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

html,
body {
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: #ffffff;
  color: #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.container {
  max-width: 600px;
  width: 100%;
  text-align: center;
}

.content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.image-frame {
  margin-bottom: 12px;
  background-color: #ffffff;
  border: 3px solid #000000;
  padding: 8px;
  box-shadow: 8px 8px 0 0 #000000;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  max-width: 100%;
  width: fit-content;
}

.image-frame:hover {
  transform: translate(2px, 2px);
  box-shadow: 6px 6px 0 0 #000000;
}

.image-frame img {
  display: block;
  max-width: 100%;
  height: auto;
  max-height: 170px;
  border: 1px solid #000000;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid #000000;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.message {
  font-size: 1rem;
  line-height: 1.6;
  max-width: 480px;
}

.hint-code {
  display: block;
  margin-top: 16px;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.85rem;
  padding: 8px 12px;
  background-color: #f4f4f4;
  color: #000000;
  border-radius: 4px;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
}