/* ============================================================
   MATÉRIA EDUCATIVA — 02 · CABEÇALHO
   Navegação, menu mobile, busca, logo animado e tema.
   ============================================================ */

/* -------------------- BARRA DE PROGRESSO -------------------- */
.barra-progresso {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  z-index: 200;
  background: var(--grad-acento);
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
  transition: transform var(--t-media);
}

/* -------------------- HEADER / TOPO -------------------- */
.topo {
  top: 0;
  z-index: 100;
  background: var(--vidro);
  backdrop-filter: blur(14px) saturate(1.6);
  -webkit-backdrop-filter: blur(14px) saturate(1.6);
  border-bottom: 1px solid var(--linha);
  transition: box-shadow var(--t-rapida);
}

.topo-rolado {
  box-shadow: var(--sombra-1);
}

.topo-linha {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--esp-4);
  min-height: 72px;
  transition: min-height var(--t-rapida);
}

.topo-rolado .topo-linha {
  min-height: 64px;
}

/* -------------------- MARCA (LOGO + NOME) -------------------- */
.marca {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: transform var(--t-media);
  flex-shrink: 0;
}

.marca:hover {
  transform: scale(1.06) rotate(-3deg);
}

.marca-logo {
  width: 42px;
  height: 42px;
  border-radius: var(--raio-p);
  box-shadow: var(--sombra-1);
  display: block;
  object-fit: cover;
}

.marca-texto {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
}

.marca-nome {
  font-size: var(--t-base);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin: 0;
  /* Fallback antes do gradiente */
  color: var(--marca);
  /* Gradiente de texto */
  background-image: var(--grad-marca);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.marca-slogan {
  font-size: var(--t-xs);
  color: var(--texto-suave);
  font-weight: 400;
  line-height: 1.1;
}

/* -------------------- BUSCA NO TOPO -------------------- */
.busca-topo {
  display: flex;
  align-items: center;
  flex: 0 1 280px;
  gap: 0;
  border: 1px solid var(--linha-forte);
  border-radius: var(--raio-pill);
  background: var(--fundo);
  padding: 0;
  transition: border-color var(--t-rapida), box-shadow var(--t-rapida);
}

.busca-topo:focus-within {
  border-color: var(--link);
  box-shadow: var(--sombra-foco);
}

.busca-topo input[type="search"] {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--texto);
  padding: 11px 16px;
  font-size: var(--t-sm);
  font-family: var(--fonte-ui);
}

.busca-topo input[type="search"]::placeholder {
  color: var(--texto-suave);
  opacity: 0.8;
}

.busca-topo input[type="search"]:focus {
  outline: none;
}

.busca-topo button {
  border: none;
  background: var(--grad-marca);
  color: var(--sobre-grad);
  padding: 8px 18px;
  margin: 4px;
  border-radius: var(--raio-m);
  font-size: var(--t-sm);
  font-weight: 600;
  cursor: pointer;
  font-family: var(--fonte-ui);
  transition: filter var(--t-rapida);
}

.busca-topo button:hover {
  filter: saturate(1.12) brightness(1.08);
}

/* -------------------- NAVEGAÇÃO DESKTOP -------------------- */
.topo-faixa {
  border-top: 1px solid var(--linha);
  background: color-mix(in srgb, var(--fundo) 50%, transparent);
}

.nav-desktop ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-desktop li {
  margin: 0;
  padding: 0;
}

.nav-desktop a {
  display: inline-flex;
  align-items: center;
  padding: 14px 18px;
  color: var(--texto);
  text-decoration: none;
  font-size: var(--t-sm);
  font-weight: 600;
  position: relative;
  transition: color var(--t-rapida);
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  bottom: 10px;
  left: 50%;
  right: 50%;
  height: 2px;
  background: var(--grad-acento);
  transition: left var(--t-media), right var(--t-media);
}

.nav-desktop a:hover,
.nav-desktop a.ativo {
  color: var(--link);
}

.nav-desktop a:hover::after,
.nav-desktop a.ativo::after {
  left: 18px;
  right: 18px;
}

/* -------------------- BOTÃO MENU (MOBILE) -------------------- */
.botao-menu {
  display: none;
  align-items: center;
  justify-content: center;
  width: auto;
  height: 40px;
  padding: 0 16px;
  border: 1px solid var(--linha-forte);
  border-radius: var(--raio-pill);
  background: var(--fundo);
  color: var(--texto);
  font-size: var(--t-sm);
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--t-rapida), background-color var(--t-rapida), color var(--t-rapida);
}

.botao-menu:hover {
  border-color: var(--link);
  background: var(--tinta-link-10);
  color: var(--link);
}

/* -------------------- TOGGLE CHECKBOX (OCULTO) -------------------- */
.menu-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  left: -9999px;
}

/* -------------------- MENU LATERAL (MOBILE) -------------------- */
.menu-fundo {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--veu);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 99;
  animation: revelar-fundo var(--t-lenta);
}

@keyframes revelar-fundo {
  from { background: transparent; }
  to { background: var(--veu); }
}

.menu-toggle:checked ~ .menu-fundo {
  display: block;
}

.menu-lateral {
  position: fixed;
  top: 0;
  right: 0;
  width: min(340px, 88vw);
  height: 100vh;
  background: var(--fundo);
  border-radius: var(--raio-g) 0 0 var(--raio-g);
  box-shadow: var(--sombra-3);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transform: translateX(102%);
  visibility: hidden;
  transition: transform var(--t-lenta), visibility var(--t-lenta);
  overflow-y: auto;
  overflow-x: hidden;
}

.menu-toggle:checked ~ .menu-lateral {
  transform: translateX(0);
  visibility: visible;
}

.menu-lateral-topo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--esp-4) var(--esp-5);
  border-bottom: 1px solid var(--linha);
  flex-shrink: 0;
  gap: var(--esp-3);
}

.menu-lateral-titulo {
  font-size: var(--t-sm);
  font-weight: 700;
  color: var(--marca);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.menu-lateral-secao {
  padding: var(--esp-5) var(--esp-5) var(--esp-3);
  margin: 0;
  border-top: 1px solid var(--linha);
  margin-top: var(--esp-4);
}

.menu-fechar {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  border: 1px solid var(--linha-forte);
  border-radius: var(--raio-p);
  background: transparent;
  color: var(--texto);
  cursor: pointer;
  font-size: var(--t-xs);
  font-weight: 700;
  transition: border-color var(--t-rapida), background-color var(--t-rapida);
}

.menu-fechar:hover {
  border-color: var(--link);
  background: var(--tinta-link-10);
  color: var(--link);
}

.menu-lateral nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.menu-lateral nav li {
  margin: 0;
  padding: 0;
}

.menu-lateral nav a {
  display: block;
  padding: 12px var(--esp-5);
  color: var(--texto);
  text-decoration: none;
  font-size: var(--t-sm);
  border-radius: var(--raio-p);
  transition: background-color var(--t-rapida), color var(--t-rapida), padding-left var(--t-rapida);
}

.menu-lateral nav a:hover,
.menu-lateral nav a.ativo {
  background: var(--tinta-link-10);
  color: var(--link);
  padding-left: calc(var(--esp-5) + 8px);
}

/* -------------------- BUSCA LATERAL (MOBILE) -------------------- */
.busca-lateral {
  display: flex;
  align-items: center;
  gap: 0;
  margin: var(--esp-4) var(--esp-4) var(--esp-5);
  border: 1px solid var(--linha-forte);
  border-radius: var(--raio-pill);
  background: var(--fundo-alt);
  padding: 0;
  transition: border-color var(--t-rapida), box-shadow var(--t-rapida);
}

.busca-lateral:focus-within {
  border-color: var(--link);
  box-shadow: var(--sombra-foco);
}

.busca-lateral input[type="search"] {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--texto);
  padding: 11px 14px;
  font-size: var(--t-sm);
  font-family: var(--fonte-ui);
}

.busca-lateral input[type="search"]::placeholder {
  color: var(--texto-suave);
  opacity: 0.8;
}

.busca-lateral input[type="search"]:focus {
  outline: none;
}

.busca-lateral button {
  border: none;
  background: var(--grad-marca);
  color: var(--sobre-grad);
  padding: 8px 14px;
  margin: 3px;
  border-radius: var(--raio-m);
  font-size: var(--t-xs);
  font-weight: 600;
  cursor: pointer;
  font-family: var(--fonte-ui);
  transition: filter var(--t-rapida);
}

.busca-lateral button:hover {
  filter: saturate(1.12) brightness(1.08);
}

/* -------------------- BOTÃO DE TEMA (CLARO/ESCURO) -------------------- */
.botao-tema {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--linha-forte);
  border-radius: var(--raio-pill);
  background: var(--fundo);
  color: var(--texto);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--t-rapida), background-color var(--t-rapida), transform var(--t-rapida);
}

.botao-tema:hover {
  border-color: var(--link);
  background: var(--tinta-link-10);
  transform: rotate(18deg);
}

.botao-tema .icone-sol {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: none;
}

.botao-tema .icone-lua {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: block;
}

/* Tema escuro: mostre o ícone do sol, esconda a lua */
:root[data-tema="escuro"] .botao-tema .icone-sol {
  display: block;
}

:root[data-tema="escuro"] .botao-tema .icone-lua {
  display: none;
}

/* Preferência de tema do sistema: escuro */
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="claro"]) .botao-tema .icone-sol {
    display: block;
  }

  :root:not([data-tema="claro"]) .botao-tema .icone-lua {
    display: none;
  }
}

/* -------------------- RESPONSIVIDADE -------------------- */

/* Até 1000px: esconder busca desktop e faixa de navegação */
@media (max-width: 1000px) {
  .busca-topo {
    display: none;
  }

  .topo-faixa {
    display: none;
  }

  .botao-menu {
    display: inline-flex;
  }
}

/* Até 700px: compactar header e esconder slogan */
@media (max-width: 700px) {
  .topo-linha {
    min-height: 62px;
    gap: 12px;
  }

  .topo-rolado .topo-linha {
    min-height: 56px;
  }

  .marca-logo {
    width: 36px;
    height: 36px;
  }

  .marca-nome {
    font-size: var(--t-sm);
  }

  .marca-slogan {
    display: none;
  }

  .botao-tema {
    width: 36px;
    height: 36px;
  }

  .botao-tema .icone-sol,
  .botao-tema .icone-lua {
    width: 16px;
    height: 16px;
  }
}

/* -------------------- AÇÕES DO TOPO (tema + menu) -------------------- */
.topo-acoes {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}