:root {
  --brand: #276ef1;
  --brand-pressed: #1b4db1;
  --text: #0f172a;
  --muted: #475569;
  --bg: #ffffff;
  --border: #e2e8f0;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
}

.container {
  max-width: 720px;
  margin: 6rem auto;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}

h1 {
  margin: 0 0 0.75rem 0;
  font-size: 1.75rem;
}

.hint {
  margin: 0 0 1.25rem 0;
  color: var(--muted);
}

form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 1rem;
}

label {
  grid-column: 1 / -1;
  font-weight: 600;
}

input[type="text"] {
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  width: 100%;
}

button {
  padding: 0.8rem 1.2rem;
  border: none;
  border-radius: 10px;
  background: var(--brand);
  color: white;
  font-weight: 600;
  cursor: pointer;
}
button:active { background: var(--brand-pressed); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

#result {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px dashed var(--border);
  border-radius: 10px;
  min-height: 64px;
  display: grid;
  gap: 0.5rem;
  align-items: center;
}

.card {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fafafa;
  display: grid;
  gap: 0.25rem;
}

.key { color: var(--muted); font-size: 0.9rem; }
.value { font-weight: 700; }

footer { margin-top: 1rem; color: var(--muted); }
@media (max-width: 768px) {
  .container { margin: 2rem 1rem; }
}