/* Serdesiba — folha de estilos comum */

:root {
  --stone-1: #edeff1;
  --stone-2: #dee2e6;
  --stone-3: #d5dadf;
  --ink-dark: #1a1e22;
  --text: #15181c;
  --text-soft: #616770;
  --text-inv: #edeff1;
  --text-inv-soft: #a9b1b8;
  --accent: #b02a24;
  --accent-2: #3c6a86;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --pad-v: 88px;
  --pad-h: 52px;
  --maxw: 1340px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--stone-1);
  color: var(--text);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.9;
  overflow-x: hidden;
}

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

a { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

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

/* ---------- faixas e grelha ---------- */

.band { width: 100%; }

.grid {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--pad-v) var(--pad-h);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 28px;
  row-gap: 0;
}

.tone-a { background: var(--stone-1); }
.tone-b { background: var(--stone-2); }
.tone-c { background: var(--stone-3); }

.tone-dark {
  background: var(--ink-dark);
  color: var(--text-inv);
}

.tone-dark h2, .tone-dark h3 { color: var(--text-inv); }
.tone-dark .cap, .tone-dark .num { color: var(--text-inv-soft); }
.tone-dark a { color: #e5a09a; }
.tone-dark li::marker { color: #e5a09a; }
.tone-dark .lead-rule { background: var(--accent-2); }

/* degraus: cada secção entra mais uma coluna */
.s0 > .grid > * { grid-column: 1 / span 6; }
.s1 > .grid > * { grid-column: 2 / span 6; }
.s2 > .grid > * { grid-column: 3 / span 6; }
.s3 > .grid > * { grid-column: 4 / span 6; }

/* ---------- tipografia ---------- */

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: normal;
  line-height: 1.3;
  margin: 0;
}

h1 { font-size: clamp(34px, 4.4vw, 58px); }
h2 { font-size: clamp(26px, 2.6vw, 34px); margin-bottom: 26px; }
h3 { font-size: 22px; margin: 40px 0 14px; }

p { margin: 0 0 30px; max-width: 62ch; }
p:last-child { margin-bottom: 0; }

.num {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--accent-2);
  display: block;
  margin-bottom: 10px;
}

.cap {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
  margin: 14px 0 0;
  max-width: 54ch;
}

.lead {
  font-size: 20px;
  line-height: 1.85;
}

ul, ol { margin: 0 0 30px; padding-left: 22px; max-width: 62ch; }
li { margin-bottom: 12px; }
li::marker { color: var(--accent); }

.plain { list-style: none; padding-left: 0; }
.plain li { border-top: 1px solid rgba(60, 106, 134, .35); padding-top: 12px; }

dl { margin: 0 0 30px; max-width: 62ch; }
dt { font-family: var(--serif); font-size: 20px; margin-top: 26px; }
dd { margin: 6px 0 0; }

/* ---------- cabeçalho em camadas ---------- */

.layer-nav { background: var(--stone-2); }

.layer-nav .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px var(--pad-h);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px 34px;
}

.wordmark {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: .02em;
}
.wordmark:hover { text-decoration: underline; text-underline-offset: 5px; }

.layer-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 0;
  padding: 0;
  max-width: none;
}
.layer-nav li { margin: 0; }
.layer-nav li a { font-size: 16px; text-decoration: none; color: var(--text); border-bottom: 2px solid transparent; padding-bottom: 2px; }
.layer-nav li a:hover { border-bottom-color: var(--accent); }

.layer-title {
  background: var(--stone-1);
}
.layer-title .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 150px var(--pad-h) 56px;
  display: flex;
  align-items: flex-end;
  min-height: 42vh;
}
.layer-title h1 { max-width: 20ch; }

.layer-base { background: var(--stone-3); }
.layer-base .grid { padding-top: 56px; }
.layer-base > .grid > .intro { grid-column: 1 / span 6; }
.layer-base > .grid > .topics { grid-column: 8 / span 5; }
.layer-base .topics h2 { font-size: 17px; font-family: var(--sans); color: var(--accent-2); margin-bottom: 16px; }
.layer-base .topics ul { list-style: none; padding: 0; margin: 0; }
.layer-base .topics li {
  border-top: 1px solid rgba(60, 106, 134, .4);
  padding: 10px 0;
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
}

/* cabeçalho curto das páginas interiores */
.layer-title.short .inner { padding: 96px var(--pad-h) 46px; min-height: 0; }

/* ---------- imagens ---------- */

.figure-main { padding-top: 0; }
.figure-main > .grid > figure { grid-column: 4 / span 9; margin: 0; }

.dark-block > .grid > .text { grid-column: 1 / span 6; }
.dark-block > .grid > figure { grid-column: 8 / span 5; margin: 0; }

/* ---------- índice de conteúdos ---------- */

.index-list { list-style: none; padding: 0; margin: 0; max-width: none; }
.index-list li {
  border-top: 1px solid rgba(60, 106, 134, .45);
  padding: 14px 0;
  margin: 0;
  display: flex;
  gap: 18px;
  align-items: baseline;
}
.index-list .n { font-family: var(--serif); color: var(--accent-2); font-size: 15px; min-width: 2.2em; }
.index-list a { text-decoration: none; border-bottom: 1px solid rgba(176, 42, 36, .5); }
.index-list a:hover { border-bottom-width: 2px; }

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

.contact-mail {
  font-family: var(--serif);
  font-size: clamp(22px, 3vw, 30px);
}

/* ---------- rodapé ---------- */

.site-footer {
  background: var(--ink-dark);
  color: var(--text-inv);
  margin-top: 0;
}

.site-footer .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px var(--pad-h) 56px;
}

.footer-name {
  font-family: var(--serif);
  font-size: clamp(46px, 11vw, 132px);
  line-height: 1.05;
  margin: 0 0 54px;
  letter-spacing: -.01em;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 28px;
  row-gap: 36px;
}

.footer-cols h2 {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--text-inv-soft);
  margin: 0 0 14px;
  padding-top: 14px;
  border-top: 2px solid var(--accent-2);
}

.footer-cols ul { list-style: none; padding: 0; margin: 0; }
.footer-cols li { margin-bottom: 10px; font-size: 16px; }
.footer-cols a { color: var(--text-inv); text-decoration: none; border-bottom: 1px solid rgba(176, 42, 36, .9); padding-bottom: 2px; }
.footer-cols a:hover { border-bottom-width: 2px; }
.footer-cols p { font-size: 16px; color: var(--text-inv-soft); margin: 0; max-width: 40ch; }

/* ---------- adaptação ---------- */

@media (max-width: 1080px) {
  :root { --pad-v: 64px; --pad-h: 36px; }
  .layer-base > .grid > .intro { grid-column: 1 / span 7; }
  .layer-base > .grid > .topics { grid-column: 9 / span 4; }
  .figure-main > .grid > figure { grid-column: 3 / span 10; }
}

@media (max-width: 860px) {
  :root { --pad-v: 48px; --pad-h: 22px; }
  body { font-size: 17px; line-height: 1.8; }
  .grid { grid-template-columns: 1fr; column-gap: 0; row-gap: 40px; }
  .s0 > .grid > *, .s1 > .grid > *, .s2 > .grid > *, .s3 > .grid > *,
  .layer-base > .grid > .intro, .layer-base > .grid > .topics,
  .figure-main > .grid > figure,
  .dark-block > .grid > .text, .dark-block > .grid > figure { grid-column: 1 / -1; }
  .layer-title .inner { padding: 64px var(--pad-h) 40px; min-height: 0; }
  .layer-title.short .inner { padding: 52px var(--pad-h) 32px; }
  .layer-nav .inner { padding: 16px var(--pad-h); gap: 10px 20px; }
  .layer-nav ul { gap: 6px 18px; }
  .footer-cols { grid-template-columns: 1fr; }
  .footer-name { margin-bottom: 38px; }
  p, ul, ol, dl, .cap { max-width: none; }
}