padding:2px 8px;border-radius:999px;background:rgba(61,139,255,.15);color:var(--acc-2);font-size:0.75rem;font-weight:600}
.session-date{color:var(--dim);font-size:0.8125rem}
.sessions-card .form-message{margin-bottom:12px}
@media(max-width:720px){.settings-grid{grid-template-columns:1fr}}

/* тренажёр по номерам ЕГЭ */
.trainer-hero{padding:56px 0 8px}
.trainer-title{font-size:clamp(1.875rem,4.2vw,3rem);line-height:1.1;margin:0 0 14px}
.trainer-sub{max-width:640px;color:var(--dim);font-size:1.0625rem;margin-bottom:24px}
.trainer-body{padding:24px 0 64px}
.trainer-notice{margin-bottom:18px;padding:14px 18px;border-radius:16px;background:rgba(61,139,255,.1);border:1px solid rgba(61,139,255,.3);color:#d4e3ff}
.trainer-notice a,.trainer-hint a{color:var(--acc-2);text-decoration:underline;text-underline-offset:3px}
.trainer-hint{margin-top:20px;font-size:0.875rem}
.num-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.num-card{display:flex;flex-direction:column;gap:8px;padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:22px;transition:border-color .25s,transform .25s var(--ease),box-shadow .25s}
.num-card.is-open:hover,.num-card.is-open:focus-visible{border-color:var(--acc-2);transform:translateY(-3px);box-shadow:0 18px 40px -22px rgba(61,139,255,.5);outline:0}
.num-card.is-open:hover .num-title{color:var(--acc-2)}
/* недоступные номера: приглушены фон и значок, текст остаётся читаемым */
.num-card.is-locked,.num-card.is-soon{background:transparent;border-style:dashed}
.num-card.is-locked .num-badge,.num-card.is-soon .num-badge{background:var(--soft);color:var(--dim)}
.num-card.is-soon .num-title{color:#c9c9d1}
.num-top{display:flex;justify-content:space-between;align-items:center}
.num-badge{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:rgba(61,139,255,.15);color:var(--acc-2);font-weight:700;font-size:1.0625rem}
.num-tag{padding:4px 10px;border-radius:999px;background:var(--soft);border:1px solid var(--line);color:var(--dim);font-size:0.75rem;font-weight:600}
.num-tag.is-free{background:rgba(76,214,138,.12);border-color:rgba(76,214,138,.3);color:var(--ok)}
.num-title{font-size:1.125rem;line-height:1.25;margin-top:6px}
.num-about{color:var(--dim);font-size:0.875rem}
.num-foot{margin-top:auto;padding-top:10px;display:grid;gap:8px}
.num-stats{font-size:0.8125rem;color:#c9c9d1}
.num-bar{display:block;height:5px;border-radius:99px;background:#22222a;overflow:hidden}
.num-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--acc),var(--acc-2))}

.trainer-run{max-width:860px;padding:28px 0 64px}
.trainer-run-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin:18px 0 20px}
.trainer-run-head h1{font-size:clamp(1.5rem,3.2vw,2.125rem)}
.trainer-run-stats{color:var(--dim);font-size:0.9375rem}
.trainer-run-stats b{color:var(--text)}
#task-view{transition:opacity .2s}
#task-view.loading{opacity:.45;pointer-events:none}
.task.is-correct{border-color:rgba(76,214,138,.5)}
.task.is-wrong{border-color:rgba(255,123,123,.45)}
.task-text{font-size:1.125rem}
.task-form{display:grid;gap:14px;margin-top:22px;padding-top:22px;border-top:1px solid var(--line)}
.task-field{max-width:320px}
.task-field input{font-size:1.25rem;font-variant-numeric:tabular-nums}
.task-actions{display:flex;gap:12px;flex-wrap:wrap}
.task-message{color:var(--danger);font-size:0.875rem;min-height:1.2em}
.task-result{margin-top:20px;display:grid;gap:14px;justify-items:start}
.task-verdict{font-weight:700;font-size:1.0625rem}
.task-verdict.ok{color:var(--ok)}.task-verdict.bad{color:var(--danger)}
.task-solution{width:100%;font-size:1rem;line-height:1.7}
.task-solution .katex-display,.task-text .katex-display{overflow-x:auto;overflow-y:hidden}
@media(max-width:600px){.task-field{max-width:none}.task-actions .btn{flex:1}}

/* мелкие подписи: небольшой положительный трекинг для читаемости */
.pill,.eyebrow,.eyebrow-left,.ticket-num,.num-tag,.session-current,.small,.stub-date,.session-date{letter-spacing:.01em}

/* на сенсорных экранах нет наведения: отклик — на нажатие, без «залипшего» подъёма */
@media(hover:none){
  .ticket-card:hover,.ticket-card.is-link:hover,.ticket-card.is-link:focus-within,.num-card.is-open:hover{transform:none;box-shadow:none}
  .ticket-card.is-link:active,.num-card.is-open:active{transform:scale(.98);transition:transform .1s ease-out}
}

/* уменьшение движения: вместо сдвигов и масштаба — короткое проявление */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:.01ms!important;scroll-behavior:auto!important}
  .btn:active,.ticket-card.is-link:active,.num-card.is-open:active{transform:none}
  .ticket-card:hover,.ticket-card.is-link:hover,.num-card.is-open:hover{transform:none}
  .product-modal[open]{animation:fade-in .15s linear}
  .product-modal.is-closing{animation:fade-out .15s linear forwards}
  .nav-links,.nav-links.open{transform:none}
  .toast{animation:toast-fade 5s forwards}
  .btn.is-loading::before{animation-duration:2s}
}
@keyframes toast-fade{0%{opacity:0}8%,85%{opacity:1}100%{opacity:0;visibility:hidden}}

/* меньше прозрачности и больше контраста — по системным настройкам */
@media(prefers-reduced-transparency:reduce){
  .site-nav{background:var(--bg);backdrop-filter:none}
  .product-modal::backdrop{backdrop-filter:none;background:rgba(5,5,8,.9)}
}
@media(prefers-contrast:more){
  :root{--dim:#b4b4be;--line:#5a5a66}
  .site-nav{background:var(--bg);backdrop-filter:none}
}

/* подвал */
.site-footer{margin-top:3rem;padding:2.5rem 0 1.5rem;border-top:1px solid #17171b;color:var(--dim);font-size:.875rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
.footer-brand{margin-bottom:.75rem;color:var(--text)}
.footer-text{max-width:22rem;line-height:1.55}
.footer-head{color:var(--text);font-weight:600;margin-bottom:.75rem;letter-spacing:.01em}
.footer-list{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.footer-list a{transition:color .2s}
.footer-list a:hover{color:var(--text)}
.footer-legal{display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem 1.5rem;margin-top:2rem;padding-top:1.25rem;border-top:1px solid #17171b;font-size:.8125rem;letter-spacing:.01em}
@media(max-width:720px){.footer-grid{grid-template-columns:1fr;gap:1.5rem}}

/* юридические документы */
.legal{max-width:760px;padding:3rem 0 2rem}
.legal-title{font-size:clamp(1.75rem,3.6vw,2.5rem);line-height:1.12;letter-spacing:-.03em}
.legal-meta{color:var(--dim);margin:.5rem 0 2rem;font-size:.875rem}
.legal-body,.legal-seller{color:#d4d4d8;font-size:1rem;line-height:1.7}
.legal-body h2,.legal-seller h2{font-size:1.25rem;margin:2rem 0 .75rem;color:var(--text)}
.legal-body p{margin:0 0 .75rem}
.legal-body ul{margin:0 0 .75rem;padding-left:1.25rem}
.legal-body li{margin-bottom:.25rem}
.legal a{color:var(--acc-2);text-decoration:underline;text-underline-offset:3px}
.legal-seller{margin-top:2.5rem;padding:1.25rem 1.5rem;border:1px solid var(--line);border-radius:18px;background:var(--panel)}
.legal-seller h2{margin-top:0}

/* регистрация: согласие и ссылки на документы */
.check{display:flex;gap:.75rem;align-items:flex-start;font-size:.875rem;line-height:1.45;color:#c9c9d1;cursor:pointer}
.check input{flex:none;width:1.125rem;height:1.125rem;margin-top:.125rem;accent-color:var(--acc)}
.check a{color:var(--text);text-decoration:underline;text-underline-offset:3px}
.check input.input-error{outline:2px solid var(--danger);outline-offset:2px}
.auth-legal{display:flex;justify-content:center;flex-wrap:wrap;gap:.25rem 1rem;margin-top:1.5rem;font-size:.8125rem;color:var(--dim)}
.auth-legal a{transition:color .2s}
.auth-legal a:hover{color:var(--text)}
.pm-note{margin-top:.75rem;color:var(--dim);font-size:.8125rem;text-align:center}
.pm-note a{color:var(--text);text-decoration:underline;text-underline-offset:3px}

/* страница результата оплаты */
.payment-page{display:flex;justify-content:center;padding:4rem 0}
.payment-card{width:min(520px,100%);padding:2.5rem 2rem;text-align:center;background:var(--panel);border:1px solid var(--line);border-radius:28px}
.payment-title{font-size:clamp(1.5rem,3vw,2rem);letter-spacing:-.025em;margin-bottom:.75rem}
.payment-actions{margin-top:1.75rem;display:flex;justify-content:center}
.payment-icon{width:4rem;height:4rem;margin:0 auto 1.25rem;border-radius:50%;display:grid;place-items:center;font-size:1.75rem;font-weight:700}
.payment-icon.ok{background:rgba(76,214,138,.14);color:var(--ok)}
.payment-icon.bad{background:rgba(255,123,123,.12);color:var(--danger)}
.payment-icon.wait{background:rgba(61,139,255,.12)}
.payment-spinner{width:1.75rem;height:1.75rem;border-radius:50%;border:3px solid rgba(127,176,255,.3);border-top-color:var(--acc-2);animation:spin .9s linear infinite}
@media(prefers-reduced-motion:reduce){.payment-spinner{animation-duration:2.5s}}