.wpw-calculator,
.wpw-calculator * { box-sizing: border-box; }

.wpw-calculator {
  --wpw-text: #1f2933;
  --wpw-muted: #66737f;
  --wpw-border: #dfe5e8;
  --wpw-soft: #f6f8f8;
  --wpw-soft-2: #eef4f2;
  --wpw-accent: #1f6f5c;
  --wpw-accent-strong: #175546;
  --wpw-warn: #fff8db;
  --wpw-positive: #eaf7ef;
  --wpw-negative: #fff0ee;
  --wpw-neutral: #f2f4f6;
  width: 100%;
  max-width: none;
  margin: 0;
  color: var(--wpw-text);
  font: inherit;
  line-height: 1.5;
}

.wpw-calculator h2,
.wpw-calculator h3,
.wpw-calculator p { margin-top: 0; }

.wpw-intro { margin-bottom: 20px; }
.wpw-eyebrow,
.wpw-result-kicker {
  margin-bottom: 6px;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--wpw-accent);
}
.wpw-intro h2 { margin-bottom: 8px; font-size: clamp(1.65rem, 3vw, 2.35rem); line-height: 1.15; }
.wpw-lead { max-width: 780px; margin-bottom: 12px; color: var(--wpw-muted); }
.wpw-period { display: inline-flex; gap: 5px; padding: 7px 11px; border-radius: 999px; background: var(--wpw-soft-2); font-size: .92rem; }

.wpw-demo-note,
.wpw-method-note {
  padding: 14px 16px;
  border: 1px solid #ebd98d;
  border-radius: 12px;
  background: var(--wpw-warn);
  font-size: .94rem;
}
.wpw-demo-note { margin-bottom: 18px; }

.wpw-form { width: 100%; margin: 0; }
.wpw-section {
  margin: 0 0 18px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--wpw-border);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 6px 22px rgba(24, 38, 45, .045);
}
.wpw-section-head { display: flex; gap: 13px; align-items: flex-start; margin-bottom: 20px; }
.wpw-section-head h3 { margin-bottom: 3px; font-size: 1.22rem; }
.wpw-section-head p { margin-bottom: 0; color: var(--wpw-muted); font-size: .94rem; }
.wpw-step {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--wpw-accent);
  color: #fff;
  font-weight: 800;
}

.wpw-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.wpw-field { display: block; min-width: 0; margin: 0; }
.wpw-field-full { grid-column: 1 / -1; }
.wpw-field legend,
.wpw-label { display: block; margin: 0 0 7px; font-weight: 700; font-size: .95rem; }
.wpw-fieldset, .wpw-field { border: 0; padding: 0; }
.wpw-field small { display: block; margin-top: 6px; color: var(--wpw-muted); font-size: .82rem; line-height: 1.38; }

.wpw-input-wrap { position: relative; display: flex; align-items: stretch; width: 100%; }
.wpw-input-wrap input {
  width: 100%;
  min-width: 0;
  height: 48px;
  margin: 0;
  padding: 10px 92px 10px 12px;
  border: 1px solid #cbd4d8;
  border-radius: 9px;
  background: #fff;
  color: var(--wpw-text);
  font: inherit;
  font-size: 1rem;
  outline: 0;
  box-shadow: none;
}
.wpw-input-wrap input:focus { border-color: var(--wpw-accent); box-shadow: 0 0 0 3px rgba(31, 111, 92, .12); }
.wpw-input-wrap input[aria-invalid="true"] { border-color: #b42318; box-shadow: 0 0 0 3px rgba(180, 35, 24, .08); }
.wpw-unit {
  position: absolute;
  right: 11px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--wpw-muted);
  font-size: .86rem;
  white-space: nowrap;
}

.wpw-segmented { display: inline-flex; gap: 0; overflow: hidden; border: 1px solid #cbd4d8; border-radius: 10px; background: #fff; }
.wpw-segmented label { margin: 0; cursor: pointer; }
.wpw-segmented input { position: absolute; opacity: 0; pointer-events: none; }
.wpw-segmented span { display: block; min-width: 100px; padding: 10px 20px; text-align: center; font-weight: 700; }
.wpw-segmented input:checked + span { background: var(--wpw-accent); color: #fff; }
.wpw-segmented input:focus-visible + span { outline: 3px solid rgba(31,111,92,.22); outline-offset: -3px; }
.wpw-segmented-small span { min-width: 82px; padding: 8px 15px; }

.wpw-subblock { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--wpw-border); }
.wpw-conditional { margin-top: 14px; }
.wpw-conditional[hidden] { display: none !important; }
.wpw-field[hidden],
[data-gas-base-field][hidden] { display: none !important; }

.wpw-form-error { margin: 0 0 14px; padding: 12px 14px; border-radius: 9px; background: #fff0ee; color: #8a1c13; font-weight: 650; }
.wpw-form-error[hidden] { display: none; }

.wpw-submit {
  width: 100%;
  min-height: 52px;
  border: 0;
  border-radius: 10px;
  padding: 13px 22px;
  background: var(--wpw-accent);
  color: #fff;
  font: inherit;
  font-size: 1.02rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease;
}
.wpw-submit:hover { background: var(--wpw-accent-strong); transform: translateY(-1px); }
.wpw-submit:focus-visible { outline: 3px solid rgba(31,111,92,.28); outline-offset: 2px; }

.wpw-results { margin-top: 28px; }
.wpw-results[hidden] { display: none !important; }
.wpw-result-hero,
.wpw-comparison-wrap,
.wpw-chart-wrap,
.wpw-metrics-wrap,
.wpw-details { margin-bottom: 18px; border: 1px solid var(--wpw-border); border-radius: 16px; background: #fff; }
.wpw-result-hero { padding: clamp(20px, 3vw, 30px); }
.wpw-result-hero.is-positive { background: var(--wpw-positive); }
.wpw-result-hero.is-negative { background: var(--wpw-negative); }
.wpw-result-hero.is-neutral { background: var(--wpw-neutral); }
.wpw-result-hero h3 { margin-bottom: 18px; font-size: clamp(1.25rem, 2.5vw, 1.7rem); line-height: 1.3; }
.wpw-result-main-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.wpw-result-main-card { padding: 15px; border-radius: 12px; background: rgba(255,255,255,.75); border: 1px solid rgba(0,0,0,.06); }
.wpw-result-main-card span { display: block; margin-bottom: 4px; color: var(--wpw-muted); font-size: .88rem; }
.wpw-result-main-card strong { display: block; font-size: clamp(1.2rem, 2.8vw, 1.75rem); line-height: 1.15; }

.wpw-comparison-wrap,
.wpw-chart-wrap,
.wpw-metrics-wrap { padding: clamp(18px, 3vw, 26px); }
.wpw-comparison-wrap h3,
.wpw-chart-wrap h3,
.wpw-metrics-wrap h3 { margin-bottom: 4px; font-size: 1.16rem; }
.wpw-comparison-wrap > p,
.wpw-chart-head p { margin-bottom: 16px; color: var(--wpw-muted); font-size: .9rem; }
.wpw-comparison-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.wpw-comparison-card { padding: 14px; border: 1px solid var(--wpw-border); border-radius: 12px; background: var(--wpw-soft); }
.wpw-comparison-card h4 { margin: 0 0 10px; font-size: 1rem; }
.wpw-comparison-row { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; font-size: .9rem; }
.wpw-comparison-row strong { white-space: nowrap; }
.wpw-comparison-diff { margin-top: 7px; padding-top: 8px; border-top: 1px solid var(--wpw-border); font-weight: 800; }
.wpw-comparison-diff.is-positive { color: #146c43; }
.wpw-comparison-diff.is-negative { color: #a12a20; }

.wpw-chart-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 18px; }
.wpw-legend { display: flex; flex-wrap: wrap; gap: 12px; color: var(--wpw-muted); font-size: .85rem; }
.wpw-legend > span { display: inline-flex; align-items: center; gap: 6px; }
.wpw-legend-line { width: 24px; height: 3px; border-radius: 3px; display: inline-block; }
.wpw-existing-line { background: #475569; }
.wpw-hp-line { background: #1f6f5c; }
.wpw-canvas-shell { width: 100%; overflow: hidden; }
.wpw-canvas-shell canvas { display: block; width: 100%; height: auto; max-height: 480px; }

.wpw-metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.wpw-metrics > div { padding: 14px; border: 1px solid var(--wpw-border); border-radius: 12px; background: var(--wpw-soft); }
.wpw-metrics span { display: block; margin-bottom: 5px; color: var(--wpw-muted); font-size: .82rem; }
.wpw-metrics strong { display: block; font-size: 1.08rem; }
.wpw-metrics abbr { text-decoration: none; cursor: help; font-size: .9em; }

.wpw-details { overflow: hidden; }
.wpw-details summary { cursor: pointer; padding: 16px 18px; font-weight: 800; }
.wpw-details[open] summary { border-bottom: 1px solid var(--wpw-border); }
.wpw-table-scroll { width: 100%; overflow-x: auto; }
.wpw-details table { width: 100%; min-width: 760px; border-collapse: collapse; margin: 0; font-size: .88rem; }
.wpw-details th,
.wpw-details td { padding: 10px 12px; border-bottom: 1px solid var(--wpw-border); text-align: right; }
.wpw-details th:first-child,
.wpw-details td:first-child { text-align: left; }
.wpw-details thead th { background: var(--wpw-soft); font-weight: 800; }
.wpw-details tbody tr:last-child td { border-bottom: 0; }

.wpw-method-note { margin-top: 18px; }

@media (max-width: 780px) {
  .wpw-grid { grid-template-columns: 1fr; }
  .wpw-field-full { grid-column: auto; }
  .wpw-comparison-cards { grid-template-columns: 1fr; }
  .wpw-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wpw-chart-head { display: block; }
  .wpw-legend { margin: 8px 0 12px; }
}

@media (max-width: 520px) {
  .wpw-calculator { width: 100%; max-width: 100%; }
  .wpw-section { padding: 16px; border-radius: 13px; }
  .wpw-section-head { gap: 10px; }
  .wpw-step { flex-basis: 29px; width: 29px; height: 29px; }
  .wpw-segmented { width: 100%; }
  .wpw-segmented label { flex: 1 1 50%; }
  .wpw-segmented span { min-width: 0; width: 100%; padding-left: 10px; padding-right: 10px; }
  .wpw-input-wrap input { height: 46px; padding-right: 82px; }
  .wpw-result-main-grid { grid-template-columns: 1fr; }
  .wpw-metrics { grid-template-columns: 1fr; }
  .wpw-result-hero,
  .wpw-comparison-wrap,
  .wpw-chart-wrap,
  .wpw-metrics-wrap { padding: 16px; border-radius: 13px; }
}