* { box-sizing: border-box; }

:root {
  --green: #176b40;
  --green-dark: #105b32;
  --green-light: #edf8f0;
  --border: #dfe8e1;
  --text: #26352b;
  --muted: #68756c;
}

body {
  margin: 0;
  padding: 28px 14px;
  background: #f1f5f2;
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

.calculator {
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  padding: 30px;
  background: #fff;
  border: 1px solid #e1e9e3;
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(24, 65, 40, .09);
}

.header {
  text-align: center;
  padding: 8px 0 24px;
  margin-bottom: 24px;
  border-bottom: 2px solid #e4eee6;
}

.brand {
  color: #16834a;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
}

h1 {
  color: var(--green);
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.25;
  margin: 12px 0 8px;
}

.header p { margin: 0; color: #748077; font-size: 14px; }

.notice {
  padding: 15px 18px;
  margin-bottom: 24px;
  background: var(--green-light);
  border-left: 4px solid #21864e;
  border-radius: 8px;
  color: #315b40;
}

.section {
  padding: 24px;
  margin-bottom: 22px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

.section h2, .results h2 {
  color: var(--green);
  font-size: 20px;
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid #e7eee8;
}

.field { margin: 0 0 16px; }

label {
  display: block;
  margin: 0 0 7px;
  color: #304438;
  font-size: 14px;
  font-weight: 700;
}

input, select {
  display: block;
  width: 100%;
  min-height: 46px;
  padding: 11px 13px;
  border: 1px solid #cbd8ce;
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

input:focus, select:focus {
  outline: none;
  border-color: #21864e;
  box-shadow: 0 0 0 3px rgba(33, 134, 78, .12);
}

.helper { color: var(--muted); font-size: 13px; line-height: 1.7; margin: 0 0 16px; }

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid #e8eee9;
  font-size: 14px;
}

.result-row span { flex: 1; min-width: 0; }
.result-row strong { flex: 0 0 auto; max-width: 48%; text-align: right; overflow-wrap: anywhere; color: var(--green); }

.total-row {
  margin-top: 12px;
  padding: 15px;
  border: 0;
  border-radius: 8px;
  background: #f0f7f1;
}

button {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 13px 18px;
  margin: 12px 0;
  border: 0;
  border-radius: 8px;
  background: #187443;
  color: #fff;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}
button:hover { background: var(--green-dark); }

.reset-button { background: #e8eee9; color: #304438; margin-bottom: 22px; }
.reset-button:hover { background: #d8e3db; }

.results {
  margin-top: 24px;
  padding: 24px;
  border: 2px solid #d5e8da;
  border-radius: 12px;
  background: #fbfdfb;
}
.results[hidden] { display: none; }

.final-row {
  margin-top: 14px;
  padding: 17px;
  border: 0;
  border-radius: 8px;
  background: #e6f5e9;
  font-size: 15px;
  font-weight: 700;
}
.final-row strong { color: #125b32; }

.disclaimer { margin: 20px 0 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
footer { margin-top: 26px; padding-top: 18px; border-top: 1px solid #e4ece6; text-align: center; color: #778279; font-size: 12px; }

@media (max-width: 600px) {
  body { padding: 12px 8px; }
  .calculator { padding: 16px; border-radius: 12px; }
  .section, .results { padding: 16px; margin-bottom: 16px; }
  .section h2, .results h2 { font-size: 18px; }
  .result-row { gap: 10px; font-size: 13px; }
  .result-row strong { max-width: 46%; }
}