:root {
  --bg: #f2f5f9;
  --card: #ffffff;
  --text: #17202a;
  --muted: #52606d;
  --primary: #0b7285;
  --primary-hover: #095c6b;
  --border: #d8dee9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #dff3fa, var(--bg) 40%);
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px;
}

header {
  margin-bottom: 16px;
}

h1 {
  margin: 0;
}

h2, h3 {
  margin-top: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}

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

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-weight: 600;
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

textarea {
  resize: vertical;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  color: #fff;
  background: var(--primary);
  cursor: pointer;
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

button:hover {
  background: var(--primary-hover);
}

.secondary {
  background: #445b69;
}

.secondary:hover {
  background: #334652;
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.disabled {
  opacity: 0.65;
}

.disabled input,
.disabled select,
.disabled textarea,
.disabled button[type="submit"] {
  pointer-events: none;
}

.hint {
  color: var(--muted);
}

#result {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 900px) {
  .grid.two,
  .grid.four {
    grid-template-columns: 1fr;
  }
}