*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
:root {
  --bg: #0a1a10;
  --card: #0f2318;
  --elevated: #152d1e;
  --green: #52b788;
  --green-dark: #2d6a4f;
  --text: #f0faf3;
  --secondary: #a8d8b8;
  --muted: #82b896;
  --border: rgba(82, 183, 136, .18);
}
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.6 'Inter', system-ui, sans-serif; }
a { color: var(--green); }
a:hover { color: var(--text); }
button, input, select { font: inherit; }
button, summary { cursor: pointer; }
:focus-visible { outline: 3px solid var(--green); outline-offset: 3px; }
[hidden] { display: none !important; }
.site-header {
  display: flex; align-items: center; gap: 12px; padding: 20px 32px;
  border-bottom: 1px solid var(--border); background: rgba(10,26,16,.94);
}
.header-logo { flex: none; width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; background: linear-gradient(135deg,var(--green-dark),var(--green)); }
.header-brand { flex: 1; min-width: 0; }
.header-brand a { display: block; color: var(--text); font: 700 17px 'Space Grotesk',sans-serif; text-decoration: none; letter-spacing: -.3px; }
.header-brand span { display: block; font-size: 12px; color: var(--muted); }
.nav-cta { border-radius: 8px; padding: 7px 16px; color: #fff; background: var(--green-dark); text-decoration: none; font-size: 13px; font-weight: 600; }
main { max-width: 1168px; margin: auto; padding: 36px 32px 90px; }
.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb span { padding: 0 8px; }
h1,h2,h3,p { margin-top: 0; }
h1,h2,h3 { font-family: 'Space Grotesk',sans-serif; line-height: 1.2; }
h1 { font-size: clamp(28px,4vw,42px); letter-spacing: -.6px; margin-bottom: 10px; }
.lead { color: var(--secondary); font-size: 16px; max-width: 740px; margin: 0 0 24px; }
.calculator-layout { display: grid; grid-template-columns: minmax(0,1.18fr) minmax(340px,.82fr); gap: 20px; align-items: start; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 18px; }
.input-panel { padding: 26px 30px 20px; }
.eyebrow { color: var(--green); font-size: 11px; font-weight: 700; letter-spacing: .13em; }
.panel-heading { margin-bottom: 14px; }
.panel-heading h2, .results-header h2 { margin: 5px 0 7px; font-size: 24px; }
.panel-heading p { font-size: 13px; color: var(--muted); margin: 0; }
.panel-heading .adjustment-hint { margin-top: 9px; color: var(--secondary); font-size: 12px; }
.mobile-result-link { display: none; }
fieldset { border: none; padding: 20px 0 7px; margin: 0; border-top: 1px solid var(--border); min-width: 0; }
legend { float: left; width: 100%; margin-bottom: 17px; color: var(--green); font: 600 13px 'Space Grotesk',sans-serif; }
legend span { margin-left: 8px; color: var(--text); font-size: 18px; }
legend + * { clear: both; }
.field { min-width: 0; margin-bottom: 17px; }
.field-row { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.field label, .quote-field label { display: block; color: var(--text); font-size: 13px; font-weight: 600; margin-bottom: 7px; }
.unit { color: var(--muted); font-size: 12px; font-weight: 500; }
input[type="number"],select {
  width: 100%; height: 45px; border-radius: 9px; border: 1px solid rgba(168,216,184,.28);
  background: #0b1c12; color: var(--text); padding: 9px 12px; outline: none;
}
input[type="number"]:focus,select:focus { border-color: var(--green); box-shadow: 0 0 0 2px rgba(82,183,136,.18); }
input[aria-invalid="true"],select[aria-invalid="true"] { border-color: #eab880; }
.field small, .quote-field small { display: block; color: var(--muted); font-size: 11.5px; line-height: 1.5; margin-top: 5px; }
.field .error,.quote-field .error { color: #f3c18a; font-size: 12px; }
.error:empty { display: none; }
input[type="range"] { width: 100%; margin: 10px 0 0; accent-color: var(--green); }
.form-errors { padding: 10px 13px; border: 1px solid #b3804a; background: #302416; color: #f3c18a; border-radius: 8px; margin: 12px 0; font-size: 13px; }
.input-details { border: 1px solid var(--border); border-radius: 10px; background: var(--elevated); margin: 6px 0 19px; }
.input-details summary { list-style: none; padding: 13px 16px; font-weight: 600; color: var(--text); font-size: 13px; }
.input-details summary::-webkit-details-marker { display: none; }
.input-details summary::before { content: '+'; color: var(--green); display: inline-block; width: 23px; font-size: 18px; line-height: 1; vertical-align: middle; }
.input-details[open] summary::before { content: '−'; }
.input-details summary span { display: block; margin-left: 23px; font-size: 11px; color: var(--muted); font-weight: 400; }
.input-details .details-body { padding: 14px 16px 0; border-top: 1px solid var(--border); }
.property-details { margin: 12px 0; }
.check-field { margin-bottom: 14px; }
.check-field label { display: inline-flex; gap: 9px; align-items: center; font-size: 13px; font-weight: 600; }
.check-field input { width: 17px; height: 17px; accent-color: var(--green-dark); }
.text-button { border: 0; background: none; color: var(--green); font-size: 12px; font-weight: 700; padding: 8px; text-decoration: underline; text-underline-offset: 3px; }
.text-button:hover { color: var(--text); }
.reset { padding: 9px 0; }
.results-wrap { position: sticky; top: 20px; min-width: 0; }
.results-panel { overflow: hidden; }
.results-header { padding: 23px 25px 0; }
.results-header h2 { font-size: 21px; }
.results-empty { padding: 40px 25px; color: #f3c18a; }
.hero-price { display: flex; align-items: baseline; gap: 10px; background: linear-gradient(135deg,#173c28,#0f2a1c); padding: 10px 25px 0; }
.hero-price span:first-child { font: 700 clamp(48px,5vw,68px)/1.2 'Space Grotesk',sans-serif; letter-spacing: -2px; color: var(--text); }
.hero-price span:last-child { color: var(--secondary); font-size: 13px; }
.result-note { background: #0f2a1c; padding: 0 25px 20px; margin: 0; color: var(--secondary); font-size: 12px; }
.quote-field { padding: 17px 25px; border-bottom: 1px solid var(--border); }
.quote-line { display: flex; align-items: center; gap: 7px; }
.quote-line input { max-width: 150px; }
.warnings { padding: 0 25px; }
.warnings:not(:empty) { padding-top: 14px; }
.warning { border-left: 3px solid #eab880; border-radius: 6px; background: #302416; color: #f3c18a; padding: 9px 11px; font-size: 12px; margin-bottom: 7px; }
.metric-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1px; background: var(--border); margin: 0; }
.metric-grid div { padding: 16px 20px; background: var(--card); min-width: 0; }
dt { color: var(--muted); font-size: 11px; }
dd { margin: 0; font-variant-numeric: tabular-nums; }
.metric-grid dd { color: var(--text); font: 700 20px 'Space Grotesk',sans-serif; margin-top: 5px; }
.recurring { padding: 14px 25px; border-bottom: 1px solid var(--border); }
.recurring-row { display: flex; gap: 10px; justify-content: space-between; align-items: baseline; margin-bottom: 8px; font-size: 12px; color: var(--secondary); }
.recurring-row strong { color: var(--text); font: 700 17px 'Space Grotesk',sans-serif; white-space: nowrap; }
.recurring small { display: block; font-size: 11px; color: var(--muted); }
.breakdown summary { list-style: none; padding: 17px 25px; color: var(--green); font-size: 13px; font-weight: 700; }
.breakdown summary::-webkit-details-marker { display: none; }
.breakdown summary::after { content: '⌄'; float: right; font-size: 17px; line-height: 1; }
.breakdown[open] summary::after { transform: rotate(180deg); }
.breakdown-body { border-top: 1px solid var(--border); padding: 12px 25px 17px; }
.breakdown dl { margin: 0; }
.breakdown dl > div { display: flex; justify-content: space-between; gap: 14px; padding: 5px 0; }
.breakdown dt,.breakdown dd { font-size: 12px; color: var(--secondary); }
.breakdown dd { text-align: right; white-space: nowrap; }
.breakdown .total { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 12px; font-weight: 700; }
.breakdown .total dt,.breakdown .total dd { color: var(--text); }
.calculation-details { border-top: 1px solid var(--border); margin-top: 10px !important; padding-top: 10px; }
.explanation { color: var(--secondary); font-size: 12px; border-left: 2px solid var(--green-dark); padding-left: 10px; margin: 12px 0 0; line-height: 1.6; }
.copy-button { display: block; width: calc(100% - 50px); margin: 4px 25px 8px; border: none; border-radius: 9px; background: var(--green-dark); color: #fff; padding: 12px 15px; font-weight: 700; }
.copy-button:hover { background: #388361; }
.copy-button:disabled { opacity: .5; cursor: not-allowed; }
.copy-status { display: block; padding: 0 25px 16px; color: var(--secondary); font-size: 12px; }
.copy-status:empty { display: none; }
.below-tool { max-width: 850px; margin: 68px auto 0; }
.below-tool section { margin-bottom: 34px; }
.below-tool h2 { font-size: 25px; margin: 4px 0 13px; }
.below-tool p { color: var(--secondary); line-height: 1.75; }
.formula { padding: 20px 23px; background: var(--elevated); border: 1px solid var(--border); border-radius: 12px; color: var(--secondary); margin: 18px 0; line-height: 2; }
.formula strong { color: var(--text); }
.faq details { border: 1px solid var(--border); border-radius: 10px; margin: 8px 0; background: var(--card); }
.faq summary { padding: 14px 17px; color: var(--text); font-weight: 600; }
.faq details p { padding: 0 17px 16px; margin: 0; font-size: 14px; }
.related { border-top: 1px solid var(--border); padding-top: 22px; margin-top: 32px; }
footer { text-align: center; border-top: 1px solid var(--border); padding: 28px 20px; color: var(--muted); font-size: 13px; }
footer a { color: var(--secondary); }
@media (max-width: 860px) {
  .calculator-layout { grid-template-columns: 1fr; }
  .results-wrap { position: static; }
  .mobile-result-link {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    margin-top: 15px; padding: 9px 13px; border-radius: 8px; border: 1px solid var(--border);
    background: var(--elevated); color: var(--green); text-decoration: none; font-size: 13px; font-weight: 600;
  }
  #results-heading { scroll-margin-top: 20px; }
}
@media (max-width: 600px) {
  .site-header { padding: 15px 20px; }
  .nav-cta { display: none; }
  main { padding: 28px 18px 65px; }
  .breadcrumb { margin-bottom: 15px; }
  .lead { font-size: 14px; margin-bottom: 16px; }
  .input-panel { padding: 20px 18px 12px; }
  .field-row { gap: 11px; }
  .field-row .field { min-width: 0; }
  .field-row label { line-height: 1.35; min-height: 34px; }
  .results-header,.quote-field,.recurring { padding-left: 19px; padding-right: 19px; }
  .hero-price { padding-left: 19px; }
  .result-note { padding-left: 19px; }
  .metric-grid div { padding: 13px 16px; }
  .breakdown summary { padding-left: 19px; padding-right: 19px; }
  .breakdown-body { padding-left: 19px; padding-right: 19px; }
  .copy-button { width: calc(100% - 38px); margin-left: 19px; margin-right: 19px; }
  .below-tool { margin-top: 48px; }
}
@media (max-width: 370px) {
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .field-row label { min-height: 0; }
}