* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
}

.page {
  width: min(720px, calc(100% - 32px));
  margin: 32px auto;
  display: grid;
  gap: 20px;
}

.card {
  background: #ffffff;
  border: 1px solid #dddddd;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

h1,
h2 {
  margin-top: 0;
}

.intro {
  margin-bottom: 20px;
  color: #555555;
}

.guestbook-form {
  display: grid;
  gap: 10px;
}

input,
textarea,
button {
  font: inherit;
}

input,
textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #bbbbbb;
  border-radius: 8px;
}

textarea {
  resize: vertical;
}

button {
  width: fit-content;
  padding: 12px 16px;
  border: none;
  border-radius: 8px;
  background: #1f6feb;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #1559c1;
}

button:disabled {
  opacity: 0.7;
  cursor: wait;
}

.status {
  min-height: 24px;
  margin: 0;
  color: #444444;
}

.entries {
  display: grid;
  gap: 12px;
}

.entry {
  border: 1px solid #e3e3e3;
  border-radius: 10px;
  padding: 14px;
  background: #fafafa;
}

.entry-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 8px;
}

.entry-name {
  font-weight: bold;
}

.entry-time {
  font-size: 0.9rem;
  color: #666666;
}

.entry-message {
  margin: 0;
  white-space: pre-wrap;
}

.empty-state {
  margin: 0;
  color: #666666;
}

@media (max-width: 600px) {
  .page {
    width: min(100% - 20px, 720px);
    margin: 20px auto;
  }

  .entry-header {
    flex-direction: column;
    align-items: flex-start;
  }
}