:root {
  --bg-principal: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --texto-principal: #f8fafc;
  --texto-secundario: #94a3b8;
  --primaria: #10b981;
  --primaria-hover: #059669;
  --secundaria: #38bdf8;
  --perigo: #ef4444;
  --perigo-hover: #dc2626;
  --borda: #475569;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-principal);
  color: var(--texto-principal);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 1.5rem 1rem;
}

.container {
  width: 100%;
  max-width: 520px;
  background-color: var(--bg-card);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--borda);
}

.header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.badge {
  display: inline-block;
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--primaria);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 0.5rem;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.header h1 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--texto-principal);
}

.subtitle {
  font-size: 0.9rem;
  color: var(--texto-secundario);
  margin-top: 0.25rem;
}

/* Abas */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background-color: var(--bg-principal);
  padding: 0.35rem;
  border-radius: 10px;
  margin-bottom: 1.5rem;
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--texto-secundario);
  padding: 0.6rem 0.5rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background-color: var(--bg-card);
  color: var(--texto-principal);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Conteúdo das Abas */
.conteudo-aba {
  display: none;
}

.conteudo-aba.ativo {
  display: block;
}

h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.instrucoes {
  font-size: 0.85rem;
  color: var(--texto-secundario);
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

/* Formulários */
.campo, .campo-admin {
  margin-bottom: 1.1rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--texto-principal);
}

select, input[type="text"], input[type="password"] {
  width: 100%;
  padding: 0.8rem 1rem;
  background-color: var(--bg-input);
  border: 1px solid var(--borda);
  border-radius: 8px;
  color: var(--texto-principal);
  font-size: 1rem;
  outline: none;