/* exxam.ru — общие стили сайта (лендинг + тренажёр + служебные страницы) */

:root{
  --bg:#fbefef; --card:#ffffff; --ink:#3a2f3f; --muted:#7c6d7a;
  --accent:#7d6396; --accent-2:#c5b3d3; --accent-soft:#f3ecf7;
  --rose:#f5cbcb; --rose-soft:#ffe2e2;
  --ok:#5c8f70; --ok-soft:#e9f4ec; --bad:#c96a6a; --bad-soft:#fbe9e9;
  --line:#f0d9dc; --line-strong:#e6cdd3; --amber:#9b5a6a; --amber-soft:#ffe2e2;
  --shadow:0 1px 2px rgba(58,47,63,.05), 0 14px 34px -16px rgba(58,47,63,.22);
  --shadow-sm:0 1px 2px rgba(58,47,63,.06);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);line-height:1.6;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{margin:0;letter-spacing:-.02em}
section{scroll-margin-top:80px}
p{margin:8px 0}
body::before{content:"";position:fixed;top:0;left:0;right:0;height:3px;z-index:100;
  background:linear-gradient(90deg,#c5b3d3,#f5cbcb,#7d6396)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid var(--line-strong);background:#fff;color:var(--ink);
  border-radius:12px;padding:10px 16px;font-size:14.5px;font-weight:650;
  cursor:pointer;font-family:inherit;transition:background .15s,border-color .15s,transform .1s,box-shadow .15s;
  white-space:nowrap}
.btn:hover{background:#fdf4f6;border-color:#e0c4cc}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 10px 22px -10px rgba(125,99,150,.7)}
.btn.primary:hover{background:#6b5282;border-color:#6b5282}
.btn.ghost{background:transparent;border-color:transparent;color:var(--accent);font-weight:700}
.btn.ghost:hover{background:var(--accent-soft)}
.btn.sm{padding:7px 12px;font-size:13.5px;border-radius:10px}
.btn.lg{padding:14px 24px;font-size:16px;border-radius:12px}
.btn.block{width:100%}

/* ---------- header ---------- */
header.top,header.app{position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line)}
header.top::before{content:"";display:block;height:3px;background:linear-gradient(90deg,#c5b3d3,#f5cbcb,#7d6396)}
.top-inner{display:flex;align-items:center;gap:22px;height:66px}
.app-inner{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.02em}
.brand .mark{width:34px;height:34px;border-radius:10px;flex:none;color:#fff;font-size:15px;font-weight:800;
  display:grid;place-items:center;background:linear-gradient(135deg,#7d6396,#a58bbd);
  box-shadow:0 6px 14px -6px rgba(125,99,150,.6)}
.top-actions{margin-left:auto;display:flex;align-items:center;gap:10px}
.app-actions{margin-left:auto;display:flex;align-items:center;gap:10px}
.crumbs{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted);font-weight:600}
.crumbs .dot{width:4px;height:4px;border-radius:50%;background:var(--line-strong)}
.crumbs b{color:var(--ink);font-weight:700}
.progress-chip{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:650;color:#5b4773;
  background:var(--accent-soft);border-radius:999px;padding:7px 13px}
nav.main{display:flex;gap:6px;margin-left:8px}
nav.main a{padding:8px 12px;border-radius:9px;font-size:14.5px;font-weight:550;color:#4a3f50}
nav.main a:hover{background:#f7eef2;color:var(--ink)}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;
  border-radius:11px;cursor:pointer;padding:0}
.burger span{display:block;width:18px;height:2px;background:var(--ink);margin:3px auto;border-radius:2px;transition:.2s}
.burger.open span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.mobile-menu{display:none;border-top:1px solid var(--line);background:#fff}
.mobile-menu a{display:block;padding:13px 20px;border-bottom:1px solid var(--line);font-weight:600}
.mobile-menu .btn{margin:14px 20px 18px;width:calc(100% - 40px)}

/* ---------- cards / chips ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);min-width:0}
.card .pad{padding:22px 24px}
.card h2{font-size:17px;margin-bottom:4px}
.sub,.muted{color:var(--muted);font-size:13.5px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:650;border-radius:999px;padding:5px 12px;
  background:var(--accent-soft);color:#5b4773}
.chip.rose{background:var(--rose-soft);color:#9b5a6a}
.chip.ok{background:var(--ok-soft);color:var(--ok)}
.chip.line{background:#fff;border:1px solid var(--line-strong);color:var(--muted)}
.chip.stage{background:var(--accent-soft);color:#5b4773}

/* ---------- content (условия, разборы) ---------- */
.ex{border-left:3px solid var(--line-strong);background:#fdf7f9;padding:12px 14px;margin:10px 0 0;border-radius:0 12px 12px 0;overflow-x:auto}
.ex p{margin:6px 0}
.ex.green{border-left-color:var(--ok)}
.figrow{display:flex;gap:14px;flex-wrap:wrap;margin:14px 0 4px}
.figrow figure{margin:0;flex:1 1 240px}
.figrow img{width:100%;border:1px solid var(--line-strong);border-radius:14px;background:#fff}
.figrow figcaption{font-size:12.5px;color:var(--muted);margin-top:7px;text-align:center}
.qbox{margin:16px 0 2px;padding:14px 16px;background:var(--accent-soft);border-left:4px solid var(--accent);border-radius:0 12px 12px 0}
.qbox .q{font-weight:800;color:var(--accent)}
.qbox p{margin:4px 0 0}
.cond-ex{margin:8px 0;padding:8px 12px;background:#faf0f4;border:1px dashed var(--line-strong);border-radius:8px;font-size:13.5px}
.cond-note{color:var(--muted);font-size:13px;margin:8px 0 0}
.fbox{margin:5px 0;padding:6px 12px;background:#f7eef2;border-radius:8px;width:max-content;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px}
.fbox .if{color:var(--muted);font-size:12.5px;font-family:inherit}
.kw{background:#f3ecf7;border:1px solid #d8c8e2;border-radius:5px;padding:0 4px;color:#5b4773;font-weight:700;white-space:nowrap}
code,.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em;background:#f7eef2;padding:1px 5px;border-radius:5px}
pre code{display:block;background:#2f2735;color:#efe0e7;padding:12px 14px;border-radius:12px;overflow-x:auto;line-height:1.5;font-size:13px}
.steps li{margin:5px 0}
.subconds{list-style:none;margin:4px 0 4px 14px;padding:0}
.subconds li{margin:3px 0}
.num{background:#fbe4e6;border:1px solid #e0c9de;color:#5b4773;border-radius:6px;padding:0 6px;font-weight:700;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;white-space:nowrap}
.num.big{font-size:1.05em;background:#f3ecf7;border-color:#d0bfdd;color:#5b4773}
.idea{margin:8px 0;padding:9px 12px;background:#fdeef0;border:1px solid #e0c9de;border-radius:10px;font-size:14px}
.crule{margin:6px 0 2px;padding:5px 12px;background:#f7eef2;border-radius:8px;width:max-content;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px}
.cchain{margin:8px 0 4px}
.cstep{padding:4px 12px;border-radius:8px;margin:3px 0;width:max-content;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;border:1px solid var(--line-strong);background:#fff}
.cstep.dn{border-left:4px solid var(--accent);background:#f7eef4}
.cstep.up{border-left:4px solid var(--ok);background:#eef6f0}
.cstep.base{border-left:4px solid var(--amber);background:#ffe2e2;font-weight:700}
.cnote{margin:6px 0;color:var(--muted);font-size:13px}
.tr{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.95em;
  background:#fdf7f9;border:1px dashed #e3d3ea;border-radius:8px;margin:4px 0 0;padding:3px 10px}
table.mini{border-collapse:collapse;font-size:14px;margin:6px 0}
table.mini td,table.mini th{border:1px solid var(--line-strong);padding:4px 10px;text-align:left}
table.mini tr.ok td{background:var(--ok-soft);font-weight:700}
.thitem{margin:12px 0;padding:0 0 4px 14px;border-left:3px solid var(--accent)}
.thitem .thhead{font-weight:700;color:var(--ink);margin-bottom:7px;font-size:15px}
.thitem .thhead b{color:var(--accent)}
.thitem .thbody{color:#3a2f3f}
.thbody a,.step .body a,.idea a,.ex a{color:var(--accent);text-decoration:underline;font-weight:600}
.thbody a:hover,.step .body a:hover,.idea a:hover,.ex a:hover{color:#6b5282}
.diffbox{margin:12px 0 0;padding:9px 12px;background:var(--accent-soft);border-left:3px solid #8f76a8;border-radius:0 10px 10px 0;font-size:13px;color:#5b4773}
.proto{margin:12px 0 0;border:1px dashed var(--line-strong);background:#fdf1f2;border-radius:10px;padding:9px 14px;font-size:13px;color:var(--amber)}
.andcols + .legend{font-size:12px;color:var(--muted);margin-top:2px}
.andcols + .legend span{display:inline-block;width:10px;height:10px;border-radius:2px;margin:0 3px 0 8px;vertical-align:-1px}

/* ---------- footer ---------- */
footer.app{border-top:1px solid var(--line);background:#fff}
footer.app .container{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;padding:20px;font-size:13px;color:var(--muted)}

/* ================= LANDING ================= */
.hero{position:relative;overflow:hidden;
  background:
    radial-gradient(1100px 460px at 12% -10%, rgba(197,179,211,.5) 0%, rgba(197,179,211,0) 60%),
    radial-gradient(900px 420px at 100% 0%, rgba(245,203,203,.55) 0%, rgba(245,203,203,0) 55%),
    var(--bg);
  padding:64px 0 56px}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:6px 13px}
.hero h1{font-size:clamp(30px,4.4vw,52px);line-height:1.08;letter-spacing:-.03em;margin:18px 0 16px;font-weight:820}
.hero h1 .grad{background:linear-gradient(120deg,#6f5589,#8a6fa3);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,1.5vw,19px);color:#574b5c;max-width:560px;margin:0 0 26px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.hero .chips{margin-top:26px}
.hero .chip{color:#4a3f50;background:#fff;border:1px solid var(--line);padding:7px 13px;font-size:13px}
.hero .chip svg{width:15px;height:15px;color:var(--ok);flex:none}
.mock{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);transform:rotate(.4deg)}
.mock-bar{display:flex;align-items:center;gap:8px;padding:11px 14px;background:#fdf4f5;border-bottom:1px solid var(--line)}
.mock-bar i{width:11px;height:11px;border-radius:50%;background:#f2e3e8;display:block}
.mock-bar i:nth-child(1){background:#ff5f57}.mock-bar i:nth-child(2){background:#febc2e}.mock-bar i:nth-child(3){background:#28c840}
.mock-url{margin-left:8px;flex:1;background:#fff;border:1px solid var(--line);border-radius:8px;padding:5px 11px;font-size:12.5px;color:var(--muted)}
.mock-body{padding:18px}
.mock-tag{display:inline-block;font-size:11.5px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:7px;padding:4px 9px}
.mock h4{margin:11px 0 10px;font-size:15px}
.mock img{border:1px solid var(--line);border-radius:10px;background:#fff}
.mock-ans{display:flex;gap:8px;margin-top:12px}
.mock-ans .fake-input{flex:1;border:1px solid var(--line);border-radius:9px;padding:9px 12px;color:#b3a6b8;font-family:ui-monospace,Menlo,monospace;font-size:14px}
.mock-ok{margin-top:12px;background:var(--ok-soft);color:var(--ok);border-radius:9px;padding:8px 12px;font-size:13.5px;font-weight:650;display:flex;align-items:center;gap:8px}
.stats{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:26px 0}
.stats .stat b{display:block;font-size:clamp(22px,2.6vw,30px);letter-spacing:-.02em;line-height:1.1}
.stats .stat span{font-size:13.5px;color:var(--muted)}
.section{padding:72px 0}
.section.tight{padding:56px 0}
.sec-head{text-align:center;max-width:680px;margin:0 auto 42px}
.sec-head h2{font-size:clamp(24px,3vw,34px);letter-spacing:-.025em;margin:0 0 12px;font-weight:800}
.sec-head p{color:var(--muted);font-size:16px;margin:0}
.subjects-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.subject{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  display:flex;flex-direction:column;gap:12px;transition:transform .15s,box-shadow .15s,border-color .15s}
.subject.ready{border-color:#e3d3ea;box-shadow:0 16px 34px -20px rgba(125,99,150,.4)}
.subject:not(.soon):hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.subject .ic{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent)}
.subject .ic svg{width:24px;height:24px}
.subject h3{margin:2px 0 0;font-size:17px;letter-spacing:-.01em}
.subject .meta{font-size:13.5px;color:var(--muted);margin-top:-4px}
.subject .foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:6px}
.badge{font-size:12px;font-weight:700;border-radius:999px;padding:4px 11px}
.badge.ok{background:var(--ok-soft);color:var(--ok)}
.badge.soon{background:#f7eef2;color:var(--muted)}
.subject.soon{opacity:.72}
.subject.soon .ic{background:#f7eef2;color:#b0a4b3}
.subject .go{font-size:14px;font-weight:700;color:var(--accent)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:transform .15s,box-shadow .15s}
.feature:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.feature .ic{width:44px;height:44px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;margin-bottom:14px}
.feature .ic svg{width:23px;height:23px}
.feature h3{margin:0 0 8px;font-size:16.5px}
.feature p{margin:0;color:var(--muted);font-size:14.5px}
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step3{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px 24px}
.step3 .num{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;display:grid;place-items:center;font-weight:800;font-size:17px;margin-bottom:14px;font-family:inherit}
.step3 h3{margin:0 0 8px;font-size:16.5px}
.step3 p{margin:0;color:var(--muted);font-size:14.5px}
.demo-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.demo-shot{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.demo-shot img{border:1px solid var(--line);border-radius:10px}
.demo-shot .cap{font-size:12.5px;color:var(--muted);text-align:center;margin-top:8px}
.demo-list{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:12px}
.demo-list li{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:#4a3f50}
.demo-list .tick{width:24px;height:24px;flex:none;border-radius:8px;background:var(--ok-soft);color:var(--ok);display:grid;place-items:center}
.demo-list .tick svg{width:15px;height:15px}
.tasks{margin-top:34px}
.tasks-title{font-size:14px;font-weight:700;color:var(--muted);margin:0 0 12px;text-align:center}
.task-grid{display:grid;grid-template-columns:repeat(9,1fr);gap:8px;max-width:760px;margin:0 auto}
.task{aspect-ratio:1/1;border-radius:10px;display:grid;place-items:center;font-weight:700;font-size:14px;
  background:#f7eef2;color:#b0a4b3;border:1px solid transparent}
.task.ready{background:#fff;border-color:#e3d3ea;color:var(--accent);transition:.15s}
.task.ready:hover{background:var(--accent);border-color:var(--accent);color:#fff;transform:translateY(-2px)}
.faq{max-width:800px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:13px;margin-bottom:10px;overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:17px 20px;font-weight:650;font-size:15.5px;display:flex;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"";width:9px;height:9px;border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg);transition:.2s;flex:none}
.faq details[open] summary::before{transform:rotate(45deg)}
.faq .body{padding:0 20px 18px 41px;color:var(--muted);font-size:14.5px}
.cta-band{background:linear-gradient(120deg,#c5b3d3,#f5cbcb);border-radius:24px;padding:52px 40px;text-align:center;color:#3a2f3f;
  box-shadow:0 30px 60px -30px rgba(125,99,150,.6)}
.cta-band h2{font-size:clamp(24px,3vw,34px);margin:0 0 12px;letter-spacing:-.02em}
.cta-band p{margin:0 0 26px;opacity:.92;font-size:16px}
.cta-band .btn{background:#3a2f3f;border-color:#3a2f3f;color:#fff}
.cta-band .btn:hover{background:#4d4054;border-color:#4d4054}
footer.site{background:#3a2f3f;color:#e8dfe6;padding:52px 0 30px;margin-top:72px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:34px}
footer.site .brand{color:#fff}
footer.site .brand .mark{box-shadow:none}
footer.site p{font-size:13.5px;color:#b3a6b8;margin:14px 0 0;max-width:360px}
footer.site h4{font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:#b3a6b8;margin:0 0 14px}
footer.site ul{list-style:none;padding:0;margin:0;display:grid;gap:9px}
footer.site ul a{font-size:14.5px;color:#e8dfe6}
footer.site ul a:hover{color:#fff}
.foot-bottom{border-top:1px solid #4d4054;margin-top:38px;padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#b3a6b8}

/* ================= TRAINER ================= */
.taskbar{border-top:1px solid var(--line);background:#fff}
.taskbar-inner{display:flex;align-items:center;gap:12px;padding:10px 0}
.taskbar .lbl{font-size:12.5px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;flex:none}
.pills{display:flex;gap:6px;overflow-x:auto;padding:3px 2px;scrollbar-width:thin}
.pills::-webkit-scrollbar{height:6px}
.pills::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:99px}
.pill{flex:none;min-width:36px;height:36px;padding:0 10px;border-radius:10px;border:1px solid var(--line-strong);
  background:#fff;color:var(--ink);font-weight:700;font-size:14px;cursor:pointer;font-family:inherit;
  display:inline-flex;align-items:center;justify-content:center;transition:.15s}
.pill:hover{background:var(--accent-soft);border-color:var(--accent-2)}
.pill.on{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 8px 16px -8px rgba(125,99,150,.8)}
.pill.off{background:#f7eef2;border-color:var(--line);color:#c3b4bd;cursor:not-allowed}
.pill.off:hover{background:#f7eef2}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:22px;align-items:start;padding-top:24px;padding-bottom:60px}
.stack{display:grid;gap:18px;min-width:0}
.task-head{background:linear-gradient(135deg,#fff,#fdf5f8);border-color:var(--line-strong)}
.task-head .row{display:flex;align-items:flex-start;gap:16px;justify-content:space-between;flex-wrap:wrap}
.task-head h1{font-size:clamp(20px,2.6vw,26px);margin:10px 0 6px}
.task-head .theme{color:var(--muted);font-size:14.5px;max-width:640px}
.big-badge{width:54px;height:54px;border-radius:15px;flex:none;display:grid;place-items:center;
  background:linear-gradient(135deg,#7d6396,#c5b3d3);color:#fff;font-weight:800;font-size:20px;box-shadow:0 12px 24px -12px rgba(125,99,150,.8)}
.biletbar{display:flex;align-items:center;gap:10px;justify-content:space-between;background:var(--accent-soft);border-radius:12px;padding:9px 13px;margin:0 0 14px;flex-wrap:wrap}
.biletbar .grp{display:flex;align-items:center;gap:8px}
.navbtn{min-width:36px;height:36px;padding:0;border:1px solid var(--line-strong);background:#fff;border-radius:10px;font-weight:800;font-size:16px;color:var(--accent);cursor:pointer}
.navbtn:hover{background:var(--accent-soft)}
.sol-head{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:6px}
.sol-sub{font-size:15px;font-weight:800;margin:22px 0 10px;display:flex;align-items:center;gap:9px}
.sol-sub::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--accent);flex:none}
.sol-sub-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:22px 0 10px;flex-wrap:wrap}
.sol-sub-row .sol-sub{margin:0}
.bar{height:9px;border-radius:99px;background:#f2e3e9;overflow:hidden;margin:4px 0 16px}
.bar>i{display:block;height:100%;width:0;background:linear-gradient(90deg,#7d6396,#c5b3d3);border-radius:99px;transition:width .3s}
.steps{display:grid;gap:10px}
.step{border:1px solid var(--line-strong);border-radius:14px;overflow:hidden;background:#fff}
.step.mstep{border-color:var(--accent-2);background:#fdf8fb}
.step .h{display:flex;align-items:center;gap:12px;padding:13px 16px;cursor:pointer;user-select:none}
.step .h .n{width:26px;height:26px;border-radius:50%;flex:none;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);font-weight:800;font-size:13px}
.step.open .h .n{background:var(--accent);color:#fff}
.step .h .tt{flex:1;font-weight:700;font-size:14.5px}
.step .h .chev{width:18px;height:18px;color:var(--muted);transition:transform .2s;flex:none}
.step.open .h .chev{transform:rotate(180deg)}
.step .body{display:none;padding:0 16px 16px 54px;border-top:1px solid var(--line);margin-top:-1px;padding-top:14px;font-size:14.5px;color:#4a3f50}
.step.open .body{display:block}
.acc{margin-top:16px;display:grid;gap:10px}
.acc details{border:1px solid var(--line-strong);border-radius:14px;background:#fff;overflow:hidden}
.acc summary{list-style:none;cursor:pointer;padding:14px 16px;font-weight:700;font-size:14.5px;display:flex;align-items:center;gap:11px}
.acc summary::-webkit-details-marker{display:none}
.acc summary::before{content:"";width:9px;height:9px;border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg);transition:.2s;flex:none}
.acc details[open] summary::before{transform:rotate(45deg)}
.acc .body{padding:0 16px 16px 36px;color:var(--muted);font-size:14px}
.acc .body ul{margin:0;padding-left:18px}
.acc .body li{margin:5px 0}
.theory summary{background:var(--ink);color:#fff}
.theory summary::before{border-color:#fff}
.theory[open] summary{border-bottom:1px solid var(--line)}
.theory .body{color:#4a3f50}
.andcols{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;cursor:zoom-in}
.oct{flex:1 1 160px;border:1px solid var(--line-strong);border-radius:12px;padding:9px 11px;background:#fff;min-width:158px}
.oct.hot{outline:2px solid var(--accent);background:#fdf4f6}
.oct .olab{font-size:11px;color:var(--muted);margin-bottom:5px;font-family:inherit}
.oct .olab b{color:var(--accent)}
.oct .bl{display:flex;align-items:center;gap:6px;padding:2px 0;white-space:nowrap}
.oct .bl i{font-style:normal;font-size:10px;color:var(--muted);width:30px;flex:none;font-family:inherit}
.oct .cells{display:inline-flex;gap:1px;flex:none}
.oct .cells span{width:9px;height:16px;display:inline-flex;align-items:center;justify-content:center;font-size:9px;border-radius:2px}
.oct .c1{background:#f3ecf7;color:#5b4773}
.oct .cm{background:#f3e8ee;color:#574b5c}
.oct .crg{background:#cfe6d8;color:#3d5c4a;font-weight:700}
.oct .crr{background:#f0cccc;color:#7a3f3f;font-weight:700}
.oct .dec{margin-left:auto;font-size:10px;color:var(--muted);font-family:inherit;flex:none;min-width:22px;text-align:left}
.oct .dec.res{color:var(--accent);font-weight:700;font-size:11px;min-width:26px}
.oct .arrow{font-size:10px;color:var(--accent);margin-top:5px;border-top:1px dashed #e3d3ea;padding-top:4px;line-height:1.3}
.andwrap{position:relative}
.zoombtn{position:absolute;top:6px;right:6px;z-index:3;background:#fff;border:1px solid var(--line-strong);color:var(--accent);
  font-weight:800;border-radius:8px;padding:2px 9px;font-size:12px;opacity:.8;box-shadow:0 1px 3px rgba(0,0,0,.12);cursor:pointer}
.zoombtn:hover{opacity:1;background:var(--accent);color:#fff}
.andmodal{position:fixed;inset:0;z-index:60;display:flex;align-items:flex-start;justify-content:center;padding:28px 20px;background:rgba(47,39,53,.6)}
.andmodal[hidden]{display:none}
.andmodal-box{position:relative;background:#fff;border-radius:16px;padding:16px 20px 20px;max-width:min(1150px,96vw);max-height:90vh;overflow:auto;box-shadow:0 12px 44px rgba(0,0,0,.45)}
.andscale{display:inline-block;vertical-align:top;line-height:0;font-size:0}
.andscale > .andcols{transform-origin:0 0}
.mhead{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:6px;position:sticky;top:0;background:#fff;z-index:2;padding-bottom:8px}
.mhead b{font-size:15px}
.binmask{margin:8px 0;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.bmr{display:flex;align-items:center;gap:10px;padding:3px 0;white-space:nowrap;flex-wrap:wrap}
.bmv{min-width:52px;font-weight:700;color:var(--accent);text-align:right}
.bma{color:var(--muted)}
.bmn{color:var(--muted);font-size:11px}
.binmask .cells{display:inline-flex;gap:1px;flex:none}
.binmask .cells span{width:11px;height:18px;display:inline-flex;align-items:center;justify-content:center;font-size:11px;border-radius:2px}
.binmask .c1{background:#f3ecf7;color:#5b4773;font-weight:700}
.binmask .cm{background:#f3e8ee;color:#574b5c}
.bmsum{margin-top:6px;padding:8px 10px;background:var(--accent-soft);border-radius:10px;font-size:13px;font-family:inherit}
.fstep{border:1px solid var(--line-strong);border-radius:14px;margin:8px 0;background:#fff;overflow:hidden}
.fstep.mstep{background:#fdf8fb;border-color:var(--accent-2)}
.fstep .fh{display:flex;gap:10px;align-items:center;padding:11px 14px}
.fstep .fh .n{background:var(--accent);color:#fff;border-radius:50%;min-width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;font-size:12px;flex:none}
.fstep .fh .tt{flex:1;color:var(--ink);font-weight:700}
.fstep .body{padding:0 16px 14px;border-top:1px solid var(--line);padding-top:12px}
.side{position:sticky;top:140px;display:grid;gap:18px}
.answer-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.answer .field{display:flex;gap:8px;margin-top:14px}
.answer input{flex:1;min-width:0;border:1px solid var(--line-strong);border-radius:12px;padding:12px 14px;font-size:16px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#fff;color:var(--ink);transition:.15s}
.answer input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(197,179,211,.4)}
.feedback{display:none;margin-top:14px;padding:12px 14px;border-radius:12px;font-weight:650;font-size:14px;align-items:flex-start;gap:9px}
.feedback.show{display:flex}
.feedback.ok{background:var(--ok-soft);color:var(--ok)}
.feedback.bad{background:var(--bad-soft);color:var(--bad)}
.feedback.warn{background:var(--rose-soft);color:var(--amber)}
.feedback svg{width:17px;height:17px;flex:none;margin-top:2px}
.attempts{font-size:12.5px;color:var(--muted)}
.stat{display:flex;align-items:baseline;gap:8px;margin-top:10px}
.stat b{font-size:30px;letter-spacing:-.03em}
.stat span{color:var(--muted);font-size:13.5px}
.mini{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.mini .m{background:#fdf4f6;border:1px solid var(--line);border-radius:12px;padding:11px 12px}
.mini .m b{display:block;font-size:18px}
.mini .m span{font-size:12px;color:var(--muted)}
.answer .btn.block{margin-top:10px}

/* ---------- responsive ---------- */
@media (max-width:960px){
  nav.main{display:none}
  .burger{display:block}
  .top-actions .btn{display:none}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .mock{transform:none;max-width:520px}
  .subjects-grid,.features-grid,.steps3{grid-template-columns:repeat(2,1fr)}
  .demo-grid{grid-template-columns:1fr;gap:28px}
  .task-grid{grid-template-columns:repeat(7,1fr)}
}
@media (max-width:900px){
  .layout{grid-template-columns:1fr}
  .side{position:static}
  .crumbs{display:none}
}
@media (max-width:640px){
  .container{padding:0 12px}
  .card .pad{padding:16px}
  .step .body{padding-left:16px}
  .app-inner{height:58px}
  .progress-chip{display:none}
  .task-head h1{font-size:20px}
  .ex,.fbox,.crule,.tr,.cond-ex,.binmask{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
  pre code{font-size:12px}
  .oct{flex:1 1 100%;min-width:0}
  .thitem .thhead{font-size:14px}
  .andmodal-box{padding:10px 10px 14px;max-width:97vw}
  .mhead b{font-size:13px}
  .num{white-space:normal}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:22px 12px}
  .subjects-grid,.features-grid,.steps3{grid-template-columns:1fr}
  .section{padding:54px 0}
  .hero{padding:44px 0 40px}
  .cta-band{padding:40px 22px;border-radius:18px}
  .task-grid{grid-template-columns:repeat(5,1fr)}
  .foot-grid{grid-template-columns:1fr;gap:26px}
}
@media (max-width:380px){
  .oct{padding:8px 10px}
  .step .h .n{min-width:22px;height:22px;font-size:11px}
}