.calc-page { max-width: 1320px; padding-top: 32px; padding-bottom: 72px; }
.calc-heading { margin-bottom: 28px; }
.calc-heading .crumbs { margin: 0 0 20px; }
.calc-kicker { color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .13em; }
.calc-heading h1 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.14; letter-spacing: -.035em; margin: 10px 0; }
.calc-context { color: var(--ink-soft); margin: 0; }
.calc-layout { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: start; }
.calc-form { background: var(--bg-card); border: 1px solid var(--line); border-radius: 14px; padding: 26px; }
.calc-form fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
.calc-form legend { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.calc-toolbar { display: flex; gap: 16px; align-items: end; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.calc-toolbar > div { flex: 1; }
.calc-toolbar label { display: block; font-size: .78rem; font-weight: 700; margin-bottom: 5px; }
.calc-toolbar select { width: 100%; min-height: 42px; border: 1px solid var(--line); border-radius: 7px; background: #fff; padding: 8px; font: inherit; }
.calc-form h2 { font-size: .95rem; margin: 22px 0 14px; }
.calc-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.calc-field { min-width: 0; }
.calc-label { display: flex; gap: 6px; align-items: center; min-height: 26px; margin-bottom: 5px; }
.calc-label label { font-size: .78rem; font-weight: 600; line-height: 1.25; }
.calc-input { display: flex; border: 1px solid #b8c4d1; border-radius: 7px; background: #fff; overflow: hidden; }
.calc-input:focus-within { outline: 2px solid var(--teal); outline-offset: 2px; }
.calc-input input { min-width: 0; width: 100%; border: 0; outline: 0; padding: 10px 8px 10px 12px; font: 500 1rem var(--mono); background: transparent; }
.calc-input > span { display: flex; align-items: center; white-space: nowrap; padding: 0 10px 0 2px; color: var(--ink-soft); font-size: .71rem; }
.calc-help { position: relative; flex: 0 0 auto; }
.calc-help summary { display: grid; place-items: center; width: 24px; height: 24px; border: 1px solid var(--line); border-radius: 50%; font: 600 .73rem var(--font); cursor: pointer; list-style: none; }
.calc-help summary::-webkit-details-marker { display: none; }
.calc-help > div { position: absolute; z-index: 6; top: 31px; right: 0; width: 240px; max-width: 75vw; background: var(--ink); color: #fff; padding: 14px; border-radius: 8px; font-size: .82rem; box-shadow: var(--shadow-soft); }
.calc-field:nth-child(odd) .calc-help > div { left: 0; right: auto; }
.calc-help[open] summary { background: var(--ink); color: white; }
.calc-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 24px; }
.calc-actions .btn { font-size: .86rem; padding: 11px 17px; }
.calc-reset { border: 0; background: transparent; color: var(--ink-soft); text-decoration: underline; padding: 12px 6px; font: inherit; cursor: pointer; }
.calc-status { min-height: 2.8em; margin: 16px 0 0; color: var(--ink-soft); font-size: .78rem; }
.calc-summary { position: sticky; top: 100px; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--bg-card); }
.calc-empty { padding: 36px 28px; min-height: 350px; display: flex; flex-direction: column; justify-content: center; }
.calc-empty h2 { font-size: 1.6rem; line-height: 1.3; margin: 14px 0; max-width: 14ch; }
.calc-empty p { max-width: 30ch; color: var(--ink-soft); }
.calc-preview { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; font-size: .72rem; border-top: 1px solid var(--line); padding-top: 24px; margin-top: 18px; }
.calc-preview span { color: var(--accent); font-weight: 800; }
.calc-margin { background: var(--teal); color: #fff; padding: 24px; }
.calc-margin.is-negative { background: #9b2435; }
.calc-margin h2 { margin: 0; font-size: .85rem; font-weight: 500; color: inherit; }
.calc-margin output { display: block; font: 500 clamp(1.4rem, 2.8vw, 2.35rem) var(--mono); margin: 7px 0; overflow-wrap: anywhere; }
.calc-margin > span { font-size: .75rem; }
.calc-limitation { padding: 9px 24px; margin: 0; background: var(--bg-alt); font-size: .74rem; }
.calc-metrics { padding: 12px 24px; margin: 0; }
.calc-metrics > div { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; }
.calc-metrics dt { font-size: .76rem; color: var(--ink-soft); }
.calc-metrics dd { flex: 0 0 auto; max-width: 58%; text-align: right; font: 500 .8rem var(--mono); margin: 0; overflow-wrap: anywhere; }
.calc-break-even { border-top: 1px solid var(--line); margin-top: 6px; padding-top: 16px !important; }
.calc-distance { padding: 16px 24px; border-top: 1px solid var(--line); }
.calc-distance > div:not(.calc-distance-bar) { display: flex; justify-content: space-between; gap: 8px; font-size: .77rem; }
.calc-distance strong { font-weight: 500; font-family: var(--mono); }
.calc-distance-bar { display: flex; height: 8px; background: #cbd5e1; border-radius: 4px; overflow: hidden; margin: 10px 0; }
.calc-distance-bar span { width: var(--loaded-share, 100%); background: var(--teal); }
.calc-breakdown { border-top: 1px solid var(--line); }
.calc-breakdown > summary { padding: 16px 24px; cursor: pointer; font-size: .8rem; }
.calc-method, .calc-faq { margin-top: 48px; max-width: 900px; }
.calc-method h2, .calc-faq h2 { font-size: 1.4rem; margin-bottom: 18px; }
.calc-formulas { margin: 0; }
.calc-formulas > div { display: grid; grid-template-columns: 190px 1fr; gap: 24px; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: .86rem; }
.calc-formulas dt { font-weight: 600; }
.calc-formulas dd { margin: 0; color: var(--ink-soft); }
.calc-worked { margin-top: 20px; }
.calc-worked summary, .calc-faq summary { cursor: pointer; font-weight: 600; }
.calc-worked p, .calc-faq p { font-size: .9rem; color: var(--ink-soft); }
.calc-method-links { display: flex; flex-wrap: wrap; gap: 20px; font-size: .87rem; margin-top: 24px; }
.calc-faq details { border-top: 1px solid var(--line); padding: 15px 0; }
.calc-page [hidden] { display: none !important; }
@media (max-width: 850px) {
  .calc-layout { grid-template-columns: 1fr; gap: 20px; }
  .calc-summary { position: static; }
  .calc-empty { min-height: 180px; }
  .calc-empty h2 { max-width: none; }
  .calc-margin output { font-size: 2rem; }
}
@media (max-width: 480px) {
  .calc-page { padding-top: 20px; }
  .calc-form { padding: 18px 14px; }
  .calc-fields { grid-template-columns: 1fr; gap: 13px; }
  .calc-label { position: relative; min-height: 24px; }
  .calc-input input { min-height: 44px; }
  .calc-field .calc-help { position: static; }
  .calc-field .calc-help > div { left: 0; right: auto; max-width: 100%; }
  .calc-formulas > div { grid-template-columns: 1fr; gap: 5px; }
  .calc-method, .calc-faq { margin-top: 34px; }
}