/* Vesterde — hoja de estilos común */

:root {
  --bg: #f4f5f7;
  --bg-alt: #ffffff;
  --bg-dark: #23262b;
  --ink: #16181d;
  --ink-soft: #656b75;
  --ink-invert: #f4f5f7;
  --accent: #2d5bd6;
  --accent-2: #c9a00f;
  --rule: #d7dae0;
  --rule-dark: #3c414a;
  --step: 84px;
  --gap: 28px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration: none; }

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- rejilla base ---------- */

.wrap {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 32px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--gap);
}

.col-main { grid-column: 1 / span 7; min-width: 0; }
.col-wide { grid-column: 1 / span 8; min-width: 0; }
.col-lead { grid-column: 1 / span 6; min-width: 0; }
.col-index { grid-column: 10 / span 3; min-width: 0; }

/* ---------- cabecera ---------- */

.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}

.site-head .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.brand span { color: var(--accent-2); }

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin: 0;
  padding: 0;
}

.site-nav a {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ---------- hero ---------- */

.hero { padding: 72px 0 var(--step); }

h1 {
  grid-column: 1 / span 8;
  margin: 0 0 26px;
  font-size: clamp(34px, 5.6vw, 60px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -0.035em;
}

.hero p.lead {
  grid-column: 1 / span 6;
  margin: 0;
  font-size: 19px;
  line-height: 1.65;
  color: #2b2f36;
}

.hero .lead + .lead { margin-top: 18px; }

/* ---------- columna-índice ---------- */

.index-col {
  grid-column: 10 / span 3;
  grid-row: 1 / span 3;
  align-self: start;
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

.index-col h2,
.index-col .index-title {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.index-col ol,
.index-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: idx;
}

.index-col li {
  font-size: 13px;
  line-height: 1.45;
  padding: 7px 0;
  border-bottom: 1px solid var(--rule);
}

.index-col ol li { counter-increment: idx; }

.index-col ol li::before {
  content: counter(idx, decimal-leading-zero);
  color: var(--accent-2);
  font-weight: 700;
  margin-right: 9px;
}

.index-col a { color: var(--ink); text-decoration: none; }
.index-col a:hover { color: var(--accent); text-decoration: underline; }

.index-col .index-note {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-soft);
  padding-top: 12px;
}

/* ---------- secciones ---------- */

.band { padding: var(--step) 0; }
.band--alt { background: var(--bg-alt); }

.sec { position: relative; }
.sec + .sec { margin-top: var(--step); }

.sec-num {
  grid-column: 10 / span 3;
  grid-row: 1;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  padding-top: 8px;
}

.sec h2 {
  grid-column: 1 / span 7;
  grid-row: 1;
  margin: 0 0 20px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: clamp(23px, 2.6vw, 30px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.sec > p,
.sec > ul,
.sec > ol,
.sec > .sub {
  grid-column: 1 / span 7;
  min-width: 0;
}

.sec p { margin: 0 0 18px; }
.sec p:last-child { margin-bottom: 0; }

.sub { margin-top: 26px; }
.sub h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.sub p { margin: 0 0 14px; }
.sub p:last-child { margin-bottom: 0; }

/* listas */

.sec ul,
.sub ul {
  margin: 0 0 18px;
  padding-left: 20px;
}

.sec ul li,
.sub ul li { margin-bottom: 9px; }

.sec ul li::marker,
.sub ul li::marker { color: var(--accent); }

ol.steps {
  margin: 0 0 18px;
  padding-left: 0;
  list-style: none;
  counter-reset: st;
}

ol.steps li {
  counter-increment: st;
  position: relative;
  padding-left: 40px;
  margin-bottom: 12px;
}

ol.steps li::before {
  content: counter(st, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-2);
  line-height: 1.9;
}

.checklist {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.checklist li {
  padding: 10px 0 10px 26px;
  border-bottom: 1px solid var(--rule);
  position: relative;
  margin: 0;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--accent);
}

/* tabla de datos (colores de calentamiento) */

.datatable {
  grid-column: 1 / span 7;
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 0 0 18px;
}

.datatable caption {
  text-align: left;
  font-size: 13px;
  color: var(--ink-soft);
  padding-bottom: 10px;
}

.datatable th,
.datatable td {
  text-align: left;
  padding: 9px 14px 9px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

.datatable th {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--ink);
}

/* ---------- imagen principal ---------- */

.figure-main {
  grid-column: 1 / span 8;
  margin: 0;
  min-width: 0;
}

.figure-main img { width: 100%; }

.figure-main figcaption,
.figure-caption {
  grid-column: 10 / span 3;
  align-self: end;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-soft);
  border-top: 1px solid var(--accent-2);
  padding-top: 10px;
}

.figure-row { align-items: end; }

/* ---------- banda oscura ---------- */

.band--dark {
  background: var(--bg-dark);
  color: var(--ink-invert);
  padding: var(--step) 0;
}

.band--dark h2 {
  border-top-color: var(--rule-dark);
  color: var(--ink-invert);
}

.band--dark p { color: #d5d8de; }
.band--dark .sec-num { color: var(--accent-2); }
.band--dark a { color: #9db6f2; }

.band--dark .sub h3 { color: #ffffff; }

.dark-figure {
  grid-column: 8 / span 5;
  grid-row: 1 / span 4;
  margin: 0;
  align-self: start;
  min-width: 0;
}

.dark-figure img { width: 100%; }

.dark-figure figcaption {
  font-size: 13px;
  line-height: 1.5;
  color: #9aa1ad;
  border-top: 1px solid var(--rule-dark);
  padding-top: 10px;
  margin-top: 12px;
}

.band--dark .dark-text {
  grid-column: 1 / span 6;
  min-width: 0;
}

.dark-text h2 {
  margin: 0 0 18px;
  padding-top: 14px;
  border-top: 1px solid var(--rule-dark);
  font-size: clamp(23px, 2.6vw, 30px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.dark-text p { margin: 0 0 18px; }
.dark-text p:last-child { margin-bottom: 0; }
.dark-text ul { margin: 0 0 18px; padding-left: 20px; }
.dark-text ul li { margin-bottom: 9px; }

.band--dark .checklist { border-top-color: var(--rule-dark); }
.band--dark .checklist li { border-bottom-color: var(--rule-dark); }
.band--dark .checklist li::before { background: var(--accent-2); }
.band--dark ul li::marker { color: var(--accent-2); }

/* ---------- páginas interiores ---------- */

.page-head { padding: 64px 0 44px; }
.page-head h1 { grid-column: 1 / span 8; margin-bottom: 20px; font-size: clamp(30px, 4.4vw, 48px); }
.page-head p { grid-column: 1 / span 6; margin: 0; font-size: 18px; color: #2b2f36; }

.prose { padding-bottom: var(--step); }

.prose h2 {
  grid-column: 1 / span 7;
  margin: 44px 0 16px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: clamp(21px, 2.3vw, 27px);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.prose h2:first-of-type { margin-top: 0; }

.prose h3 {
  grid-column: 1 / span 7;
  margin: 26px 0 8px;
  font-size: 18px;
}

.prose p,
.prose ul,
.prose ol { grid-column: 1 / span 7; min-width: 0; }

.prose p { margin: 0 0 18px; }
.prose ul { margin: 0 0 18px; padding-left: 20px; }
.prose ul li { margin-bottom: 9px; }
.prose ul li::marker { color: var(--accent); }

.side-marks {
  grid-column: 10 / span 3;
  grid-row: 1 / span 40;
  align-self: start;
  position: sticky;
  top: 28px;
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

.side-marks p {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
}

.side-marks p b {
  display: block;
  color: var(--accent-2);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.side-marks p:last-child { border-bottom: none; }

/* ---------- contacto ---------- */

.contact-line {
  grid-column: 1 / span 7;
  margin: 0;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-size: 18px;
}

/* ---------- pie ---------- */

.site-foot {
  background: var(--bg);
  border-top: 1px solid var(--rule);
  padding: 46px 0 56px;
}

.foot-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px 32px;
  align-items: flex-start;
}

.foot-name {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.foot-name span { color: var(--accent-2); }

.foot-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  margin: 0;
  padding: 0;
}

.foot-nav a {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
}

.foot-nav a:hover { color: var(--accent); text-decoration: underline; }

.foot-rule {
  height: 1px;
  background: var(--rule);
  margin: 26px 0 20px;
}

.foot-mail { font-size: 16px; margin: 0 0 8px; }

.foot-note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0;
  max-width: 62ch;
}

/* ---------- adaptación ---------- */

@media (max-width: 900px) {
  :root { --step: 56px; --gap: 22px; }

  .wrap { padding: 0 22px; }

  .grid { display: block; }

  h1, .hero p.lead, .page-head h1, .page-head p,
  .sec h2, .sec > p, .sec > ul, .sec > ol, .sec > .sub,
  .figure-main, .dark-figure, .band--dark .dark-text,
  .prose h2, .prose h3, .prose p, .prose ul, .prose ol,
  .datatable, .contact-line, .sec-num,
  .figure-main figcaption, .figure-caption {
    grid-column: auto;
    grid-row: auto;
  }

  .index-col,
  .side-marks {
    grid-column: auto;
    grid-row: auto;
    position: static;
    margin: 0 0 34px;
    border-top: 2px solid var(--ink);
  }

  .hero { padding: 40px 0 var(--step); }
  .hero .index-col { margin-bottom: 30px; }

  .index-col ol,
  .index-col ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0 20px;
  }

  .index-col li { border-bottom: none; padding: 5px 0; }

  .index-col .index-note { border-top: 1px solid var(--rule); margin-top: 6px; }

  .side-marks p { border-bottom: none; padding: 6px 0; }

  .figure-main { margin-bottom: 16px; }
  .figure-main figcaption,
  .figure-caption { margin-top: 0; }

  .dark-figure { margin-bottom: 26px; max-width: 420px; }

  .sec-num { padding-top: 0; }

  .page-head { padding: 36px 0 30px; }

  .datatable { font-size: 14px; display: block; overflow-x: auto; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .wrap { padding: 0 18px; }
  .site-head .wrap { flex-direction: column; align-items: flex-start; }
  .hero p.lead { font-size: 17px; }
  ol.steps li { padding-left: 32px; }
}