:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --panel: #fffdf8;
  --panel-border: #d9d1c3;
  --text: #1f1d1a;
  --muted: #6a6258;
  --accent: #1d6b57;
  --accent-soft: #e2f1eb;
  --shadow: 0 18px 40px rgba(33, 28, 21, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background:
    radial-gradient(circle at top, rgba(29, 107, 87, 0.15), transparent 34%),
    linear-gradient(180deg, #f8f5ef 0%, var(--bg) 100%);
  color: var(--text);
}

.calculator {
  width: min(100% - 2rem, 760px);
  margin: 0 auto;
  padding: 3.5rem 0 4rem;
}

.hero {
  margin-bottom: 1.75rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

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

h1 {
  margin-bottom: 0.75rem;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.05;
}

.description,
.section-heading p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
}

.card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.card + .card {
  margin-top: 1rem;
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2 {
  margin-bottom: 0.35rem;
  font-size: 1.2rem;
}

.tool-list {
  display: grid;
  gap: 0.8rem;
}

.tool-option {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  background: #fff;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.tool-option:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.tool-option input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}

.tool-option span {
  font-weight: 600;
}

.tool-option strong {
  color: var(--accent);
}

.results {
  background: linear-gradient(180deg, var(--panel) 0%, var(--accent-soft) 100%);
}

.result-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.25rem 0;
}

.result-row span {
  color: var(--muted);
}

.result-row strong {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
}

.summary {
  margin: 1rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(31, 29, 26, 0.12);
  font-size: 1.05rem;
}

@media (max-width: 640px) {
  .calculator {
    width: min(100% - 1.25rem, 760px);
    padding: 2.5rem 0 3rem;
  }

  .card {
    padding: 1.1rem;
  }

  .tool-option {
    grid-template-columns: auto 1fr;
  }

  .tool-option strong {
    grid-column: 2;
  }

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