:root {
  color-scheme: light dark;
  --bg: #f5f5f8;
  --card-bg: #ffffffcc;
  --text: #1f2933;
  --muted: #4b5563;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --radius: 16px;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.15);
  font-family: 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #eef2ff, #f8fafc);
  color: var(--text);
  padding: 24px;
}

.app {
  width: min(100%, 640px);
  display: grid;
  gap: 24px;
}

.app__header {
  text-align: center;
  padding: 16px;
}

.app__header h1 {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 2.5vw + 1rem, 2.25rem);
}

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

.card {
  background-color: var(--card-bg);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: clamp(20px, 4vw, 28px);
  box-shadow: var(--shadow);
}

.card h2 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 1.25rem;
}

.form {
  display: grid;
  gap: 16px;
}

.form__field {
  display: grid;
  gap: 8px;
}

.form__field span {
  font-weight: 600;
}

.form__hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.form__button {
  margin-top: 4px;
  align-self: start;
  padding: 10px 16px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent), #5094ff);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.form__button:active {
  transform: scale(0.98);
}

.form__button:hover {
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
}

.form__field input {
  border: 1px solid rgba(148, 163, 184, 0.7);
  border-radius: 12px;
  padding: 12px;
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form__field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.results {
  display: grid;
  gap: 12px;
  margin: 0;
}

.results__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 12px 16px;
  background-color: rgba(37, 99, 235, 0.08);
  border-radius: 12px;
}

.results__row dt {
  margin: 0;
  font-weight: 600;
  color: var(--muted);
}

.results__row dd {
  margin: 0;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
}

@media (max-width: 600px) {
  body {
    padding: 16px;
  }

  .card {
    padding: 20px;
  }

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

  .results__row dd {
    font-size: 1.05rem;
  }
}