:root {
  color-scheme: light;
  --ink: #1b2520;
  --muted: #5f6e65;
  --line: #dce4de;
  --green: #176047;
  --green-light: #edf6f0;
  --red: #a1392a;
  --red-light: #fff3ee;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #ffffff;
}
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 1136px; padding: 28px 48px 24px; margin: auto; }
a { color: var(--green); text-underline-offset: 4px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
button, input { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, a:focus-visible { outline: 3px solid #76aa90; outline-offset: 4px; }
[hidden] { display: none !important; }
code, output { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
code { font-size: .9em; }
.brand { display: flex; gap: 12px; align-items: center; font-size: 18px; font-weight: 650; }
.brand img { object-fit: contain; flex: 0 0 auto; }
.brand-separator { color: #a4b0a8; margin: 0 8px; font-weight: 400; }
.brand-label { font-weight: 450; }
.brand a { margin-left: auto; font-size: 13px; font-weight: 500; }
.intro { padding: 58px 0 32px; max-width: 730px; }
h1 { font-size: clamp(32px, 4.5vw, 50px); line-height: 1.06; letter-spacing: -.045em; margin: 0 0 20px; font-weight: 650; }
p { font-size: 16px; line-height: 1.6; margin: 0 0 12px; }
.intro > p { max-width: 650px; color: var(--muted); }
.intro .boundary { font-size: 12px; color: var(--muted); margin-top: 18px; }
.lab { display: grid; grid-template-columns: 285px minmax(0, 1fr); border-block: 1px solid var(--line); }
.controls { padding: 28px 26px 28px 0; border-right: 1px solid var(--line); }
h2 { font-size: 21px; letter-spacing: -.025em; line-height: 1.25; margin: 0 0 9px; font-weight: 630; }
.section-note, .field-help { font-size: 12px; color: var(--muted); }
.section-note { margin-bottom: 21px; }
.dimensions { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.dimensions label { font-size: 12px; font-weight: 600; }
.dimensions input { display: block; margin-top: 8px; width: 100%; border: 1px solid #b8c7bd; border-radius: 7px; background: #fff; padding: 10px 8px; font-size: 19px; color: var(--ink); }
.field-help { margin-top: 8px; line-height: 1.5; }
.presets { display: flex; gap: 6px; margin: 16px 0 29px; flex-wrap: wrap; }
.presets button { font-size: 11px; padding: 7px 9px; background: white; border: 1px solid var(--line); border-radius: 5px; color: var(--muted); }
.presets button:hover { border-color: var(--green); color: var(--green); }
fieldset { border: 0; padding: 0; margin: 0; }
legend { font-size: 12px; font-weight: 650; margin-bottom: 10px; }
.mode { display: flex; align-items: flex-start; gap: 9px; padding: 12px 7px; border-bottom: 1px solid var(--line); font-size: 12px; line-height: 1.4; cursor: pointer; }
.mode:has(input:checked) { background: var(--green-light); border-color: transparent; border-radius: 6px; }
.mode input { accent-color: var(--green); margin: 2px 0 0; flex: 0 0 auto; }
.mode strong { display: block; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 11px; font-weight: 500; margin-top: 5px; color: var(--muted); }
.reset { border: 0; background: none; padding: 0; color: var(--muted); text-decoration: underline; text-underline-offset: 4px; margin-top: 22px; font-size: 12px; }
.results { padding: 19px 0 26px 30px; min-width: 0; }
.flow { list-style: none; padding: 0; margin: 0; }
.flow li { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
.flow li > div { display: flex; gap: 11px; align-items: baseline; }
.step { color: #89988e; font-size: 10px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.flow small { display: block; color: var(--muted); font-size: 11px; line-height: 1.5; margin-top: 3px; }
.flow output { font-size: 12px; white-space: nowrap; }
.flow .mismatch output { color: var(--red); font-weight: 600; }
.flow .match output { color: var(--green); font-weight: 600; }
.verdict { padding: 18px 20px; margin-top: 20px; border-radius: 8px; }
.verdict.mismatch { background: var(--red-light); }
.verdict.match { background: var(--green-light); }
h3 { margin: 0 0 8px; font-size: 16px; line-height: 1.4; font-weight: 650; }
.verdict p { font-size: 12px; line-height: 1.55; }
.matrix { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; padding: 11px 0 2px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.matrix span:nth-child(1), .matrix span:nth-child(3) { font-size: 20px; letter-spacing: -.04em; }
.matrix span:last-child { font-size: 11px; color: var(--muted); }
.matrix-note { color: var(--muted); margin-top: 5px; }
.error { display: block; font-size: 11px; line-height: 1.6; color: var(--red); overflow-wrap: anywhere; margin-top: 10px; }
.mode-note { font-size: 12px; color: var(--muted); margin: 14px 0 0; }
.invalid { padding: 18px; border-left: 3px solid var(--red); background: var(--red-light); color: var(--red); font-size: 14px; }
.reshape-section { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; padding: 38px 0; border-bottom: 1px solid var(--line); }
.reshape-section p, .takeaway p { font-size: 14px; color: var(--muted); }
.reshape-section .field-help { font-size: 11px; }
.reshape-result { align-self: center; background: #f5f7f5; padding: 22px; border-radius: 8px; }
.reshape-result p { font-size: 13px; }
.reshape-result strong { color: var(--ink); }
.reshape-flow { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.reshape-flow code { font-size: 20px; color: var(--ink); }
.reshape-flow span { font-size: 11px; }
.takeaway { max-width: 800px; padding: 32px 0 28px; }
.resource-links { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 22px; font-size: 13px; }
footer { border-top: 1px solid var(--line); padding-top: 17px; color: var(--muted); font-size: 11px; line-height: 1.6; }
.skip-link { position: absolute; left: 12px; top: -100px; background: #fff; padding: 10px; z-index: 1; }
.skip-link:focus { top: 10px; }
@media (max-width: 760px) {
  main { padding: 22px 24px; }
  .brand a { display: none; }
  .intro { padding-top: 40px; }
  .lab { grid-template-columns: 1fr; }
  .controls { border-right: 0; border-bottom: 1px solid var(--line); padding-right: 0; }
  .dimensions { max-width: 380px; }
  .presets { margin-bottom: 24px; }
  .results { padding-left: 0; padding-top: 12px; }
  .reshape-section { grid-template-columns: 1fr; gap: 10px; padding: 30px 0; }
}
@media (max-width: 390px) {
  main { padding: 18px 18px; }
  .brand { font-size: 16px; }
  .brand-separator { margin: 0 4px; }
  h1 { font-size: 32px; }
  .flow li { align-items: flex-start; flex-direction: column; gap: 7px; }
  .flow output { padding-left: 25px; }
  .verdict { padding: 16px; }
}