/* CoverCalc — prepress / print-shop aesthetic.
   The palette IS the template legend: trim red, safe cyan, spine amber, paper cream. */
:root {
  --paper: #f6f1e6;
  --sheet: #fffdf7;
  --ink: #17130e;
  --muted: #6d6353;
  --line: #d9cfbc;
  --trim-red: #c8371f;
  --safe-cyan: #0e7c90;
  --spine-amber: #b97f10;
  --amber-bg: #f9efd8;
  --red-bg: #f8e2dd;
  --cyan-bg: #e0eef1;
  --serif: "Fraunces", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, Segoe UI, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--paper);
  background-image: radial-gradient(rgba(23,19,14,.05) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
}
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* header */
header.site {
  border-bottom: 2px solid var(--ink);
  background: var(--sheet);
  position: sticky; top: 0; z-index: 50;
}
header.site .wrap { display: flex; align-items: center; gap: 28px; height: 60px; }
@media (max-width: 720px) {
  header.site .wrap { height: auto; flex-direction: column; align-items: flex-start; gap: 4px; padding: 10px 16px 8px; }
  header.site .logo { font-size: 1.15rem; white-space: nowrap; }
  nav.main { margin-left: 0; width: 100%; overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; }
  nav.main a { white-space: nowrap; padding: 5px 8px; font-size: .82rem; }
}
.logo { font-family: var(--serif); font-weight: 700; font-size: 1.35rem; text-decoration: none; color: var(--ink); letter-spacing: -.02em; }
.logo .tick { color: var(--trim-red); }
nav.main { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
nav.main a {
  color: var(--muted); text-decoration: none; font-size: .86rem;
  padding: 6px 10px; border-radius: 3px; letter-spacing: .01em;
}
nav.main a:hover, nav.main a.on { color: var(--ink); background: var(--paper); }

/* hero */
.hero { padding: 46px 0 8px; }
.hero .kicker {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--trim-red);
}
.hero h1 {
  font-family: var(--serif); font-size: clamp(1.9rem, 4.2vw, 3rem);
  line-height: 1.12; letter-spacing: -.02em; margin: 10px 0 14px; font-weight: 600;
}
.hero p.lede { max-width: 62ch; color: var(--muted); font-size: 1.02rem; }

/* crop-marked cards */
.card {
  background: var(--sheet);
  border: 1px solid var(--line);
  position: relative;
  padding: 26px;
}
.card::before, .card::after,
.card .cm::before, .card .cm::after {
  content: ""; position: absolute; width: 14px; height: 14px; pointer-events: none;
}
.card::before { top: -1px; left: -1px; border-top: 2px solid var(--ink); border-left: 2px solid var(--ink); }
.card::after { top: -1px; right: -1px; border-top: 2px solid var(--ink); border-right: 2px solid var(--ink); }
.card .cm::before { bottom: -1px; left: -1px; border-bottom: 2px solid var(--ink); border-left: 2px solid var(--ink); }
.card .cm::after { bottom: -1px; right: -1px; border-bottom: 2px solid var(--ink); border-right: 2px solid var(--ink); }

/* tool grid */
.tool { display: grid; grid-template-columns: 360px 1fr; gap: 22px; margin: 30px 0 14px; align-items: start; }
@media (max-width: 900px) { .tool { grid-template-columns: 1fr; } }

.field { margin-bottom: 18px; }
.field label {
  display: block; font-family: var(--mono); font-size: .72rem;
  letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px;
}
.field select, .field input[type=number], .field input[type=email], .field input[type=text] {
  width: 100%; padding: 10px 12px; font-size: .95rem; font-family: var(--sans);
  border: 1px solid var(--ink); border-radius: 0; background: var(--sheet); color: var(--ink);
}
.field select:focus, .field input:focus { outline: 2px solid var(--safe-cyan); outline-offset: 1px; }
.seg { display: flex; border: 1px solid var(--ink); }
.seg button {
  flex: 1; padding: 10px 6px; background: var(--sheet); border: 0; cursor: pointer;
  font-family: var(--sans); font-size: .92rem; color: var(--muted);
}
.seg button + button { border-left: 1px solid var(--ink); }
.seg button.on { background: var(--ink); color: var(--sheet); font-weight: 600; }
.custom-trim { display: none; gap: 10px; }
.custom-trim.show { display: flex; }
.hint { font-size: .78rem; color: var(--muted); margin-top: 5px; }
.err {
  display: none; background: var(--red-bg); border-left: 3px solid var(--trim-red);
  color: #7c2114; padding: 10px 12px; font-size: .86rem; margin-top: 8px;
}
.err.show { display: block; }

/* results */
.readouts { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-bottom: 18px; }
@media (max-width: 560px) { .readouts { grid-template-columns: 1fr; } }
.readout { background: var(--sheet); padding: 14px 16px; }
.readout .k { font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.readout .v { font-family: var(--mono); font-size: 1.42rem; font-weight: 600; margin-top: 2px; letter-spacing: -.02em; }
.readout .v small { font-size: .78rem; color: var(--muted); font-weight: 400; display: block; }
.readout.spine .v { color: var(--spine-amber); }
.readout.full .v { color: var(--trim-red); }

#preview svg { width: 100%; height: auto; display: block; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 10px; font-size: .78rem; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 14px; height: 10px; display: inline-block; border: 1px solid rgba(0,0,0,.2); }

.btnrow { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.btn {
  display: inline-block; padding: 12px 20px; font-size: .95rem; font-weight: 600;
  font-family: var(--sans); border: 1px solid var(--ink); cursor: pointer;
  background: var(--sheet); color: var(--ink); text-decoration: none;
  box-shadow: 3px 3px 0 var(--ink); transition: transform .08s, box-shadow .08s;
}
.btn:hover { transform: translate(1px, 1px); box-shadow: 2px 2px 0 var(--ink); }
.btn:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--ink); }
.btn.primary { background: var(--trim-red); border-color: var(--trim-red); color: #fff; box-shadow: 3px 3px 0 var(--ink); }
.btn.ghost { box-shadow: none; border-style: dashed; font-weight: 400; }

/* detail table */
table.dims { width: 100%; border-collapse: collapse; font-size: .9rem; margin-top: 6px; }
table.dims th, table.dims td { text-align: left; padding: 9px 10px; border-bottom: 1px dashed var(--line); }
table.dims th { font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
table.dims td.num { font-family: var(--mono); }
table.dims tr td:first-child { color: var(--ink); }

/* sections */
section.band { margin: 44px 0; }
section.band h2 { font-family: var(--serif); font-size: 1.7rem; font-weight: 600; letter-spacing: -.01em; margin-bottom: 6px; }
section.band .sub { color: var(--muted); max-width: 68ch; margin-bottom: 18px; }
.rule { border: 0; border-top: 1px dashed var(--line); margin: 40px 0; }

/* callout */
.callout { border-left: 3px solid var(--safe-cyan); background: var(--cyan-bg); padding: 18px 20px; }
.callout strong { font-family: var(--serif); }

/* compare */
.comparebar { display: flex; gap: 10px; flex-wrap: wrap; align-items: end; margin-bottom: 12px; }
.comparebar .field { margin: 0; flex: 1; min-width: 220px; }

/* email */
.subscribe { display: grid; grid-template-columns: 1.2fr 1fr; gap: 26px; align-items: center; }
@media (max-width: 760px) { .subscribe { grid-template-columns: 1fr; } }
.subscribe form { display: flex; gap: 10px; }
.subscribe input[type=email] { flex: 1; padding: 12px; border: 1px solid var(--ink); background: #fff; font-size: .95rem; }
.sub-ok { display: none; color: var(--safe-cyan); font-weight: 600; margin-top: 8px; }

/* recs */
.recs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 820px) { .recs { grid-template-columns: 1fr; } }
.rec { background: var(--sheet); border: 1px solid var(--line); padding: 20px; }
.rec h3 { font-family: var(--serif); font-size: 1.1rem; margin-bottom: 6px; }
.rec p { font-size: .87rem; color: var(--muted); margin-bottom: 12px; }
.rec a { color: var(--safe-cyan); font-weight: 600; font-size: .9rem; }

/* faq */
.faq details { border-bottom: 1px dashed var(--line); padding: 4px 0; }
.faq summary {
  cursor: pointer; font-weight: 600; padding: 12px 0; list-style: none;
  display: flex; justify-content: space-between; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--trim-red); }
.faq details[open] summary::after { content: "\2013"; }
.faq .a { padding: 0 0 16px; color: var(--muted); max-width: 75ch; }
.faq .a code { font-family: var(--mono); font-size: .85em; background: var(--amber-bg); padding: 1px 5px; }

/* prose pages */
.prose { max-width: 760px; }
.prose h1 { font-family: var(--serif); font-size: clamp(1.7rem, 3.6vw, 2.5rem); line-height: 1.15; margin: 40px 0 14px; letter-spacing: -.02em; }
.prose h2 { font-family: var(--serif); font-size: 1.45rem; margin: 34px 0 10px; }
.prose h3 { font-size: 1.05rem; margin: 22px 0 8px; }
.prose p, .prose ul, .prose ol { margin-bottom: 14px; color: #3d372e; }
.prose li { margin-left: 20px; margin-bottom: 6px; }
.prose table { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 14px 0 20px; background: var(--sheet); }
.prose table th, .prose table td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose table th { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; background: var(--amber-bg); }
.prose table td.num, .prose td.mono { font-family: var(--mono); }
.prose a { color: var(--safe-cyan); }
.prose .toolcta {
  border: 1px solid var(--ink); background: var(--sheet); padding: 16px 18px; margin: 20px 0;
  box-shadow: 3px 3px 0 var(--ink);
}

/* footer */
footer.site { border-top: 2px solid var(--ink); margin-top: 60px; background: var(--sheet); }
footer.site .wrap { padding: 30px 20px; display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; font-size: .84rem; color: var(--muted); }
footer.site a { color: var(--muted); }
footer.site .cols { display: flex; gap: 40px; flex-wrap: wrap; }
footer.site .cols div { display: flex; flex-direction: column; gap: 6px; }
footer.site .cols b { color: var(--ink); font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; }

/* util */
.mono { font-family: var(--mono); }
.mt0 { margin-top: 0; }
.small { font-size: .8rem; color: var(--muted); }