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(min-width:768px){.md\:flex{display:flex}.md\:hidden{display:none}.md\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.md\:py-16{padding-top:4rem;padding-bottom:4rem}.md\:py-24{padding-top:6rem;padding-bottom:6rem}}
.site-header{background:#fff;border-bottom:1px solid rgba(148,163,184,.25);box-shadow:0 6px 24px rgba(15,23,42,.05);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);}
.dark .site-header{background:#0b1120;border-bottom:1px solid rgba(148,163,184,.35);box-shadow:0 10px 32px rgba(0,0,0,.45);}
.topnav{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.whoami{font-size:.9rem;color:#4b5563;display:flex;align-items:center;gap:8px;white-space:nowrap}
.whoami>span:only-child{display:none}
.whoami:is(.dark *){color:#e5e7eb}
.page-container{max-width:1120px;margin:0 auto;padding:0 1.25rem}
@media (min-width:768px){.page-container{padding:0 2rem}}
@media (min-width:1280px){.page-container{padding:0 2.5rem}}
body{line-height:1.6;color:#0f172a}
main p{color:#0f172a}
h1,h2,h3{margin-bottom:.75rem;color:inherit}
.site-header{position:sticky;top:0;z-index:40}
.topnav{gap:14px}
.topnav a{color:inherit;text-decoration:none;padding:8px 0}
.topnav a:hover{text-decoration:underline}
.whoami{gap:10px;flex-wrap:nowrap}
.card:is(.dark *),.panel:is(.dark *),.panel-dark:is(.dark *){background:#020b22;border-color:rgba(148,163,184,.35)}
body:is(.dark *){background:#020617;color:#e5e7eb}
main p:is(.dark *){color:#cbd5e1}
.topnav a:is(.dark *){color:#e5e7eb}
.task-statement p{margin-bottom:.5rem}
.task-statement{line-height:1.7;font-size:1.05rem}
.task-statement .katex-display{margin:1rem 0;padding:0.75rem;border-radius:0.75rem;background:rgba(148,163,184,.12)}
:root{
  --color-bg:#020617;
  --color-surface:#0B1120;
  --color-surface-alt:#111827;
  --color-border-subtle:#1F2937;
  --color-text-main:#E5E7EB;
  --color-text-muted:#9CA3AF;
  --color-primary:#3B82F6;
  /* hierarchy accents */
  --color-subject:#3B82F6; /* blue */
  --color-subject-soft:#2563EB;
  --color-grade:#22D3EE; /* cyan/blue */
  --color-grade-soft:#0EA5E9;
  --color-topic:#A855F7; /* violet */
  --color-topic-soft:#7C3AED;
  --color-task:#8B5CF6; /* deeper purple */
  --color-task-soft:#7C3AED;
  --color-instance:#10B981; /* teal/greenish */
  --color-instance-accent:#22C55E;
}
.dark body,body.dark,.theme-dark body{background-color:var(--color-bg);color:var(--color-text-main)}
.surface-card{background:var(--color-surface);border:1px solid var(--color-border-subtle);color:var(--color-text-main);box-shadow:0 10px 30px rgba(0,0,0,.35)}
.surface-alt{background:var(--color-surface-alt);border:1px solid var(--color-border-subtle);color:var(--color-text-main)}
.helper-text{margin-top:0.2rem;font-size:.82rem;color:var(--color-text-muted)}
.muted-id{color:var(--color-text-muted);font-size:.8rem;letter-spacing:.01em}
.entity-badge{display:inline-flex;align-items:center;gap:6px;padding:.2rem .65rem;border-radius:9999px;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--color-border-subtle);background:rgba(255,255,255,.04)}
.entity-badge--subject{color:var(--color-subject);border-color:var(--color-subject-soft);background:rgba(59,130,246,.12)}
.entity-badge--grade{color:var(--color-grade);border-color:var(--color-grade-soft);background:rgba(34,211,238,.12)}
.entity-badge--topic{color:var(--color-topic);border-color:var(--color-topic-soft);background:rgba(168,85,247,.12)}
.entity-badge--task{color:var(--color-task);border-color:var(--color-task-soft);background:rgba(139,92,246,.12)}
.entity-badge--instance{color:var(--color-instance);border-color:var(--color-instance-accent);background:rgba(16,185,129,.12)}
.entity-dot{width:.55rem;height:.55rem;border-radius:9999px;display:inline-block;background:var(--color-text-muted);box-shadow:0 0 0 1px var(--color-border-subtle)}
.entity-dot--subject{background:var(--color-subject);box-shadow:0 0 0 1px var(--color-subject-soft)}
.entity-dot--grade{background:var(--color-grade);box-shadow:0 0 0 1px var(--color-grade-soft)}
.entity-dot--topic{background:var(--color-topic);box-shadow:0 0 0 1px var(--color-topic-soft)}
.entity-dot--task{background:var(--color-task);box-shadow:0 0 0 1px var(--color-task-soft)}
.entity-dot--instance{background:var(--color-instance);box-shadow:0 0 0 1px var(--color-instance-accent)}
.card-header-line{border-left:3px solid var(--color-border-subtle);padding-left:1rem}
.card-header-line--subject{border-color:var(--color-subject)}
.card-header-line--grade{border-color:var(--color-grade)}
.card-header-line--topic{border-color:var(--color-topic)}
.card-header-line--task{border-color:var(--color-task)}
.card-header-line--instance{border-color:var(--color-instance)}
.text-entity-subject{color:var(--color-subject)}
.text-entity-topic{color:var(--color-topic)}
.text-entity-task{color:var(--color-task)}
.text-entity-instance{color:var(--color-instance)}
.entity-chip{display:inline-flex;align-items:center;gap:6px;padding:.2rem .65rem;border-radius:9999px;font-size:.8rem;border:1px solid rgba(59,130,246,.25);background:rgba(59,130,246,.12);color:var(--color-text-main)}
.entity-chip--grade{border-color:rgba(34,211,238,.35);background:rgba(34,211,238,.12)}
.entity-chip--topic{border-color:rgba(168,85,247,.25);background:rgba(168,85,247,.12)}
.entity-chip--task{border-color:rgba(139,92,246,.25);background:rgba(139,92,246,.12)}
.entity-chip--instance{border-color:rgba(16,185,129,.35);background:rgba(16,185,129,.14)}
.pill-muted{display:inline-flex;align-items:center;gap:6px;padding:.15rem .5rem;border-radius:9999px;font-size:.75rem;background:rgba(255,255,255,.04);color:var(--color-text-muted);border:1px solid var(--color-border-subtle)}
.input-prominent{border:1px solid var(--color-task-soft);background:rgba(124,58,237,.12);color:var(--color-text-main);box-shadow:0 0 0 1px rgba(168,85,247,.3)}
.crumb-line{color:var(--color-text-muted);font-size:.9rem;display:flex;align-items:center;gap:.35rem;flex-wrap:wrap}
.crumb-line .divider{color:rgba(148,163,184,.8)}
/* Solve page custom cards for dark theme */
.subject-card {
  background: #0b1120;
  border: 1px solid rgba(148,163,184,0.25);
  color: #e5e7eb;
  border-radius: 14px;
  padding: 14px 16px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.35);
}
.subject-card h3 { color: #e5e7eb; }
.subject-card .chip {
  background: rgba(255,255,255,0.06);
  color: #e5e7eb;
  border: 1px solid rgba(148,163,184,0.35);
  border-radius: 9999px;
  padding: 8px 12px;
  font-weight: 700;
  transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease;
}
.subject-card .chip:hover { transform: translateY(-1px); box-shadow: 0 6px 14px rgba(0,0,0,0.25); }

/* Dark header button for teachers */
/* Ensure readable text on yellow buttons/badges */
.bg-primary, .btn-primary, .text-black { color: #0f172a !important; }

.teacher-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #facc15;
  color: #0f172a !important;
  padding: 8px 14px;
  border-radius: 12px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 3px 12px rgba(0,0,0,0.18);
  transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease;
}
.teacher-link:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(0,0,0,0.24); opacity: 0.94; }
.teacher-link:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(0,0,0,0.14); }