:root {
  --bg: #f3efe6;
  --panel: rgba(255, 252, 246, 0.92);
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #b45309;
  --accent-strong: #92400e;
  --border: rgba(31, 41, 55, 0.12);
  --danger: #b91c1c;
  --shadow: 0 24px 60px rgba(84, 54, 20, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(180, 83, 9, 0.16), transparent 28%),
    radial-gradient(circle at bottom right, rgba(15, 118, 110, 0.12), transparent 24%),
    linear-gradient(135deg, #f8f5ee, var(--bg));
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(100%, 560px);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
}

.intro {
  margin: 12px 0 24px;
  color: var(--muted);
}

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

.field {
  display: grid;
  gap: 8px;
  font-size: 0.95rem;
}

.field span {
  font-weight: 600;
}

input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  font: inherit;
  color: inherit;
  background: rgba(255, 255, 255, 0.78);
}

input:focus {
  outline: 2px solid rgba(180, 83, 9, 0.25);
  border-color: rgba(180, 83, 9, 0.5);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  cursor: pointer;
  color: #fffdf8;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

button.ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.error {
  margin: 14px 0 0;
  color: var(--danger);
  font-size: 0.95rem;
}

.result {
  margin-top: 24px;
  padding: 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(180, 83, 9, 0.14);
}

.result-label {
  margin: 0;
  color: var(--muted);
}

.result-value {
  margin: 8px 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
}

.result-formula {
  margin: 0;
  color: var(--muted);
  word-break: break-word;
}

@media (max-width: 640px) {
  .card {
    padding: 22px;
    border-radius: 20px;
  }

  .actions {
    flex-direction: column;
  }

  button {
    width: 100%;
  }
}