.calculator-page { background: var(--paper); }
.calculator-page .site-header {
  background: rgba(241,240,235,.95);
  color: var(--ink);
  border-color: var(--line);
  backdrop-filter: blur(14px);
}
.calculator-page .nav-cta[aria-current="page"] { background: var(--accent); color: #fff; border-color: var(--accent); }

.calculator-main { padding: calc(var(--header-height) + 8vh) 3vw 13vh; }
.calculator-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(260px, .55fr);
  gap: 6vw;
  align-items: end;
  margin-bottom: 9vh;
}
.calculator-intro h1 {
  max-width: 1050px;
  color: var(--ink);
  font-size: clamp(4.5rem, 8vw, 9rem);
}
.calculator-intro-copy { padding-top: 28px; border-top: 1px solid var(--line); }
.calculator-intro-copy p { margin: 0 0 30px; color: #5f5d57; font-size: 1.05rem; line-height: 1.6; }
.calculator-intro-copy a { display: inline-flex; gap: 10px; font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; }

.calculator-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(330px, .65fr);
  gap: 18px;
  align-items: start;
}
.calculator-form { background: var(--paper-bright); border: 1px solid var(--line); }
.calculator-group { min-width: 0; margin: 0; padding: 42px; border: 0; border-bottom: 1px solid var(--line); }
.calculator-group:last-child { border-bottom: 0; }
.calculator-group legend {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0;
  font-size: clamp(1.5rem, 2.4vw, 2.35rem);
  font-weight: 400;
  letter-spacing: -.035em;
}
.calculator-group legend span { color: var(--accent); font: 12px/1 "Courier New", monospace; letter-spacing: .08em; }
.group-hint { margin: 12px 0 30px 31px; color: #77756e; line-height: 1.5; }
.calculator-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 32px; }
.calculator-field { min-width: 0; display: flex; flex-direction: column; gap: 12px; }
.calculator-field > span:first-child,
.calculator-field > label { font-size: .9rem; }
.calculator-field small { color: #77756e; line-height: 1.4; }
.field-control { position: relative; display: block; }
.field-control input {
  width: 100%;
  height: 86px;
  padding: 0 78px 0 22px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 clamp(2rem, 3.4vw, 3.5rem)/1 Arial, Helvetica, sans-serif;
  letter-spacing: -.045em;
  appearance: textfield;
}
.field-control input::-webkit-inner-spin-button { appearance: none; }
.field-control input:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.field-control b { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: #77756e; font: 12px/1 "Courier New", monospace; text-transform: uppercase; }
.thickness-range { width: 100%; height: 18px; margin: 2px 0 0; accent-color: var(--accent); cursor: pointer; }

.choice-grid { display: grid; gap: 12px; }
.choice-grid-types { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.choice-grid-options { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.calc-choice { position: relative; min-width: 0; cursor: pointer; }
.calc-choice input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.choice-surface {
  min-height: 250px;
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}
.calc-option .choice-surface { min-height: 205px; }
.calc-choice:hover .choice-surface { transform: translateY(-2px); border-color: rgba(17,17,15,.42); }
.choice-check { width: 18px; height: 18px; margin-bottom: 35px; border: 1px solid #77756e; border-radius: 50%; }
.calc-option .choice-check { border-radius: 2px; }
.choice-surface strong { margin-bottom: 12px; font-size: 1.22rem; font-weight: 400; line-height: 1.2; }
.choice-surface small { color: #68665f; line-height: 1.5; }
.choice-surface b { margin-top: auto; padding-top: 28px; color: #77756e; font: 12px/1.3 "Courier New", monospace; }
.calc-choice input:checked + .choice-surface { border-color: var(--accent); background: #fff7f3; }
.calc-choice input:checked + .choice-surface .choice-check { border: 5px solid var(--accent); background: #fff; }
.calc-option input:checked + .choice-surface .choice-check { border: 0; background: var(--accent); box-shadow: inset 0 0 0 5px #fff7f3; }
.calc-choice input:focus-visible + .choice-surface { outline: 3px solid rgba(255,90,31,.35); outline-offset: 2px; }

.calculator-result {
  position: sticky;
  top: calc(var(--header-height) + 18px);
  min-height: 690px;
  padding: 38px;
  background: var(--ink);
  color: var(--paper-bright);
  overflow: hidden;
}
.calculator-result::after {
  content: "";
  position: absolute;
  right: -100px;
  bottom: -115px;
  width: 280px;
  height: 280px;
  border: 55px solid rgba(255,90,31,.18);
  border-radius: 50%;
}
.calculator-result > * { position: relative; z-index: 1; }
.calculator-result .section-kicker { color: rgba(255,255,255,.65); }
.result-total { padding-bottom: 34px; border-bottom: 1px solid rgba(255,255,255,.2); }
.result-total > span { display: block; margin-bottom: 14px; color: rgba(255,255,255,.55); font-size: .82rem; }
.result-total strong { display: block; color: var(--accent); font-size: clamp(2.3rem, 3.2vw, 3.7rem); font-weight: 400; line-height: .95; letter-spacing: -.055em; white-space: nowrap; }
.result-total small { display: block; margin-top: 13px; color: rgba(255,255,255,.62); }
.result-breakdown { padding: 32px 0 22px; }
.result-breakdown h2 { margin: 0 0 18px; font-size: 1rem; font-weight: 400; }
.result-breakdown ul { list-style: none; margin: 0; padding: 0; }
.result-breakdown li { display: flex; justify-content: space-between; gap: 24px; padding: 10px 0; color: rgba(255,255,255,.62); font-size: .83rem; border-bottom: 1px solid rgba(255,255,255,.08); }
.result-breakdown li[hidden] { display: none; }
.result-breakdown li b { color: var(--paper-bright); font-weight: 400; text-align: right; }
.result-included { margin: 0 0 16px; color: rgba(255,255,255,.72); line-height: 1.5; }
.result-note { margin: 0; padding-left: 14px; border-left: 2px solid var(--accent); color: rgba(255,255,255,.48); font-size: .78rem; line-height: 1.5; }
.result-actions { display: grid; gap: 12px; margin-top: 28px; }
.result-actions .button { width: 100%; border: 0; cursor: pointer; }
.reset-button { min-height: 44px; border: 0; background: transparent; color: rgba(255,255,255,.62); cursor: pointer; text-decoration: underline; text-underline-offset: 4px; }
.calculator-footer { margin-top: 0; }

@media (max-width: 1080px) {
  .calculator-shell { grid-template-columns: minmax(0, 1.25fr) minmax(310px, .75fr); }
  .choice-grid-types { grid-template-columns: 1fr; }
  .choice-grid-types .choice-surface { min-height: 190px; }
}

@media (max-width: 820px) {
  .calculator-main { padding: calc(var(--header-height) + 55px) 20px 90px; }
  .calculator-intro { grid-template-columns: 1fr; gap: 45px; margin-bottom: 60px; }
  .calculator-intro h1 { font-size: clamp(4rem, 17vw, 6.2rem); }
  .calculator-shell { grid-template-columns: 1fr; }
  .calculator-result { position: relative; top: auto; min-height: auto; order: 2; padding: 30px 24px; }
  .calculator-group { padding: 32px 20px; }
  .calculator-fields, .choice-grid-options { grid-template-columns: 1fr; }
  .choice-surface, .calc-option .choice-surface { min-height: 190px; }
  .group-hint { margin-left: 0; }
}

@media (max-width: 480px) {
  .calculator-intro h1 { font-size: 3.7rem; }
  .calculator-group legend { font-size: 1.45rem; }
  .result-total strong { font-size: 2.4rem; }
}