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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #ffffff;
  padding: 40px 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.block {
  width: 100%;
  max-width: 500px;
  border-radius: 16px;
  padding: 32px;
  transition: background 0.3s, color 0.3s;
  background: #ffffff;
  color: #1a1a1a;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.block-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  text-align: center;
}

.block-logo {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto 20px;
  max-height: 160px;
  object-fit: contain;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: inherit;
  text-decoration: none;
  font-size: 14px;
  opacity: 0.6;
  align-self: flex-start;
}

.back-link:hover {
  opacity: 1;
}

.block-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 20px;
}

.block-links li {
  font-size: 14px;
}

.block-links .label {
  display: inline-block;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.3px;
  transition: opacity 0.2s;
}

.block-links .label:hover {
  opacity: 0.65;
}

.theme-light .block-links .label {
  color: #1a1a1a;
  background: rgba(0,0,0,0.06);
}

.theme-dark .block-links .label {
  color: #f0f0f0;
  background: rgba(255,255,255,0.1);
}

.theme-color .block-links .label {
  color: #fff;
  background: rgba(255,255,255,0.2);
}

.nav-btn {
  display: block;
  width: 280px;
  padding: 14px 0;
  border-radius: 12px;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  color: #1a1a1a;
  background: transparent;
  border: 2px solid #1a1a1a;
  transition: background 0.2s, color 0.2s;
  text-align: center;
}

.nav-btn:hover {
  background: #1a1a1a;
  color: #fff;
}

.block.theme-light {
  background: #F0F0F5;
  color: #1a1a1a;
}

.block.theme-dark {
  background: #24252E;
  color: #f0f0f0;
}

.block.theme-color {
  background: linear-gradient(135deg, #919BFF, #133A94);
  color: #ffffff;
}