:root {
  --paper: #f4f7f5;
  --grid: #dfe8e3;
  --ink: #15302a;
  --ink-soft: #4d6159;
  --green: #1f7a5a;
  --green-deep: #155a42;
  --line: #c9d6cf;
  --surface: #ffffff;
  --marker: #f6e35a;
  --pen: #c24a17;
  --err: #b3261e;

  --font: 'Archivo', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --hand: 'Caveat', 'Comic Sans MS', cursive;
  --radius: 10px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; scroll-padding-bottom: 120px; }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); border: 0;
}

/* ---------- app shell: one screen at a time ---------- */
.app {
  max-width: 560px;
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 0 16px;
}
#calc { display: contents; }

.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 0 10px;
  background: var(--paper);
  border-bottom: 1px solid var(--grid);
}
.back {
  display: inline-flex; align-items: center; gap: 2px;
  font: inherit; font-weight: 600; font-size: 0.95rem; color: var(--ink);
  background: none; border: 0; padding: 8px 8px 8px 0; min-height: 44px; cursor: pointer;
}
.back:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; border-radius: 6px; }
.progress { flex: 1; display: flex; align-items: center; gap: 10px; }
.progress-track { flex: 1; height: 8px; border: 1.5px solid var(--ink); border-radius: 99px; overflow: hidden; background: var(--surface); }
.progress-fill { height: 100%; width: 0; background: var(--green); transition: width 0.3s ease; }
.progress-label { font-size: 0.85rem; color: var(--ink-soft); white-space: nowrap; }

.screen { flex: 1; display: flex; flex-direction: column; }
.screen-body { flex: 1; padding: 24px 0 8px; }
h1, h2 { text-wrap: balance; }
.screen-body > h2 {
  font-stretch: 115%; font-weight: 800; font-size: 1.75rem; line-height: 1.1; letter-spacing: -0.01em; margin: 0 0 10px;
}
.screen-body > h2:focus, .screen-body > h1:focus { outline: none; }
.screen-sub { margin: 0 0 22px; color: var(--ink-soft); }
.screen-body > h2 + .row, .screen-body > h2 + .field { margin-top: 22px; }

/* The main button stays in thumb reach at the bottom of the screen. */
.actions {
  position: sticky; bottom: 0; z-index: 4;
  padding: 14px 0 calc(14px + env(safe-area-inset-bottom));
  background: linear-gradient(to bottom, rgba(244, 247, 245, 0) 0, var(--paper) 18px);
}

@media (prefers-reduced-motion: no-preference) {
  .screen.enter-fwd .screen-body { animation: in-fwd 0.28s ease-out; }
  .screen.enter-back .screen-body { animation: in-back 0.28s ease-out; }
  @keyframes in-fwd { from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: none; } }
  @keyframes in-back { from { opacity: 0; transform: translateX(-24px); } to { opacity: 1; transform: none; } }
}

/* ---------- welcome ---------- */
.screen-welcome .screen-body { padding-top: 12vh; }
.hero-quote {
  font-family: var(--hand);
  font-size: 1.6rem;
  color: var(--pen);
  margin: 0 0 4px;
  transform: rotate(-1.5deg);
  transform-origin: left;
}
.screen-welcome h1 {
  font-stretch: 118%;
  font-weight: 800;
  font-size: clamp(2.5rem, 11vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.hero-sub { margin: 0 0 24px; color: var(--ink-soft); font-size: 1.05rem; }
.welcome-points, .inside { margin: 0; padding: 0; list-style: none; }
.welcome-points li, .inside li { position: relative; padding: 7px 0 7px 28px; }
.welcome-points li::before, .inside li::before {
  content: ''; position: absolute; left: 2px; top: 13px; width: 14px; height: 8px;
  border-left: 2.5px solid var(--green); border-bottom: 2.5px solid var(--green); transform: rotate(-45deg);
}

/* ---------- form controls ---------- */
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
legend, .field > span {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 8px;
  padding: 0;
}
legend small, .field > span small { display: block; font-weight: 400; color: var(--ink-soft); font-size: 0.88rem; margin-top: 2px; }
.row { margin-bottom: 24px; }
.field { display: block; min-width: 0; margin-bottom: 22px; }
.field-narrow { max-width: 220px; }

input[type='number'], input[type='text'], input[type='email'] {
  width: 100%;
  font: inherit;
  font-size: 1.15rem;
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  min-height: 52px;
  appearance: textfield;
  -moz-appearance: textfield;
}
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px rgba(31, 122, 90, 0.18); }
input[aria-invalid='true'] { border-color: var(--err); }
input::placeholder { color: #9aaba4; }

.unit, .pair label { position: relative; display: block; }
.unit em, .pair em {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  font-style: normal; color: var(--ink-soft); font-size: 0.95rem; pointer-events: none;
}
.unit input, .pair input { padding-right: 44px; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; border: 1.5px solid var(--ink); border-radius: 8px; overflow: hidden; background: var(--surface); }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span { display: flex; align-items: center; justify-content: center; padding: 10px 12px; text-align: center; font-weight: 600; cursor: pointer; min-height: 50px; }
.seg label + label span { border-left: 1.5px solid var(--ink); }
.seg input:checked + span { background: var(--ink); color: #fff; }
.seg input:focus-visible + span { outline: 3px solid var(--green); outline-offset: -5px; }

.activity { display: grid; gap: 10px; }
.activity label {
  display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; align-items: start;
  border: 1.5px solid var(--line); border-radius: 8px; padding: 13px 14px; cursor: pointer; background: var(--surface);
}
.activity input { margin: 4px 0 0; width: 20px; height: 20px; accent-color: var(--green); grid-row: span 2; }
.activity b { font-weight: 700; }
.activity small { color: var(--ink-soft); font-size: 0.9rem; grid-column: 2; }
.activity label:has(input:checked) { border-color: var(--green); background: #eef6f2; box-shadow: inset 0 0 0 1px var(--green); }
.activity label:has(input:focus-visible) { outline: 3px solid var(--green); outline-offset: 2px; }

.check { display: flex; gap: 12px; align-items: center; font-weight: 600; cursor: pointer; padding: 6px 0; }
.check input { width: 22px; height: 22px; accent-color: var(--green); }

.err { color: var(--err); font-size: 0.9rem; margin: 6px 0 0; }
.err:empty { display: none; }

/* ---------- buttons ---------- */
.btn {
  display: block; width: 100%;
  font: inherit; font-weight: 800; font-stretch: 112%; font-size: 1.15rem;
  color: #fff; background: var(--green);
  border: 1.5px solid var(--ink); border-radius: 8px;
  padding: 15px 18px; min-height: 56px; cursor: pointer;
  box-shadow: 3px 3px 0 var(--ink);
}
.btn:hover { background: var(--green-deep); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn:focus-visible { outline: 3px solid var(--marker); outline-offset: 3px; }
.btn[disabled] { opacity: 0.6; cursor: progress; }
.btn-quiet { color: var(--ink); background: var(--surface); }
.btn-quiet:hover { background: #eef6f2; }

.link-btn {
  display: inline-block; font: inherit; font-weight: 600; color: var(--green-deep);
  background: none; border: 0; padding: 10px 0; min-height: 44px; cursor: pointer;
  text-decoration: underline; text-underline-offset: 3px;
}
.link-btn:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; border-radius: 4px; }

/* ---------- results ---------- */
.answer { margin: 10px 0 20px; }
.answer-cal { margin: 0 0 14px; font-size: 1.15rem; font-weight: 600; }
.answer-cal .hl {
  display: inline-block;
  font-size: clamp(2.6rem, 13vw, 3.4rem); font-stretch: 118%; font-weight: 800; line-height: 1.1; margin-right: 4px;
}

.hl {
  background: linear-gradient(transparent 14%, var(--marker) 14%, var(--marker) 88%, transparent 88%);
  padding: 0 4px; margin: 0 -4px;
  border-radius: 3px;
}

.macros { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.macro { border: 1.5px solid var(--ink); border-radius: 8px; padding: 10px 10px 8px; background: var(--surface); }
.macro b { display: block; font-size: 1.5rem; font-stretch: 112%; font-weight: 800; line-height: 1.1; }
.macro span { font-size: 0.85rem; color: var(--ink-soft); }

.notes p {
  background: #fff8d6; border: 1.5px solid #e6cf52; border-radius: 8px; padding: 12px 14px; margin: 0 0 14px; font-size: 0.95rem;
}
.expect { margin: 0 0 18px; }
.expect p { margin: 0 0 8px; }

.math { margin: 0 0 22px; }
.math summary {
  cursor: pointer; font-weight: 700; padding: 14px 16px; min-height: 52px;
  background: var(--surface); border: 1.5px solid var(--ink); border-radius: 8px;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
.math summary::-webkit-details-marker { display: none; }
.math summary::after { content: '+'; font-size: 1.4rem; font-weight: 600; line-height: 1; }
.math[open] summary::after { content: '\2212'; }
.math[open] summary { border-bottom-left-radius: 0; border-bottom-right-radius: 0; border-bottom-style: dashed; }
.math summary:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; }

.sheet {
  background: var(--surface);
  border: 1.5px solid var(--ink); border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 4px 16px 12px;
}
.step { padding: 14px 0; border-bottom: 1px solid var(--grid); }
.step:last-child { border-bottom: 0; }
.step h3 { font-size: 1rem; margin: 0 0 2px; font-weight: 700; }
.step .why { margin: 0 0 8px; color: var(--ink-soft); font-size: 0.92rem; }
.eq { display: grid; grid-template-columns: 1fr auto; gap: 2px 14px; }
.eq .lbl { color: var(--ink-soft); }
.eq .val { text-align: right; font-weight: 600; white-space: nowrap; }
.eq .rule { grid-column: 1 / -1; border-top: 2px solid var(--ink); margin: 4px 0 2px; }
.eq .ans-lbl { font-weight: 700; }
.eq .ans { font-weight: 800; font-size: 1.3rem; font-stretch: 112%; }
.margin-note {
  font-family: var(--hand); font-size: 1.3rem; line-height: 1.15; color: var(--pen);
  margin: 8px 0 0; transform: rotate(-0.8deg); transform-origin: left;
}

@media (prefers-reduced-motion: no-preference) {
  .math[open] .step { opacity: 0; animation: write 0.4s ease-out forwards; }
  .math[open] .step:nth-child(2) { animation-delay: 0.25s; }
  .math[open] .step:nth-child(3) { animation-delay: 0.5s; }
  .math[open] .step:nth-child(4) { animation-delay: 0.75s; }
  .math[open] .step:nth-child(5) { animation-delay: 1s; }
  @keyframes write { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
}

/* Step counter (affiliate) */
.tool {
  border: 1.5px dashed var(--ink-soft); border-radius: var(--radius);
  padding: 16px 16px; margin-bottom: 22px; background: rgba(255, 255, 255, 0.75);
}
.tool h3 { margin: 0 0 6px; font-size: 1.05rem; }
.tool p { margin: 0 0 10px; font-size: 0.95rem; color: var(--ink-soft); }
.tool-link { color: var(--green-deep); font-weight: 700; text-underline-offset: 3px; display: inline-block; padding: 4px 0; }
.tool-link:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; border-radius: 3px; }
.tool .disclosure { font-size: 0.8rem; margin: 8px 0 0; }

/* ---------- offer ---------- */
.inside { margin-bottom: 26px; }
.inside li { border-bottom: 1px solid var(--grid); font-size: 0.97rem; padding-top: 9px; padding-bottom: 9px; }
.fine { font-size: 0.82rem; color: var(--ink-soft); margin: 4px 0 0; }
.fine a { color: inherit; text-underline-offset: 2px; }
.form-status { margin: 0 0 14px; font-weight: 600; }
.form-status:empty { display: none; }
.form-status.bad { color: var(--err); }

/* ---------- sent ---------- */
.sent-h { font-size: 1.05rem; margin: 26px 0 8px; }
.next-steps { margin: 0; padding-left: 1.3em; }
.next-steps li { padding: 5px 0; }
.next-steps li::marker { font-weight: 800; color: var(--green); }
.next-steps .tool-link { padding: 0; }
[data-screen='sent'] .disclosure { font-size: 0.8rem; color: var(--ink-soft); margin: 14px 0 0; }

.foot { padding: 8px 0 28px; font-size: 0.8rem; color: var(--ink-soft); }

/* Only shown on the test site */
.test-banner {
  margin: 0; padding: 8px 16px; text-align: center;
  background: var(--marker); color: var(--ink); font-size: 0.85rem; font-weight: 600;
  border-bottom: 1.5px solid var(--ink);
}

/* ---------- plain text pages (privacy) ---------- */
a.back { text-decoration: none; }
.doc { padding: 24px 0 48px; }
.doc h1 {
  font-stretch: 115%; font-weight: 800; font-size: clamp(2rem, 9vw, 2.6rem);
  line-height: 1.05; letter-spacing: -0.01em; margin: 0 0 6px;
}
.doc-date { color: var(--ink-soft); font-size: 0.9rem; margin: 0 0 20px; }
.doc-card {
  background: var(--surface);
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 5px 5px 0 var(--ink);
  padding: 20px 18px 8px;
}
.doc-lede { font-size: 1.05rem; margin-top: 0; }
.doc-card h2 { font-size: 1.05rem; margin: 24px 0 6px; padding-top: 18px; border-top: 1px solid var(--grid); }
.doc-card p, .doc-card li { font-size: 0.97rem; }
.doc-card ul { padding-left: 1.2em; margin: 0 0 14px; }
.doc-card li { margin-bottom: 7px; }
.doc-card li::marker { color: var(--green); }
.doc-card a { color: var(--green-deep); font-weight: 600; text-underline-offset: 3px; }
.foot a { color: inherit; text-underline-offset: 3px; }