/* Layout concept: a workshop manual's index. Blueprint-navy cover band, then ruled spec sheets on pale technical paper. */
:root {
  --navy: #0b2f6e;
  --navy-deep: #081f4a;
  --grid: rgba(255, 255, 255, .07);
  --paper: #eef2f7;
  --sheet: #ffffff;
  --ink: #101c30;
  --muted: #526078;
  --rule: #cdd6e3;
  --signal: #d3202a;
  --signal-dark: #b01620;
  --on-navy: #ffffff;
  --on-navy-soft: #c6d4ec;
  --display: "Barlow Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
  --body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

a { color: var(--navy); }
a:focus-visible, .btn:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; }
img { display: block; max-width: 100%; height: auto; }

/* Top bar */
.top { background: var(--navy-deep); color: var(--on-navy); }
.top .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; padding-block: 14px; }
.brand { color: var(--on-navy); font-family: var(--display); font-size: 25px; font-weight: 700; letter-spacing: .01em; text-decoration: none; }
.brand b { color: #ff6b73; font-weight: 700; }
.top nav { display: flex; gap: 20px; }
.top nav a { color: var(--on-navy-soft); font-size: 15px; text-decoration: none; }
.top nav a:hover { color: var(--on-navy); text-decoration: underline; }

/* Blueprint cover band */
.cover {
  background-color: var(--navy);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--on-navy);
}
.cover .wrap { padding-block: 56px 60px; }
.cover .eyebrow { margin: 0 0 12px; color: var(--on-navy-soft); font-family: var(--mono); font-size: 14px; letter-spacing: .04em; }
.cover h1 {
  max-width: 17ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(44px, 8vw, 80px);
  font-weight: 700;
  line-height: 1;
  text-wrap: balance;
}
.cover .lead { max-width: 60ch; margin: 20px 0 0; color: var(--on-navy-soft); font-size: 19px; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 40px; align-items: center; }
.split img { border: 1px solid rgba(255, 255, 255, .28); }
@media (max-width: 860px) { .split { grid-template-columns: minmax(0, 1fr); gap: 28px; } }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--signal);
  color: #fff;
  font-family: var(--display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.2;
  padding: 12px 24px;
  text-align: center;
  text-decoration: none;
}
.btn:hover { background: var(--signal-dark); }
.btn.small { font-size: 18px; padding: 8px 16px; white-space: nowrap; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 28px; }
.price { font-family: var(--display); font-size: 38px; font-weight: 700; line-height: 1; }
.price small { font-family: var(--mono); font-size: 14px; font-weight: 400; }

/* Sections */
section.block { padding-block: 52px; }
section.block + section.block { padding-top: 0; }
h2 { margin: 0 0 8px; font-family: var(--display); font-size: 38px; font-weight: 700; line-height: 1.1; text-wrap: balance; }
.sub { max-width: 65ch; margin: 0 0 24px; color: var(--muted); }

/* Manual index */
.index { width: 100%; border-collapse: collapse; background: var(--sheet); border: 1px solid var(--rule); }
.index th { background: var(--navy-deep); color: var(--on-navy); font-family: var(--mono); font-size: 13px; font-weight: 500; letter-spacing: .03em; padding: 10px 16px; text-align: left; }
.index td { border-top: 1px solid var(--rule); padding: 16px; vertical-align: middle; }
.index .ref { color: var(--muted); font-family: var(--mono); font-size: 14px; white-space: nowrap; }
.index .name { display: block; font-family: var(--display); font-size: 24px; font-weight: 600; line-height: 1.15; }
.index .name a { color: var(--ink); text-decoration: none; }
.index .name a:hover { color: var(--signal-dark); text-decoration: underline; }
.index .note { color: var(--muted); font-size: 15px; }
.index .cost { font-family: var(--mono); font-size: 15px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.index td:last-child { text-align: right; }

@media (max-width: 720px) {
  .index, .index tbody, .index tr, .index td { display: block; width: 100%; }
  .index thead { display: none; }
  .index tr { padding: 16px; border-top: 1px solid var(--rule); }
  .index tr:first-child { border-top: 0; }
  .index td { border: 0; padding: 3px 0; text-align: left; }
  .index td:last-child { padding-top: 12px; text-align: left; }
}

/* How it works */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { background: var(--sheet); border: 1px solid var(--rule); padding: 18px 20px; counter-increment: step; }
.steps li::before { content: "Paso " counter(step); display: block; color: var(--signal-dark); font-family: var(--mono); font-size: 13px; margin-bottom: 4px; }
.steps strong { display: block; font-family: var(--display); font-size: 23px; font-weight: 600; line-height: 1.2; margin-bottom: 4px; }
@media (max-width: 780px) { .steps { grid-template-columns: minmax(0, 1fr); } }

/* Spec plate */
.spec { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; background: var(--sheet); border: 1px solid var(--rule); }
.spec div { border-left: 1px solid var(--rule); padding: 14px 18px; }
.spec div:first-child { border-left: 0; }
.spec dt { color: var(--muted); font-family: var(--mono); font-size: 13px; }
.spec dd { margin: 2px 0 0; font-family: var(--display); font-size: 24px; font-weight: 600; line-height: 1.2; }
@media (max-width: 780px) {
  .spec { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec div:nth-child(odd) { border-left: 0; }
  .spec div:nth-child(n+3) { border-top: 1px solid var(--rule); }
}

.columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; }
.columns > * { min-width: 0; }
@media (max-width: 780px) { .columns { grid-template-columns: minmax(0, 1fr); gap: 24px; } }
.checklist { margin: 0; padding: 0; list-style: none; }
.checklist li { border-top: 1px solid var(--rule); padding: 8px 0; }
.checklist li:last-child { border-bottom: 1px solid var(--rule); }

/* Sample pages */
.samples { display: grid; gap: 28px; margin: 0; }
.samples figure { margin: 0; background: var(--sheet); border: 1px solid var(--rule); }
.samples figcaption { color: var(--muted); font-size: 15px; padding: 10px 16px; }
.samples figcaption strong { color: var(--ink); }

/* Questions */
.faq details { background: var(--sheet); border: 1px solid var(--rule); border-top: 0; padding: 14px 18px; }
.faq details:first-child { border-top: 1px solid var(--rule); }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { max-width: 65ch; margin: 8px 0 0; color: var(--muted); }

/* Closing strip */
.closing { background: var(--navy-deep); color: var(--on-navy); }
.closing .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 32px; padding-block: 32px; }
.closing h2 { margin: 0; font-size: 32px; }

footer { color: var(--muted); font-size: 14px; }
footer .wrap { padding-block: 28px; }
footer p { max-width: 75ch; margin: 0 0 8px; }