@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f0f4f8;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #2d3748;
  --muted: #718096;
  --indigo: #5a67d8;
}

body {
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.topbar {
  min-height: 62px;
  padding: 0 24px;
  background: #ffffff;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.brand {
  color: var(--indigo);
  font-weight: 900;
  text-decoration: none;
}

.spacer { flex: 1; }

.topbar a:not(.brand) {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
}

.topbar a:hover { color: var(--indigo); }

.main {
  max-width: 900px;
  margin: 36px auto;
  padding: 0 22px 70px;
}

.document {
  background: var(--card);
  border-radius: 16px;
  padding: 34px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

h1 {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 8px;
}

h2 {
  font-size: 1.15rem;
  font-weight: 900;
  margin: 30px 0 10px;
}

h3 {
  font-size: 1rem;
  font-weight: 900;
  margin: 20px 0 6px;
}

p, ul { margin-top: 10px; }

ul { padding-left: 22px; }

a { color: var(--indigo); }

.hint {
  margin: 18px 0 26px;
  padding: 13px 16px;
  border-radius: 12px;
  background: #fffaf0;
  border: 2px solid #fbd38d;
  color: #744210;
  font-weight: 700;
}

.placeholder {
  color: #4a5568;
  font-weight: 800;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

@media (max-width: 640px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 14px 18px; gap: 8px; }
  .spacer { display: none; }
  .document { padding: 24px 20px; }
  h1 { font-size: 1.5rem; }
}