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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 640px;
  margin: 40px auto;
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

h1 { font-size: 1.5rem; margin-bottom: 20px; }
h2 { font-size: 1.1rem; margin: 20px 0 10px; }

hr { margin: 20px 0; border: none; border-top: 1px solid #eee; }

form { display: flex; flex-direction: column; gap: 10px; }
input { padding: 10px; border: 1px solid #ddd; border-radius: 4px; font-size: 1rem; }

button {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  background: #2563eb;
  color: #fff;
}
button:hover { opacity: 0.9; }
button.secondary { background: #6b7280; }

#log-btn { font-size: 1.1rem; padding: 12px 28px; }

.error { color: #dc2626; margin-top: 8px; }
.status { color: #16a34a; margin-top: 8px; font-size: 0.9rem; }

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}
th, td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid #eee;
  font-size: 0.9rem;
}
th { background: #f9fafb; font-weight: 600; }
.empty { text-align: center; color: #9ca3af; padding: 20px; }

code { background: #f1f5f9; padding: 2px 6px; border-radius: 3px; font-size: 0.85rem; }

.score-form { display: flex; gap: 8px; margin-top: 8px; }
.score-form input { flex: 1; }
.score-form button { white-space: nowrap; }

.hint { font-size: 0.85rem; color: #6b7280; margin-bottom: 4px; }