.shell{max-width:1280px;margin:0 auto;padding:32px 40px 80px;position:relative;z-index:2}

header.masthead{
  display:grid;grid-template-columns:auto 1fr auto;align-items:end;gap:40px;
  padding-bottom:20px;margin-bottom:28px;
  border-bottom:1px solid var(--ink);
  position:relative;
}
header.masthead::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:1px;background:var(--ink);
}

/* Компактная одноуровневая шапка: бренд | предметы | статус */
header.masthead.compact{
  grid-template-columns:auto 1fr auto;align-items:center;gap:24px;
  padding-bottom:16px;margin-bottom:22px;
}
header.masthead.compact::after{display:none}
.masthead-left{display:flex;flex-direction:column;gap:2px}
.masthead-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
.masthead.compact .brand{font-size:28px;line-height:1}
.masthead.compact .issue{
  font-size:10px;text-transform:uppercase;letter-spacing:.16em;
  color:var(--ink-mute);font-family:var(--f-mono);
  font-style:normal;text-align:left;margin-top:2px;
}
.masthead.compact .subject-switch{margin:0;justify-self:center}
.masthead.compact .streak-widget,
.masthead.compact .auth-badge{margin:0}
.masthead.compact .auth-badge{justify-content:flex-end}
.brand{
  font-family:var(--f-display);font-weight:600;font-size:42px;line-height:.9;
  letter-spacing:-0.02em;
  font-variation-settings: "opsz" 144;
}
.brand em{font-style:italic;color:var(--accent);font-weight:500}
.masthead .meta{
  font-family:var(--f-mono);font-size:11px;text-transform:uppercase;letter-spacing:.18em;
  color:var(--ink-mute);display:flex;gap:28px;align-items:center;justify-content:center;
}
.masthead .meta span b{color:var(--ink);font-weight:500}
.issue{
  font-family:var(--f-display);font-style:italic;font-weight:400;font-size:14px;
  color:var(--ink-mute);text-align:right;
}

.layout{display:grid;grid-template-columns:280px 1fr;gap:48px;align-items:start}

main.content{min-height:600px}

footer.colophon{
  margin-top:80px;padding-top:24px;border-top:1px solid var(--ink);
  display:grid;grid-template-columns:1fr auto;gap:20px;
  font-family:var(--f-mono);font-size:11px;text-transform:uppercase;
  letter-spacing:.14em;color:var(--ink-mute);
}

@media (max-width: 1100px){
  .task-row.part1{grid-template-columns:repeat(10, 1fr)}
  .tnum{font-size:18px}
}
@media (max-width: 900px){
  .shell{padding:20px 16px 60px}
  header.masthead{grid-template-columns:1fr;gap:12px}
  .issue{text-align:left}
  .task-row.part1{grid-template-columns:repeat(5, 1fr)}
  .task-row.part2{grid-template-columns:repeat(6, 1fr);max-width:none}
  .layout{grid-template-columns:1fr;gap:24px}
  aside.themes{position:static}
  .theme-title{font-size:32px}
  .task-body{padding:16px 18px 20px 18px}
  .task-head{padding:12px 16px}
  .variant-banner{grid-template-columns:1fr;gap:14px}
}