@charset "UTF-8";
/* ============================================================
   Física 12.º ano — Colégio de São Tomás
   Folha de estilo unificada.

   O sistema de cores, tipos e formas é extraído da página
   «História dos Modelos Atómicos» (fundo nocturno, ouro velho,
   serifas editoriais, filetes de 1px) e cruzado com a gramática
   das apresentações Keynote (numeração 00–14, retrato do autor
   com as datas de vida a ouro no canto inferior direito).
   ============================================================ */

:root {
  --bg:         #0a0a12;
  --bg-raise:   rgba(255,255,255,0.03);
  --bg-raise-2: rgba(255,255,255,0.055);
  --gold:       #c9a84c;
  --gold-light: #e8cc80;
  --gold-dim:   rgba(201,168,76,0.20);
  --gold-hair:  rgba(201,168,76,0.10);
  --cream:      #f0ead8;
  --text:       #c8c0b0;
  --dim:        #6b6b80;
  --accent:     #4a7fa5;
  --rubro:      #c05050;
  --ink:        #0a0a12;

  --display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --body:    'Crimson Pro', Georgia, 'Times New Roman', serif;
  --mono:    ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wide:  1180px;
  --read:  760px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--cream);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Campo de estrelas — o fundo da página dos modelos atómicos. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 15% 20%, rgba(255,255,255,0.15) 0%, transparent 100%),
    radial-gradient(1px 1px at 45% 75%, rgba(255,255,255,0.10) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 35%, rgba(255,255,255,0.12) 0%, transparent 100%),
    radial-gradient(1px 1px at 65% 10%, rgba(255,255,255,0.08) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 55%, rgba(255,255,255,0.10) 0%, transparent 100%),
    radial-gradient(1px 1px at 92% 68%, rgba(255,255,255,0.09) 0%, transparent 100%),
    radial-gradient(1px 1px at 8%  88%, rgba(255,255,255,0.07) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

.site-nav, .site-header, main, .site-footer { position: relative; z-index: 1; }

/* ─────────────────────────  Navegação  ───────────────────────── */

.site-nav {
  border-bottom: 1px solid var(--gold-hair);
  background: rgba(10,10,18,0.86);
  backdrop-filter: saturate(140%) blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-nav .inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  margin-right: auto;
}

.brand img { width: 26px; height: auto; display: block; opacity: 0.9; }

.brand span {
  font-family: var(--display);
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-light);
}

.site-nav a.item {
  font-family: var(--display);
  font-size: 0.74rem;
  letter-spacing: 0.17em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  padding: 0.28rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.25s, border-color 0.25s;
  white-space: nowrap;
}

.site-nav a.item:hover { color: var(--gold-light); border-bottom-color: var(--gold-dim); }
.site-nav a.item[aria-current="page"] { color: var(--gold); border-bottom-color: var(--gold); }

/* ─────────────────────────  Cabeçalho  ───────────────────────── */

.site-header {
  text-align: center;
  padding: 3.6rem 1.5rem 1.2rem;
  max-width: var(--wide);
  margin: 0 auto;
}

.site-header .kicker {
  font-family: var(--display);
  font-size: 0.74rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.9rem;
}

.site-header h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2rem, 5vw, 3.4rem);
  color: var(--gold-light);
  letter-spacing: 0.04em;
  line-height: 1.15;
}

.site-header h1 em {
  font-style: italic;
  color: var(--cream);
  font-size: 0.44em;
  display: block;
  font-weight: 400;
  letter-spacing: 0.1em;
  margin-top: 0.7rem;
}

.site-header::after {
  content: '';
  display: block;
  width: 220px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin: 1.4rem auto 0;
}

.site-header p.lead {
  max-width: var(--read);
  margin: 1.5rem auto 0;
  color: var(--text);
  font-size: 1.05rem;
}

/* ─────────────────────────  Estrutura  ───────────────────────── */

main { max-width: var(--wide); margin: 0 auto; padding: 1.5rem 1.5rem 3rem; }
main.narrow { max-width: calc(var(--read) + 3rem); }

section.bloco { margin: 3.2rem 0 0; }

h2.tema {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.55rem;
  color: var(--gold-light);
  letter-spacing: 0.03em;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--gold-dim);
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  flex-wrap: wrap;
}

h2.tema .conta {
  font-family: var(--body);
  font-size: 0.85rem;
  color: var(--dim);
  font-style: italic;
  letter-spacing: 0;
}

h3.subtema {
  font-family: var(--display);
  font-weight: 400;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 2.2rem 0 1rem;
}

p.nota {
  color: var(--text);
  max-width: var(--read);
  margin: 0.9rem 0 0;
  font-size: 0.98rem;
}

p.nota + p.nota { margin-top: 0.7rem; }

main a { color: var(--gold-light); text-decoration-color: var(--gold-dim); text-underline-offset: 3px; }
main a:hover { color: var(--cream); }

/* ─────────────────  Cartões de aula (com viragem)  ───────────── */

.grelha {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.3rem;
  margin-top: 1.2rem;
}

.aula {
  background: var(--bg-raise);
  border: 1px solid var(--gold-dim);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
  outline: none;
  transition: border-color 0.3s;
}

/* A revelação só existe se o JavaScript correr: é ele que põe .reveal-on
   no <body>. Sem JavaScript, os cartões aparecem logo, opacos.          */
.reveal-on .aula {
  opacity: 0;
  transform: translateY(24px);
  transition: border-color 0.3s, transform 0.6s ease, opacity 0.6s ease;
}
.reveal-on .aula.visible { opacity: 1; transform: translateY(0); }
.aula:hover, .aula:focus-within, .aula:focus { border-color: var(--gold); }
.aula:focus-visible { box-shadow: 0 0 0 2px rgba(201,168,76,0.35); }

/* A frente fica no fluxo normal: é ela que dá a altura ao cartão, e assim
   nenhuma descrição longa fica cortada. Só o verso é sobreposto.        */
.aula .camada { transition: opacity 0.28s ease; backface-visibility: hidden; }

.aula .frente {
  position: relative;
  padding: 1.5rem 1.6rem;
  min-height: 246px;
  opacity: 1;
  display: flex;
  flex-direction: column;
}

.aula .verso {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  padding: 0;
}

.aula:hover .frente, .aula:focus-within .frente, .aula:focus .frente { opacity: 0; }
.aula:hover .verso,  .aula:focus-within .verso,  .aula:focus .verso  { opacity: 1; }

.aula .num {
  font-family: var(--display);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.aula .titulo {
  font-family: var(--display);
  font-size: 1.18rem;
  line-height: 1.3;
  color: var(--cream);
  margin-bottom: 0.4rem;
}

.aula .dominio {
  font-size: 0.85rem;
  color: var(--dim);
  font-style: italic;
  margin-bottom: 0.75rem;
}

.aula .desc { font-size: 0.94rem; line-height: 1.6; color: var(--text); }

.aula .formatos {
  margin-top: auto;
  padding-top: 0.9rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.aula .verso figure { position: absolute; inset: 0; margin: 0; }

.aula .verso img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
  filter: contrast(1.02);
}

.aula .verso .veu {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(10,10,18,0.10), rgba(10,10,18,0.55)),
    radial-gradient(60% 80% at 50% 20%, rgba(201,168,76,0.14), transparent 62%);
  pointer-events: none;
}

.aula .verso figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 0.8rem 1rem 0.85rem;
  font-size: 0.88rem;
  color: rgba(240,234,216,0.94);
  background: linear-gradient(180deg, transparent, rgba(10,10,18,0.82));
}

.aula .verso figcaption span {
  display: block;
  color: rgba(201,168,76,0.94);
  font-family: var(--display);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.68rem;
  margin-bottom: 0.15rem;
}

/* ────────────────────  Etiquetas de formato  ─────────────────── */

.fmt {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--display);
  font-size: 0.66rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.3rem 0.62rem;
  border: 1px solid var(--gold-dim);
  border-radius: 2px;
  color: var(--gold-light);
  text-decoration: none;
  background: rgba(201,168,76,0.05);
  transition: background 0.25s, border-color 0.25s, color 0.25s;
  white-space: nowrap;
}

.fmt:hover { background: rgba(201,168,76,0.16); border-color: var(--gold); color: var(--cream); }
.fmt.vazio { opacity: 0.32; pointer-events: none; }
.fmt.pagina { border-color: rgba(74,127,165,0.45); background: rgba(74,127,165,0.10); color: #a8cbe4; }
.fmt.pagina:hover { background: rgba(74,127,165,0.24); border-color: var(--accent); }

/* ─────────────────────  Listas de materiais  ─────────────────── */

.lista { list-style: none; margin-top: 0.9rem; }

.lista > li {
  border-bottom: 1px solid var(--gold-hair);
  padding: 0.85rem 0;
  display: flex;
  gap: 1.1rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.lista > li:last-child { border-bottom: none; }

.lista .rotulo { flex: 1 1 320px; min-width: 0; }

.lista .rotulo strong {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.03rem;
  color: var(--cream);
  display: block;
}

.lista .rotulo em {
  display: block;
  font-size: 0.88rem;
  color: var(--dim);
  font-style: italic;
  margin-top: 0.12rem;
}

.lista .acoes { display: flex; gap: 0.45rem; flex-wrap: wrap; }

/* Par «sem respostas» / «com respostas» */
.par { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.fmt.chave { border-color: rgba(192,80,80,0.45); background: rgba(192,80,80,0.10); color: #e0a0a0; }
.fmt.chave:hover { background: rgba(192,80,80,0.22); border-color: var(--rubro); color: var(--cream); }

/* ────────────────────────  Caixa de aviso  ───────────────────── */

.caixa {
  border: 1px solid var(--gold-dim);
  border-left: 2px solid var(--gold);
  background: var(--bg-raise);
  padding: 1.1rem 1.3rem;
  margin: 1.6rem 0 0;
  font-size: 0.95rem;
  color: var(--text);
  max-width: var(--read);
}

.caixa strong { color: var(--gold-light); font-family: var(--display); font-weight: 400; }

/* ─────────────────────  Pórtico (página inicial)  ────────────── */

.porticos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.3rem;
  margin-top: 2rem;
}

a.portico {
  display: block;
  text-decoration: none;
  border: 1px solid var(--gold-dim);
  background: var(--bg-raise);
  padding: 1.6rem 1.7rem 1.5rem;
  border-radius: 2px;
  transition: border-color 0.3s, background 0.3s;
}

.reveal-on a.portico {
  opacity: 0;
  transform: translateY(24px);
  transition: border-color 0.3s, background 0.3s, transform 0.6s ease, opacity 0.6s ease;
}
.reveal-on a.portico.visible { opacity: 1; transform: translateY(0); }
a.portico:hover { border-color: var(--gold); background: var(--bg-raise-2); }

a.portico .glifo { margin-bottom: 0.9rem; display: block; }
a.portico .glifo svg { width: 54px; height: 54px; overflow: visible; }

a.portico h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.32rem;
  color: var(--gold-light);
  letter-spacing: 0.02em;
  margin-bottom: 0.15rem;
}

a.portico .conta {
  font-family: var(--display);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  display: block;
  margin-bottom: 0.7rem;
}

a.portico p { font-size: 0.95rem; color: var(--text); line-height: 1.6; }

/* ─────────────────────────  Tabelas  ─────────────────────────── */

.envoltorio { overflow-x: auto; margin-top: 1.1rem; }

table.dados {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
  font-size: 0.94rem;
}

table.dados th {
  font-family: var(--display);
  font-weight: 400;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  text-align: left;
  padding: 0.6rem 0.9rem 0.6rem 0;
  border-bottom: 1px solid var(--gold-dim);
  white-space: nowrap;
}

table.dados td {
  padding: 0.7rem 0.9rem 0.7rem 0;
  border-bottom: 1px solid var(--gold-hair);
  color: var(--text);
  vertical-align: baseline;
}

table.dados td:first-child { color: var(--cream); }
table.dados tr:last-child td { border-bottom: none; }

/* ─────────────────────  Vídeo e figuras  ─────────────────────── */

figure.fig { margin: 1.6rem 0 0; }
figure.fig video, figure.fig img { width: 100%; display: block; border: 1px solid var(--gold-dim); }
figure.fig figcaption { font-size: 0.88rem; color: var(--dim); font-style: italic; margin-top: 0.5rem; }

/* ─────────────────────────  Rodapé  ──────────────────────────── */

.site-footer {
  text-align: center;
  padding: 2.4rem 1.5rem 3rem;
  color: var(--dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--gold-hair);
  margin-top: 3.5rem;
}

.site-footer .datas {
  font-family: var(--display);
  letter-spacing: 0.2em;
  color: var(--gold);
  font-size: 0.72rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.site-footer a { color: var(--text); text-decoration-color: var(--gold-hair); }
.site-footer a:hover { color: var(--gold-light); }

/* ─────────────────────────  Reduzido  ────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .aula, a.portico { opacity: 1 !important; transform: none !important; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .site-nav .inner { gap: 0.9rem; padding: 0.6rem 1rem; }
  .site-nav a.item { font-size: 0.68rem; letter-spacing: 0.12em; }
  main { padding: 1rem 1rem 2rem; }
  .lista > li { flex-direction: column; gap: 0.6rem; }
}