:root {
  --color-ink: #2b2320;
  --color-paper: #faf6f0;
  --color-accent: #a9603f;
  --color-accent-dark: #8a4c31;
  --color-muted: #6b5f57;
  --color-border: #e2d6c8;
  --color-blue: #bcdcf7;
  --color-blue-dark: #7fb3e0;
  --color-gray-border: #9aa0a6;
}

* {
  box-sizing: border-box;
}

html, body {
  min-height: 100%;
  margin: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-weight: bold;
  background: var(--color-paper);
  color: var(--color-ink);
  display: flex;
  flex-direction: column;
}

header.site-header {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 32px 16px;
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
}

.logo {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-ink);
  margin: 0 0 14px;
}

.back-link {
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.95rem;
  margin-top: 10px;
}

.back-link:hover {
  text-decoration: underline;
}

.btn-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  letter-spacing: 0.02em;
  text-decoration: none;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

footer.site-footer {
  text-align: center;
  padding: 20px;
  font-size: 0.85rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}