:root {
  color-scheme: light;
  font-family: "Segoe UI", Roboto, sans-serif;
  background: #f4f7fb;
  color: #132238;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(135deg, #f4f7fb, #e5eef8);
}

.page-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.hero-card,
.calculator-card,
.results-card {
  background: #ffffff;
  border: 1px solid #dfe7f1;
  border-radius: 20px;
  box-shadow: 0 14px 40px rgba(14, 31, 53, 0.08);
  padding: 24px;
  margin-bottom: 24px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.8rem;
  color: #2d7a4d;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin-top: 0;
}

.intro {
  max-width: 760px;
  line-height: 1.6;
  color: #4b5c72;
}

.calculator-card {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
}

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

.field-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label {
  font-weight: 600;
}

input,
select,
button {
  font: inherit;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #cfd9e3;
}

.input-inline {
  display: flex;
  gap: 10px;
}

.input-inline input {
  flex: 1;
}

button {
  background: #2d7a4d;
  color: white;
  border: none;
  cursor: pointer;
  font-weight: 700;
  transition: transform 120ms ease, background 120ms ease;
}

button:hover {
  background: #24693f;
  transform: translateY(-1px);
}

.assumptions-card ul {
  padding-left: 18px;
  color: #4b5c72;
  line-height: 1.7;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.result-box {
  background: #f7fafc;
  border: 1px solid #e1ebf3;
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.label {
  color: #6a7b90;
  font-size: 0.95rem;
}

.note-box {
  background: #eef7f0;
  border-left: 4px solid #2d7a4d;
  border-radius: 12px;
  padding: 16px 18px;
  color: #2d4a3b;
}

@media (max-width: 840px) {
  .calculator-card {
    grid-template-columns: 1fr;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }
}