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

body {
  min-height: 100vh;
  font-family: 'Poppins', 'Trebuchet MS', Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px 20px;
  background: #f5f5f5;
}

#topo {
  width: 100%;
  height: 50px;
  position: fixed;
  top: 0; left: 0;
  background: linear-gradient(to right, #c0392b 47%, #7a4951 73%, #114455 87%);
  display: flex;
  align-items: center;
  z-index: 10;
}

#textotop {
  padding-left: 20px;
  font-size: clamp(22px, 5vw, 38px);
  color: #fff;
}

#log {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mens { text-align: center; color: #1f2937; }

.campo { display: flex; flex-direction: column; gap: 8px; }
label { font-weight: 700; color: #1f2937; }

input[type="email"], input[type="password"] {
  height: 46px;
  width: 100%;
  padding: 10px;
  font-size: 16px;
  border: 1px solid #c7c7c7;
  border-radius: 6px;
  font-family: inherit;
}

form { display: flex; flex-direction: column; gap: 16px; }

#logbtn {
  align-self: center;
  width: 50%;
  padding: 12px;
  font-size: 18px;
  font-weight: bold;
  background-color: #c0392b;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

#logbtn:hover { background-color: #a03224; }
#logbtn:disabled { background-color: #ccc; cursor: not-allowed; }

a { color: #111; text-decoration: none; }
a:hover { text-decoration: underline; }

#mensagem-erro {
  background: #fee2e2;
  border: 1px solid #fca5a5;
  color: #b91c1c;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 14px;
  display: none;
}

.theme-toggle-btn {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.2s;
  padding: 4px;
}
.theme-toggle-btn:hover { background: rgba(255,255,255,0.3); transform: translateY(-50%) scale(1.1); }
.theme-icon { width: 100%; height: 100%; object-fit: contain; }

[data-theme="dark"] body {
  background: #121212;
  color: #e8e8e8;
}

[data-theme="dark"] .mens { color: #e8e8e8; }
[data-theme="dark"] label { color: #e8e8e8; }

[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="password"] {
  background: #1a1a1a;
  border-color: #333;
  color: #e8e8e8;
}

[data-theme="dark"] #mensagem-erro {
  background: rgba(254,226,226,0.1);
  border-color: rgba(252,165,165,0.2);
  color: #fca5a5;
}

[data-theme="dark"] a { color: #e8e8e8; }