:root {
  --bg: #f2f5f7;
  --surface: #ffffff;
  --text: #12202f;
  --muted: #5a6672;
  --border: #d4dce4;
  --primary: #0f8b8d;
  --primary-hover: #0b6f71;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Roboto", sans-serif;
  background: radial-gradient(circle at top left, #e4edf3, var(--bg) 45%);
  color: var(--text);
}

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 20px 16px 28px;
}

.header {
  margin-bottom: 14px;
}

.header h1 {
  margin: 0 0 6px;
  font-size: 1.4rem;
}

.header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

form {
  display: grid;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

label {
  font-size: 0.92rem;
  font-weight: 600;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.95rem;
  color: var(--text);
}

input:focus {
  outline: 2px solid color-mix(in srgb, var(--primary) 30%, transparent);
  border-color: var(--primary);
}

.currencies {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  margin: 8px 0 2px;
}

.currencies legend {
  font-size: 0.92rem;
  font-weight: 700;
  padding: 0 6px;
}

.currency-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  position: relative;
}

.chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.chip span {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 11px;
  font-size: 0.87rem;
  background: #fbfdff;
}

.chip input:checked + span {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 15%, white);
}

.error {
  margin: 2px 0;
  min-height: 1.2em;
  color: var(--danger);
  font-size: 0.88rem;
}

button {
  border: 0;
  border-radius: 10px;
  background: var(--primary);
  color: white;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 11px 14px;
  cursor: pointer;
}

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

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}