/* AulaZen — design system compartilhado (tokens de cor, tema claro/escuro,
   navegação, menu do usuário). As páginas usam as variáveis abaixo. */

:root {
  --bg: #e9eef9;
  --surface: #ffffff;
  --surface-2: #dde4f2;
  --text: #182033;
  --muted: #5b6880;
  --border: #cfd8ea;
  --primary: #2563eb;
  --primary-forte: #1d4ed8;
  --primary-contraste: #ffffff;
  --chip: #dde8ff;
  --chip-texto: #1d4ed8;
  --header: linear-gradient(120deg, #14286b 0%, #1d4ed8 60%, #3b82f6 100%);
  --sombra: 0 1px 4px rgba(23, 37, 84, 0.10);
  --sombra-alta: 0 8px 24px rgba(23, 37, 84, 0.16);
  --ok: #2e7d32; /* verde só como cor semântica de "resposta correta" */
}

html[data-tema="escuro"] {
  --bg: #0d1117;
  --surface: #161d29;
  --surface-2: #1f2836;
  --text: #e5eaf4;
  --muted: #92a0b8;
  --border: #2b3649;
  --primary: #5b8cff;
  --primary-forte: #8fb0ff;
  --primary-contraste: #0a1226;
  --chip: #1a2c55;
  --chip-texto: #a9c2ff;
  --header: linear-gradient(120deg, #0a1024 0%, #101c3f 70%, #16295e 100%);
  --sombra: 0 1px 4px rgba(0, 0, 0, 0.45);
  --sombra-alta: 0 8px 24px rgba(0, 0, 0, 0.55);
  --ok: #7bd88f;
}

html { color-scheme: light; }
html[data-tema="escuro"] { color-scheme: dark; }

body {
  /* textura: brilhos suaves de cor + grade de pontos sutil sobre o fundo */
  background:
    radial-gradient(1100px 500px at 85% -10%, color-mix(in srgb, var(--primary) 9%, transparent), transparent 60%),
    radial-gradient(900px 420px at -10% 30%, color-mix(in srgb, var(--primary) 6%, transparent), transparent 55%),
    radial-gradient(color-mix(in srgb, var(--text) 7%, transparent) 1px, transparent 1px) 0 0 / 26px 26px,
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
  transition: background 0.25s ease, color 0.25s ease;
}

/* ---------- barra do topo ---------- */
nav.topo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px 16px;
}

nav.topo a, nav.topo button.tema-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--primary-forte);
  text-decoration: none;
  font-size: 14px;
  box-shadow: var(--sombra);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s ease, transform 0.1s ease;
}

nav.topo a:hover, nav.topo button.tema-btn:hover {
  background: var(--chip);
  transform: translateY(-1px);
}

nav.topo a.casa, nav.topo button.tema-btn {
  padding: 7px 11px;
  font-size: 16px;
  line-height: 1;
}

nav.topo button.tema-btn { margin-left: auto; }

/* variante pra fundos escuros fixos (lousa do quiz) */
nav.topo.escuro a { background: transparent; border-color: #f4f1e855; color: #f4f1e8; box-shadow: none; }
nav.topo.escuro a:hover { background: #ffffff22; }

/* ---------- menu suspenso do usuário (header da home) ---------- */
details.menu-usuario { position: relative; }

details.menu-usuario > summary {
  list-style: none;
  cursor: pointer;
  color: #fff;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid #ffffff55;
  user-select: none;
}
details.menu-usuario > summary::-webkit-details-marker { display: none; }
details.menu-usuario > summary::after { content: " ▾"; font-size: 11px; opacity: 0.8; }
details.menu-usuario[open] > summary, details.menu-usuario > summary:hover { background: #ffffff22; }

details.menu-usuario .menu-itens {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 200px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--sombra-alta);
  padding: 6px;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

details.menu-usuario .menu-itens a,
details.menu-usuario .menu-itens button {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: none;
  background: none;
  border-radius: 7px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
}

details.menu-usuario .menu-itens a:hover,
details.menu-usuario .menu-itens button:hover { background: var(--surface-2); }

details.menu-usuario .menu-itens .separador {
  border-top: 1px solid var(--border);
  margin: 5px 8px;
}

/* ---------- dropdown-conta (assinatura + dados + alterar) ---------- */
.conta-menu { min-width: 288px; padding: 16px !important; border-radius: 14px !important; }

.conta-menu .bloco-assinatura .rotulo {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 2.2px;
  font-weight: 700; color: var(--muted); margin-bottom: 8px;
}
.conta-menu .selo {
  display: inline-block; padding: 5px 14px; border-radius: 999px;
  font-size: 13.5px; font-weight: 700; letter-spacing: 0.2px;
  background: var(--chip); color: var(--chip-texto);
}
.conta-menu .bloco-assinatura p {
  margin: 8px 0 2px; font-size: 12.5px; line-height: 1.5; color: var(--muted);
}

.conta-menu .bloco-dados { display: flex; flex-direction: column; gap: 3px; padding: 6px 2px; }
.conta-menu .bloco-dados strong {
  font-size: 15.5px; font-weight: 650; letter-spacing: 0.1px;
}
.conta-menu .bloco-dados span { font-size: 13px; color: var(--muted); letter-spacing: 0.1px; }
.conta-menu .bloco-dados a#abrir-alterar {
  align-self: flex-end; font-size: 11.5px; color: #c0392b;
  text-decoration: underline; cursor: pointer; padding: 2px;
}

.conta-menu form#form-alterar { display: flex; flex-direction: column; gap: 7px; padding: 8px 2px 4px; }
.conta-menu form#form-alterar input { width: 100%; padding: 8px 10px; font-size: 13px; }
.conta-menu form#form-alterar button {
  padding: 8px; border: none; border-radius: 7px; font-weight: 600; cursor: pointer;
  background: var(--primary); color: var(--primary-contraste);
}
.conta-menu #alt-msg { min-height: 14px; font-size: 12px; }
.conta-menu #alt-msg.erro { color: #c0392b; }
.conta-menu #alt-msg.ok { color: var(--primary-forte); }

.conta-menu button.sair {
  justify-content: center !important;
  text-align: center !important;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--muted) !important;
}

/* ---------- imagens de questão ---------- */
img.q-img {
  display: block;
  max-width: 100%;
  max-height: 320px;
  border-radius: 8px;
  margin: 8px 0;
  background: #fff; /* PNG transparente precisa de fundo claro em qualquer tema */
}

/* ---------- rodapé ---------- */
footer.rodape {
  text-align: center;
  font-size: 11.5px;
  color: var(--muted);
  padding: 26px 16px 18px;
  letter-spacing: 0.4px;
}

a.sac-whats {
  position: fixed;
  right: 14px;
  bottom: 14px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--primary-forte);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  text-decoration: none;
  box-shadow: var(--sombra-alta);
  z-index: 40;
}
a.sac-whats:hover { background: var(--chip); }
@media print { footer.rodape, a.sac-whats { display: none; } }

/* ---------- polimentos globais ---------- */
::selection { background: var(--chip); }
button { font-family: inherit; }
input, select, textarea {
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
}
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}